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Heat Transfer Coefficient of air vs Velocity

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Old   May 7, 2014, 20:21
Default Heat Transfer Coefficient of air vs Velocity
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The heat transfer coefficient of air is normally 100 W/m^2K at medium velocity.
And all know that the heat transfer coefficient is a function of air velocity. How high can the heat transfer coefficient increase with the velocity?

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Old   June 10, 2014, 03:08
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Hi Shree,

The HTC (heat transfer coefficient) depends on the flow configuration (e.g., flow on a horizontal or vertical flat plat, flow in a duct, etc), the flow being developed or developing, laminar or turbulent, the Reynolds and Prandtl numbers and surface roughness. There are many correlations for the HTC (e.g., Dittus-Boelter) giving explicit relations for Nu (Re, Pr) for various configurations at given ranges of Re and Pr (see, e.g., Ozisik or Holman books). If you choose an appropriate correlation for your problem, you will be able to estimate the HTC.
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