Views:1 Author:Site Editor Publish Time: 2020-09-11 Origin:Site

As heat exchange equipment, we are mainly concerned with heat transfer and convection heat transfer. Convective heat transfer mostly refers to the heat transfer between the fluid and the solid wall. The heat transfer rate is closely related to the properties of the fluid and the condition of the boundary layer. As shown in the figure, a temperature boundary layer is formed near the wall. The temperature difference is mainly concentrated in the laminar bottom layer. Assuming that the temperature difference between the fluid and the wall is all concentrated in the effective film with a thickness of δ1', the film is neither a thermal boundary layer nor a non-flowing boundary layer, but a virtual heat transfer temperature difference that concentrates all the heat transfer temperature differences and conducts heat conduction. membrane. The convective heat transfer rate equation can be described by Newton’s law of cooling, which is an experimental law:

2 Convective heat transfer:

Convection heat transfer mostly refers to the heat transfer between the fluid and the solid wall, and the heat transfer rate is closely related to the fluid properties and the condition of the boundary layer. As shown in the figure, it causes temperature changes near the wall to form

Temperature boundary layer. The temperature difference is mainly concentrated in the laminar bottom layer. Assuming that the temperature difference between the fluid and the wall surface is all concentrated in the effective film with a thickness of δ1', the film is neither a thermal boundary layer nor a non-flow boundary layer, but a virtual virtual system that concentrates all the heat transfer temperature differences and conducts heat conduction. membrane. The convective heat transfer rate equation can be described by Newton’s law of cooling, which is an experimental law: Newton’s law of cooling can be used for both fluids.

means: Q=αAΔt where: Q----heat flow of convective heat transfer, W;

A----Convection heat transfer area, m2;

Δt----The difference between the wall temperature and the average temperature of the fluid in the normal direction of the wall, K;

Α----The proportional coefficient, called the surface heat transfer coefficient, W/(m².K)

The calculation of the convective heat transfer process comes down to how to obtain it. It is generally determined by experiment, using scientific test methods.

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