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Thermophysics and Aeromechanics

2006 year, number 3

Experimental study and mathematical modelling of heat transfer processes in heat accumulating media

I.V. Mezentsev1, N.V. Vernikovskaya2, Yu.I. Aristov2, and V.A. Mukhin3
1Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
2Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russia
3Siberian State University of Transport, Novosibirsk, Russia
Pages: 403-410


Experimental results on reversing non-stationary heat transfer are presented for filtration of an air flow through an immobile heat accumulating medium consisting of lead (D = 2.0, 3.5, and 4.5 mm) and glass (D = 3.2 mm) balls. The studied device imitated the cyclic modes of heat regeneration in the ventilation system for domestic and office rooms. Dependency between the time of flow switching and Re number was measured. The mathematical model describing heat transfer between a gas flow and an immobile layer of balls was developed. Good correspondence between the experimental data and calculation results is observed for high Reynolds numbers. For low Re numbers the effect of heat losses is considerable, and experimental time of flow switching is shorter than the calculation one.