Heat transfer Convective

Heat transfer is one of the key processes in engineering and technology associated with the transfer of heat from one medium to another. One type of heat transfer is convective heat transfer, which occurs when heat is transferred between a solid body and a gaseous medium.

Convective heat transfer occurs as a result of gas movement caused by temperature differences. Gas heated by the surface in contact with it expands, becomes less dense and rises. Thus, it takes away some of the heat with it. This process is called convection.

Convective heat transfer plays an important role in various technical applications such as cooling of electronic components, cooling of aircraft engines, and heating and air conditioning systems.

An important parameter affecting the efficiency of convective heat transfer is the heat transfer coefficient. It is defined as the amount of heat transferred from the surface to the gas, per unit time and unit surface area, divided by the temperature difference between the surface and the gas. The higher the heat transfer coefficient, the more heat is transferred from the surface to the gas.

To increase the heat transfer coefficient, special surfaces are often used, for example, ribbed or perforated. They create additional turbulent flows in the gas, increasing the efficiency of heat transfer.

Thus, convective heat transfer is an important process in various engineering applications. It depends on many factors, such as the temperature difference between the surface and the gas, the speed of gas movement, the shape of the surface and others. Understanding these factors allows you to optimize the heat transfer process and increase its efficiency.

Convective heat transfer is a heat transfer process in which heat is transferred by a flow of liquid or gas.

During convective heat transfer, a heated liquid or gas transfers heat from more heated areas to less heated areas due to its movement. This method of heat transfer is called convection.

Convective heat transfer can be:

1. Natural - when the movement of the coolant occurs under the influence of the difference in densities of heated and unheated areas of the medium. For example, hot air rises and cold air falls down.

2. Forced - when the movement of the coolant occurs under the influence of external forces (pump, fan, compressor, etc.).

Convective heat exchange is widely used in heat exchangers, cooling systems, heating, ventilation and other technical devices and processes. The efficiency of convective heat exchange depends on the physical properties of the coolant, the speed of its movement, the geometry of the heat exchange surface and other factors.