The heat transfer film(PRINT-LABELS) coefficient, also known as heat transfer coefficient, is a parameter to measure the intensity of convective heat transfer. It is the heat transferred by fluid through unit heat transfer area under the push of unit temperature difference in unit time.
The reciprocal of the product of the heat transfer film coefficient and the heat transfer area is the thermal resistance of convective heat transfer, and sometimes the reciprocal of the heat transfer film coefficient is also used to represent the thermal resistance of convective heat transfer. The coefficient of heat transfer film is related to whether there is phase change during heat transfer, fluid flow condition, solid wall structure and size, and physical properties of fluid itself (such as thermal conductivity, viscosity, density, specific heat capacity), etc. The coefficient of heat transfer film with phase change convection is usually much larger than that without phase change convection. Improving the coefficient of heat transfer film is one of the objectives of studying convective heat transfer.
The common method to obtain heat transfer and thermal film coefficient in engineering is to use similarity theory or dimensional analysis to determine dimensionless number groups related to convective heat transfer process, such as Prandel number Pr, reynolds number Re and nusselt number Nu, etc. Then the relationship between them is obtained through experiments.
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