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Convective heat transfer film na factors

2012/9/4 12:10:22  Origin:  Publisher:

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The study flow heat exchanger shadow Na factors

  1. The cause of the flow according to the flow of cause, the convective heat transfer can be divided into two categories of natural convection heat transfer by forced convection heat transfer. Natural convection within the fluid the Internal temperature field uneven density field uneven flow caused by buoyancy. Forced convection fluid flow fans, pumps or other external force, in general, natural convection flow rate is more susceptible to the forced flow, thus the surface heat transfer coefficient.

  2. Flow state of fluid flow, laminar, transitional and turbulent flow. Fluid for laminar flow when the fluid stratified flow, interlayer blended, depends mainly on the thermal conductivity perpendicular to the direction of flow of the heat transfer (i.e., molecular diffusion). Turbulent fluid memory disturbance strengthened and mixed convection heat transfer in addition to the thermal conductivity of the way, mainly by the macroscopic fluid turbulence pulsating turbulent convective heat transfer surface of the heat transfer coefficient than laminar convective heat transfer large.

  3. Fluid physical properties affect the physical properties of the convection heat transfer: thermal conductivity, density, specific heat capacity, Ru, etc..

  4. Ten thousand yuan phase change fluid fluid in the convective heat transfer process is sometimes accompanied by a phase change, such as the refrigeration system, the refrigerant liquid flowing through the evaporator due to vaporization bath heat into steam, and the refrigerant vapor in the stream * stronger than a boat fluid occurs when the phase change heat exchanger heat exchanger when no phase change into a liquid condenser, the heat release of the coagulation bath.

  5. The geometric factors of the heat exchanger surface of the heat transfer surface and the geometric shape, size, relative position, and a surface Rent legs and other geometrical factors will affect the condition of the flow of the fluid heat exchanger.

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