Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1016/j.atmosres.2019.104737 |
A numerical study on the ventilation coefficients of falling lobed hailstones | |
Wang, Pao K.1,2; Chueh, Chih-Che1 | |
2020-04-01 | |
发表期刊 | ATMOSPHERIC RESEARCH
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ISSN | 0169-8095 |
EISSN | 1873-2895 |
出版年 | 2020 |
卷号 | 234 |
文章类型 | Article |
语种 | 英语 |
国家 | Taiwan; USA |
英文摘要 | The ventilation coefficients that characterize the enhancement of heat/mass transfer rate due to the falling motion of lobed hailstones created by a set of mathematical expressions in an atmosphere of pressure 460 hPa and temperature 248 K are computed by numerically solving the convective-diffusion water vapor transport equation while the local airflow velocities are obtained through the numerical solution of unsteady Navier-Stokes Equation around the falling hailstones. The atmospheric condition is chosen so that the hailstone is not growing wet and the ventilation coefficient represents dry hailstone condition. The diameters of the hailstones investigated here are 1, 3, 5, 7 and 10 cm with the Reynolds numbers ranging from 9560 to 388,000 respectively. The ventilation coefficients for all cases are nearly the same when the diameter is 1 cm. The difference becomes greater as the size increases. The highest ventilation coefficient calculated here is > 500 for a 10 cm hailstone with 36 long lobes. We found that in general lobed hailstones have larger ventilation effect than spherical hailstones of the same size. We also report that the connection between basic geometry information (i.e. surface area and volume) and the ventilation coefficients. The larger surface area usually results in greater ventilation coefficient whereas no clear relation exists between the ventilation coefficient and volume for the stones investigated here. Empirical formulas for ventilation coefficient as a function of hailstone diameter and Schmidt numbers are given. Implications of these ventilation coefficients are discussed. |
英文关键词 | Ventilation coefficient Lobed hailstones High Reynolds numbers Turbulent flow Downburst |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000513182600014 |
WOS关键词 | HEXAGONAL ICE CRYSTALS ; HEAT-TRANSFER ; MASS-TRANSFER ; TERMINAL VELOCITY ; DROPS ; HAIL ; EVAPORATION ; KINEMATICS ; GRAUPEL |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/278816 |
专题 | 地球科学 |
作者单位 | 1.Acad Sinica, Res Ctr Environm Changes, Taipei, Taiwan; 2.Univ Wisconsin, Dept Atmospher & Ocean Sci, Madison, WI 53706 USA |
推荐引用方式 GB/T 7714 | Wang, Pao K.,Chueh, Chih-Che. A numerical study on the ventilation coefficients of falling lobed hailstones[J]. ATMOSPHERIC RESEARCH,2020,234. |
APA | Wang, Pao K.,&Chueh, Chih-Che.(2020).A numerical study on the ventilation coefficients of falling lobed hailstones.ATMOSPHERIC RESEARCH,234. |
MLA | Wang, Pao K.,et al."A numerical study on the ventilation coefficients of falling lobed hailstones".ATMOSPHERIC RESEARCH 234(2020). |
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