Elementary Mechanics of Fluids. CE 319 F Daene McKinney. Bernoulli Equation. Euler Equation. Fluid element accelerating in l direction & acted on by pressure and weight forces only (no friction) Newton’s 2 nd Law. Flow. l. 30 o. Ex (5.1).
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CE 319 F
V1/2=(80+30)/2 ft/s = 55 ft/s
dV/dx =(80-30) ft/s /1 ft = 50 ft/s/ft
3Example – Venturi Tube
Nozzle: velocity increases, pressure decreases
Diffuser: velocity decreases, pressure increases
Similarly for 2 3, or 1 3
Pressure drop is fully recovered, since we assumed no frictional losses
Knowing the pressure drop 1 2 and d/D, we can calculate the velocity and flow rate
Air conditioning (~ 60 oF)
Heating (~ 170 oF)
1Stagnation Tube in a Pipe
yPitot Tube Application (p.170)