convective temperature flux

Unknown
Unknown
edited October 2022 in Community Q&A

Hi all,

image

1. What is convective temperature flux? What is its unit?

2. What is H in convective temperatue flux? Is it enthalpy or specific enthalpy?

3. What is k_tot in the second formula? It is thermal conductivity but why subscript tot?

4. I think q refers to heat flux. So, the second formula should correspond to surface integrated heat flux (W), right?

 

Thanks!

 

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Answers

  • acupro
    acupro
    Altair Employee
    edited October 2022

    1. Convective temperature flux (CTF) is the non-zero heat flux (W/m^2) at inlets and outlets - or convection of energy due to the flow itself.  CTF would typically be zero at a wall because the velocity is zero (based on mesh resolution and convergence level).  The area integration (for Surface Integrated Output) would results in Watts.

    2. H would thus be J/kg - like specific enthalpy - to get the complete units to work out as expected.

    3. K_Tot is the total conductivity - material/molecular plus turbulent.

    4. Correct the Integrated quantity would be heat flux - W - on the surface, same units as for Integrated Convective Temperature Flux as described above.  Integrated Heat Flux would normally be approximately zero for inlet/outlet and non-zero for walls.

    The definitions of terms are below the definitions of integrals/equations towards the lower portion of this page:
    https://2022.help.altair.com/2022.1/hwcfdsolvers/acusolve/topics/acusolve/post_processing_programs_acutrans.htm

     

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