Choose the right answer 1. The mean Nusselt number for fully developed laminar flow in a circular tube under a constant heat flux a. depends on Reynolds number b. depends on Prandtl number c. is constant 2. The value of Prandtl number for air is about а. О.1 b. 0.3 с. 0.7 3. In natural convection heat transfer, the Nusselt number is a function of a. Re and Pr b. Re and Gr c. Grand Pr 4. A fluid is flowing along a plate having a high uniform wall temperature. The heat transfer along the length a. decreases b. remain constant c. increases

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
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Author:Kreith, Frank; Manglik, Raj M.
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Chapter9: Heat Transfer With Phase Change
Section: Chapter Questions
Problem 9.20P
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Choose the right answer
1. The mean Nusselt number for fully developed laminar flow in a circular tube under a
constant heat flux
a. depends on Reynolds number
b. depends on Prandtl number
c. is constant
2. The value of Prandtl number for air is about
а. О.1
b. 0.3
с. 0.7
3. In natural convection heat transfer, the Nusselt number is a function of
a. Re and Pr
b. Re and Gr
c. Grand Pr
4. A fluid is flowing along a plate having a high uniform wall temperature. The heat
transfer along the length
a. decreases
b. remain constant
c. increases
5. For fully developed laminar flow and heat transfer in a heated long circular tube, if the
flow velocity is doubled and the tube diameter is halved, the heat transfer coefficient will
be
a. four times of the original value
before
b. half of the original value
с. same as
d. double of the original value
Transcribed Image Text:Choose the right answer 1. The mean Nusselt number for fully developed laminar flow in a circular tube under a constant heat flux a. depends on Reynolds number b. depends on Prandtl number c. is constant 2. The value of Prandtl number for air is about а. О.1 b. 0.3 с. 0.7 3. In natural convection heat transfer, the Nusselt number is a function of a. Re and Pr b. Re and Gr c. Grand Pr 4. A fluid is flowing along a plate having a high uniform wall temperature. The heat transfer along the length a. decreases b. remain constant c. increases 5. For fully developed laminar flow and heat transfer in a heated long circular tube, if the flow velocity is doubled and the tube diameter is halved, the heat transfer coefficient will be a. four times of the original value before b. half of the original value с. same as d. double of the original value
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