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Nu value of 2-D Channel

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Old   September 5, 2002, 07:10
Default Nu value of 2-D Channel
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Where can I found the value of Nu for a 2-D channel.

I want to Nu for Re=40,000 based on double the channel height (2H) or 20,000 (based on charac lenght H)
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Old   September 5, 2002, 10:20
Default Re: Nu value of 2-D Channel
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You'll find it in any standard heat transfer textbook (e.g., Holman, Ozisik, etc.). For tubulent flow, it is usually given as correlations in the form:

Nu = c * Re^m * Pr^n

where Re and Pr are Reynolds and Prandtl numbers, and c, m, n are the correlation parameters.
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Old   September 5, 2002, 12:35
Default Re: Nu value of 2-D Channel
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but if it is a mixed convection case, add Gr in the corelation formula. you can find this in any heat transfer book.

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