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Moist air condensation modeling for heat exchanger

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Old   November 18, 2021, 15:43
Question Moist air condensation modeling for heat exchanger
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Ravi Patel
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Hello, I was wondering how it would be possible to model cooling of hot exhaust (modeled as moist air) with dehumidification (condensation formation)? I am an absolute beginner at modeling multiphase flows but I have used Fluent in the past to model single phase flow of air. The reason I need help on this is because I am trying to find the overall heat transfer coefficient (U value) between the moist air traveling past the surface of a heat exchanger with a cold fluid traveling in the heat exchanger. After I find the U value, I am able to find the required heat transfer surface area based off of the cooling load and LMTD. I modeled this using moist air without condensation but I would like to try to validate my results using ANSYS Fluent because I know that condensation on the surface of the heat exchanger would increase the film coefficient of the moist air. I attached some pictures of the hand calculations I used to find the required cooling load and the excel calculator. If someone could help me get started on this it would be much appreciated.
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File Type: jpg psychrometric excel calc.jpg (72.9 KB, 11 views)
File Type: jpg sample psychrometric calculation.jpg (65.2 KB, 13 views)
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condensation, heat exchanger, heat transfer coefficient, moist air, multi phase

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