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Technical Brief

An Experimental Study of the Collection of Fog Droplets Using a Mesh Fabric: Possible Application to Cooling Towers

[+] Author and Article Information
D. S. Sontag, J. R. Saylor

Department of Mechanical Engineering,
Clemson University,
Clemson, SC 29634-0921

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received July 23, 2015; final manuscript received October 10, 2015; published online December 1, 2015. Assoc. Editor: Mohamed A. Habib.

J. Energy Resour. Technol 138(2), 024501 (Dec 01, 2015) (4 pages) Paper No: JERT-15-1277; doi: 10.1115/1.4031969 History: Received July 23, 2015; Revised October 10, 2015

An experimental study is presented of the ability of fine meshes to remove fog drops from an air flow. Specifically, the collection efficiency (CE) was measured for fog drops passing through mesh fabrics. Meshes composed of cotton, nylon, and Teflon were investigated, and the effect of the material as well as mesh porosity was determined. Collection efficiencies ranging from 5% to 50% were obtained. The ultimate goal of this work is to employ such meshes in a parachute configuration above power plant cooling towers, so that condensed fog may be collected and returned to the cooling loop. It is shown that the drop diameters and velocities investigated here are similar to those observed above cooling towers.

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Figures

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Fig. 1

Experimental setup

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Fig. 2

Humid air generator

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Fig. 3

Sample grayscale images of nylon, cotton, and Teflon meshes

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Fig. 4

Thresholded versions of the grayscale images presented in Fig. 3

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Fig. 5

Drop size distribution for fog drops generated in the drop generation container

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Fig. 6

Averaged CE versus ϕ for each material tested

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Fig. 7

Average CE versus pressure drop across the mesh

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Fig. 8

CE scaled to pressure drop versus pressure drop, presented on log–log coordinates

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