Npr is a dimensionless group important in heat transfer calculations. it is defi

Question

Npr is a dimensionless group important in heat transfer calculations. it is defined as Cpu/k, where Cp is the heat capacity of a fluid, u is the fluid viscosity, and k is the thermal conductivity. For a particular fluid Cp = 0.583J/(g.Cdegrees), k = 0.286 W/(m. degreesC), and u = 1936 lbm/(ft.h). Estimate the vlaue of Npr without using a calculator (remember it is dimensionless), showing your calculations; then determine it with a calculator.

I have no idea where to even start with this problem if you can explain step by step i would really appriciate it!!

Explanation / Answer

u = 1936 x (0.454) /(0.3048 x 3600) = 0.8 kg/ms

now Npr = 0.583 x 0.8/0.286 = 1.633,

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