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Test: Laminar Film Condensation


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10 Questions MCQ Test Heat Transfer | Test: Laminar Film Condensation

Test: Laminar Film Condensation for Chemical Engineering 2022 is part of Heat Transfer preparation. The Test: Laminar Film Condensation questions and answers have been prepared according to the Chemical Engineering exam syllabus.The Test: Laminar Film Condensation MCQs are made for Chemical Engineering 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Laminar Film Condensation below.
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Test: Laminar Film Condensation - Question 1

For laminar film condensation on a vertical plate, the velocity distribution at a distance δ from the top edge is given by

Detailed Solution for Test: Laminar Film Condensation - Question 1

An equation for the velocity distribution as a function of some distance from the wall surface can be set up by considering the equilibrium between the gravity and viscous forces on an elementary volume of the liquid film.

Test: Laminar Film Condensation - Question 2

For laminar film condensation on a vertical plate, the film thickness is given by

Detailed Solution for Test: Laminar Film Condensation - Question 2

The film thickness increases as the fourth root of the distance down the surface.

Test: Laminar Film Condensation - Question 3

For laminar film condensation on a vertical plate, the mass flow rate of the condensate per unit depth of the film at any position x is given by

Detailed Solution for Test: Laminar Film Condensation - Question 3

Mass flow rate = mean flow velocity * flow area * density.

Test: Laminar Film Condensation - Question 4

For laminar film condensation on a vertical plate, the gravitational acceleration g is replaced by

Where, α is the inclination angle with the horizontal

Detailed Solution for Test: Laminar Film Condensation - Question 4

It is replaced by sin α.

Test: Laminar Film Condensation - Question 5

For laminar film condensation on a vertical plate, the local heat transfer coefficient at the lower edge of the plate is given by

Detailed Solution for Test: Laminar Film Condensation - Question 5

The rate of condensation heat transfer is higher at the upper end of the plate than at the lower end.

Test: Laminar Film Condensation - Question 6

Mark the wrong statement with respect to laminar flow condensation on a vertical plate

Detailed Solution for Test: Laminar Film Condensation - Question 6

The average heat transfer coefficient is 4/3 of the local heat transfer coefficient at the lower edge of the plate.

Test: Laminar Film Condensation - Question 7

A plate condenser of dimensions l * b has been designed to be kept with side l in the vertical position. However due to oversight during erection and installation, it was fixed with side b vertical. How would this affect the heat transfer? Assume laminar conditions and same thermos-physical properties and take b = l/2

Detailed Solution for Test: Laminar Film Condensation - Question 7

1 = 0.943 [k 3 p 2 g h f g/δ l (t sat – t s)] 0.25, h2 = 0.943 [k 3 p 2 g h f g/δ b (t sat – t s)] 0.25. So, h 1/h = 0.8409.

Test: Laminar Film Condensation - Question 8

Determine the length of a 25 cm outer diameter tube if the condensate formed on the surface of the tube is to be same whether it is kept vertical or horizontal

Detailed Solution for Test: Laminar Film Condensation - Question 8

v = 0.943 [k 3 p 2 g h f g/δ l (t sat – t s)] 0.25, h H = 0.943 [k 3 p 2 g h f g/δ d (t sat– t s)] 0.25, l/d = 2.86.

Test: Laminar Film Condensation - Question 9

The critical Reynolds number for transition from laminar to turbulent film condensation is

Detailed Solution for Test: Laminar Film Condensation - Question 9

This should be 1800 for perfect transition from laminar to turbulent film condensation.

Test: Laminar Film Condensation - Question 10

Which of the following is a wrong statement in the context of convective heat transfer coefficient in laminar film condensation?The heat transfer coefficient varies as

Detailed Solution for Test: Laminar Film Condensation - Question 10

h = 0.943 [k 3 p 2 g h f g/δ l (t sat – t s)] 0.25. Further the heat transfer coefficient varies as ¼ power of acceleration due to gravity.

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