Investigation of surface water behavior during glaze ice accretion

Hansman, R. John and Turnock, Stephen R. (1989) Investigation of surface water behavior during glaze ice accretion. Journal of Aircraft, 26 (2), 140-147. (doi:10.2514/3.45735).

Record type: Article

Abstract

A series of experimental investigations that focused on isolating the primary factors that control the behavior of unfrozen surface water during glaze ice accretion were conducted. Detailed microvideo observations were made of glaze ice accretions on 2.54 cm diam cylinders in a closed-loop refrigerated wind tunnel. Distinct zones of surface water behavior were observed; a smooth wet zone in the stagnation region with a uniform water film, a rough zone where surface tension effects caused coalescence of surface water into stationary beads, and a zone where surface water ran back as rivulets. The location of the transition from the smooth to the rough zone was found to migrate towards the stagnation point with time. Comparative tests were conducted to study the effect of the substrate thermal and roughness properties on ice accretion. The importance of surface water behavior was evaluated by the addition of a surface tension reducing agent to the icing tunnel water supply, which significantly altered the accreted glaze ice shape. Measurements were made to determine the contact angle behavior of water droplets on ice. A simple multizone modification to current glaze ice accretion models was proposed to include the observed surface roughness behavior.

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Published date: 7 February 1989

Additional Information: Funding Information: This work was supported in part by NASA and the Federal Aviation Administration under Grants NAG-3-666 and NGL- 22-009-640. The work was also supported by the National Sci-ence Foundation Presidential Young Investigators Program, Award No. 8552702. Use of the icing wind-tunnel facility was provided courtesy of Data Products of New England, and pho- tographic data were provided by Dr. William Olsen of the NASA Lewis Research Center. Copyright: Copyright 2016 Elsevier B.V., All rights reserved.