Air water slug flows through a 25.4-mm diameter horizontal tube in microgravity condition (less than 1% of earths normal gravity).
Air water slug flows through a 25.4-mm diameter horizontal tube in microgravity condition (less than 1% of earth’s normal gravity). The liquid phase consists of water with dynamic viscosity of μl = 85.5 × 10-5 kg/m · s, density of ρl = 997 kg/m3, thermal conductivity of kl = 0.613 W/m · K, and Prandtl number of Prl = 5.0. The gas phase consists of air with dynamic viscosity of μg = 18.5 × 10-6 kg/m·s, density Pg = 1.16 kg/m3, and Prandtl number Prg = 0.71. At superficial gas velocity of Vsg = 0.3 m/s, superficial liquid velocity Vsl = 0.544 m/s, and void fraction of α = 0.27, estimate the two-phase heat transfer coefficient htp. Assume the dynamic viscosity of water evaluated at the tube surface temperature to be 73.9 × 10-5 kg/m · s.
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