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Free convection

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googool

Mechanical
Mar 3, 2005
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EU
Hello
How can i calculate the average Nusslet number for free convection over rectangular duct
thx
 
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You need to calculate the vertical sides seperate from the top & bottom surfaces. THen add up the conductivities using formulas for parallel resistances. "Advanced Heat Transfer" by Rosenhow & Choi has simplified formulas for upward facing, downward facing and verticla surfaces in contact with air.
 
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