Q2)In an experiment CO₂ absorbed into a water film (thickness = 2.396x10 m) flowing= 2.396down a vertical wall I m long at 25 °C and 1 atm. The solubility of CO₂ in water is 0.0336kmol/m' solution. At the middle of the tower height, the penetration of CO₂ was measuredand it was found that the concentration at a depth of 30% of the film thickness theconcentration was 0.02933 kmol/m' solution. The density and viscosity of the solution ar998 kg/m³ and 8.94x10 kg/m.s. calculate the mass flux.Answer to 02:

The rate of mass flow is the mass flux. The flow of mass per unit time is the mass current. The area…

Answered: Q2) In an experiment CO₂ absorbed into…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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Fundamentals of Momentum, Heat and MassTransfer by james welty
A long glass capillary with a diameter of 0.1 cm is in contact with water on one side and dry air on the other. Water vapor evaporates from the side in contact with water and diffuses through the capillary to the other side. Using the following given data, calculate the rate at which water evaporates in this system in [g/s].Isothermal diffusion (20℃)Vapor pressure of water 17.5 mmHg (20℃)Water diffusivity 0.3 cm2/s (20℃)Dry air pressure 760 mmHgDural length 10 cmGas constant R=82 cm3atm/mol K18 g/mol molecular weight of water
A sheet of steel with 100cm2 area has nitrogen(N2) atmospheres on both sides and is permitted to achieve a steady-state diffusion condition. In order to increase the flow rate of N2, which of the following modifications is useful? Steel sheet O Increase the N2 pressure at C1 O Decrease the temperature. O Increase the N2 pressure at C2 O Increase the thickness of the steel sheet.
For the absorption of solute A through a falling film, its Peclet number, Npe is in proportion to Select one or more: A. The average velocity of the falling film. B. All of the given choices. C. Diffusivity (DAB) D. Thickness of the falling film E. The reciprocal of diffusivity (1/DaB) O OOSOD OOSOL
1) A biofilm is a layer-like aggregation of microscopic animals, plant or bacteria attached to a solid surface. Assume such a biofilm where the reactant is consumed Bulk fluid only at the solid surface, maintaining a particular value of surface concentration. Calculate the steady-state reactant flux into a biofilm of thickness 0.01 cm, if the diffusivity of the reactant in the biofilm is 0.8 cm²/day. Assume the reactant concentration in the bulk fluid to be uniform at 3.2 mg/liter. At the surface, reactant concentration is 0.25 mg/liter. Biofilm Surface
Consider a diffusion process in a semi-infinite solid with a source at x=0 mm, the concentration of the diffusing species is 2 nm-3 at x=5 mm and t=1 hr (since the start of the process). At what time the concentration at x=15 mm will reach 3 nm-3 ?
A new type of porous material serves as food packaging film, as shown in the figure below. The film rests on a nonporous metal plate. The packaging film is 0.20 cm thick (2.0 mm). The food contains liquid water, which exerts a vapor pressure of 0.030 atm at 25Â°C. At 25Â°C, the effective diffusion coefficient of water vapor in the porous film is 1.3 x 10^-4 cm/s, and the molecular diffusion coefficient of water vapor in air is 0.26 cm/s. You may assume that the total system pressure is constant at 1.0 atm, and initially, the gas space of the porous film contains air and no water vapor. How long will it take for the water vapor to achieve a partial pressure of 0.0150 atm at the back surface of the film (z = 0) at 25Â°C?
Consider a metal spherical vessel, with an inner diameter of 5 m and a thickness of 3 mm, containing hydrogen gas at 2000 kPa. The vessel is situated in a room with atmospheric air at 1 atm. The ventilation system for the room can keep the air fresh, provided that the rate of hydrogen leakage is below 5 μg/s. If the diffusion coefficient and solubility of hydrogen gas in the metal vessel are 1.5 × 10−12 m2/s and 0.005 kmol/m3·bar, respectively, determine whether the vessel is safely containing the hydrogen gas
Problem #1: Diffusion-convection problems wherein the species diffusivity is concentration-dependent often provide a differential equation of the following general form: where Cis the dimensionless concentration and z is the dimensionless distance. Assume vL/D, is a constant. Assume that C= 1 at z = 0, and C=0 when z is very large. Solve the above differential equation and provide an exact analytical equation for C=ft:). Problem #2: In a diffusion-reaction system, reactant 'A' diffuses through a porous catalyst pellet and reacts in a 1* order reaction to produce 'B'. Efficacy of the catalyst in converting 'A' to 'B' is a function of 'x' such that the mass balance equation describing the system at steady-state is: d?c Dari -kīC = 0 Cis the concentration of 'A' that varies in the x-direction, k is the 1t order reaction rate constant, and D is the diffusion coefficient of 'A'. L is the thickness of the catalyst layer, and can be treated as a constant. First, non-dimensionalize the…
A quiescent body of water has a depth of 600 mm. The DO level at the bottom after 16 days is 3.5 mg/l when the surface is exposed to the atmosphere at a temperature of 25o Determine the DO of the water body. The saturated DO at 25oC is 8.5 mg/l and the diffusion coefficient (kd) at 25oC is 2.5 x 10-3 mm2/s.

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