Abstract: The altitude factor for adjusting raindrop velocities from sea level depends primarily on air density and drop size. An adjustment factor is formulated as the air density ratio raised to a power m that varies linearly with ...

Abstract: Potential flow oscillations about an equilibrium raindrop distortion were modeled for ellipsoidal variations driven by changes in surface and gravitational potential energy with linear dissipation of kinetic energy. The ...

Abstract: The equilibrium shape of raindrops has been determined from Laplace's equation using an internal hydrostatic pressure with an external aerodynamic pressure based on measurements for a sphere but adjusted for the effect of ...

Abstract: The size spectra of oscillating raindrops were determined from photographic measurements in Illinois showers at night. The oscillations were detected from modulations in the fall streaks produced by backscattered light ...

Abstract: Velocity adjustments are evaluated for altitude changes using Reynolds number-Davies number correlations of the form Re = aXb which have been obtained from empirical fall velocities of ice particles. In general, the altitude ...

Abstract: The model Beard Chuang, using the differential form of Laplace's formula, has been extended to raindrop shapes under the influence of vertical electric fields and drop charges. A finite volume method was used with a ...

Abstract: The natural oscillations of moderate-size raindrops were studied in a seven-story fall column using a computer-controlled generator to produce isolated water drops at terminal speed. Instantaneous shapes were photographed ...

Abstract: Collisions between small precipitation drops in free fall were analyzed for sizes applicable to self-collection, the process that controls the spreading of precipitation drops to larger sizes. Results from 45 laboratory ...

Abstract: The oscillation frequencies and modes of small raindrops (1.04?1.54-mm diameter) were determined from laboratory experiments using water drops generated at terminal velocity at a fall distance sufficient for initial ...

Abstract: An asymptotic analysis with the method of multiple-parameter perturbations has been carried out to examine the basic features of drop oscillations in a uniform flow field. The quiescent drop shape has an oblate deformation ...