How To Design Compact Mass Transfer Packing
For Maximum Efficiency
Author(s)
H. Goshayshi
Abstract
The effect of form with corrugated packing on mass transfer and pressure drop
characteristics in atmospheric cooling towers has been studied experimentally.
The results showed that the mass transfer coefficient decreased with increase in
packing pitch and increase in the ratio of rib pitch to rib height. Friction factors
were expressed by a dimensional equation which included pitch and distance
between the packings, for both smooth and rough surface. From these results, the
relationship between packing mass transfer coefficient and pressure drop was
deduced. The correlations were verified with additional experimental data taken
with 1.1< P/D <1.70 and 1 ≤ p/e ≤ 5. This provides a useful semi-experimental
relation, in the area generally lacking in design and performance data.
Keywords: packings, mass transfer and pressure drops.
1 Introduction
In general, the design of an efficient, compact mass transfer pack for gas/liquid
applications is based on the optimisation of the passage diameter and passage
length. Also from a number of recent studies it is apparent that the choice of
material plays a major role in packing design, the ideal material being highly
formable in order to provide a high specific surface area, Egberongbe [3]. Heat
and mass transfer between a falling liquid film along a vertical wall and upward
flowing air contacting directly with the film is an important and interesting
phenomenon in industrial apparatus such as cooling towers. While 96% of the
cooling towers use PVC packing with smooth and cross ribbing, no data on the
flow of liquid over a flat vertical wall with cross ribbing have been published.
Only some of the features of their operation in contact heat exchangers have
Keywords
packings, mass transfer and pressure drops.
Related Book
Other papers in this volume
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