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强化传热期刊
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ISSN 打印: 1065-5131
ISSN 在线: 1026-5511

强化传热期刊

DOI: 10.1615/JEnhHeatTransf.v12.i4.70
pages 385-394

Heat Transfer in Turbulent Flow Through Tube with Wire-Coil Inserts

Sarkar Rashid
ME dept
M. Zaidul Islam
Department of Mechanical Engineering, Chittagong University of Engineering ƃ Technology, Chittagong, Bangladesh
M. A. Islam
Department of Mechanical Engineering, Bangladesh University of Engineering & Technology, Dhaka, Bangladesh

ABSTRACT

An experimental investigation has been carried out to study the pressure drop and turbulent flow heat transfer to air in a tube with wire-coil inserts with a varying pitch. Four test sections with four mild steel wire coils of different pitches (P = 12, 24, 40, and 50 mm with corresponding helix angles, α = 10, 20, 35, and 450°) were fabricated. Air velocity, air inlet and outlet temperatures, local wall temperature, local coil-surface temperature, and the pressure drop were collected for tubes with wire-coil-inserts to analyze the friction factor, the Nusselt number, the heat-transfer coefficient, and the heat transfer effectiveness. The results indicated that as much as two-fold improvement might be obtained in the turbulent flow heat-transfer coefficient and the heat transfer effectiveness. A correlation was also developed for prediction of the heat-transfer coefficient in turbulent flow for tubes with wire-coil-inserts.


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