LAMINAR NATURAL CONVECTION HEAT TRANSFER BETWEEN DUCTED PARALLEL PLATES
Main Article Content
Abstract
Laminar natural convection heat transfer to air flow in a ducted two parallel plates subjected to same constant heat flux has been studied experimentally. In this study a test rig has been designed and constructed to allow studying the effect of plate spacing and plates angle of inclination on the heat transfer process. The study covers three plate spacing 15 mm, 35mm and 60 mm that makes plate aspect ratio (AR) 24, 10.285 and 6, The heat flux implemented in all test runs varies between 55 W/m2– 340 W/m2 that makes the modified Rayleigh number (Ra) varies from 105-108. Experimental results presented as plate temperature distribution, variation of local heat transfer coefficient and the relation between Nu and Ra, reveal for the range of parameters mentioned above, an improvement in heat transfer process as the AR values change from 6 to 24 and the improvement rates is higher for the lower heat flux test (lower Ra). A correlation of the results were made in the form of Nuvr (Gr/AR) in which the effect of duct aspect ratio (AR) has been introduced.
Article Details
Section
How to Cite
References
Aung. W., 1972, "Fully Developed Laminar Free Convection Between Vertical Plates Heated Asymmetrically", International Journal of Heat and Mass Transfer, vol. 15, pp. 1577-1580.
Aung, W., Fletcher, L. S., and Sernas, V., 1972, "Developing Laminar Free convection Between Vertical Plates With Asymmetric Heatign", International Journal of Heat and Mass Transfer, Vol. 116, pp. 2293-2308.
Bar-Cohen, A., and Rohsenow, W. M., 1984, "Thermally Optimum Spacing of Vertical, Natural Convection Cooled, Parallel Plates", ASME Journal of Heat Transfer, Vol. 106, pp. 116-123.
Bodoia, J. R., and Osterie, J. F., 1962, "The Development of Free Convection Between Heated Vertical Plates", ASME Journal of Heat Transfer, Vol. 84, pp. 40-44.
Elenbass, W., 1942, "Heat Dissipation of Parallel Plates by Free Convection", Physica, Vol. 9, pp. 1-23.
Incropera, f. P., ed., 1968, "Research Needs in Electronic Cooling", Proceedings of a workship sponsored by the National Science Foundation and Purdue University, Andover, MA.
Miyatake, O., Fukii, T., Fujii, M., and Tanaka, H., 1973. "Natural Convective Heat Transfer Between Vertical Parallel Plates-One Plate With a Uniform Heat Flux and the Other Thermally Insulated", Heat Transfer-Japanese Research, Vol. 4, pp. 25-33.
Raithby, G. D., and Hollands, K. G. T., 1975, "A General Method of Obtaining Approximate Solutions to Laminar and Turbulent Free Convection Problems, "in: Advances in Heat Transfer, T. F. Irvne, Jr. and J. P. Hartnett, eds., Vol. 11, pp. 265-315.
Sparrow, E. M., and Bahrami, P. A., 1980, "Experiments on Natural Convection From Vertical Parallel Plates With Either Open or Closed Edges", ASME Journal of Heat Transfer, Vol. 102, pp. 221-227.
Sparrow, E. M., and Gregg, J. L., 1956, "Laminar Free convection From a Vertical Plate With Uniform Surface Heat Flux," Trans. ASME, Vol. 78, pp. 435-440.
Wirtz, R. A., and Stutzman, R. J., 1982, "Experiments on Free Convection between Vertical Plates with Symmetric Heating," ASME Journal of Heat Transfer, Vol. 104, pp. 501-507.