DEPARTMENT OF CHEMICAL ENGINEERING CHEG 3043-P01: SEPARATION PROCESSES COURSE AS
ID: 701155 • Letter: D
Question
DEPARTMENT OF CHEMICAL ENGINEERING CHEG 3043-P01: SEPARATION PROCESSES COURSE ASSIGNMENT GRADING AND OUTCOME ASSESSMENT SHEET FOR SPRING 2018 SEMESTER ARETOUTCOME e: Show an ability to apply Name: Title of Assignment: Homework 1 identify, formulate, and solve engineering problems. Due Date: 02/01/2018 Max for this Your Assignment Score Competency Area e.2.iv. Caleulate mass fluxes, molar fluxes, and the overall luxes. 25 TOTAI 25 Problem 1 A common gas is diffusing through a uniform tube 0.15 m in length that contains air at 101.325kPa and 298 K. At one point, the partial pressure of the gas is 89.33 kPa and at another point 22.7 kPa. The diffusivity was found to be 0.1615 x 10 m'/s. Calculate the flux for both the gases. Assume equimolar counterdiffusion. Problem 2 initial flow rate of the feed solution temperature in the vapor space is 40°C and the overall heat transfer coefficient is estimated as 2,000 W/m2 °C. Calculate the amount of steam consumed and surface area needed for heating (40°C) is 50 h. Steam at 3 atm is used to heat the system. TheExplanation / Answer
Ans 1
In case of equimolar counter diffusion
NA = NB = DAB (PA1 - PA2) / RTz
Given data
Tube length z = 0.15 m
Temperature T = 298 K
At one point, the partial pressure of the gas PA1 = 89.33 kPa
At another point, the partial pressure of the gas PA2 = 22.7 kPa
diffusivity DAB =0.1615 x 10^-4 m2 /s
NA = NB = 0.1615 x 10^-4 x (89.33 - 22.7)*1000/(8.314 x 298 x 0.15)
= 0.00289 mol/m2-s
= 2.89 x 10^-5 kmol/m2-s
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