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Experimental study of thermal boundary layer in a dual cavity solar chimney

DOI: 10.1615/THMT-18.450
pages 451-460

Kapil A. Chauhan
School of Civil Engineering, The University of Sydney Darlington, NSW 2006, Australia

Krishna M. Talluru
School of Engineering, University of Newcastle, Callaghan, NSW 2308, Australia; School of Civil Engineering, The University of Sydney Darlington, NSW 2006, Australia

John C. Patterson
Centre for Wind, Waves and Water, School of Civil Engineering, The University of Sydney Darlington, NSW 2006, Australia


Experiments are performed to measure the instantaneous temperature within the natural convection boundary layer developing within a dual-cavity solar chimney. Mean profiles of statistics do not indicate an obvious scaling length that could characterise the thermal boundary layer completely. The root-mean-square profiles of fluctuating temperature suggests that a length-scale could be obtained based on the peak r.m.s. location. However such a length scale results in collapse of profiles only adjacent to the heated surface. Further investigation is necessary at sufficiently high Rayleigh numbers (O(1011)) in order to determine appropriate length-scales in different regions of thermal boundary layer analogous to the inner and outer regions of a high-Reynolds number momentum boundary layer.

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