In the previous question what will be the value of flux (mol/m2.s) with respect to a stationary observer?

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In the previous question what will be the value of flux (mol/m2.s) with respect to a stationary observer?

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A molecule in a mixture moves with a velocity of 0.03m/s in (+x) direction. The concentration of the particle is 0.5 mol/liter. A observer is running in (-x) direction with a velocity of 2m/s. calculate the value of molar flux (mol/m2.s) relative to the observer.

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Calculate the value of mass average velocity in the previous question?

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At which condition molar flux with respect to a stationary observer and with respect to an observer moving with molar average velocity?

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The mass flow rate of a component in a mixture in X-direction is 2kg/s. The area vector at a particular cross-section is (1.1, 3.2, 5.4) cm2. Calculate the value of flux (kg/cm2.s) through the cross-section.

asked Sep 20, 2022 in Mass Transfer by Julian (38.2k points)

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What will be the value of mass average velocity (m/s)?

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Oxygen diffuses through a stagnant layer of air, 1mm thick, ambient temperature 28°C and 1atm total pressure. The partial pressure of oxygen on two sides of layer is P1=0.9atm and P2=0.1atm respectively. Calculate the value of Molar flux (in mol/m^2.s) with respect to an observer moving with molar average velocity. Calculate this value at the end of the path where P2=0.1atm. Use R=8.205*10^-5m^3atmK^-1mol^-1.

asked Sep 21, 2022 in Mass Transfer by Julian (38.2k points)

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In order to prepare Lithium nitride, air is passed gently over a reactor. Suppose that Nitrogen diffuse to a length 5cm before getting reacted with Lithium. Nitrogen reacts with lithium quickly so that partial pressure of Nitrogen at that point is 0. Reactor is a cylinder of length 10cm and diameter 2cm. Assume air to be a mixture of Nitrogen and Oxygen only. The temperature is 298K and total pressure 1atm. Diffusivity of N2 in O2 is 2*10^-5m^2/s. Calculate the Molar flux (mol/m^2.s) of N2 at a distance of 2.5cm from the top with respect to an observer moving with twice the mass average velocity a direction towards the liquid surface. (R=8.205*10^-5m^3atmK^-1mol^-1). Assume z=0 at the top of the reactor.

asked Sep 20, 2022 in Mass Transfer by Julian (38.2k points)

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What is the value of molar average velocity (m/s) of the mixture?

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A solution contains 0.3 moles of solute A, 0.2 moles of B and 0.5 moles of C. What will be the mole fraction of A in the mixture?

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Which among the following can be the unit of Flux?

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In a gas mixture if molecular weights of all the species are equal than which one will be more, Mass average velocity or Molar average velocity?

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What is the value of Volume average velocity?

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In which of the following conditions mass transfer will occur spontaneously? C and z is concentration and distance respectively.

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A reaction 3A+2B+C=1.5D+E occurs in a reactor at steady state. What will be the value of the flux ratio NA/ND

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Consider loss of ethanol vapor by diffusion from a half-filled open test tube. At what point in the diffusion path will the contribution of the bulk flow term to the molar flux be maximum?

asked Sep 21, 2022 in Mass Transfer by Julian (38.2k points)

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In the previous question if the floor has micro pores and water penetrates the floor at a constant rate of 0.1kg/m^2h, what will be the time required for the water layer to disappear?

asked Sep 21, 2022 in Mass Transfer by Julian (38.2k points)

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Which among the following is always true for mass transfer to occur?

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Under which of the following conditions mass average velocity and molar average velocity are equal?

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For the calculation of Mass average velocity, which velocity of the molecule is used?

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A tapered tube of length 8cm and end diameters 2cm and 4cm connects two vessels containing mixtures of A and B. if the tapered tube is replaced with a cylindrical tube of diameter 6cm, what will be the required length of the cylindrical tube to maintain the same flow rate as in the previous case?

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In industries titanium is hardened through diffusion of carbon. The concentration of carbon at 1mm into the surface of the titanium slab is 0.25kg/m^3 and at 3mm the concentration is 0.68kg/m^3. The rate at which the carbon is entering into its surface is 1.27*10-9kg/m^2.s. calculate the value of diffusion coefficient of carbon.

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A sheet of Fe 1.0 mm thick is exposed to an oxidizing gas on one side and a deoxidizing gas on the other at 725°C. After reaching steady state, the Fe membrane is exposed to room temperature, and the C concentrations at each side of the membrane are 0.012 and 0.075 wt%. Calculate the diffusion coefficient (m^2/sec) if the diffusion flux is 1.4×10^-8kg/m^2-sec.

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In the expression for molar flux NA=(NA+NB)CA/C – DABdCA/dz, the terms representing bulk flow and molecular diffusion are, respectively

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What is the value of the flux (kmol/m^3.s) of water vapor through a stagnant film of estimated thickness 1.5mm on the water surface?

asked Sep 21, 2022 in Mass Transfer by Julian (38.2k points)

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What is the value of diffusivity for water?

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In the previous question what will be the value of flux (mol/m2.s) with respect to a stationary observer?

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