# Air water slug flows through a 25.4-mm diameter horizontal tube in microgravity condition (less than 1% of earths normal gravity).

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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 μ_{l} = 85.5 × 10^{-5} kg/m · s, density of ρ_{l} = 997 kg/m^{3}, thermal conductivity of k_{l} = 0.613 W/m · K, and Prandtl number of Pr_{l} = 5.0. The gas phase consists of air with dynamic viscosity of μg = 18.5 × 10^{-6} kg/m·s, density P_{g} = 1.16 kg/m3, and Prandtl number Pr_{g} = 0.71. At superficial gas velocity of V_{sg} = 0.3 m/s, superficial liquid velocity V_{sl} = 0.544 m/s, and void fraction of α = 0.27, estimate the two-phase heat transfer coefficient h_{tp}. 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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**Related Book For**

## Heat And Mass Transfer Fundamentals And Applications

**ISBN:** 9780073398181

5th Edition

**Authors:** Yunus Cengel, Afshin Ghajar

**Question Details**

**10**- BOILING AND CONDENSATION

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