The effect of surfactant solutions on flow structures in turbulent Rayleigh-Benard convection
| Autor: | Changye Huang, Wen-Tao Su, Weihua Cai, Hong-Na Zhang, Feng-Chen Li, Tong-Zhou Wei |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Convection
Materials science lcsh:Mechanical engineering and machinery 02 engineering and technology 01 natural sciences thermal plumes 010305 fluids & plasmas Physics::Fluid Dynamics 0203 mechanical engineering Pulmonary surfactant 0103 physical sciences Newtonian fluid Shadowgraph surfactant solutions lcsh:TJ1-1570 Physics::Atmospheric and Oceanic Physics Rayleigh–Bénard convection large-scale circulation Rayleigh-Benard convection Renewable Energy Sustainability and the Environment Turbulence Mechanics Nonlinear Sciences::Cellular Automata and Lattice Gases Nusselt number Condensed Matter::Soft Condensed Matter 020303 mechanical engineering & transports Particle image velocimetry |
| Zdroj: | Thermal Science, Vol 22, Iss Suppl. 2, Pp 507-515 (2018) |
| ISSN: | 2334-7163 0354-9836 |
| DOI: | 10.2298/tsci171026263w |
| Popis: | This paper presents an experimental study on the flow structures in turbulent Rayleigh-B?nard convection with surfactant solutions. The shadowgraph visualization was used to obtain the plumes and the velocity field was measured using particle image velocimetry. The results show that the size of plumes in surfactant solution case is larger than that in Newtonian fluid case and it needs more time for surfactant solution case to start convection. The large-scale circulation fails to form in surfactant solution case and the convection velocity is smaller. A decrease of the measured Nusselt number is observed in surfactant solution case. The above phenomena are caused by the shear-shinning and elastic chara cteristics of surfactant solution. |
| Databáze: | OpenAIRE |
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