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 Prandtl number for a flowing fluid greater than unity indicates that the hydrodynamic boundary layer thickness is a. less than the thermal boundary layer thickness b. equal to the thermal boundary layer thickness c. greater than the thermal boundary layer thickness 3. In natural convection heat transfer, the Nusselt number is a function of a. Re and Pr b. Re and Gr c. Gr and Pr 4. A fluid is flowing coefficient along the length a. decreases long a plate ng a uniform heat flux. The local transfer 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 b. half of the original value a. four times of the original value before c. same as d. double of the original value

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 Prandtl number for a flowing fluid greater than unity indicates that the hydrodynamic boundary layer thickness is a. less than the thermal boundary layer thickness b. equal to the thermal boundary layer thickness c. greater than the thermal boundary layer thickness 3. In natural convection heat transfer, the Nusselt number is a function of a. Re and Pr b. Re and Gr c. Gr and Pr 4. A fluid is flowing coefficient along the length a. decreases long a plate ng a uniform heat flux. The local transfer 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 b. half of the original value a. four times of the original value before c. same as d. double of the original value

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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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 Prandtl number for a flowing fluid greater than unity indicates that the
hydrodynamic boundary layer thickness is
a. less than the thermal boundary layer thickness b. equal to the thermal boundary layer
thickness
c. greater than the thermal boundary layer thickness
3. In natural convection heat transfer, the Nusselt number is a function of
a. Re and Pr
b. Re and Gr
c. Gr and Pr
4. A fluid is flowing
coefficient along the length
a. decreases
long a plate
ng a uniform heat flux. The local transfer
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
b. half of the original value
a. four times of the original value
before
c. same as
d. double of the original value

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4. For a thermally fully developed flow in a pipe for a fluid with constant properties, the local convection coefficient (a) Decreases as x-1/2 (b) Decreases as x-1/5 (c) Increase as x1/2 (d) Increases as x4/5 (e) Remains constant
Water flows through a tube of 5mm inside diameter with a volumetric flow rate of 7.8 cm3/s. Wall temperature of the tube is kept constant at 80oC. In a fully developed velocity and temperature profile region of 5m length, calculate the bulk temperature of exiting water if its inlet temperature is 20oC
Please help me get the correct answer quickly, please. :((
Laminar flow normally persists on a smooth flat plate until a critical Reynolds number value is reached. However, the flow can be tripped to a turbulent state by adding roughness to the leading edge of the plate. For a particular situation, experimental results show that the local heat transfer coefficients for laminar and turbulent conditions are hlam (x) = Alamæª htur (x) - Aturæb Alam = 1.98 a = -0.5 Atur = 4.15 b = -0.3 Calculate the average heat transfer coefficients for laminar and turbulent conditions for plates of length L = 0.2 m and 2.5 m.