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Flim Boiling Boiling

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Old   February 14, 2015, 06:09
Default Flim Boiling Boiling
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Hello,

I am trying to simulate the boiling of water over a heated surface. The temperature of plate is high so initially film boiling should occur. The heat transfer rate should be low. As temperature decreases, the boiling should change to Nucleate boiling.

How can I successfully simulate this? I tried with mixture model and Boiling model in Eularian multiphase mode, but they are not giving the correct contours ( I have experimental results to compare to.) There is supposed to be a quick dip in temperature as film boiling ends and the cool water touches the surface. I am not getting this.

Should I be using somesort of UDF for this? Is there any established or validated UDF for post critical heat flux boiling?
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Old   October 24, 2016, 08:17
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Quote:
Originally Posted by tsram90 View Post
Hello,

I am trying to simulate the boiling of water over a heated surface. The temperature of plate is high so initially film boiling should occur. The heat transfer rate should be low. As temperature decreases, the boiling should change to Nucleate boiling.

How can I successfully simulate this? I tried with mixture model and Boiling model in Eularian multiphase mode, but they are not giving the correct contours ( I have experimental results to compare to.) There is supposed to be a quick dip in temperature as film boiling ends and the cool water touches the surface. I am not getting this.

Should I be using somesort of UDF for this? Is there any established or validated UDF for post critical heat flux boiling?
hi, maybe late for you, have you found any suitable model for CHF? i am trying use mixture model and mass-energy transfer udf to simulate two-phase flow with phase change and CHF, and I get the sharp increase of wall temperature. but I still not sure it is a correct CHF phenomena, do you think it is right to use mixture model to simulate the CHF phenomena?
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Old   October 24, 2016, 09:06
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Originally Posted by dxm2008 View Post
hi, maybe late for you, have you found any suitable model for CHF? i am trying use mixture model and mass-energy transfer udf to simulate two-phase flow with phase change and CHF, and I get the sharp increase of wall temperature. but I still not sure it is a correct CHF phenomena, do you think it is right to use mixture model to simulate the CHF phenomena?
Hello,

You have to write UDFs to correctly model for this. I don't have my files anymore, you will find some similar ones in Internet.
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Old   October 24, 2016, 09:12
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Originally Posted by tsram90 View Post
Hello,

You have to write UDFs to correctly model for this. I don't have my files anymore, you will find some similar ones in Internet.
thank you for your reply, so you are sure that mixture model will work well with wall boiling and CHF phenomena if I can write essential UDFs.~
dong
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