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Heat Pipe Science and Technology, An International Journal

ISSN Print: 2151-7975
ISSN Online: 2151-7991

Archives: Volume 1, 2010 to Volume 8, 2017

Heat Pipe Science and Technology, An International Journal

DOI: 10.1615/HeatPipeScieTech.v5.i1-4.150
pages 161-167

VISUAL STUDY OF FLUID DYNAMICS IN WICKLESS TRANSPARENT HEAT PIPES

Kate Smith
Department of Mechanical & Manufacturing Engineering, Trinity College
Samuel Siedel
Department of Mechanical & Manufacturing Engineering, Trinity College
Anthony J. Robinson
Department of Mechanical and Manufacturing Engineering, Parsons Building, Trinity College, Dublin, Ireland; and Department of Mechanical Engineering, McMaster University, Hamilton, Ontario, Canada
Roger Kempers
York University

ABSTRACT

Though heat pipes are recognized as viable heat transfer devices for many different applications, the thermal mechanisms driving the heat transfer are still not fully understood. By fabricating and testing a fully transparent, sapphire heat pipe, with water as the working fluid, the dominant mechanisms of boiling and condensation were visualized. The results of this investigation suggest that for low operating pressures there is a complex geyser boiling regime occurring in the evaporator section at lower powers (~20 W). Through all power levels slugs of water and plugs of vapor were observed, similar to a pulsating heat pipe. The regime shifted towards more explosive boiling at higher powers (~70 W). These phenomena were observed using high speed imaging and the corresponding local temperature data.


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