# Heat and Mass Transfer UDF

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 August 8, 2005, 16:51 Heat and Mass Transfer UDF #1 Srinivas Parimi Guest   Posts: n/a Hello all, I hope you are all familiar with the heat and mass trasfer example provided in the Fluent advanced tutorials. The UDF in it has a calculation of mass flow rate. if(cell mixture temp. >= sat. temp.) mass flow rate of liquid = -0.1*liquid VOF*liquid density* normalized liquid temp. from saturation temp. I am kind of confused here to understand a few things... 1) Is the unit of VOF of that of volume? 2) what is the 0.1 in this equation mean? Thanks in advance, Srinivas Parimi

 August 11, 2005, 22:08 Re: Heat and Mass Transfer UDF #2 Joey Guest   Posts: n/a The unit of VOF is not volume, it is just a parameter without unit. The parameter of "0.1" is time relaxation and has a unit of "1/s" This formula comes from Wenhe Lee(1975) who is Chinese like me.

 August 12, 2005, 00:33 Re: Heat and Mass Transfer UDF #3 Srinivas Parimi Guest   Posts: n/a Hello Joey, Thank you for your response. If VOF has no units and 0.1 has units of 1/time, the dimensions dont add up on each sides of the equation. There is a volume term still missing. Thanks in advance, Srinivas Parimi

 August 22, 2005, 13:49 Re: Heat and Mass Transfer UDF #4 Assefa Ayalew Guest   Posts: n/a tutorials on conduction

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