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Design and Calibration of a High Volume Fogwater Collector

Gerald PadeUniversity of Washington, Department of Civil Engineering, Seattle, WA 98195

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David CovertUniversity of Washington, Department of Civil Engineering, Seattle, WA 98195

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Timothy LarsonUniversity of Washington, Department of Civil Engineering, Seattle, WA 98195

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Abstract

An inertial impactor is described that is designed to actively collect fog droplets from a flowing airstream. This collector samples 60 liters of air per second with a theoretical d50 currently set at 8 μm. Collector performance was assessed by generating a known number of 22 and 44 μm water droplets tagged with 1 ppm sodium fluorescein and injecting these droplets into a larger flow of polydisperse, untagged droplets immediately upstream of the collector. These large, chemically tagged droplets were found to be collected with 90% efficiency, in good agreement with theoretical estimates of collector performance. Between 3 and 8% water loss via evaporation was observed for relative humidities between 93% and 88%, respectively.

Abstract

An inertial impactor is described that is designed to actively collect fog droplets from a flowing airstream. This collector samples 60 liters of air per second with a theoretical d50 currently set at 8 μm. Collector performance was assessed by generating a known number of 22 and 44 μm water droplets tagged with 1 ppm sodium fluorescein and injecting these droplets into a larger flow of polydisperse, untagged droplets immediately upstream of the collector. These large, chemically tagged droplets were found to be collected with 90% efficiency, in good agreement with theoretical estimates of collector performance. Between 3 and 8% water loss via evaporation was observed for relative humidities between 93% and 88%, respectively.

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