# Conjugate heat transfer

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 January 17, 2002, 09:31 Conjugate heat transfer #1 Jing Guest   Posts: n/a Hi, I am working on simulating a fluid-solid cooling system in StarCD version 3.10. I have several questions about the conjugate heat transfer. 1) In my case, the fluid region is compressible and there is heat transfer between solid and fluid. I wonder if I should choose total enthaply as a conservation parameter for solving energy equation of fluid. 2) How does StarCD calculate the temperature on the fluid/solid interface? In the manual, it is only said that the continuity of the energy flux is considered. All opinions are appreciated!

 January 17, 2002, 13:53 Re: Conjugate heat transfer #2 john Guest   Posts: n/a 1. you can choose total enthalpy. 2. you have heat flux from solid side, say, Hflux_solid=(T_wall - T_cell_solid)/D_solid * C where D_solid is distance between wall and near wall cell in solid, and C is heat conductivity. Heat flux from fluid side, is, Hflux_fluid=(T_wall - T_cell_fluid)/D_fluid *Coeff where the coefficient Coeff depends on if the fluid is laminar or turbulent (in later case, normally a kind of wall function is used). By equating these two heat fluxes, you can then get T_wall, the temperature at solid-fluid interface.

 January 17, 2002, 13:55 Re: Conjugate heat transfer #3 john Guest   Posts: n/a sorry, both equations should be multiplied by the wall face area.

 January 21, 2002, 11:06 Re: Conjugate heat transfer #4 Jing Guest   Posts: n/a Hi, John! Thanks for your ideas! The second point you written down about the calculation of T_WALL is just what we means the "CONJUGATE HEAT TRANSFER". I would like to make sure again: Does StarCD calculate the T_WALL in this way? I ask so only because that it is not mentioned in the manual. Thanks!

 January 21, 2002, 11:27 Re: Conjugate heat transfer #5 john Guest   Posts: n/a Yes, that is how STAR-CD calculates wall temperature at solid-fluid interface.