Automotive Technology: Principles, Diagnosis, and Service (5th Edition)
5th Edition
ISBN: 9780133994612
Author: James D. Halderman
Publisher: PEARSON
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Textbook Question
Chapter 30, Problem 1RQ
What is meant by the term crossflow head?
Expert Solution & Answer
To determine
Define crossflow head.
Explanation of Solution
Crossflow head:
The placement of valve in the cylinder head plays an important role in determining the breathing efficiency. When the intake and exhaust valves are placed opposite to each other in a combustion chamber, an easy way is created from the intake port to exhaust port through the combustion chamber and is referred to as crossflow head design.
In crossflow head design, the flow enters and leaves the combustion chamber in opposite directions in the cylinder head.
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Q1. A curved beam of a circular cross section of diameter "d" is fixed at one end and
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You are working as an engineer in a bearing systems design company. The flow of
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The top plate, representing the moving part of the bearing, travels at a constant speed,
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applying the above approximations to the Navier-Stokes equations and assuming that
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y = +h
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x1
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Figure Q1: Flow in a hydrodynamic bearing. The plates extend a width, W = 20 cm,
into the page.
Question 1
You are working as an engineer in a bearing systems design company. The flow of
lubricant inside a hydrodynamic bearing (µ = 0.001 kg m¯¹ s¯¹) can be approximated
as a parallel, steady, two-dimensional, incompressible flow between two parallel plates.
The top plate, representing the moving part of the bearing, travels at a constant speed,
U, while the bottom plate remains stationary (Figure Q1). The plates are separated by
a distance of 2h = 1 cm and are W = 20 cm wide. Their length is L = 10 cm. By
applying the above approximations to the Navier-Stokes equations and assuming that
end effects can be neglected, the horizontal velocity profile can be shown to be
1 dP
u(y)
=
2μ dx
-y² + Ay + B
y= +h
Ꮖ
2h=1 cm
1
x1
y = −h
moving plate
stationary plate
2
X2
L = 10 cm
Figure Q1: Flow in a hydrodynamic bearing. The plates extend a width, W = 20 cm,
into the page.
(a) By considering the appropriate boundary conditions, show that the constants take
the following forms:
U
U
1 dP
A =…
Chapter 30 Solutions
Automotive Technology: Principles, Diagnosis, and Service (5th Edition)
Ch. 30 - What is meant by the term crossflow head?Ch. 30 - Prob. 2RQCh. 30 - What is the recommended cylinder head...Ch. 30 - What are the advantages of using four valves per...Ch. 30 - Cylinder heads with four valves flow more air than...Ch. 30 - Two technicians are discussing a Hemi engine....Ch. 30 - Technician A says that an Audi five-valve engine...Ch. 30 - The gasket surface of a cylinder head, as measured...Ch. 30 - A warped aluminum cylinder head can be restored to...Ch. 30 - Some vehicle manufacturers recommend repairing...
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