Shadowgraph observations of the transition of the thermal boundary layer in a side-heated cavity |
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Authors: | Feng Xu John C Patterson Chengwang Lei |
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Institution: | (1) School of Engineering, James Cook University, Townsville, QLD 4811, Australia |
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Abstract: | The transition of the thermal boundary layer from start-up to a quasi-steady state in a side-heated cavity is observed using a shadowgraph technique. Three stages of the transition, including an initial growth stage, an entrainment development stage and a quasi-steady stage, are demonstrated. A significant feature of the transition revealed from the present flow visualisation is the formation of a double-layer structure along the sidewall at the entrainment development stage. It is believed that the reverse flow in the double-layer structure is the likely cause responsible for the unstable travelling waves at the quasi-steady state. |
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