Pls the conditions for heat transfer are and .

There is a temperature difference in contact with each other (I have the impression that this is it).

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What are the heat transfer conditions? The way in which the heat is transferred

The condition for heat transfer is the temperature difference. Heat transfer refers to the phenomenon of heat energy transfer caused by temperature differences, and there are three basic forms, namely heat conduction, heat radiation, and heat convection. As long as there is a temperature difference between or within objects, thermal energy can be transferred from high to low temperatures in one or more of the three ways of heat conduction, heat radiation, and heat convection.

There are three ways in which heat is transferred

Heat conduction refers to the phenomenon of energy transfer when there is a temperature difference between different objects or within the same object, and the molecules, atoms, and electrons inside the object will undergo microscopic vibrations, displacements, and collisions with each other.

Thermal radiation refers to the phenomenon in which an object radiates electromagnetic waves due to its temperature. The higher the temperature, the greater the total energy radiated. In general, thermal radiation is mainly propagated by visible light and infrared rays with longer wavelengths.

Thermal convection refers to the heat transfer process in which the particles inside the fluid are relatively displaced, and the thermal convection is also accompanied by the heat conduction caused by the microscopic particle movement of the fluid.

Introduction to heat transfer

One of the two ways to change the internal energy of the system, the other way is to do work. Heat always travels from the hot end to the cold end. The method of heat transfer, in which heat is transferred from one object to another, or from one part of an object to another, through direct contact, is called heat transfer.

In the process of heat transfer, heat is generally used to measure the amount of internal change. Heat transfer is further divided into heat convection, heat conduction, and heat radiation. In fact, these three types of heat transfer often coexist at the same time, thus increasing the complexity of the process.

For a solid heat source, when the temperature difference between it and the surrounding medium is not very large (about 50 °C or less), the heat transfer q from the heat source to the surrounding medium can be calculated by Newton's cooling law, where S is the surface area for heat exchange and the heat exchange is uniform on S, which is the temperature of the solid, O is the temperature of the medium away from the heat source, T is the time of heat exchange, and is the surface heat transfer coefficient. The process of heat transfer achieved by a thermal convection fluid by relying on its macroscopic flow is called thermal convection. It is characterized by the fact that the heat transfer is accompanied by the directional movement of a large number of molecules.

Thermal convection is further divided into natural convection and forced convection.

The only condition for heat transfer to occur is the presence of a temperature difference, regardless of the state of the objects, whether the objects are in contact with each other or not.

Heat transfer (or heat transfer) is a physical phenomenon in physics, which refers to the transfer of heat energy due to temperature differences. In heat transfer, heat is used to measure the change in the internal energy of an object.

The heat conduction inside the gas is mainly due to the irregular thermal movement of the molecules inside it, which is the result of collision with each other; In a non-conductive solid, it vibrates near the equilibrium position of its lattice structure to transfer energy to neighboring molecules to achieve heat conduction. Whereas, the heat conduction of metallic solids is accomplished by the movement of free electrons between the lattice structures.

There are three main forms of heat transfer: heat conduction, heat radiation, and heat convection. As long as there is a temperature difference within or between objects, heat energy must be transferred from high to low temperature in one or more of the above three ways.

For a solid heat source, when the temperature difference between it and the surrounding medium is not very large (below about 50°C), the heat transfer from the heat source to the surrounding medium can be calculated by Newton's cooling law.

There is only one reason why thermal conditions can occur between two objects, or between two parts of an object: there is a temperature difference.

Heat transfer occurs between the flame and the water shell because the temperature of the flame is higher than that of the kettle. Soon after the water starts to boil, you can see the convection of the water in the shell, that is, because the water below is warmer than the water above.

The conditions for heat transfer to occur must be two objects and there is a temperature difference. It is only when the temperature is different that heat transfer occurs between the two objects. Heat transfer is the process by which heat is transferred from a hot object to a low temperature object, or from a hot part of an object to a low temperature part.

Heat transfer is a natural phenomenon that is prevalent in nature. As long as there is a temperature difference between objects or between different parts of the same object, the phenomenon of heat transfer will occur and will continue until the temperature is the same. The result of heat transfer is the disappearance of the temperature difference, i.e. the same temperature is achieved between objects or different parts of the object where heat transfer occurs.

Heat transfer: 1. Definition: It is the process of heat transfer from a high-temperature object to a low-temperature object, or from the high-temperature part of an object to the low-temperature part. Heat transfer is a natural phenomenon that is prevalent in nature.

2. Conditions: As long as there is a [temperature difference] between objects or between different parts of the same object, there will be heat transfer phenomena, and it will continue until the temperature is the same.

3. Essence: To change the internal energy of an object by means of heat transfer, that is, a part of the internal energy of an object is transferred to another.

objects, or internal energy transfers from the high temperature part of the same object to the low temperature part. (internal energy transfer process).

In the process of heat transfer, the matter does not migrate, but the hot object emits heat, the temperature decreases, the internal energy decreases (to be precise, the average kinetic energy of the molecules in the object does irregular motion decreases), the low temperature object absorbs heat, the temperature increases, and the internal energy increases. Therefore, the essence of heat transfer is the process of transferring energy from a hot object to a low temperature object, which is a way of energy transfer. It is the internal energy that is transferred by heat transfer, not the temperature.