Write briefly about different mass transfer coefficients

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Reference no: EM132317686

Advanced Mass Transfer -

Q1) Write very briefly about the following:

a) Fick's second law and its application.

b) Different Mass transfer coefficients.

c) Raoult's law and Henry's law and their applications.

d) Give the j_D correlation for mass transfer in flow parallel to flat plate.

e) Chilton - Colburn analogy.

f) Capacity coefficients and their use.

g) Marangony effect.

Q2) Explain and derive the Mass transfer flux equation for molecular diffusion in gases for the case of (i) Equimolar counter diffusion and (ii) A is diffusing through stagnant non diffusing B.

Q3) a) Explain the diffusion through a varying cross sectional area and derive the equation for mass transfer flux.

b) A sphere of naphthalene having a radius of 2.00 mm is suspended in a large volume of still air at 318 K and 1.01325 x 10⁵ Pa. The surface temperature of the naphthalene can be assumed to be at 318 K and its vapor pressure at that temperature is 0.555 mm Hg. The DAB of naphthalene in air at 318 K is 6.92 x 10^-6 m²/s. Calculate the rate of evaporation of naphthalene from the surface.

Q4) a) Explain briefly about the diffusivities in gases

b) Explain briefly about the diffusivities in liquids

Q5) a) Explain the diffusivities of electrolytes in liquids

b) Predict the diffusion coefficients of dilute electrolytes for the following cases:

i) For KCl at 25^oC, calculate D^o_AB.

ii) For KCl at 18.5^oC, calculate D^o_AB.

iii) For CaCl₂ at 25^oC, calculate D^o_AB. Also predict Di of ion Ca⁺² and of Cl^-.

Data: λ₊(K⁺) = 73.5, λ_-(Cl^-) = 76.3, λ₊(Ca²⁺/2) = 59.5

Q6) Explain (a) The two film theory and (b) The penetration theory.

Q7) Explain the mass transfer in the laminar boundary layer when the fluid is in laminar flow over a flat plate.

Q8) Explain the following briefly.

a) Individual and overall mass transfer coefficients.

b) Reynolds analogy.

Note - Need elaboratively as per the questionnaire and also, need the reference book from which they have taken these. Need the answers not from the web from the reference books with good clarification.

Reference no: EM132317686

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Reviews

len2317686

6/6/2019 10:13:15 PM

The marks allotment was not given for each question there are some choice questions are there, let them answer all. Question No. 1 is compulsory. Answer any Five questions from the rest. All questions carry equal marks. Please do answer all the questions for my future reference. Please do give me the books from which the answers are taken (reference books). This is very important.

len2317686

6/6/2019 10:03:10 PM

I need elaboratively as per the questionnaire and also, I need the reference book from which they have taken these. I need the answers not from the web from the reference books with good clarification but with reference books names please where applicable.

len2317686

6/6/2019 10:03:05 PM

Guideline – Ensure to solve every question in series. Do not copy past answers, as it will lead to rejection of answer sheets. Make sure to write enough length answers of descriptive questions as per the weightage. Highlight more relevant case studies and practice examples. Submit answer sheet in standard format only. Make sure to be in time limits of submission to avoid rejection of submission after deadline. In case of hand written sheet submission please be assure of sober writing and cleanliness of answer sheet. Do take care of numerical and diagrammatical representation up to the mark if applicable.

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