- #1
Ian Limjap
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Homework Statement
Water flowing at the rate 3.5 kg s−1 through a tube with an inner diameter of 2 cm is to be heated from 20 to 40◦C. If the tube wall temperature is maintained at 90◦C, determine the length of the tube required.
Homework Equations
Q'=Cp*m*(DeltaT)
Q=2*pi*r*L*Q'
The Attempt at a Solution
Q=mass flowrate*Cp(DeltaT)
=3.5*4.18*10^3*(40-20)=292600J/s
L=Q/2*pi*rQ'
However, I'm missing Q and L.
I would like to know if I need the prandlt number for this question or the viscosity of water? Would I need more information to solve this problem?
Any help will be greatly appreciated.
Thanks.
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