California State University, Northridge



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|College of Engineering and Computer Science

Mechanical Engineering Department

Mechanical Engineering 390

Fluid Mechanics | |

| |Spring 2008 Number: 11971 Instructor: Larry Caretto |

Solutions to Third Quiz – Bernoulli Equation

Air is drawn from the atmosphere into a wind tunnel that is used for measuring drag on automobiles as shown in the figure at the right. Determine (a) the manometer reading, h, when the velocity in the test section is 60 mph and (b) the stagnation pressure on the front of the car. Notre that there is a 1 in column of oil on the top of the water in the right side of the manometer, and (b) (Figure P3.27 and problem 3.27 taken from Munson et al., Fluid Mechanics.)

We start with the Bernoulli equation written between point (1), the atmosphere from where the air is drawn and point (2) the streamline above the right side of the manometer. Writing Bernoulli’s equation between these two points gives.

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We will assume that the velocity in the atmosphere is very slow compared to that in the wind tunnel so that V12 ................
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