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ISSN Online: 2379-1748

ISBN Flash Drive: 978-1-56700-483-0

ISBN Online: 978-1-56700-482-3

4th Thermal and Fluids Engineering Conference
April, 14–17, 2019 , Las Vegas, NV, USA

IMPACTS OF WATER QUALITY ON VIBRATION-INDUCED WATER DROPLET REMOVAL FOR COOLING TOWER WATER CAPTURE

Get access (open in a dialog) pages 607-616
DOI: 10.1615/TFEC2019.ewf.027533

要約

As the strain on the Energy-Water nexus grows, recovering water can be a way to reduce the need for freshwater use. Water can be recovered from industrial systems (e.g., cooling towers) by intercepting droplets or condensing water onto surfaces for collection. Through vibrating the surfaces, the process of collecting the liquid water can be expedited. Depending on the water quality of the recovered water, it can be either directly reused in a power production cycle or treated and recycled for a variety of uses, such as irrigation. The intent of this research was to determine if water quality had any significant impact on water droplet dynamics of samples on vertical, vibrating surfaces. This study tested de-ionized filtered water, a 0.465 Molar NaCl saltwater mixture (simulating seawater), Cooling Tower Blowdown (CTB) wastewater, and Flue Gas Desulfurization (FGD) wastewater. The CTB wastewater was taken from a cooling tower at Kansas State University and the FGD wastewater was recovered from Jeffrey Energy Center, a coal power plant near St. Marys, KS. The water samples were tested by placing 2 µL, 2.6-mm-diameter droplets of water on a vertical, hydrophobic surface using a pipette. The surface was then vibrated at a range of frequencies (i.e., 30 − 100 Hz) and amplitudes (i.e., 0.1 − 2.0 mm). Through both visual inspection and measurement of droplet velocities, it was found that the lower the viscosity and higher the surface tension is of the water, the faster the droplet will move. Therefore, it was shown that water quality has a modest impact on the behavior of droplets on vibrating surfaces.