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IF:
0.562
5-Year IF:
0.605
SJR:
0.175
SNIP:
0.361
CiteScore™:
0.33
ISSN Print: 1065-5131
Volumes:
|
Journal of Enhanced Heat Transfer
DOI: 10.1615/JEnhHeatTransf.v24.i1-6.220
pages 305-320 POROUS COUNTERFLOW HEAT EXCHANGER MODEL: EXPERIMENTAL AND NUMERICAL INVESTIGATION
Jose C. F. Pereira
Mechanical Engineering Department Instituto Superior Tecnico Av. Rovisco Pais, 1049-001 Lisboa Portugal
Mário Costa
IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
Isabel Malico
Department of Physics, University of Évora, R, Romão Ramalho, 59, 7000-671, Évora, Portugal ; IDMEC/IST, Department of Mechanical Engineering, Technical University of Lisbon, Av. Rovisco Pais, 1049-001 Lisbon, Portugal ABSTRACTAn experimental and numerical investigation was performed in order to evaluate the performance of several heat transfer sub-models for conduction, convection and radiation in the prediction of flow and heat transfer through 10 ppi Al2O3 foams with Peclet number based on the pore size o(102). These sub-models comprise either effective conductivity models or two phase (gas and solid) models, corresponding to thermodynamic equilibrium or non-equilibrium assumptions, respectively. Experiments were conducted in a counterflow coaxial heat exchanger, where the hot outer air, flowing at a maximum temperature of 800°C, heats the counter cold inner pipe water flow. Temperature measurements were obtained at several locations inside the porous media, pipe walls and inlet/outlet ports. Two-dimensional finite volume calculations of the coupled phenomena in the full geometrical configuration of the heat exchanger were performed. KEY WORDS: Inverse method, Experiments, Heat transfer, Ceramic foams, Numerical simulations, Thermophysical properties
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