Hello,

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

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.