Wednesday, March 21st, 2018

Heat transfer and friction factor correlations of solar air heater ducts artificially roughened with discrete V-down ribs

Publication year: 2011brbSource:/b Energy, In Press, Corrected Proof, Available online 2 July 2011brSukhmeet, Singh , Subhash, Chander , J.S., SainibrThe heat and fluid flow characteristics of rectangular duct having its one broad wall heated and roughened with periodic ‘discrete V-down rib’ are experimentally investigated. Reynolds number (Re) has been varied from 3000–15000 with relative gap width (g/e) and relative gap position (d/w) range of 0.5–2.0 and 0.20–0.80 respectively. The respective variation in relative roughness pitch (P/e), angle of attack (α) and relative roughness height (e/Dh) have been 4–12, 30°–75° and 0.015–0.043. The effect of roughness parameters on Nusselt number (Nu) and friction factor (f) has been determined and the results obtained were compared with those of smooth duct. The maximum…br Highlights: ► Nu and f of discrete V-down rib-roughened solar air heater duct are investigated. ► There exist optimum P/e, d/w, α and g/e for which Nu and f are highest. ► Correlations developed for Nu and f predict values with reasonable accuracy.

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