EXPERIMENTAL STUDY OF THE NATURAL CONVECTION HEAT TRANSFER FROM HORIZONTAL,INCLINED,AND VERTICAL HOLLOW PLATE AT CONSTANT HEAT FLUX | ||
Journal of University of Anbar for Pure Science | ||
Article 24, Volume 1, Issue 1, April 2007, Pages 123-133 PDF (570.15 K) | ||
Document Type: Research Paper | ||
DOI: 10.37652/juaps.2007.15532 | ||
Author | ||
SAAD M.J. AL-AZAWI* | ||
Department of Mechanical Engineering - College of Engineering - University of Anbar | ||
Abstract | ||
Experimental investigation was carried out to study the effect of a hollow and inclination angles on the ability of a square flat plate squander the convective heat transfer. An experimental set-up of an uniformly heated Aluminum flat plate of a centerial hollow representing 0.25 of the entire surface area of the plate heated by a constant heat flux was used basically for this purpose. Experiments were performed for inclination angles of (0o,15o, 30o, 45o, 60o,75o, 90o)for a region of Rayleigh number between ( 151550-1616000).This study showed that the ability of the surface to dissipate heat was presented by the average Nusselt number as a function of Rayleigh number depending on the existence of the hollow and the inclination angle. The existing of the hollow increased the value of average Nusselt number up to (39%) in the horizontal state and change sequentially with the inclination angle and it reached the maximum value of (48%) at the angle (75o) and (22%) as a average for all the inclination angles under test as compared with the horizontal state of the present hollow surface and reached (59%) with the unhollow inclination surfaces. | ||
References | ||
[1] Cheng P., Zhao, T. S.(1999)"An experimental study of natural convection heat transfer in horizontal plate" Department of mechanical engineering university of Hawaii U.S.A vol.13: pp(517-521).
[2] Chen, T.S.Tien, H.C and Armaly, B.F (1986) “Natural Convection On Horizontal, Inclined, and Vertical Plated With Variable Surface Temperature or Heat Flux“ Int. J. Heat Transfer,Vol.29:pp. (1465-1478),.
[3] AL-Arabi, M. And Saker,B. (1988) “Natural Convection Heat Transfer From Inclined Isothermal Plates“ Int. Heat and Mass Transfer ,Vol. 31:pp.(559-566) ,.
[4] Vliet, G. C. and Ross, D. C. (1975) “Turbulent natural convection on upward and down ward facing inclined constant heat flux surfaces” J. of Heat Transfer, Nov: pp.(549-555),
[5] Churcill, S. W. And Chu, H. H. S. (1975) “Correlating Equations For Laminar And Turbulent Free Convection From A Vertical Plate“ Int. J. Heat And Mass Transfer, Vol.18: pp. (1323-1329).
[6] احمد وحید مصطفى، (2001)"دراسة عددیة وعملیة لانتقال الحرارة بالحمل الحر من قرص وحلقات"أطروحة ماجستیر،هندسة المکائن والمعدات،الجامعة التکنولوجیة،بغداد [7] الخفاجی .رفاه عزیز نجم(2002) "منظومة تعلیمیة لدراسة انتقال الحرارة بالحمل الحر من سطوح مستویة أفقیة مربعة الشکل عند ثبوت درجة الحرارة"قسم التعلیم التکنولوجی،الجامعة التکنولوجیة،بغداد [8] Sahraoui, M., Kaviany, M., and Marshall, H. (1990) “Natural Convection From Horizontal Disks And Rings “ASME J. Heat Transfer, Vol. 112: pp. (110-116).
[9] Yousef, W.W., Tarasuk, J. D.and Mckeen, W.J.,(1982)“FreeConvection Heat Transfer From Upward-Facing Isothermal Horizontal Surfaces”. ASME J. Heat Transfer, Vol.104:pp. (493-500).
[10] Robinson S. B., Liburdy J. A. (1987)“ Prediction of the Natural Convection heat Transfer from a horizontal heated disk “ASME J. Heat Transfer, Vol.109 pp.(906-911).
[11] William J. Mcguinness, Benjamin SteinJohns, Reynolds (1998)"Mechani-cal and electrical equipment for buildings" sixth ed., America.
[12] Yunus, A., Cengl, (1998) “Heat Transfer A Practical Approach“ McGraw–Hill.
[13] Kreith, F., bohn, M., "Principles of heat transfer" Fifth ed. (1997). | ||
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