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Class8_CV_conservation_of_mass

# Class8_CV_conservation_of_mass - 6 7 8 Example Water at 20...

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Computer simulation Of a ???????? Laboratory for Computational Science and Engineering University of Minn. 9/16/2010 1 ES330, Section 2 Dr. Douglas Bohl 239 Camp x6683, [email protected] www.clarkson.edu/~dbohl/es330

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Outline The Conservation of Mass – Equation from the RTT – Simplifications – Examples 2 Learning Objective: Be able to solve the mass flow through a control volume using the integral conservation of mass HW#4 is posted on the web.
Types of Control Volumes • Fixed: • Moving: 3 • Deforming:

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Moving Control Volumes 4
Rules for Control Volumes You must draw it!!! Look at problem and see where you have information and where you need answers Pick Control Surfaces where you either 5 have information or need a solution Try to pick velocity vector and unit normal vector in the same direction You must draw it!!!!!!!!!

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The Conservation of Mass 6
7

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8
Example

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Unformatted text preview: 6 7 8 Example Water at 20 ° C flows through the contraction shown. The mass flow rate is 40 kg/s. The D 1 is 18 cm and D 2 is 5 cm. What are the average velocities at 1 and 2? 1 2 9 10 Example A hydraulic jump is in place downstream from a spillway as shown in the figure. Upstream of the jump the depth of the stream is 0.6 ft and the average velocity is 18 ft/s. Just downstream of the jump the average velocity is 3.4 ft/s. Calculate the height of the stream, h, just downstream of the jump. 11 12 Example Water at 20 ° C flows into a tank at section 1 and by a pipe as shown. The velocity at section 1 is uniform and has a speed of V 1 = 3 m/s. The volume flow rate through The pipe is Q=0.01 m 3 /s. If the water level h is constant what is the average velocity at the exit (V 2 )? 13 14...
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Class8_CV_conservation_of_mass - 6 7 8 Example Water at 20...

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