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Convective cooling expression

Posted 2 mag 2012, 11:15 GMT-4 Heat Transfer & Phase Change, Modeling Tools & Definitions, Parameters, Variables, & Functions Version 4.2a 1 Reply

Sushant Agarwal
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Hello:

In Heat Transfer module, what is the reference for expression for convective heat transfer coefficient for external natural convection and others, such as Rayleigh #?
COMSOL shows following expression for ht.h_cc


nojac(ht3.kExtFluid_cc2*(flc1hs(1000000000-ht3.Ra_cc2,100000000)*(0.68+0.67*ht3.Ra_cc2^0.25*cos(ht3.phi_tilt)/(1+(0.492*ht3.kExtFluid_cc2/(ht3.muExtFluid_cc2*ht3.CExtFluid_cc2))^0.5625)^0.4444444444444444)+flc1hs(-1000000000+ht3.Ra_cc2,100000000)*(0.825+0.387*ht3.Ra_cc2^(1/6)/(1+(0.492*ht3.kExtFluid_cc2/(ht3.muExtFluid_cc2*ht3.CExtFluid_cc2))^0.5625)^0.2962962962962963)^2)/3)

Thanks
1 Reply Last Post 2 mag 2012, 15:28 GMT-4
Nagi Elabbasi Facebook Reality Labs
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Posted: 1 decade ago 2 mag 2012, 15:28 GMT-4
You will find the equations used described in the manual in “Heat Transfer Module > Heat Transfer Theory > About the Heat Transfer Coefficients”. Most of the equations are from these two references:

1. F.P. Incropera and D.P. DeWitt, Fundamentals of Heat and Mass Transfer
2. A. Bejan, Heat Transfer

Nagi Elabbasi
Veryst Engineering
You will find the equations used described in the manual in “Heat Transfer Module > Heat Transfer Theory > About the Heat Transfer Coefficients”. Most of the equations are from these two references: 1. F.P. Incropera and D.P. DeWitt, Fundamentals of Heat and Mass Transfer 2. A. Bejan, Heat Transfer Nagi Elabbasi Veryst Engineering

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