LectureExample_9-1 - Problem 9.3 [3] Given: Boeing 757...

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Problem 9.3 [3] Given: Boeing 757 Find: Point at which transition occurs; Same point at 10,000 m Solution: Basic equation Re x ρ U x μ = Ux ν = and transition occurs at about Re x 51 0 5 × = For air at 20 o C ν 1.50 10 5 × m 2 s = (Table A.10) and we are given U 260 km hr = Hence x p ν Re x U = x p 0.104m = x p 10.4cm = At 10,000 m T 223.3 K = (Table A.3) T 49.8 °C = We need to estimate ν or μ at this temperature. From Appendix A-3 μ bT 1 S T + = b 1.458 10 6 × kg ms K
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