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what is convection does it need any medium for transfer of heat

by Ken Steuber Published 3 years ago Updated 3 years ago

Convection involves the bodily movement of the heated molecules. Convection is the process in which heat is transmitted from one place to other by the actual movement of heated particles. It is prominent in the case of liquids and gases.

Full Answer

What is convection and how it effects your heating costs?

New plan: $259 heating which is $20 less

  • Usage rate: $0.30/kWh
  • Winter power usage: 2.4kW (hourly power use) x 4 hours (daily use) x 90 days (days in winter) = 864kWh
  • Winter heating cost: 864kWh x $0.30/kWh = $259

How can heat leave a house through convection?

When evaluating the energy efficiency of any structure, keep the following essential concepts in mind:

  • Heat always moves from warmer areas to colder areas. In winter, we heat the interior of a home, so the direction of heat flow is from inside to outside. ...
  • The greater the temperature difference, the faster heat flows. ...
  • Air contains moisture vapor. ...

What must happen for heat to be transferred by Convenction?

The different modes of heat transfer are:

  • Conduction
  • Convection
  • Radiation

How does a thermos reduce heat transfer using convection?

The vacuum between the two walls prevents heat transfer through conduction or convection from the inside to the outside and reverse. Thermos also has a silver lining in the inner wall that prevents heat transfer through radiation as blocks any inner heat to go out through radiation.

What is medium in heat transfer?

A heat transfer medium in the most general sense may be present in the solid, liquid and/or vapor phase; it can be used to store heat in a reversible form and can be circulated within the installation, e.g., in pipes.

What is convection class 7th?

Convection: The process of heat transfer from one part of a fluid to another part by the actual movement of the particles of the fluid is called convection. Liquid and gases are heated by the process of convection. For example: In winter, the air over the ocean is hot as compared to that on the landmass.

What is convection does it need medium for transfer heat?

Convection uses the movement of fluids to transfer heat. Radiation does not require a medium for transferring heat; this mode uses the electromagnetic radiation emitted by an object for exchanging heat.

What is called convection?

Definition of convection 1 : the action or process of conveying. 2a : movement in a gas or liquid in which the warmer parts move up and the cooler parts move down convection currents. b : the transfer of heat by convection foods cooked by convection — compare conduction, radiation.

What is convection Class 9?

Convection is the process of heat transfer by the bulk movement of molecules within fluids such as gases and liquids. The initial heat transfer between the object and the fluid takes place through conduction, but the bulk heat transfer happens due to the motion of the fluid.

What is a convection medium?

The medium of heat transfer via convection would be fluids, such as gases and liquids. A fluid as a medium is necessary since they become less...

What is convection and conduction?

Conduction is the transfer of thermal energy through direct contact. Convection is the transfer of thermal energy through the movement of a liquid or gas.

What is convection process of heat transfer?

Convection. Convective heat transfer is the transfer of heat between two bodies by currents of moving gas or fluid. In free convection, air or water moves away from the heated body as the warm air or water rises and is replaced by a cooler parcel of air or water.

State heat definition

According to the heat definition, heat is a form of energy that can be transferred from one medium to another through various processes like conduc...

What is convection?

Convection is the process of heat transfer by the bulk movement of molecules within fluids such as gases and liquids.

On what factors the heat-transfer coefficient (h) depends upon?

The value of heat-transfer coefficient (h) depends on: Density Viscosity Thermal conductivity Specific heat capacity

What are the types of convection?

Types of convection are: Natural convection Forced convection

1. Give some examples of convection heat transfer

Some of the major convection heat transfer example is:Heat transfer due to convection occurs both naturally and artificially. The most common natur...

2. What are the types of convection?

Ans Types of ConvectionThe two types of convection are:● Natural convection● Forced convectionNatural convection: When convection occurs due to the...

3. What is the method of convection heat transfer?

Convection is a type of heat transfer between a solid surface and a liquid or gas in motion. The convection of heat is done by the compound effects...

How does convection work?

Convection can be "forced" by movement of a fluid by means other than buoyancy forces (for example, a water pump in an automobile engine). Thermal expansion of fluids may also force convection. In other cases, natural buoyancy forces alone are entirely responsible for fluid motion when the fluid is heated, and this process is called "natural convection". An example is the draft in a chimney or around any fire. In natural convection, an increase in temperature produces a reduction in density, which in turn causes fluid motion due to pressures and forces when fluids of different densities are affected by gravity (or any g-force ). For example, when water is heated on a stove, hot water from the bottom of the pan is displaced (or forced up) by the colder denser liquid, which falls. After heating has stopped, mixing and conduction from this natural convection eventually result in a nearly homogeneous density, and even temperature. Without the presence of gravity (or conditions that cause a g-force of any type), natural convection does not occur, and only forced-convection modes operate.

What are the two types of convective heat transfer?

Two types of convective heat transfer may be distinguished: 1 Free or natural convection: when fluid motion is caused by buoyancy forces that result from the density variations due to variations of thermal ±temperature in the fluid. In the absence of an internal source, when the fluid is in contact with a hot surface, its molecules separate and scatter, causing the fluid to be less dense. As a consequence, the fluid is displaced while the cooler fluid gets denser and the fluid sinks. Thus, the hotter volume transfers heat towards the cooler volume of that fluid. Familiar examples are the upward flow of air due to a fire or hot object and the circulation of water in a pot that is heated from below. 2 Forced convection: when a fluid is forced to flow over the surface by an internal source such as fans, by stirring, and pumps, creating an artificially induced convection current.

What is the process of heat transfer?

Convection (or convective heat transfer) is the transfer of heat from one place to another due to the movement of fluid. Although often discussed as a distinct method of heat transfer, convective heat transfer involves the combined processes of conduction (heat diffusion) and advection (heat transfer by bulk fluid flow ). Convection is usually the dominant form of heat transfer in liquids and gases.

What causes fluid to move?

Free or natural convection: when fluid motion is caused by buoyancy forces that result from the density variations due to variations of thermal ±temperature in the fluid. In the absence of an internal source, when the fluid is in contact with a hot surface, its molecules separate and scatter, causing the fluid to be less dense. As a consequence, the fluid is displaced while the cooler fluid gets denser and the fluid sinks. Thus, the hotter volume transfers heat towards the cooler volume of that fluid. Familiar examples are the upward flow of air due to a fire or hot object and the circulation of water in a pot that is heated from below.

What is the dominant form of heat transfer in liquids and gases?

Convection is usually the dominant form of heat transfer in liquids and gases. Note that this definition of convection is only applicable in Heat transfer and thermodynamic contexts.

Why is heat transfer a cumulative transport?

Because the molecules in aggregate retain their random motion, the total heat transfer is then due to the superposition of energy transport by random motion of the molecules and by the bulk motion of the fluid. It is customary to use the term convection when referring to this cumulative transport and the term advection when referring to ...

What happens when water is heated on a stove?

For example, when water is heated on a stove, hot water from the bottom of the pan rises, displacing the colder denser liquid, which falls. After heating has stopped, mixing and conduction from this natural convection eventually result in a nearly homogeneous density, and even temperature.

What is the process of heat transfer?

Convection is the process of heat transfer by the bulk movement of molecules within fluids such as gases and liquids. The initial heat transfer between the object and the fluid takes place through conduction , but the bulk heat transfer happens due to the motion of the fluid.

How many types of convection are there?

There are two types of convection, and they are:

What is the process of heat?

According to the heat definition, heat is a form of energy that can be transferred from one medium to another through various processes like conduction, convection and radiation.

Why does land lose heat?

The land quickly loses heat when compared to water due to the differences in heat capacity. Consequently, the temperature of the sea is relatively higher, which creates low air pressure there. This sets up a flow of cool breeze offshore, known as the land breeze.

Why does coffee get cold?

You may have noticed that if you leave a cup of hot coffee on a table, it gets cold in some time. This is because heat is lost to the surroundings. Thus, heat transfer is the transfer of heat or thermal energy between physical systems. So when there is a temperature difference between two bodies, heat is transferred from the hot body to ...

What are some examples of forced convection?

Examples of forced convection are using water heaters or geysers for instant heating of water and using a fan on a hot summer day.

How does the sun heat up the atmosphere?

The sun heats up both the sea surface and land. As the sea has a greater heating capacity, it absorbs much of the sun’s energy but gets warmed up much slower than the land. As a result, the temperature above the land rises and heats the air in the atmosphere above it.

Why is heat transfer considered convection?

The process of heat transfer involves a change in the fluid phase, is also considered to be convection because fluid motion occurs during this process. The rise of vapor bubbles while boiling water is due to this.

What is the process of convection?

The process of convection, which involves the passage of a fluid over a surface through some external source , is called forced convection. Alternatively, when the fluid flow occurs due to forces induced by a variation in density and consequently, a difference in temperature, it is called natural convection.

What is Newton's law of cooling?

Newton's Law of Cooling. Under normal conditions, the heat transfer due to convection is directly proportional to the temperature difference between the parts. Newton's law of cooling has expressed this phenomenon, and the law states that: The heat transfer rate of a body due to convection is directly proportional to the temperature difference ...

Why is heat convection better than fluid conduction?

If the fluid motion is faster, the process of heat convection will be better, because a better fluid motion enhances the transfer of particles between the solid surface and the fluid. In the absence of any fluid motion, heat transfer occurs through the process of conduction through the vibrations of the molecules.

How does the sea breeze affect the temperature of the air?

Sea breeze: It occurs during the daytime—the heat radiations from the sun heat both the land and the sea surface. Due to the large heat capacity of water, the sea absorbs a significant portion of the incident heat radiation, but it gets heated up very slowly as compared to land. Due to this, the temperature of the land surface rises, further raising the temperature of the air above the lab surface. Warm air expands because it has less density, thereby creating low pressure above the land surface. Meanwhile, high pressure exists over the sea. This difference makes the air move from sea to land. This process is known as a sea breeze.

What is the process of the sea and land breeze?

This process is completely opposite from the sea breeze. When the sun sets, the land surface and the sea surface starts cooling down. The land surface cools quickly, whereas the sea surface doesn't lose its heat much easier. This increases the temperature of the air above the sea surface, thereby creating low pressure. At the same time, high air pressure is present above the land surface, and hence air moves from the land surface towards the sea. This phenomenon is called a land breeze.

What is the process of heat transfer?

What is Convection? Convection is the process of heat transfer in which transfer of heat energy occurs by the mass movement of molecules of the fluids like gases and liquids. Gases and liquids are not a good conductor of heat under normal conditions, but they can easily transfer heat.

What are the modes of heat transfer?

The different modes of heat transfer include: Conduction. Convection. Radiation. Meanwhile, if the temperature difference exists between the two systems, heat will find a way to transfer from the higher to the lower system.

What is the process of transfer of heat?

Any matter which is made up of atoms and molecules has the ability to transfer heat. The atoms are in different types of motion at any time. The motion of molecules and atoms is responsible for heat or thermal energy and every matter has this thermal energy. The more the motion of molecules, more will be the heat energy. However, talking about heat transfer, it is nothing but the process of transfer of heat from the high-temperature body to a low temperature one.

What is the process of heat flowing from objects with higher temperature to objects with lower temperature?

The process in which heat flows from objects with higher temperature to objects with lower temperature. An area of higher kinetic energy transfers thermal energy towards the lower kinetic energy area. High-speed particles clash with particles moving at a slow speed, as a result, slow speed particles increase their kinetic energy.

What happens to the wavelengths of the radiation emitted as temperature increases?

As temperature rises, the wavelengths in the spectra of the radiation emitted decreases and shorter wavelengths radiations are emitted. Thermal radiation can be calculated by Stefan-Boltzmann law:

How does thermal radiation work?

Thermal radiations are referred to as radiant heat. Thermal radiation is generated by the emission of electromagnetic waves. These waves carry away the energy from the emitting body. Radiation takes place through a vacuum or transparent medium which can be either solid or liquid. Thermal radiation is the result of the random motion of molecules in the matter. The movement of charged electrons and protons is responsible for the emission of electromagnetic radiation. Let us know more about radiation heat transfer.

What is the device used to measure radiation heat transfer?

Radiation heat transfer is measured by the device known as thermocouple. Thermocouple is used for measuring the temperature. In this device sometimes, error takes place while measuring the temperature through radiation heat transfer.

How does heat transfer from hands to ice?

Heat is transferred from hands to ice cube resulting in the melting of an ice cube when held in hands. Heat conduction through the sand at the beaches. This can be experienced during summers. Sand is a good conductor of heat.

What is the co-efficient of convective heat transfer?

● Convective heat transfer co-efficient ‘h’ is the quantity of heat transferred in unit time through unit area at a temperature difference of one degree between the surface and the surroundings.# N#Unit = W/ m 2 K

Why does natural convection occur?

Natural Convection: It occurs due to density difference caused by temperature gradient present between the fluid and the surface.

What is conduction in science?

Conduction. ● Conduction can occur in solids and fluids. It is the transfer of heat across a medium or objects which are in physical contact. ● A hot pan placed on a burner burns your hand if you touch it because conduction of heat takes place between the heated pan and your hand.

What is thermal equilibrium?

Thermal equilibrium occurs when macroscopic changes in the system cease to occur with time. If you put ice in a glass of water, the water being at a higher temperature will transfer heat energy to the ice cube. This will continue till the ice cube melts into water which is at the same temperature as the water in the glass. Thus, a state of thermal equilibrium is reached. Thermodynamics is applicable to systems that are in thermal equilibrium. The phenomenon of heat transfer deals with systems that are not in thermal equilibrium.

What are the two types of convection?

● Convection is of two types: 1 Natural Convection: It occurs due to density difference caused by temperature gradient present between the fluid and the surface. 2 Forced Convection: External means like fans, pumps, compressors are used to set the fluid in motion.

What is heat transfer?

As the name suggests, heat transfer is the travel of heat or thermal energy from one object or entity to another. This transfer takes place in three ways – conduction, convection, and radiation. This ScienceStruck post discusses the methods of heat transfer and its applications in detail.

What is the process of transfer of thermal energy from or to an object?

Heat can be defined as the process of transfer of thermal energy from or to an object. And as it is a process, objects or bodies do not contain heat but thermal energy.

What is the process by which heat is transmitted from one place to another without leaving the intervening medium?

Radiation is the process by which heat is transmitted from one place to another without leaving the intervening medium. It occurs in objects that emit electromagnetic radiation . No medium is required for the heat to travel.

What are the different types of heat transfer?

Heat can be transferred from one place to another by four different methods of heat transfer. There are: 1 Conduction 2 Convection 3 Radiation 4 Advection

What is the process by which heat flows from the region of higher temperature to the region of lower temperature?

Convection is the process by which heat flows from the region of higher temperature to the region of lower temperature by the actual movement of the particles of matter.

What is the energy that produces the sensation of hotness?

Heat is a form of energy which produces in us the sensation of hotness or coldness. Heat flows from high temperature side to low temperature side irrespective of the amounts of heat possessed by the bodies in contact.

How does air on land get heated?

So, air on land gets heated by convection and moves up. This place is then occupied by the cold air from the sea. This way a cycle of air movement stars known as land breeze. During night, land gets cooler faster than the water in the sea.

What is the process of heat transfer called?

Natural convection. If the material moves due to the difference in density, the process of heat transfer is known as natural convection. Natural convection is also known as free convection.

How does heat travel from one part of a body to another?

In solids, heat travels by conduction .

Which method of heat transfer does not require a medium?

We seem to have reached a fairly conclusive conclusion - that Radiative Heat Transfer is the ONLY method that does not require a ‘medium’.

What is heat transfer without a medium called?

Heat transfer without a medium [of transfer] is called RADIATION . Unlike conduction and convection which require a solid and a fluid (liquid or gaseous) medium respctively, radiation does not require a material medium. A typical example is the transfer of heat by the sun from outer space, which is devoid of gasses, to the earth. We are able to feel the effect of the heat from the sun without it passing through any medium.

How does radiation transfer heat?

Conduction is the heat transfer between two solids that are in contact, convection is the heat transfer between a fluid and a solid, and radiation is the heat transfer between two bodies that are not in contact and don’t have a medium between them to transfer the heat. This is the way the Sun heats up the Earth. The heat transfer is done by the infrared emission of the bodies. If I remember correctly, above 500 K, the radiation transfer is predominant over conduction and convection. Below 500 K, most of the heat is transferred trough convection and conduction.

What is the difference between conduction and radiation?

Conduction is the heat transfer between two solids that are in contact, convection is the heat transfer between a fluid and a solid, and radiation is the heat transfer between two bodies that are not in contact and don’t have a medium between them to transfer the heat. This is the way the Sun heats up the Earth. The heat transfer is done by the infrared emission of the bodies. If I remember correctly, above 500 K, the radiation transfer is predominant over conduc

What are the three modes of heat transfer?

The transfer of heat from one body to another takes place through three modes:- 1 Conduction 2 Convection 3 Radiation

What is thermal radiation?

Thermal radiation is the transfer of heat or mode of heat transfer in the form of electromagnetic waves or photon which doesn't require medium or it may travel in vacuum as well.

Why does heat transfer occur through electromagnetic waves?

Because in radiation heat transfer occurs through electromagnetic waves and em waves doesn't require any medium to propogate. Ex of em waves :- radio waves ,gamma rays etc. depending upon different wavelength and temp.

image

Summary

Convection (or convective heat transfer) is the transfer of heat from one place to another due to the movement of fluid. Although often discussed as a distinct method of heat transfer, convective heat transfer involves the combined processes of conduction (heat diffusion) and advection (heat transfer by bulk fluid flow). Convection is usually the dominant form of heat transfer in liquids and ga…

Overview

Convection can be "forced" by movement of a fluid by means other than buoyancy forces (for example, a water pump in an automobile engine). Thermal expansion of fluids may also force convection. In other cases, natural buoyancy forces alone are entirely responsible for fluid motion when the fluid is heated, and this process is called "natural convection". An example is the draft in a chimney or around any fire. In natural convection, an increase in temperature produces a reduc…

Types

Two types of convective heat transfer may be distinguished:
• Free or natural convection: when fluid motion is caused by buoyancy forces that result from the density variations due to variations of thermal ±temperature in the fluid. In the absence of an internal source, when the fluid is in contact with a hot surface, its molecules separate and scatter, causing the fluid to be less d…

Newton's law of cooling

Convection-cooling is sometimes loosely assumed to be described by Newton's law of cooling.
Newton's law states that the rate of heat loss of a body is proportional to the difference in temperatures between the body and its surroundings while under the effects of a breeze. The constant of proportionality is the heat transfer coefficient. The law applies when the coefficient is independent, or relatively independent, of the temperature difference between object and enviro…

Convective heat transfer

The basic relationship for heat transfer by convection is:
where is the heat transferred per unit time, A is the area of the object, h is the heat transfer coefficient, T is the object's surface temperature, Tf is the fluid temperature, and b is a scaling exponent.
The convective heat transfer coefficient is dependent upon the physical properties of the fluid a…

See also

• Conjugate convective heat transfer
• Convection
• Forced convection
• Natural convection
• Mixed convection

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      receivinghelpdeskask
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        Metadata
        Bindings
        • 0. 2025-06-25 06:34:44
        • 1. what-is-convection-does-it-need-any-medium-for-transfer-of-heat
        Backtrace
        • 15. /app/Providers/RouteServiceProvider.php:54
        • 18. /vendor/laravel/framework/src/Illuminate/Routing/Router.php:842
        • 19. Route binding:39
        • 20. /vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php:167
        • 21. /vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/VerifyCsrfToken.php:78
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        18.79msmiddleware::checkdate:30receivinghelpdeskask
        Metadata
        Bindings
        • 0. 192298
        • 1. 0
        Backtrace
        • 19. middleware::checkdate:30
        • 20. /vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php:167
        • 21. /vendor/laravel/jetstream/src/Http/Middleware/ShareInertiaData.php:61
        • 22. /vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php:167
        • 23. /vendor/laravel/framework/src/Illuminate/Routing/Middleware/SubstituteBindings.php:50
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        Metadata
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        • 17. /vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
        • 18. /vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:45
        • 19. /vendor/laravel/framework/src/Illuminate/Routing/Route.php:261
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        Metadata
        Bindings
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        • 19. /vendor/outl1ne/nova-menu-builder/src/Models/Menu.php:35
        • 20. /vendor/outl1ne/nova-menu-builder/src/helpers.php:33
        • 22. /vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
        • 23. /vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:45
        • 24. /vendor/laravel/framework/src/Illuminate/Routing/Route.php:261
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        • 25. /vendor/outl1ne/nova-menu-builder/src/helpers.php:33
        • 27. /vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
        • 28. /vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:45
        • 29. /vendor/laravel/framework/src/Illuminate/Routing/Route.php:261
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        1.12s/app/View/Composers/SidebarView.php:22receivinghelpdeskask
        Metadata
        Bindings
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        Backtrace
        • 14. /app/View/Composers/SidebarView.php:22
        • 15. /app/View/Composers/SidebarView.php:12
        • 16. /vendor/laravel/framework/src/Illuminate/View/Concerns/ManagesEvents.php:124
        • 17. /vendor/laravel/framework/src/Illuminate/View/Concerns/ManagesEvents.php:162
        • 20. /vendor/laravel/framework/src/Illuminate/View/Concerns/ManagesEvents.php:177
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        Metadata
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        • 25. /vendor/livewire/livewire/src/ComponentConcerns/RendersLivewireComponents.php:69
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