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How do i set the reference temperature for developing region on natural convection

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Old   November 17, 2015, 01:10
Question How do i set the reference temperature for developing region on natural convection
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David Ohk
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i have researching the natural convection inside vertical pipe
flows through the vertical pipe is driven by natural convection force

i am looking for inside surface heat transfer coefficient varying with diameter, length(GrL=3*10^8 - 4*10^10) and Prantdl number(0.7, 20, 2,014).
(wall condition is constant temp)

it is difficult to define reference temperature in pipe.

i made up the central line and apply the line average temperature for ref. temp.

is it make sence for develpoing region. or tell me another ways

thanks for all.
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Old   November 17, 2015, 01:17
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David Ohk
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also i have gained very high heat transfer coefficient that i establish the high reference temp.

i think it is not make sence for thin, long pipe. it looks something was wrong.
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fluent 6.3, natural convection, pipe flow, reference -values, temperature average value

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