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Question 3 A Newtonian liquid in uniform film flow on the internal surface of a long vertical tube is contacted with a gas in upward
Question
A Newtonian liquid in uniform film flow on the internal surface of a long vertical tube
is contacted with a gas in upward counterflow.
i Demonstrate by clearly outlining any assumptions made in your analysis.
that the volumetric flowrate of the liquid can be described by:
where is the liquid film pressure gradient, the magnitude of the interfacial
frictional shear stress between the liquid and the gas which is assumed to be acting
vertically downwards ie: parallel with the direction of flow the film thickness, and
is the inner pipe diameter.
A liquid is admitted at a fixed rate of to the top of a vertical tube, in
internal diameter and in length. The liquid flows in a uniform thin film down the
internal surface of the tube. In normal operation the liquid film is in contact with a gas
in upward countercurrent flow.
ii Calculate the residence time of the liquid in the tube in the absence of any
gas flow.
iii Estimate the maximum allowable gas throughput if the residence time of
the liquid is not to exceed seconds.
You may assume that a constant friction factor of applies to the gasliquid
interface.
DATA:
Liquid properties:
Density kgm
Viscosity Nsm
Gas properties:
Density kgm
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