Terminal Velocity of a Raindrop · BPhO 2020 #7

Physics · fluid-mechanics · newtons-laws

Problem

A spherical raindrop of radius r=1.0  mmr = 1.0\;\text{mm} falls through air. Estimate its terminal velocity using the drag force FD=12CDρairAv2F_D = \frac{1}{2}C_D \rho_{\text{air}} A v^2 with CD=0.5C_D = 0.5, ρair=1.2  kg/m3\rho_{\text{air}} = 1.2\;\text{kg/m}^3, ρw=1000  kg/m3\rho_w = 1000\;\text{kg/m}^3, g=9.8  m/s2g = 9.8\;\text{m/s}^2.

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