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[ankur2061]

Dear All,

In engineering texts it is most common to find graphs/charts for solving problems in fluid flow, hea transfer and mass transfer. Many a times reading a value of a graph/chart is a trying experience, specifically if it is not a value which exactly lies on a curve shown on the abscissa & ordinate. Since these graphs are generated from some kind of an equation, I have wondered why authors of engineering texts can't provide the equations that have generated these graphs. It would make life much simpler for engineers trying to do calculations using equations rather than reading a value from a chart erroneously.

To be specific, I was looking to find out the equations related to the following graphs/charts in GPSA engineering databook:

Volume Fraction Liquid (lambda) versus two-phase friction factor ratio

Volume Fracion Liquid versus liquid hold faction (H_Ld) (Dukler)

Graphs/Charts can easily generated from an equation but generating a correct equation from a graph/chart is quite a difficult task.

I wish engineering academicians world over would take a note of this and do the needful.

All are welcome to share their thoughts.

Regards,
Ankur.