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

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

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Properties of Fluids

The term fluid represents a type of substance that can easily change its shape under any external pressure/force and can flow. Fluids can acquire any shape in which it is stored and can resist normal stresses but cannot resist shear stress in rest condition. Whenever external shear stress is applied to fluids, it starts to flow. The fluids may be liquid or gas. Example- water, air, etc.

Question

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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