# Calculating dx when there is aspect ratio

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 November 14, 2013, 11:04 Calculating dx when there is aspect ratio #1 New Member   maziyar Join Date: Nov 2013 Posts: 1 Rep Power: 0 Sponsored Links HI At the end of Suhaz V . Patankar Numerical heat transfer book there is T-teach computer program that for calculatig first dx has calculating below: sumx=0.5*expfac**(n-4)+(expfac**(n-3)-1.0)/(expfac-1.0)+0.5 dx=altot/sumx expfac=expansion factor n= number of cells in x direction altot=for example length of pipe if expansion factor is assuming 1.2 then each dx should greater than previous cell and it's equal to dx*expfac. in that case we have series: dx=(1+expfac+expfac**2+expfac**3+...+expfac**n)/altot i don't understand the origin of first the formula with red colour please help me? khaled.ebraheem likes this. Last edited by maziyarx; November 14, 2013 at 18:27.

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