Film coefficient heat transfer

[H2Tran]

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.

 

[IRstuff]

"is acceptable?"

It's dependent on your design, which usually has constraints on volume and surface area, and the ambient environment, along with what flow rates and pressures you can generate with your gas.

TTFN

FAQ731-376
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[srfish]

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