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Heat Pipe Science and Technology, An International Journal

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

Heat Pipe Science and Technology, An International Journal

DOI: 10.1615/HeatPipeScieTech.2014010573
pages 197-216

THE EFFECT OF HEAT PIPE TRANSVERSE SPACING UNDER FORCED-CONVECTION TO NATURAL-CONVECTION FLOW CONDITIONS

Lik Fang Sim
Mechanical and Industrial Engineering Department, Qatar University, Doha, Qatar
Ben Richard Hughes
School of Civil Engineering, University of Leeds, Leeds LS2 9JT, United Kingdom
Hassam Nasarullah Chaudhry
School of Energy, Geoscience, Infrastructure and Society, Heriot-Watt University, P.O.Box: 294345, Dubai, United Arab Emirates
John Kaiser Calautit
School of Civil Engineering, University of Leeds, Leeds LS2 9JT, United Kingdom
Saud Abdul Ghani
Mechanical and Industrial Engineering Department, Qatar University, Doha, Qatar

ABSTRACT

The rate of heat transfer and friction factor of heat pipe arrays with transverse spacings between 44 and 52 mm was numerically and experimentally investigated. A total of 19 wickless copper heat pipes with water as the working fluid were used in this study. A forced-convection to natural-convection setup was used on the heat pipe evaporator to condenser cycle. The numerical simulation showed that the rate of heat transfer increases in line with a transverse spacing increase until it reaches its optimum spacing. A reduction in flow movement (mechanical power) is required for larger transverse spacings due to the lower flow resistance caused by the heat pipes. The results from the study show that the heat flux can improve by up to 14% by optimizing the transverse spacing. The heat pipe optimum transverse spacing was determined in this study at a spacing to diameter ratio of 3.1.