Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN: 9781305387102
Author: Kreith, Frank; Manglik, Raj M.
Publisher: Cengage Learning
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Chapter 5, Problem 5.19P
Suppose that the graph below shows measured values of
Write an appropriate dimensionless correlation for the average Nusselt number for these data and state any limitations to your equation.
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Storage is required for 35000 kg of propane, received as a gas at 10 °C and 1 atm. Your
engineering team was tasked to propose a suitable method of storage. One of the
proposed methods is to store the gas in a cylinder tank as gas at 10 °C and 1 atm. You
need to calculate the volume of the tank required to support your proposal. You decided
to use the truncated Virial Equation to find the volume required. Discuss whether the
proposed storage can be implemented in terms of the dimension of the tank and cost.
The power P required for operating a pump depends on the diameter of the pump D, the pressure rise Ap across the pump, the fluid density p, the fluid viscosity and the
Theorem, and D, Q and p as the repeating variables, the dimensionless group associated with μ is given by
volume flow rate Q through the pump. Using Buckingham's
μDªQbpº. Determine the values of a, b and c.
1. [0.99, 1.01
2. [-1.01, 0.99
3. [-1.01, -0.99
a=
b =
C=
(6)
A dimensionless group called the Reynolds number is defined for a flow in a pipe or tube
DV p
NRe
%3D
uV/D
Where V is the average velocity in the pipe, p is the fluid density, u is the fluid viscosity, D is the tube
diameter. The second form of the group indicates that it is a ratio of the convective (turbulent)
momentum flux to the molecular (viscous) momentum flux, or the ratio of inertial forces (which are
destabilizing) to viscous forces (which are stabilizing). When viscous forces dominate over inertial
forces, the flow is laminar and fluid elements flow in smooth, straight streamlines, whereas when inertial
forces dominate, the flow is unstable and the flow pattern break up into random fluctuating eddies It is
found that laminar flow in a pipe occurs as long as the value of Reynolds number is less than 2000.
Calculate the maximum velocity and the corresponding flow rate (in cm'/s) at which lamina: tlow
of water is possible in tubes with the following diameters:
0.64,
1.27,…
Chapter 5 Solutions
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
Ch. 5 - Evaluate the Reynolds number for flow over a tube...Ch. 5 - 5.2 Evaluate the Prandtl number from the following...Ch. 5 - Evaluate the Nusselt number for flow over a sphere...Ch. 5 - 5.4 Evaluate the Stanton number for flow over a...Ch. 5 - Evaluate the dimensionless groups hcD/k,UD/, and...Ch. 5 - 5.6 A fluid flows at 5 over a wide, flat plate 15...Ch. 5 - 5.7 The average Reynolds number for air passing in...Ch. 5 - Prob. 5.8PCh. 5 - When a sphere falls freely through a homogeneous...Ch. 5 - 5.10 Experiments have been performed on the...
Ch. 5 - 5.13 The torque due to the frictional resistance...Ch. 5 - The drag on an airplane wing in flight is known to...Ch. 5 - 5.19 Suppose that the graph below shows measured...Ch. 5 - Engine oil at 100C flows over and parallel to a...Ch. 5 - For flow over a slightly curved isothermal...Ch. 5 - Air at 20C flows at 1 m/s between two parallel...Ch. 5 - Air at 1000C flows at an inlet velocity of 2 m/s...Ch. 5 -
5.43 A refrigeration truck is traveling at 130...Ch. 5 - The air-conditioning system in a Chevrolet van for...Ch. 5 - Determine the rate of heat loss from the wall of a...
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