高温壁面における液滴の挙動に関する研究 : 第2報,液滴の粘性と表面張力の影響

抄録

The behavior of the drop impinging upon a hot surface has been investigated experimentally in this paper. Putting importance on the dynamic aspects, the effects provided by the drop's viscosity and the surface tension on the variation of disintegration and deformation of the drops have been examined. The conclusions are summarized as follows; For drops with kinetic viscosity of upto approximately 60 mm²/s, the disintegration patterns can be identified by We number, even if the surface tension and/or the impinging velocity differ. Also, the non-dimensional maximum spreading diameter d_smax/d_i and the non-dimensional maximum apparent contact diameter d_cmax/d_i and the non-dimensional maximum apparent contact diameter d_cmax/d_i can be categorized soley under the We number. But the viscosity increases and becomes more than approximately 80 mm²/s, the effect of viscosity on the variation in disintegration patterns and deformation becomes more marked and then cannot be identified solely by We number. In this study, the experimental equations for d_smax/d_i have been defined by We number and viscosity.