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Journal of Enhanced Heat Transfer
IF: 0.562 5-Year IF: 0.605 SJR: 0.175 SNIP: 0.361 CiteScore™: 0.33

ISSN Print: 1065-5131
ISSN Online: 1026-5511

Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.2019029374
pages 513-534

EXPERIMENTAL INVESTIGATION ON HEAT TRANSFER AUGMENTATION IN HORIZONTAL TUBE USING COILED WIRE INSERTS

Madhu Sruthi Emani
Department of Mechanical Engineering, Indian Institute of Engineering Science and Technology, Shibpur, Howrah 711103, West Bengal, India
Abhik Nayak
Department of Mechanical Engineering, Indian Institute of Engineering Science and Technology, Shibpur, Howrah 711103, West Bengal, India
Achin Kumar Chowdhuri
Department of Mechanical Engineering, Indian Institute of Engineering Science and Technology, Shibpur, Howrah 711103, West Bengal, India
Bijan Kumar Mandal
Department of Mechanical Engineering, Indian Institute of Engineering Science and Technology, Shibpur, Howrah 711103, West Bengal, India
Sujoy Kumar Saha
Department of Mechanical Engineering, Indian Institute of Engineering Science and Technology, Shibpur, Howrah 711103,West Bengal, India

ABSTRACT

The increase in cost of energy and material has resulted in increased research for producing more efficient heat exchanging equipment. In this present work, the effects of coiled wire inserts with different cross-sections, on the heat transfer enhancement and friction factor characteristics of air flow through a horizontal pipe were studied. The experiment was conducted in a forced convection set-up using coiled wire inserts of different cross-sections, pitch, and thickness. The uniform heat flux condition was adopted for the turbulent flow, with Reynolds number (Re) ranging from 6400 to 15,200 and Prandtl number (Pr) being 0.7. The use of circular and square coiled wire inserts resulted in considerable increase in heat transfer as compared to a smooth tube at constant pumping power especially, at lower Reynolds number. The heat transfer augmentation ratio ranged from 1.6 to 2.9. The overall enhancement efficiency using coiled wires with square cross-section was about 10% more than that of coiled wires with circular cross-section for the same thickness and Reynolds number. A set of empirical correlations for Nusselt number and friction factor was also developed.

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