The contact angle has been applied in many aspects, such as in Mining flotation, Oil exploitation, Textile printing and dyeing, Pesticide processing, Paint formula and so on. And, as one of the most important parameters in microgravity, the study to the contact angle is very necessary. C. W. Extrand has explored the influence of curved surfaces on contact angles using the experimental and theoretical methods, but he only studied the outside of the spherical surface. In this paper, we put forward an assume that the contact angle is just as a boundary condition, and has nothing to do with the shape of the surface and the volume of the liquid in microgravity. And we studied the influence of the inner spherical surface and the inner cylindrical surface to the contact angle, and finally compared with the contact angle in the flat surface.
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机译：接触角已广泛应用于采矿浮选，石油开采，纺织品印染，农药加工，涂料配方等领域。并且，作为微重力中最重要的参数之一，对接触角的研究是非常必要的。 C. W. Extrand使用实验和理论方法探索了曲面对接触角的影响，但他仅研究了球形表面的外部。在本文中，我们提出了一个假设，即接触角只是一个边界条件，与表面形状和微重力下的液体体积无关。并研究了内球面和内圆柱面对接触角的影响，最后与平面内的接触角进行了比较。
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