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 5.3P
Evaluate the Nusselt number for flow over a sphere for the following conditions:
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The velocity profile for laminar flow between two plates, as in Fig.3, is
2umaxy(h-y)
h4
u=
If the wall temperature is Tw at both walls, use the incompressible flow energy equation to solve for
the temperature distribution T (y) between the walls for steady flow.
Energy equation:
dT
pcp dt
y=h
y=0
•= kV²T +4
u(y)
v=W=0
Tw
T(y)
Fig.3. Fluid flow between two walls
A liquid with µ = 1.5x10-3 kgf.s / m2 flows over a horizontal wall. Calculate velocity gradient and shear stress at the limits and points located at 1, 2, 3 cm from its surface. Suppose a destruction of parabolic speed. THE parabola has its apex at point A and the origin of the axis system is at B.
If a vertical wall at temperature T, is surrounded by a fluid
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au
ди.
p(u-+ v) = PB(T – T)g + µ-
ди
ay
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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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