Cavitation model by A.K. Singhal
Hello everyone
To simulate the cavitating flow, FLUENT has used A K Singhal's full cavitation model. But the model equations for rate of evaporation or condensation has inconsistency in dimensions. The correct unit of rate of evaporation or condensation should be kg/m3.s, but according to the above mentioned model equations the unit of that particular rate is coming as kg/m4 (by assuming that the empirical constants are dimensionless). If empirical constants have unit then what its value in particular SI unit and if not then how this could be possible? If I have some misconceptions then please help me out. Thank you. |
Can you share the paper which has the caviation model in it so that i can have a look at the dimension
regards shk |
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SINGHAL A.K., ATHAVALE M.M., HUIYING L., JIANG, L., 2002. Mathematical bases and validation of the full cavitation model. J Fluids Eng 124, 617-624. Thanks |
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i tried to asses the journal but it is blocked at my place . I f you have acces to that paper can you send me that paper . Regards shk |
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Hello!
(1) I also read A. K. Singhal paper and I came across the same question about the SI-units of Rc and Re. If Cc and Ce are dimensionless, Rc and Re have SI-unit of [kg/m⁴]. I am expecting SI-unit of [kg/(m³s)]. It is also written in the paper, that Rc and Re are 'phase change rates'. So, there should be Time (s) included in SI-unit of Rc and Re. (2) fg: Is there a model how to implement a transport equation for non-condensable gas (fg)? In my opinion, fg varies in fluid domain and depends on absolute pressure. I am posting this to ANSYS/Fluent Forum, as I am continuing this thread. But this is a comprehension question, independent of solver. I am glad to read your comments. Thanks for feedback. |
Non-condensable gas transport equation
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Finally, I found one paper (Modelling and Validation of Cavitating Orifice Flow in Hydraulic Systems, P. Casoli) which is dealing with the transport equations for non-condensable gas. I am struggeling with the definition of the mentioned equilibrium differential pressure, as used in eqn. 5. Can someone help? Thanks and regards. |
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