PREDICTION OF NATURAL CONVECTION HEAT TRANSFER IN COMPLEX PARTITIONS CAVITY
Main Article Content
Abstract
A numerical investigation has been carried out to examine the effects of insulated baffle mounted in complex cavity representing as an industrial building on flow pattern and heat transfer characteristics. The cavity is formed by adiabatic horizontal bottom, inclined upper walls and vertical isothermal walls. This problem is solved by using flow-energy equations in terms of stream-vorticity formulation in curvilinear coordinates. Two cases are considered; in the first (case 1) the insulated baffle position attached to the horizontal bottom wall of the cavity while in the second case (case 2) the insulated baffle position attached the upper inclined wall. A parametric study is carried out using following parameters: Rayleigh number from 103 to 106, Prandtl number for 0.7 and 10, baffle height (HB=0, 0.3H*, 0.4H*, and 0.5H*), baffle location for (LB=0.25L and 0.75L) with or without baffle in the cavity (total of 100 tests). For case 1 results show that, the flow strength generally increasing with increasing Ra values, increasing baffle height, and decreasing values of Pr, while in case 2 the same behavior of above could be show except the flow strength decreasing with increasing baffle height, also, increase Ra leads to increase the rate of heat transfer. The configuration of the cavity in case 2 leads to increase in heat transfer rate comparing with that in case 1.
Article Details
Section
How to Cite
References
Amberite H., Kishinami K., Daimaruya M., Saitoh T., Takahashih H., and Suzuki J., “Laminar natural convection heat transfer in an air filled square cavity with two insulated baffles attached to its horizontal walls”, Jouornal of Thermal science and engineering, vol. 14,no. 3, 2006.
Ampofo F., "Turbulent natural convection in an air filled partitioned square cavity", Int. J. of Heat and Fluid Flow, 25(2004)103-114.
Bilgen E., “Natural convection in enclosures with partial partitions”, Journal of Renewable Energy, 26(2002)257-270.
Bilgen E., “Natural convection in cavities with a thin fin on the hot wall”, Int. J. Heat and Mass Transfer, 48(2005)3493-3505.
Dagtekin I., and Oztop H., “Natural convection heat transfer by heated partitions within enclosure”, Int. J. of heat and mass transfer, vol. 28, no. 6, 2006, pp.823-834.
Iyican L., Bayazitoglu Y., and Witte L.C. , “ An analytical study of natural convection heat transfer within a trapezoidal enclosure”, ASME . J. Heat transfer, 102(1980), 640-647.
Iyican L., Bayazitoglu Y., and Witte L.C. , “ An experimental study of natural convection in trapezoidal enclosure”, ASME . J. Heat transfer, 102(1980), 648-653.
Karyakin Y.E., “Transient natural convection in prismatic enclosures of arbitrary cross section”, Int. J. of heat and mass transfer, Vol. 32, no. 6(1989)1095-1103.
Jang J.H., Yan W.M., and Liu H.C., “Numerical convection heat and mass transfer a long a vertical wavy surface”, Int. J. of heat and mass transfer, 46(2003)1075-1083.
Law S.W., Gani R., and Symons J.G., “Experimental and numerical studies of natural convection in trapezoidal cavities”, ASME . J. Heat transfer, 111(1991), 372-377.
Lee T.S., “Numerical experiments with fluid convection in tilted nonrectangular enclosure”, Journal of Numerical heat transfer, A, vol. 10, (1991)487-499.
Moukalled F., and Darwish M., “Natural convection in a partitioned trapezoidal cavity heated from the side”, Journal of Numerical heat transfer, Part A-43(2003)543-563.
Peric M.,” Natural convection in trapezoidal cavities”, Journal of Numerical heat transfer, Part B-24(1993)213-219.
Shi, and Khodadi, “Laminar natural convection heat transfer in a differentially heated squre cavity due to a thin fin on the hot wall”, J. heat transfer
(2003)624.
Tasnim S.H., and Collins M., “Suppressing a natural convection in a differentially heated square cavity with an arc shaped baffle”, Int. J. of heat and mass transfer, 32(2005)94-106.
Thompson J. F., Bharat K. S., and Weatherill N. P., " Handbook of grid generation", 1999 by CRC Press LLC.
Van Doormaal J.P., Raithby G.D., and Strong A.B., “Predication of natural convection in non-rectangular enclosure using orthogonal curvilinear
coordinates”, Journal of Numerical heat transfer, 4(1981)21-38.