Analysis of Evaporation Data under Roughness-Induced Wind Flow
Publication: Journal of Hydrologic Engineering
Volume 18, Issue 6
Abstract
Roughness-induced wind flow is commonly encountered around water bodies. It is well known that wind velocity enhances evaporation. However, the way this enhancement takes place in roughness-induced flow has been less explored. In this paper, a set of 200 data of an experimental investigation of the evaporation rates of water under forced convection conditions created by roughness elements from a circular pan fitted in the bottom wall of a wind tunnel test section are analyzed. The range of parameters used in this work are as follows: pan water temperature 30–50°C, wind velocity , and relative roughness height 0.011–0.075. Evaporation rates are related as a function of the vapor pressure differential, wind velocity, and relative roughness height of the obstructions introduced in the upstream of the air flow. It is found that evaporation rates are a nonlinear function of the relative roughness height, and evaporation estimates can contain a large error if such roughness-induced effects are neglected.
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Information & Authors
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Published In
Journal of Hydrologic Engineering
Volume 18 • Issue 6 • June 2013
Pages: 665 - 674
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Nov 13, 2011
Accepted: May 22, 2012
Published online: May 25, 2012
Published in print: Jun 1, 2013
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