Browse > Article

Pressure Loss and Enhancement of Heat Transfer in an Annulus Filled with Aluminum Foam  

Noh, Joo-Suk (Department of Air Conditioning & Refrigeration, Kyonggi Institute at Technology)
Han, Young-Hee (School of Mechanical Engineering, Chungbuk National University)
Lee, Kye-Bock (School of Mechanical Engineering, Chungbuk National University)
Lee, Chung-Gu (School of Mechanical Engineering, Chungbuk National University)
Publication Information
International Journal of Air-Conditioning and Refrigeration / v.15, no.1, 2007 , pp. 17-24 More about this Journal
Abstract
An experimental investigation was carried out for 4 different types of the aluminum foam heat sinks which were inserted into the annulus. The purpose of this study is to examine the feasibility of a heat sink with high performance forced convective water cooling in the annulus. The local wall temperature distribution, inlet and outlet pressures and temperatures, and heat transfer coefficients were measured for heat flux of 13.6, 18.9, 25.1, 31.4 $kW/m^2$ and Reynolds number ranged from 120 to 9,000. Experimental results show that the departure from the Darcy's law is evident from the pressure loss and the friction factor is much higher while the significant enhancement in Nusselt number is obtained, and average Nusselt number of aluminum foam with high pore density is much higher than that of aluminum foam with low pore density. Correlations for the friction factor is proposed and used for design of thermal applications.
Keywords
Aluminum foam; Annulus; Non-Darcy flow; Friction factor; Nusselt number;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Sparrow, E. M. and Loeffler, J. R., 1959, Longitudinal laminar flow between cylinders arranged in regular array, AIChE, Vol. 5, pp. 325-329   DOI
2 Vafai, K. and Tien, C. L., 1980, Boundary and Inertia effects on convective mass transfer in porous media, Int. J. Heat Mass Transfer, Vol. 25, No.8, pp. 1183-1190
3 Koh, J. C. Y. and Stevens, R. L., 1975, Enhancement of cooling effectiveness by porous materials in coolant passage, J. of Heat Transfer, Transactions of ASME, pp. 309-311
4 Heaton, H. S., Reynolds, W. C. and Kay, W. M., 1964, Heat transfer in annular passages, Simultaneous development of velocity and temperature fields in laminar flow, Int. J. Heat Mass Transfer, Vol. 7, pp.763-781   DOI   ScienceOn
5 Kline, S.J. and McClintock, F. A., 1953, Describing uncertainties in single sample experiments, Mechanical Engineering, pp.3-8
6 White, Viscous flow, p. 124(Shah and London, Laminar Flow Forced Convection in Ducts, 1978, Academic Press)
7 Kim, S. Y., Kang, B. H. and Kim, J. H., 2001, Forced convection from aluminum foam materials in an asymmetrically heated channel, International J. Heat Mass Transfer 44, pp. 1451-1454   DOI   ScienceOn
8 Kaviany, M., 1995, Principles of Heat Transfer in Porous Media, 2nd ed., Springer, p. 48
9 Kays, W. M. and Crawford, M. E., 1993, Convective Heat and Mass Transfer, McGraw-Hill, Inc., p. 81, 151
10 Hwang, G. J. and Chao, C. H., 1994, Heat transfer measurement and analysis for sintered porous channels, J. of Heat Transfer, Transactions of ASME, Vol. 116, pp. 456-464   DOI   ScienceOn
11 Beavers, G. S. and Sparrow, E. M., 1969, Non-Darcy flow through fibrous porous media, J. Applied Mechanics, Transactions of the ASME, pp.711-714