Menu

Discussion Forum

New Discussion
Filter

Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.

Convective cooling expression

Posted May 2, 2012, 11:15 a.m. EDT Heat Transfer & Phase Change, Modeling Tools & Definitions, Parameters, Variables, & Functions Version 4.2a 1 Reply

Sushant Agarwal
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

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 May 2, 2012, 3:28 p.m. EDT
Nagi Elabbasi Facebook Reality Labs
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago May 2, 2012, 3:28 p.m. EDT
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

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.

Suggested Content