p0112 - ~ > ± ± : 1 . 66 X 2077 J kg · K ~ (288 . 16...

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1.12. CHAPTER 1, PROBLEM 12 13 1.12 Chapter 1, Problem 12 Using conditions quoted in the text, for a temperature of 15 o C the kinematic viscosity of helium is ν =1 . 14 · 10 4 m 2 /sec, and the absolute temperature is T =288 . 16 K. Finally, the perfect-gas constant is R = 2077 J/kg · K and the specific-heat ratio is γ = 1.66. Thus, the mean free path, f mfp ,is f mfp = 1 . 5 ν γ RT = 1 . 5 X 1 . 14 · 10 4 m 2 sec
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Unformatted text preview: ~ > ± ± : 1 . 66 X 2077 J kg · K ~ (288 . 16 K) = 1 . 72 · 10 − 7 m Imperial Standard 45 Gauge wire has a diameter of d = 0.0071 cm. Thus, d f mfp = 7 . 1 · 10 − 5 m 1 . 72 · 10 − 7 m = 413 Since d ( f mfp , flow of helium past this type of wire at the stated conditions falls within the continuum limit....
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This note was uploaded on 02/09/2012 for the course AME 309 taught by Professor Phares during the Spring '06 term at USC.

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