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Test: Turbulent Film Condensation


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

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

Which parameter is responsible for commencement of the turbulent flow?

Detailed Solution for Test: Turbulent Film Condensation - Question 1

The character of condensate film can range from laminar to highly turbulent.

Test: Turbulent Film Condensation - Question 2

The transition from laminar to turbulent flow occurs at a critical Reynolds number of

Detailed Solution for Test: Turbulent Film Condensation - Question 2

For turbulent film condensation on vertical surfaces, Kirk bride has suggested the correlation for the average heat transfer coefficient which is valid for Reynolds number greater than 1800.

Test: Turbulent Film Condensation - Question 3

A condenser is to be designed to condense 225.0 kg of steam per hour at a pressure of 0.15 bar. A square array of 400 tubes, each of 6 mm in diameter, is available for the task. If the tube surface temperature is to be maintained at 26 degree Celsius, make calculations for the length of the tube

Detailed Solution for Test: Turbulent Film Condensation - Question 3

sat = 54 degree Celsius and h f g = 2373000 J/kg, t f = 40 degree Celsius and h v = 0.725 [k 3 g p 2 h f g/l δ (t sat – t s)] 0.25 = 5202.34 W/mK. Total S.A of 400 tubes = 7.536l and heat flow rate = m h f g.

Test: Turbulent Film Condensation - Question 4

The outer surface of a vertical tube is 1.25 m long and outer diameter is 50 mm is exposed to saturated steam at atmospheric pressure. If the tube surface is maintained at 80 degree Celsius by the flow of cooling water through it, determine the rate of heat transfer to the coolant

Detailed Solution for Test: Turbulent Film Condensation - Question 4

v = 0.943 [k 3 p 2 g h f g/δ l (t sat – t s)] 0.25 = 5046.8 W/m 2 k and heat flow rate = 19879 W.

Test: Turbulent Film Condensation - Question 5

Consider the above problem, find the rate at which steam is condensed at the tube surface

Detailed Solution for Test: Turbulent Film Condensation - Question 5

Steam condensation rate = 198789/2285 * 10 3 = 8.7 * 10 -3.

Test: Turbulent Film Condensation - Question 6

What is the value of characteristics length in turbulent film condensation?

Where, δ is length of the plate

Detailed Solution for Test: Turbulent Film Condensation - Question 6

d = 4 A/P = 4 b δ/b = 4 δ.

Test: Turbulent Film Condensation - Question 7

What is the value of Reynolds number in terms of mass flow rate?

Where, δ is length of the plate and b id width of the plate

Detailed Solution for Test: Turbulent Film Condensation - Question 7

R = V 4 δ p/δ = 4 m/δ b.

Test: Turbulent Film Condensation - Question 8

Kirk bride criterion is given by

Detailed Solution for Test: Turbulent Film Condensation - Question 8

This is valid for Re greater than 1800.

Test: Turbulent Film Condensation - Question 9

The relation between relative effectiveness of horizontal and vertical tubes as condensing surfaces is given by

Detailed Solution for Test: Turbulent Film Condensation - Question 9

h/h = 0.725/0.943 [(l/d) 0.25].

Test: Turbulent Film Condensation - Question 10

For n-tubes in a vertical column of the tube bank pattern, identify the correct statement

Where, D is the diameter of a single tube in the bank

Detailed Solution for Test: Turbulent Film Condensation - Question 10

It should be n times the diameter of a single tube in the bank.

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