LAST 3 PARTS. D, E, and F ONLY PLEASE. Problem 30-1E. The photocatalytic tubular reactor shown in Figure 30-1E is used to decompose organiccontaminants in liquid waste water. The inter walls of the 1.5 cm inner diameter glass tube are lined witha thin, nonporous, transparent layer of nano-crystalline titanium dioxide (TiO₂), which catalyzes theoxidation of dissolved organic chemicals to carbon dioxide and water, using sunlight to drive thisphotocatalytic process. In the present process, waste water containing 10 g/m³ of benzene (solute A)dissolved in water enters the tube at 313 K, and it is necessary to have a Reynolds number (Re) of 5000for flow through the tube. The steady state process temperature is 313 K. For purposes of analysis,assume the consumption of species A at the catalyst surface is so rapid that the effective concentration ofspecies A at the catalyst surface is equal to zero (CALS~ 0). Potentially useful data at 313 K: moleculardiffusion coefficient of benzene (CH6, species A) in liquid water, DAB = 1.45 x 105 cm²/sec, M₁ = 78g/gmole, μB = 0.00658 g/cm-sec (0.658 CP), PB = 0.993 g/cm³.sunlightwastewaterCALO 10 g A/m³Re = 5000313KD = 1.5 cmtransparent TiO₂ catalyst layerlining inside of glass tubez = L = 25mCALNACAL,S 0catalyst surfaceFigure 30-1E. Photocatalytic tubular reactor.(a) Identify the SOURCE and SINK for mass transfer of benzene.(b) Is the photocatalytic reaction is best represented as (1) A homogeneous reaction within the controlvolume for mass transfer or (2) A heterogeneous reaction at a boundary surface? Justify yourresponse.(c) Estimate the convective mass transfer coefficient of benzene in water flowing through the tube, k₁.(d) (Develop a model, in final integrated form, to estimate the concentration of species A exiting the tube.State three primary assumptions of your model. The model must at least contain the followingvariables: CAL, CAL, KL, L, V, D.(e) If the tube length (L) is 25.0 m, what is the concentration of benzene in the waste water exiting thetube, i.e. Ca at z = L?(f) Consider now that the surface reaction is slow enough so that the benzene concentration on thecatalyst is CALS> 0, and the surface reaction is described by a first-order process with k, = 0.0010cm/sec. Estimate the new outlet concentration of benzene.

The wastewater that enters the tube and contains 10 g/m3 of benzene (solute A) dissolved in water is…

(d) (Develop a model, in final integrated form, to estimate the concentration of species A exiting the tube. State three primary assumptions of your model. The model must at least contain the following variables: CAL, CAL, KL, L, V, D. (e) If the tube length (L) is 25.0 m, what is the concentration of benzene in the waste water exiting the tube, i.e. CAL at z=L? (f) Consider now that the surface reaction is slow enough so that the benzene concentration on the catalyst is CAL > 0, and the surface reaction is described by a first-order process with k, = 0.0010 cm/sec. Estimate the new outlet concentration of benzene.

(d) (Develop a model, in final integrated form, to estimate the concentration of species A exiting the tube. State three primary assumptions of your model. The model must at least contain the following variables: CAL, CAL, KL, L, V, D. (e) If the tube length (L) is 25.0 m, what is the concentration of benzene in the waste water exiting the tube, i.e. CAL at z=L? (f) Consider now that the surface reaction is slow enough so that the benzene concentration on the catalyst is CAL > 0, and the surface reaction is described by a first-order process with k, = 0.0010 cm/sec. Estimate the new outlet concentration of benzene.

Understanding Motor Controls

4th Edition

ISBN:9781337798686

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter44: Semiconductors

Section: Chapter Questions

Problem 3RQ: The two materials most often used to produce semiconductor devices are ____________ and...

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