In space-based systems, such as the International Space Station, for example, highly efficient cooling systems are deployed that involve force convection boiling. In a laboratory experiment to develop one such system, a test liquid, which has the physical properties given, flows inside a vertical tube of 1.905 cm (or 0.75 in) inner diameter with a mass flux (or mass velocity) of 680 kg/m² • s. Determine the heat transfer coefficient at a point along the length of the tube at which the quality is 0.3. The wall temperature at this location was measured to be 1808C.

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Pv = 18.1 kg/m³ PL = 567 kg/m³ c/= 2.73 kJ/kg K C₂ = 2.36 kJ/kg K M = 156 x 10-6 kg/m s = 7.11 × 10¯6 kg/m k = 0.086 W/m K 0₁ 8.2 x 10-³ N/m Psat 310.3 kPa I sat = 163.8°C = Psat, corresponding to wall temperature (T, 180°C) = 416.6 kPa =