ME345_Lecture_41

# ME345_Lecture_41 - mercury ρ = 13,600 kg/m 3 as the...

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M E 345 Spring 2008 Professor John M. Cimbala Lecture 41 04/25/2008 Today, we will : Finish our discussion about Pitot-static probes and other kinds of pressure probes, and do an example problem Review the pdf module: Linear Velocity Measurement Discuss some additional items not in the pdf notes: Bragg cell shifting in LDV systems, cinema vs. standard PIV systems Do C a n d y Q u e s t i o n s f o r C a n d y F r i d a y If time, begin to review the pdf module: Volume and Mass Flow Rate Measurement

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Example Given : A Pitot-static probe is placed in an air jet to measure the air speed. The differential pressure is measured with a U-tube manometer that uses

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Unformatted text preview: mercury ( ρ = 13,600 kg/m 3 ) as the manometer fluid. The difference in column height between the two legs of the manometer is h = 1.20 cm. To do : Calculate the air speed at the location of the Pitot-static probe. Solution : Hg Manometer h air V V j Example Given : Doppler radar is used to measure the speed of a baseball as sketched (not to scale). The radar frequency is 12,000 MHz. To do : Calculate the maximum angle θ that will yield less than 1% error in measuring the speed of the baseball. Solution : V Pitcher’s mound Doppler radar...
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ME345_Lecture_41 - mercury ρ = 13,600 kg/m 3 as the...

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