How can I find value of convective heat transfer coefficient (h) of free air at -20 degree Celsius? Is there any h vs T graph? Or data table?
Description: The air is under natural free convection and the pressure is 1 bar to 0.1 bar.
That all depends on what the air is doing in relation to the surfaces of interest. Is the air flowing? Is the air stagnant? Is the air free to flow should the opportunity for natural convection arise? Please provide more information.
Dudley J Benton Sir, the air is under natural free convection and the pressure is about 1 bar to 0.1 bar.
A good place to find information like this is https://www.engineeringtoolbox.com
The question should be more comprehensive, providing additional information regarding the surface of heat transfer with air. For instance, we need to know the characteristics of the surface such as its thermal boundary conditions. Assuming the surface can be considered as a plate with specific thermal boundary conditions and a constant heat flux, we can determine the convective heat transfer coefficient using both the similarity parameter method and integral method. This calculated coefficient can then be used to evaluate the convective heat transfer rate.
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