Fox and McDonald's Introduction to Fluid Mechanics
9th Edition
ISBN: 9781118912652
Author: Philip J. Pritchard, John W. Mitchell
Publisher: WILEY
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Textbook Question
Chapter 2, Problem 76P
What is the Reynolds number of water at 20°C flowing at 0.25 m/s through a 5-mm-diameter tube? If the pipe is now heated, at what mean water temperature will the flow transition to turbulence? Assume the velocity of the flow remains constant.
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Water at a temperature of 80oC (coefficient of viscosity is 0.357 centipoise) is flowing at a speed of 200 cm/s through a pipe of radius 2 mm. What is the nature of flow? What is the maximum velocity for it to remain laminar? What is the minimum velocity that will make the flow turbulent?
You are asked to calculate the pressure drop in a
straight pipe. Air of density 1.225 kg/m³ is flowing
through the pipe. The diameter of the pipe is 25
mm. The velocity of the flow is 1 m/s. The viscosity
of air is given as 1.85 x 10-5 Pas.
From this information the Reynolds number was
calculated to be 1655.
Determine the Head drop if the pipe is 100 m in
length.
Hint: For laminar flow the fanning friction factor can
be calculated as 16/Re
4 fLū²
hs
2gD
2
Answer:
Answer
An electronic device is cooled by water flowing through capillary holes drilled in the casing as shown
in below figure. The temperature of the device casing is constant at 353 K. The capillary holes are 0.3
m long and 2.54x10-3 m in diameter. If water enters at a temperature of 333 K and flows at a velocity
of 0.2 m/s, calculate the outlet temperature of the water.
0.3 m
0000000000
Surface
Water
333 K
0.2 m/s 2.54 x 10m
temperature = 353 K
Water
Capillary holes
Single capillary
Chapter 2 Solutions
Fox and McDonald's Introduction to Fluid Mechanics
Ch. 2 - For the velocity fields given below, determine:...Ch. 2 - For the velocity fields given below, determine:...Ch. 2 - A viscous liquid is sheared between two parallel...Ch. 2 - For the velocity field V=Ax2yi+Bxy2j, where A = 2...Ch. 2 - A fluid flow has the following velocity...Ch. 2 - When an incompressible, nonviscous fluid flows...Ch. 2 - For the free vortex flow the velocities are t =...Ch. 2 - For the forced vortex flow the velocities are t =...Ch. 2 - A velocity field is specified as V=axyi+by2j,...Ch. 2 - A velocity field is given by V=ax3i+bxy3j, where a...
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