Journal
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
Volume 86, Issue -, Pages 139-147Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.ijthermalsci.2014.07.004
Keywords
Impinging multiple jet; Nusselt number; Sinusoidal jet; Intermittent jet; Convective heat transfer
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A numerical study has been conducted to seek an optimized arrangement of steady and pulsating impinging multiple submerged slot jets. A composite design consisting of steady as well as intermittent (on/off) or sinusoidal jets in different combinations of four slot jets was simulated. Effect of large temperature differences between jets and the impingement surface was examined by considering fluid properties to be dependent on temperature. In addition, the effect of frequency, phase angle for both types of pulsation as well as amplitude of the sinusoidal pulsing jets was examined on the time-averaged local Nusselt number distribution on an isothermal planar target surface. Results indicate that the combination of pulsed jets with steady jets provide the most uniform and enhanced Nusselt number distribution for the array of four jets. Furthermore, due to the alternating pulsating flow patterns, an increase in the convective heat transfer is observed around a secondary stagnation point. Significantly higher heat transfer can be obtained by the combinations of intermittent-steady jets rather than the sinusoidal-steady ones. (C) 2014 Elsevier Masson SAS. All rights reserved.
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