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Discuss Molecular diffusion and Eddy diffusion with examples. List out factors upon which Diffusivity depends?
Derive Fick’s law of diffusion and explain NAand JA. Also Prove that For unidirectional binary diffusion JA=-JB
The effective diffusivities for passage of O2 and N2 at 20°C through a 2-mm thick piece of unglazed porcelain were measured by determining the counter current diffusion fluxes at 1.0 and 0.01 std atm pressure. The diffusivities at 1.0 std atm are DH2-DN2, eff = 5.3*10⁻⁶ m²/s and DK,H2, eff = 1.17*10⁻⁵ m²/s. Estimate (a) Equivalent pore diameter of solid (b) Diffusion fluxes for O2-N2 mixtures at a total pressure of 0.1 std atm, 20° C, with mole fractions of O2=0.8 And 0.2 on either side of the porcelain. [DH2-DN2 at 20°C,1 std atm=7.63*10⁻⁵ m²/s, DO2-DN2 at STP =1.81*10⁻⁵ m²/s]
Derive equations to calculate rate of steady state diffusion of ‘A’ through non- diffusing ‘B’ and also for steady state equimolal counter diffusion in case of gases.
Classify the mass transfer operations based on direct contact of two immiscible phases with examples.
Justify that average mass transfer co-efficient for liquid phase is directly proportional to DAB0.5 for different solutes.
Explain equilateral–triangular co-ordinate, plaint point, tieline, one pair partially soluble system with examples and the mixture rule.
Show that overall resistance in diffusion between two phases follows two resistance theory.
An air – ammonia mixture containing 5% ammonia by volume is absorbed in water in a packed column operated at 293 K and 101.325 kPa so as to recover 98% ammonia. If the inert gas mass velocity to column is 1200 kg/(m²h). Calculate the mass velocity of water to this column if column is operated at 1.25 times the minimum liquid rate to column. Also calculate the composition of liquid leaving column corresponding to this condition. The Equilibrium relationship to this condition is y = 1.154 x. Where x and y are mole fraction of solute.
The equilibrium tie-line data for the system water (A) – chlorobenzene (B) – pyridine (C) at 25°C are given in weight %. Plot the equilibrium data on the following co-ordinate system:
Mention Necessary driving force for crystallizer. Also List out different methods for achieving it.
Calculate the yield of MgSO4.7H2O crystals when 1000 kg saturated solution of MgSO4 at 353 K is cooled to 303 K assuming 10 % of the water is lost by evaporation during cooling. Data: Solubility of MgSO4 at 353 K = 64.2 kg/100 kg water. Solubility of MgSO4 at 303 K = 40.8 kg/100 kg water.
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Official Gujarat Technological University (GTU) examination paper for Mass Transfer Operations I (Winter 2024, B.E. · Chemical Engineering, Sem 5). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.
Transcribed for student exam preparation from Gujarat Technological University official examination archives. Questions, syllabus guidelines, and curriculum marking schemes remain the intellectual property of Gujarat Technological University.
3150501 Mass Transfer Operations I
Official GTU PDF · Winter 2024
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