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Calculating total heat flux of laminar internal flow inside circular tube

Posted 09.10.2014, 15:26 GMT-4 Version 4.3b 0 Replies

Binjian Ma
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I am now trying to simulate a laminar flow condition inside a 0.5'' OD (0.07'' wall) circular tube with convection on the outer surface. I used the conjugate heat transfer module and defined the inlet temperature, velocity, outlet pressure, convective heat transfer coefficient and ambient temperature. The simulation seems work fine but when I tried to calculate the total heat flux by taking the surface integral of the normal total heat flux (nitf.ntflux), the result of the integration over interior wall is quite different from that over the exterior wall. Since I am doing a steady state analysis, these two terms should be same if we c.v. the tube wall and perform an energy balance analysis. Also, the average Nusselt number I calculated is way too small than the value I obtained from theoretical calculation. Any idea or suggestion on how this comes?
0 Replies Last Post 09.10.2014, 15:26 GMT-4
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Hello Binjian Ma

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