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CH ENGR 101C Quiz: 7 solutions

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azuremammoth471
9 Jan 2019
School
UCLA
Department
Chemical Engineering
Course
CH ENGR 101C
Professor
Samanvaya Srivastava

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Document Summary

The following three problems are corresponding the figure below. The figure depicts gas absorption into a falling film. The chamber has width w (x-direction) and length l (z- direction). The concentration of a is maintained at ca0 and you can assume that the penetration depth approximation is valid. = 0 : the process is at steady-state, true, false, by making the penetration depth approximation the velocity profile can be written as: 0: what is the total rate of consumption, ma. (select all that apply)

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Related Questions

W25.12 A device has been proposed that will serve as a “blood oxygenator” for a heart-lung bypass machine. In this process, blood (which is mostly water, species B) containing no dissolved oxygen (O2 species A) enters the top of the chamber and then falls vertically down as a liquid film of uniform thickness, along a surface designed to appropriately wet blood. Contacting the liquid surface is a 100% O2 gas phase. Oxygen is soluble in blood, with the equilibrium solubility described by Henry’s law, , where is the partial pressure of oxygen (atm), is the Henry’s law constant, and is the solubility concentration limit of oxygen dissolved in blood (mmol/L) at . In analyzing the mass transport of dissolved oxygen into the falling film, you may assume the following: (1) the process is dilute with respect to dissolved oxygen in the fluid; (2) the falling liquid film has a flat velocity profile with velocity ; (3) the gas space always contains 100% oxygen; (4) the width of the liquid film, W, is much larger than the length of the liquid film, L.

Simplify the general differential equation for O2 transfer. If your analysis suggests more than one dimension for flux, provide a simplified flux equation for each coordinate of interest.

Provide one simplified differential equation in terms of the fluxes and another simplified differential equation in terms of the oxygen concentration .

List boundary conditions associated with the oxygen mass transfer process.

Transport phenomena, chemical engineering

As shown in the figure below, liquid A evaporates in the z-direction and passes through a layer of gas B occupying the region between z=0 and z=L. Suppose that the species A undergoes a chemical reaction (-rA = kCA2) where CA is the concentration of species A. Also, suppose that NB = -NA/2 throughout the system where NA and NB are the molar fluxes of species A and B, respectively. Furthermore, the diffusion coefficient (DAB) of species A varies with its mole fraction (xA) as DAB = D0(1-xA2/4) where D0 is a constant. Find the steady-state concentration (or mole fraction) profile of species A as a function of z. Use the boundary condition of xA=xA0 at z = 0 and xA=xAL at z=L. Assume that diffusion occurs only in the z-direction and the total concentration C of the gas mixture is constant.