An air-water mixture is flowing in a 5° inclined tube that has a diameter of 25.4 mm. The two-phase mixture enters the tube at 25°C and exits at 65°C, while the tube surface temperature is maintained at 80°C. If the superficial gas and liquid velocities are 1 m/s and 2 m/s, respectively, determine the two- phase heat transfer coefficient htp. Assume the surface tension is σ = 0.068 N/m and the void fraction is α = 0.33.
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