Hi, thanks for the tutorial. I have tried repeat the same procedure with water and I got similar with the tutorial. However, when I am using air as working fluid and its properties is taken at 25C, at 1 atm pressure, the Nu obtained is quite difference with dittus correlation. Do you have any advice on that? Thank you.
Hi, could you please try density-based solver as the compressibility effects are large if you use air as a working fluid? Also, you should check if the ideal gas model is used. Thank you!
Hi, @@cfdandbeyond . Thanks so much for the prompt response. And yes, I have considered your suggestion to use a density-based solver, and it is working. The simulation result seems more close to the Glineski correlation, followed by the Pethukhov and Dittus correlations. Overall, the error is less than 15%, I can say. Anyway, thank you again.
Thank you so much, could you please explain the method of creating UDF for a fully developed profile at the entrance without the need to build the entrance geometry?
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Hi, thanks for the tutorial. I have tried repeat the same procedure with water and I got similar with the tutorial. However, when I am using air as working fluid and its properties is taken at 25C, at 1 atm pressure, the Nu obtained is quite difference with dittus correlation. Do you have any advice on that? Thank you.
Hi, could you please try density-based solver as the compressibility effects are large if you use air as a working fluid? Also, you should check if the ideal gas model is used. Thank you!
Hi, @@cfdandbeyond . Thanks so much for the prompt response. And yes, I have considered your suggestion to use a density-based solver, and it is working. The simulation result seems more close to the Glineski correlation, followed by the Pethukhov and Dittus correlations. Overall, the error is less than 15%, I can say. Anyway, thank you again.
Thank you so much, could you please explain the method of creating UDF for a fully developed profile at the entrance without the need to build the entrance geometry?