2/29/2024 0 Comments Falling raindrop shapeThe latter is the most hydrodynamically efficient, forced by the falling drop's slipstream, with a spherical-cap nose tapering back to a. The terminal velocity depends on the size, shape and mass of the raindrop and the density of the air. More recently, the 2D video disdrometer (2DVD) incorporates both the. What falling raindrops shape Spherical to tear-drop shape. As an object falls, it experiences a frictional drag that counters the downward force of gravity.When the gravity and frictional drag are balanced, we have an equilibrium fall speed that is known as the terminal velocity of the object. As raindrops grow in mass, they evolve from spheres to oblate spheroids to shapes resembling the top of a hamburger bun (e.g. To measure the velocities, shapes and size distributions of raindrops, meteorologists typically use a device named a ‘disdrometer,’ (or drop size meter) which measures the properties of the droplets as they fall onto a sensing surface. Our results have implications for precipitation efficiency, convective storm dynamics, and rainfall rates, which are properties of interest for understanding planetary radiative balance and (in the case of terrestrial planets) rainfall-driven surface erosion. Raindrop Shape Falling raindrops adopt a range of shapes depending on their sizethough never the teardrop shape in-scribed in the public imagination (Blanchard, 2004). Starting from the equations governing raindrop falling and evaporation, we demonstrate that raindrop ability to vertically transport latent heat and condensible mass can be well captured by a new dimensionless number. When asked to picture the shape of raindrops, many of us will imagine water looking like tears that fall from our eyes, or the stretched out drip from a leaky faucet. We demonstrate that these simple, interrelated characteristics tightly bound the possible size range of raindrops in a given atmosphere, independently of poorly understood growth mechanisms. The equilibrium shape of raindrops is most simply described by the axis ratio, a ratio of the maximum vertical and horizontal chords. ![]() ![]() Here, we show how three properties that characterize falling raindrops - raindrop shape, terminal velocity, and evaporation rate - can be calculated as a function of raindrop size in any planetary atmosphere. Download a PDF of the paper titled The Physics of Falling Raindrops in Diverse Planetary Atmospheres, by Kaitlyn Loftus and 1 other authors Download PDF Abstract:The evolution of a single raindrop falling below a cloud is governed by fluid dynamics and thermodynamics fundamentally transferable to planetary atmospheres beyond modern Earth's.
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