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Old   April 14, 2004, 06:33
Default Flotran -distributed resitance
Zoltan Lakatos
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I'm doing a Flotran analysis and I have to model a cooler (for electric machines) with an air filter.The distributed resistance must be specified for the filter and I have the measured (pressure drop) vs (outlet velocity) diagram for the filter.How can I find from that the a and b coefficients for the friction factor f=a*(RE)**(-b)!? (From Darcy-Weisbach equation is possible to find the friction coefficient,but what is the hydraulic diameter and Reynolds-nr. in case of filters?) Has somebody experience using this method of specifying the distributed resistance?

Regards, Zoltan

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Old   April 14, 2004, 08:57
Default Re: Flotran -distributed resitance
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Trying is the best way. Change the parameter as long as the required pressure loss over the filter element is achieved.

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