Engineering, 14.10.2019 19:20 120175
Consider a pressure vessel that is a thin-walled tube with closed ends and wall thickness t. the volume enclosed by the vessel is determined from the inner diameter d and length l by ve = πd2l/4. the ratio of a small change in the enclosed volume to the original volume (known as the volumetric strain) can be found by obtaining the differential dveand then dividing by ve. (a) obtain this expression, i. e., dve/ve.(b) derive an equation for dve/ve as a function of the pressure p in the vessel, the vessel dimensions, and elastic constants of the isotropic material. assume that l is large compared to d, so that the details of the behavior of the ends are not important.
Answers: 1
Engineering, 04.07.2019 18:10, lillygrl100
For the closed feedwater heater below, feedwater enters state 3 at a pressure of 2000 psia and temperature of 420 °f at a rate of ix10 ibhr. the feedwat extracted steam enters state 1 at a pressure of 1000 psia and enthalpy of 1500 btu/lbm. the extracted er leaves at an enthalpy of 528.7 btu/lbm steam leaves as a saturated liquid. (16) a) determine the mass flow rate of the extraction steam used to heat the feedwater (10) b) determine the terminal temperature difference of the closed feedwater heater
Answers: 3
Engineering, 04.07.2019 18:10, lowkeyqueenk
Apipe with an outside diameter of 15 cm is exposed to an ambient air and surrounding temperature of -20°c. the pipe has an outer surface temperature of 65°c and an emissivity of 0.85. if the rate of heat loss from the pipe surface is 0.95 kw per meter of length, the external convective heat transfer coefficient (h) is: (a) 12.5 w/m"k (b) 18.6 w/mk (c) 23.7 w/mk (d) 27.9 w/mk (e) 33.5 w/mk
Answers: 1
Consider a pressure vessel that is a thin-walled tube with closed ends and wall thickness t. the vol...
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