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film coefficient

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film coefficient [′film ‚kō·i‚fish·ənt]
(thermodynamics)
For a fluid confined in a vessel, the rate of flow of heat out of the fluid, per unit area of vessel wall divided by the difference between the temperature in the interior of the fluid and the temperature at the surface of the wall. Also known as convection coefficient.


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Film coefficients for in-tube evaporation of ammonia and R-502 with and without small percentages of mineral oil.
f] = effective surface film resistance, equal to R/3Kr, s Kr = mass transfer coefficient, also called film coefficient, m/s R = radius of spherical pellets, m h = depth of fixed bed, m m = ratio of void volume and solid volume (pellet volume) of the bed, namely, [[epsilon].
With higher heat transfer film coefficients the heat exchanger size can be reduced by as much as half over the size of a smooth tube unit.
 
 
 
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