Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4911536 | Building and Environment | 2017 | 38 Pages |
Abstract
Flow and heat transfer in a vertical open cavity with turbulent mixed convection is investigated experimentally and numerically. The internal size of the cavity is 1 m Ã 1 m Ã 1.2 m, with liquid nitrogen as the cold source and mica electronic heating plates as the heat source of the experiments. The velocity and temperature fields are obtained by hot-wire anemometry, particle image velocimetry and local temperature sensors for 4.6 Ã 104 â¤Â Re â¤Â 5.9 Ã 104 and Gr â¤Â 1.8 Ã 1013. The secondary upward flow was found to occur near the heated walls. Three two-equation RANS turbulence models, RNG k-ε model, L-B Low Re k-ε model and SST k-Ï model, are used in the numerical simulation with the same boundary conditions as experiments. Through comparison with experimental data, Low Re k-ε model performs overall the best in the accuracy in solving mixed convection problems in large-scale vertical cavities with strong buoyancy force.
Related Topics
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Energy
Renewable Energy, Sustainability and the Environment
Authors
Guang Yang, Yiye Huang, Jingyi Wu, Liangjun Zhang, Guozhen Chen, Rongrong Lv, Aifeng Cai,