(a)
Interpretation:
The average thickness of the liquid film flowing down over the pieces of packing is to be determined.
Concept Introduction:
The thickness mentioned here is the total thickness which a liquid layer makes for a given type of flow. Averaging it will give the average thickness of the layer.
The average thickness is thus given as,
The notations used here are,
g = Acceleration due to gravity
The liquid loading is given as,
b = Breadth of layer in direction perpendicular to the plane
(b)
Interpretation:
The fraction of the column volume taken up by the liquids is to be determined.
Concept Introduction:
The fraction of the volume in the column taken up by the liquid is called the liquid holdup and it is given by the product of the film thickness and the area per cubic volume.
Liquid Holdup =
(c)
Interpretation:
The average thickness of the liquid film for half wetted total packing surface is to be determined.
Concept Introduction:
The fraction of the volume in the column taken up by the liquid is called the liquid holdup and it is given by the product of the film thickness and the area per cubic volume.
Liquid Holdup =
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Unit Operations of Chemical Engineering
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