19_ch 12 Mechanical Design budynas_SM_ch12

19_ch 12 Mechanical Design budynas_SM_ch12 -...

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322 Solutions Manual • Instructor’s Solution Manual to Accompany Mechanical Engineering Design 12-20 From Table 12-1, Seireg and Dandage, µ 0 = 0 . 0141(10 6 )reyn and b = 1360 . 0 µ ( µ reyn) = 0 . 0141 exp[1360 / ( T + 95)] ( T in °F) = 0 . 0141 exp[1360 / (1 . 8 C + 127)] ( C in °C) µ (mPa · s) = 6 . 89(0 . 0141) exp[1360 / . 8 C + 127)] ( C in °C) For SAE 30 at 79°C µ = 6 . 89(0 . 0141) exp { 1360 / [1 . 8(79) + 127] } = 15 . 2mPa · s Ans. 12-21 Originally d = 2 . 000 + 0 . 000 0 . 001 in, b = 2 . 005 + 0 . 003 0 . 000 in Doubled, d = 4 . 000 + 0 . 000 0 . 002 in, b = 4 . 010 + 0 . 006 0 . 000 The radial load quadrupled to 3600 lbf when the analyses for parts (a) and (b) were carried out. Some of the results are: Trumpler Part ¯ c µ ± S ¯ T f fr / cQ s h o / c ± H loss h o h o f (a) 0.007 3.416 0.0310 135.1 0.1612 6.56 0.1032 0.897 9898 0.000 722 0.000 360 0.005 67 (b) 0.0035 3.416 0.0310 135.1 0.1612 0.870 0.1032 0.897 1237 0.000 361 0.000 280 0.005 67 The side flow Q s differs because there is a c 3 term and consequently an 8-fold increase. H loss is related by a 9898
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