Problem 2. (Taken from Bergman et.al. 2011*) A small water droplet of diameter D = 100 μm and temperature Tmp = 0°C falls on a nonwetting metal surface that is at temperature Ts = -15°C. Determine how long it will take for the droplet to freeze completely. The thermal conductivity of air is 0.024 W/(m.K) and the latent heat of fusion of water is hsf = 334 kJ / kg. Air Water droplet D. Tmp Nonwetting metal, T

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