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Film coefficient heat transfer

Film coefficient heat transfer

Film coefficient heat transfer

(OP)
Hi everybody,
I am going to design an Air cooler for cooling hydrocarbon gas:
Cooling from temperature 160C (100% vapor phase) to temperature 45C (90% vapor phase).
1.  I want to calculate the tube-side Film coefficient heat transfer for gas, can I use this equation for gas service? (Chap 13, John Campbell's Gas Conditioning and Processing, Vol II)

h= A * (k/d) *(d*v*roh/mew)^a * (Cp*mew/k)^b


h = film coefficient, W/(m2.K)
A = proportionaliy constant
k = fluid thermal conductivity, W/(m.K)
d = tube inside diameter, m  
v = fluid velocity, m/s
roh = fluid density, kg/m3
Cp = fluid specific heat capacity, kJ/(kg.K)
mew = fluid viscosity, kg/(m.s)
a = coefficient on Reynolds No.
b = coefficient on Prandtl No

2. And what value's range of film coefficient for gas is acceptable?

Thanks in advanced,
Hai.

RE: Film coefficient heat transfer

You can use the gas equation but with 10% condensation you will be conservative. This is especially true if the condensate is water.

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