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Air at 20°C (1 atm) is flowing over a 0.025-m diameter sphere with a velocity of...

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Mechanical Engineering



Air at 20°C (1 atm) is flowing over a 0.025-m diameter sphere witha velocity of 3.5 m/s. If the surface temperature of the sphere isconstant at 80°C, determine the Reynolds number corresponding tothe sphere, its average drag co-efficient, and the heat transferrate from the sphere. The properties of air (1 atm) at the freestream temperature T∞ = 20°C, ρ = 1.204kg/m3, k = 0.02514W/m∙K, μ = 1.825 × 10−5 kg/m∙s,and Pr = 0.7309. At the surfacetemperature Ts=80°C: μs = 2.096 ×10−5 kg/m∙s. At the filmtemperature Tf = (80°C + 20°C)/2= 50°C: ρ = 1.092kg/m3 and v = 1.798 ×10−5 m2/s. (Round the Reynolds number tothe nearest whole number and other answers to two decimalplaces.)

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