Engineering, 15.10.2019 18:00 Suphat
22.5-4. minimum liquid flow in a packed tower. the gas stream from a chemical reactor contains 25 mol % ammonia and the rest are inert gases. the total flow is 181.4 kg mol/h to an absorption tower at 303 k and 1.013 × 105 pa pressure, where water containing 0.005 mol frac ammonia is the scrubbing liquid. the outlet gas concentration is to be 2.0 mol % ammonia. what is the minimum flow l min ′ using 1.5 times the minimum, plot the equilibrium and operating lines. ans. l min ′ = 262.6kg mol/h
Answers: 3
Engineering, 04.07.2019 18:10
During a steady flow process, the change of energy with respect to time is zero. a)- true b)- false
Answers: 2
Engineering, 04.07.2019 18:10
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 18:20
A3-mm-thick panel of aluminum alloy (k 177 w/m-k, c 875 j/kg-k and ? = 2770 kg/m) is finished on both sides with an epoxy coating that must be cured at or above t,-150°c for at least 5 min. the production line for the curing operation involves two steps: (1) heating in a large oven with air at ts,0-175°c and a convection coefficient of h, 40 w/m2. k, and (2) cooling in a large chamber with air at 25°c and a con- vection coefficient of he 10 w/m2.k. the heating portion of the process is conducted over a time interval te which exceeds the ime required to reach 150°c by 5 min (h = r + 300 s). the coating has an emissivity of ? = 0.8, and the temperatures of the oven and chamber walls are 175 and 25°c, respectively. if the panel is placed in the oven at an initial temperature of 25°c and removed from the chamber at a safe-to-touch tempera ture of 37°c, what is the total elapsed time for the two-step curing operation?
Answers: 3
Engineering, 04.07.2019 18:20
Amixture of slurry and mud is to be pumped through a horizontal pipe of diameter 500 mm. the fluid behaves as a bingham plastic with a yield stress of 30 pa and viscosity 0.04 pa.s. describe the effects of the shear stress through a transverse section of the pipe by plotting the variation in shear stress and velocity profile: (i) just before the slurry starts to move (ii) as the slurry flows when the pressure gradient is double that in part (i)
Answers: 3
22.5-4. minimum liquid flow in a packed tower. the gas stream from a chemical reactor contains 25 mo...
English, 04.02.2021 21:40
English, 04.02.2021 21:40
Mathematics, 04.02.2021 21:40
Mathematics, 04.02.2021 21:40
Engineering, 04.02.2021 21:40
Mathematics, 04.02.2021 21:40
English, 04.02.2021 21:40
Mathematics, 04.02.2021 21:40
Mathematics, 04.02.2021 21:40
Mathematics, 04.02.2021 21:40