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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

NUMERICAL PREDICTIONS OF TRANSIENT COOLING AND PHASE CHANGE OF A FALLING WATER DROPLET IN SUB-ZERO AIR TEMPERATURES

Kaniz Ronak Sultana
Department of Mechanical Engineering, Memorial University of Newfoundland, Canada

Kevin Pope
Memorial University of Newfoundland

Yuri S. Muzychka
Department of Mechanical Engineering, Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John's, NL, A1B 3X5, Canada

Abstract

In this paper, transport phenomena and phase change of droplets are investigated for marine icing applications. In Arctic and Sub-arctic regions, the sea spray generated by ship-wave interactions is a major cause of vessel icing. The spray is carried by the wind until it impacts a structure. During the flight, a complex heat transfer process between the droplet and the environment affects the droplet conditions when impacting a vessel. This paper uses numerical methods to develop a two-dimensional axisymmetric air-water multiphase model, where a freely falling droplet is investigated. The effects of droplet’s interior motion, temperature distribution, and the phase change with respect to the sub-zero environmental condition are examined. Fresh and salt water (with constant and variable properties) are considered in this model. This study provides new insights on droplet dynamics associated with droplet shape and motion, as well as the solidification and nucleation processes.

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