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Journal of Enhanced Heat Transfer
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ISSN Imprimer: 1065-5131
ISSN En ligne: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.2015012449
pages 21-49

AN EXPERIMENTAL INVESTIGATION OF ENHANCED HEAT TRANSFER DUE TO A GAP IN A CONTINUOUS MULTIPLE V-RIB ARRANGEMENT IN A SOLAR AIR CHANNEL

Anil Kumar
Shoolini University
R. P. Saini
Alternate Hydro Energy Centre, IIT, Roorkee, Uttarakhand-247667, India
J. S. Saini
Mechanical and Industrial Engineering Department, IIT, Roorkee, Uttarakhand-247667, India

RÉSUMÉ

This work is concerned with the experimental investigation of a multi V-rib with a gap of solar air channel based on thermal as well as hydraulic performance. The rib produced on the heated plate forms the wetted side of an upper broad wall of the solar air channel. Experimentation was carried out on 41 sets of roughened surfaces having different sets of values of roughness geometry parameters to collect heat transfer and friction data. The data have been presented in the form of variation of Nu/Nus and f/fs as a function of rib parameters of artificial roughness. The e/D was varied from 0.022 to 0.043, Gd/Lv was varied from 0.24 to 0.80, g/e was varied from 0.5 to 1.5, α was varied from 30° to 75°, P/e was varied from 6.0 to 12.0, and W/w was varied from 1.0 to 10.0. It has been found that the values of thermo-hydraulic performance parameter increase with increase in Re and become almost asymptotic in the higher range of Re. The absolute maximum value of thermal as well as hydraulic performance parameter has been found to be higher corresponding to e/D of 0.043, W/w of 6.0, Gd/Lv of 0.69, g/e of 1.0, α of 60°, and P/e of 8.0. Multiple V-rib with gap solar air channel with e/D of 0.043, W/w of 6.0, Gd/Lv of 0.69, g/e of 1.0, α of 60°, and P/e of 8.0 has better thermal as well as hydraulic performance as compared to other rib shapes investigated by various investigators under similar operating conditions.


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