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Old   June 7, 2006, 18:41
Default Cavitation Model
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Umesh Shah
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Hi,

For a cavitating flow where mainly vaporization takes place, how can we incorporate the temperature change of mixture? My application involves high pressure drop between inlet and outlet. I understand that using ideal gas for vapor phase solves the energy equation. But it doesn't take into account the heat consumed for vaporization. In my application the process is adiabatic so the temperature change in mixture is mainly due to latent heat of vaporization. Can I have your help how can I incorporate this effect?

Thank you so much for your time and help. Umesh

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Old   June 8, 2006, 16:44
Default Re: Cavitation Model
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k
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You also need to take in account increase in temperature due to bubble collapse (compression)

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Old   June 9, 2006, 01:28
Default Re: Cavitation Model
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mateus
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Hi!

I think the problem could be solved by considering both phases to be compressible. In bubbly flow you get very low sonic speeds which results in extreemly compressible flow. For example the sonic speed in vapour is approx. 200 m/s, in pure water 1400m/s and in mixture (50-50) about 15m/s. In fluent 6.2. they say it is possible to include this but as soon as one sets both phases to compressible an errof message pops out - only one compressible phase allowed. I think that the integral increase of temperature due to bubble collapse is relatvelly small if at all measureble.

I hope i helpet a bit, although I didn't answer your question directly. I think some guys from Pisa University wrote a paper on a similar metter - send me an email if your interested (i think i have it), or go to cav2003 webpage - i think i found it there.

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