Senol BASKAYA, Ayla DOGAN, Mecit SIVRIOGLU

Numerical investigation of heat transfer from heat sources placed in a horizontal rectangular channel

In this study, three dimensional mixed convection heat transfer from discrete heat sourcesplaced in a horizontal rectangular channel has been investigated numerically. 8x4 flushmounted discrete heat sources were mounted on the lower and upper surfaces of the channel.Air is used as working fluid (Pr0.7). The heaters at the bottom and at the top wall were keptat a constant heat flux. Side walls, upper and lower walls are insulated and consideredadiabatic. Nusselt number distributions and the effect of the Grashof number (5.8x106≤ Gr* ≤2.3x107) and Reynolds number (150 ≤ Re ≤ 971) on the buoyancy-driven secondary flow havebeen investigated. Distributions of velocity vectors and temperature contours have beendetermined by the numerical method, and the results have been presented in detail. Governingequations were solved by the control volume method using suitable boundary conditions. Thenumerical parametric study was made for aspect ratio of AR=8, at various Reynolds andGrashof numbers.

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[1] Kennedy K. J., Zebib A., Combined free and forced convection between horizontal parallel planes: some case studies, Int. J. Heat Mass Transfer., 26 (1983) 471–474.
[2] Incropera F. P., KerbyJ. S., Moffatt D. F., Ramadhyani S., Convection heat transfer from discrete heat sources in a rectangular channel. Int. J. Heat Mass Transfer., 29 (1986) 1051– 1058.
[3] Choi C. Y., Ortega A., Mixed convection in an inclined channel with a discrete heat source, Int. J. Heat Mass Transfer., 36 (1993) 3119–3134.
[4] Mahaney H. V., Ramadhyani S., Incropera F. P., Numerical simulation of three-dimensional mixed convection heat transfer from anarray of discrete heat sources in a horizontal rectangular duct., Numer. Heat Transfer., 16 (1989) 267– 286.
[5] Dogan A., Sivrioglu M., Baskaya S., Experimental investigation of mixed convection heat transfer in a rectangular channel with discrete heat sources at the top and at the bottom, Int. Commun. Heat Mass Transfer., 32 (2005) 1244–1252.
[6] Özsunar A., Başkaya Ş., Sivrioğlu M., Numerical analysis of Grashof number, Reynolds number inclination effects on mixed convection heat transfer in rectangular channels, Int. J. of Comm. Heat Mass Transfer., 28 (2001) 985-994.
[7] Amirouche Y., Bessaїh R., Numerical simulation of laminar mixed convection aircooling from an array of heated electronic components mounted in a vertical channel, International Renewable Energy Congress November 5-7, – Sousse, Tunisia., (2010) 268- 275,
[8] El Alami M., Najam M., Semma E., Oubarra A., Penot F., Electronic components cooling by natural convection in horizontal channel with slots, Energy Conversion and Management., 46 (2005) 2762–2772.
[9] Doğan A., Oney B., Experimental investigation of convection heat transfer from aluminum foam heat sinks, Journal of the Faculty of Engineering and Architecture of Gazi University, 29 (2014) 71-78.
[10] Doğan A., Özbalcı O., Experimental Investigation of Free Convection from Foam Heat Sinks in an Inclined Rectangular Channel, Cumhuriyet Sci. J., 39 (2018) 756- 765.
[11] Dogan A., Investigation of mixed convection heat transfer from a rectangular cross-section channel with discrete heat sources at the top and at the bottom, Ph.D. Thesis, Gazi University, Ankara, Turkey, (2003).
[12] Rosten H., Spalding D. B., The PHOENICS Beginners Guide, London: CHAM 1. Ltd, 1987.
[13] Spalding D.B., The PHOENICS Encyclopedia, London: CHAM Ltd, 1994.