Calculating dx when there is aspect ratio
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:
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:
i don't understand the origin of first the formula with red colour please help me?
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