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ISSN Druckformat: 1065-5131
ISSN Online: 1563-5074
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EXPERIMENTAL INVESTIGATION ON HEAT TRANSFER AUGMENTATION IN HORIZONTAL TUBE USING COILED WIRE INSERTS
ABSTRAKT
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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