Motion of 2D Buoyant Clouds Downslope |
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Authors: | Juichiro Akiyama Masaru Ura |
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Affiliation: | 11Assoc. Prof., Dept. of Civ. Engrg., Facu. of Engrg., Kyushu Inst. of Technol., Kitakyushu 804, Japan.
22Prof., Dept. of Civ. Engrg., Facu. of Engrg., Kyushu Inst. of Technol., Kitakyushu 804, Japan.
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Abstract: | The motion of conservative 2D thermals on beds with slope angles θ ranging from 5 to 90° is investigated theoretically and experimentally. Using a large number of experimental data, important flow characteristics, including the shape factors, spatial growth rate, propagation speed, and entrainment coefficient, are quantified as functions of bottom slope angles. A thermal model, which includes a resistance term, is developed. It is found semiempirically that resistance coefficients Cd are almost independent of θ and the values of Cd are in the range of 0.4–0.6. Capability of the model is demonstrated by comparing numerical results with theoretical as well as experimental results. |
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