# Lab8 - 4.1.3 W51” 3E 319E Elementary Fluid Mechanics...

• Lab Report
• 1

This preview shows page 1. Sign up to view the full content.

This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 4.1.3 W51” 3E 319E Elementary Fluid Mechanics Momentum La oratory Jame Date I]! ilﬁy 147"” Lab time 2/ Mfg-w AIR FLOW AROUND A BEND 1) Determine the volumetric flow rate and the average velocity in the bend. To apply the momentum ,equation for steady flow through the bend, it is necessary to know the inﬂow and the outﬂow velocities. Since size of the bend is constant, the cross sectional average velocity is constant. The acceleration comes primarily from changing the direction of the velocity, not from changing its magnitude. The ﬂow rate can be determined by using the contracting nozzle above the elbow as a ﬂow meter. One pi-ezometer (#13 on the manometer board) is attached to the plenum chamber (pc, Fig. l") and another one (#14) is attached at the downstream end of the contraction (in). Since the pressure change is very small, the air may be assumed to be incompressible. Then, continuity gives @mm2Mmm A c 7’“ “(I [if-(”l Vin: prc ,7/1’ /'({' Air: Bernoulli’s equation may be applied along a streamline from pc to in since the effects of shear stress are negligble in this short distance with rapid acceleration of the ﬂow. Thus, V2 V2 P0 _. in WPC+ppc+p 2 ”ﬁfn'fpfn‘l'p 2 2 2 2 A- V- V' ﬂpc‘l'PPC +p in i3W1}? +pin +pi APC 2 2 Fig. 1 ~ Contracting Nozzle for Me 'n :(ppc_Pin) (2pc_za'n) ‘asun gQ For this apparatus, A?” >> A3,, and [ppc —pm)>> Azpc — Zin ). Thus, Vn x ghvpc ‘Pin) Procedure: a) Read the piezometers for pc and in and then convert those readings into a pressure difference. h14 = him I —4ﬁ cm 1113 = hpc — :3}; V5 CD1 ppc my. : mpg - aha/100 cm/rn = 98100;,” - hpcymo = Misﬁt ...
View Full Document

• Fall '08
• Staff
• Fluid Dynamics, Elementary Fluid Mechanics Momentum La, Momentum La oratory, sectional average velocity

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern