EXPERIMENTAL INVESTIGATION ON COOLING EFFECT OF SPHERICAL DIMPLED PROFILE ALUMINUM BLOCK BY THE TAGUCHI METHOD
Abstract
Dimple profile plays a crucial role in enhancement of cooling process of various engineering application. This paper presents experimental investigation of convection heat transfer over spherical dimple on an aluminum block. In this study, an experimental investigation was carried out to observe the cooling effect under several conditions which are flow condition, dimple orientation, diameter of dimple, room temperature, air velocity, input of heat energy and condition of wind tunnel. A design of experiments technique was adopted in the form of orthogonal array L8 (23), Taguchi 2-Level approach. A total of 4 types dimpled surface are studied. The ANOVA results shows the room temperature is the major contributing factor towards rapid cooling process followed by wind tunnel condition, radius of dimple, air velocity, flow region and heat input. It was observed that the cooling time of 13 minutes can be achieved during laminar flow, 5 mm of dimple diameter, 60° angle of dimple orientation, 18 m/s of air velocity, 20 °C of room temperature.
Downloads
References
H.C. Pisal and A.A. Ranaware, “Heat transfer enhancement by using dimpled surface”, IOSR Journal of Mechanical and Civil Engineering, vol. 6, no. 54, pp. 07-15, 2013.
N. Vorayos, N. Katkhaw, T. Kiatsiriroat and A. Nuntaphan, “Heat transfer behavior of flat plate having spherical dimpled surfaces”, Case Studies in Thermal Engineering, vol. 8, pp. 370–377, 2016.
D. Zhang, L. Zheng, G. Xie and Y. Xie, “An experimental study on heat transfer enhancement of non-newtonian fluid in a rectangular channel with dimples/protrusions”, Journal of Electronic Packaging, vol. 136, pp. 021005-1-021005-10, 2014.
G.I. Mahmood, M.L. Hill, D.L. Nelson and P.M. Ligrani, “Local heat transfer and flow structure on and above a dimpled surface in a channel“, Journal of Turbomachinery, vol. 123, no. 1, pp. 115-123, 2001.
C.C. Beves, T.J. Barber and E. Leonardi, “An investigation of flow over two-dimensional circular cavity,” in 15th Australasian Fluid Mechanics Conference, Sydney, 2004, pp. 13-17.
G. Gadhave and P. Kumar, “Enhancement of forced convection heat transfer over dimple surface-review”, International Multidisciplinary e – Journal, vol. 1, no. 2, pp. 51-57, 2012.
A. Khalatov, A. Byerley, D. Ochoa and M. Seong-Ki, “Flow characteristics within and downstream of spherical and cylindrical dimple on a flat plate at low Reynolds numbers,” in ASME Turbo Expo: Power for Land, Sea, and Air, Vienna, 2004, pp. 589-602.
P.M. Ligrani, J.L. Harrison, G.I. Mahmood and M.L. Hill, “Flow structure and local Nusselt number variations in a channel with dimples and protrusions on opposite walls”, International Journal of Heat and Mass Transfer, vol. 44, no. 23, pp. 4413-4425, 2001.
T S. Griffith, L. Al-Hadhrami and J.C. Han, “Heat transfer in rotating rectangular cooling channels (AR=4) with dimples“, Journal of Turbomachinery, vol. 125, no. 3, pp. 555-563, 2003.
V.N. Afanasyev, Y.P. Chudnovsky, A.I. Leontiev and P.S. Roganov, “Turbulent flow friction and heat transfer characteristics for spherical cavities on a flat plate”, Experimental Thermal and Fluid Science, vol. 7, no. 1, pp. 1-8, 1993.
N. Katkhaw, N. Vorayos, T. Kiatsiriroat, Y. Khunatorn, D. Bunturat and A. Nuntaphan, “Heat transfer behavior of flat plate having 45 ellipsoidal dimpled surfaces“, Case Studies in Thermal Engineering, vol. 2, pp. 67-74, 2014.
M.K. Chyu, Y.Yu, H. Ding, J.P. Downs and F.O. Soechting, “Concavity enhanced heat transfer in an internal cooling passage,” in ASME International Gas Turbine and Aeroengine Congress and Exhibition, Orlando, Florida, 1997, pp. 437-444.
G.I. Mahmood and P.M. Ligrani, “Heat transfer in a dimpled channel: combined influences of aspect ratio, temperature ratio, Reynolds number, and flow structure“, International Journal of Heat Mass Transfer, vol. 45, no. 10, pp. 2011–2020, 2002.
G.N. Xie, B. Sunden and W.H. Zhang, “Comparisons of pins/dimples protrusions cooling concepts for an internal blade tip-wall at high Reynolds numbers”, Journal of Heat Transfer, vol. 133, no. 6, pp. 061902-1-061902-9, 2011.
J.S. Lawson and J. Erjavec, Modern Statistics for Engineering and Quality Improvement. Pacific Grove: Duxbury Press, 2000.
