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)
  • Published : 2007.03.30

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

References

  1. 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
  2. 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 https://doi.org/10.1115/1.2911418
  3. 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 https://doi.org/10.1016/S0017-9310(00)00187-3
  4. Kaviany, M., 1995, Principles of Heat Transfer in Porous Media, 2nd ed., Springer, p. 48
  5. Kline, S.J. and McClintock, F. A., 1953, Describing uncertainties in single sample experiments, Mechanical Engineering, pp.3-8
  6. 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
  7. Kays, W. M. and Crawford, M. E., 1993, Convective Heat and Mass Transfer, McGraw-Hill, Inc., p. 81, 151
  8. 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 https://doi.org/10.1016/0017-9310(64)90006-7
  9. White, Viscous flow, p. 124(Shah and London, Laminar Flow Forced Convection in Ducts, 1978, Academic Press)
  10. Sparrow, E. M. and Loeffler, J. R., 1959, Longitudinal laminar flow between cylinders arranged in regular array, AIChE, Vol. 5, pp. 325-329 https://doi.org/10.1002/aic.690050315
  11. 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