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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Water drop impact on a semi-cylindrical convex hot surface for a diameter ratio of unity
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Water drop impact on a semi-cylindrical convex hot surface for a diameter ratio of unity

机译：水滴对半圆柱凸热表面的影响，统一的直径比

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摘要

When a liquid drop impacts on a hot non-flat surface the curvature of the surface and its geometrical characteristics transmute the physical regimes and their boundary compared to a flat surface impact. The present experimental study is focused on water drop impingement on a mimetic solid semi-cylindrical convex hot surface, with a size equal to the drop. The thermal versus inertia map of generated regimes is obtained, while some well-known regimes associated with a flat surface are not observed for the present non-flat impacts. These include rebounding of the main drop and atomization which are common observed phenomena when the hot surface is flat. The maximum spreading of the droplet is measured at different surface temperatures and impact Weber numbers. In directrix direction it is independent of temperature at both partial contacted and breakup regions but reduces upon transitioning at high Weber numbers. The maximum spreading scaling with the impact Weber number is obtained along both directrix and generatrix directions. Finally, since the spreading is asymmetric, its aspect ratio is obtained and has shown a considerable rise at partial contacted high Weber numbers.
机译：当对热非平坦表面上的液滴冲击时，与平坦表面的影响相比，表面的曲率及其几何特征传递了物理制度及其边界。本实验研究专注于对模拟固体半圆柱凸热表面上的水滴冲击，尺寸等于下降。获得产生的制度的热量与惯性图，而没有观察到与平坦表面相关的一些众所周知的制度对于本发明的非平面冲击。这些包括当热表面平坦时常见的观察现象的主滴和雾化的反弹。液滴的最大扩散在不同的表面温度下测量并影响韦伯数。在Directrix方向上，它与部分接触和分离区域的温度无关，但在高韦伯数下转换时减少。沿着Directrix和Persitrix方向获得了带有冲击韦伯号的最大扩展缩放。最后，由于扩展不对称，因此获得其纵横比并且已经示出了部分接触高韦伯号的相当大的升高。

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