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to calculate alpha and beta

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Old   November 9, 2005, 00:54
Default to calculate alpha and beta
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I am modelling a Shell and tube heat exchanger shell side (1 Shell pass, 2 tube pass).I am modelling tubes as porous medium.Can any one help me in calculating alpha and beta values correctly?????

Thanks in advance
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Old   November 9, 2005, 01:50
Default Re: to calculate alpha and beta
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you need to get the pressure drop vs velocity data from somewhere (prob. expt) for the system. Then fit a second order polynomial in the data to get 'alpha and 'beta' as

y = alpha*x^2 + beta*x

where, y = pressure drop and x = velocity.
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