2_ch 12 Mechanical Design budynas_SM_ch12

2_ch 12 Mechanical Design budynas_SM_ch12 -...

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Chapter 12 305 The interpolation formula of Eq. (12-16) will have to be used. From Figs. 12-16, 12-21, and 12-19 For l / d =∞ , h o / c = 0 . 96, P / p max = 0 . 84, Q rcNl = 3 . 09 l / d = 1, h o / c = 0 . 77, P / p max = 0 . 52, Q = 3 . 6 l / d = 1 2 , h o / c = 0 . 54, P / p max = 0 . 42, Q = 4 . 4 l / d = 1 4 , h o / c = 0 . 31, P / p max = 0 . 28, Q = 5 . 25 Equation (12-16) is easily programmed by code or by using a spreadsheet. The results are: l / dy y 1 y 1 / 2 y 1 / 4 y l / d h o / c 2 0.96 0.77 0.54 0.31 0.88 P / p max 2 0.84 0.52 0.42 0.28 0.64 Q / 2 3.09 3.60 4.40 5.25 3.28 h o = 0 . 88(0 . 001) = 0 . 000 88 in Ans . p max = 128 0 . 64 = 200 psi Ans . Q = 3 . 28(0 . 625)(0 . 001)(19 . 167)(2 . 5) = 0 . 098 in 3 /s Ans . 12-3 c min = b min d max 2 = 3 . 005 3 . 000 2 = 0 . 0025 in r . = 3 . 000 / 2 = 1 . 500 in l / d = 1 . 5 / 3 = 0 . 5 r / c = 1 . 5 / 0 . 0025
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