Fluid Mechanics: Fundamentals and Applications
4th Edition
ISBN: 9781259696534
Author: Yunus A. Cengel Dr., John M. Cimbala
Publisher: McGraw-Hill Education
expand_more
expand_more
format_list_bulleted
Videos
Textbook Question
Chapter 6, Problem 43P
As a follow-up to Prob. 6-41, it turns out that for a large enough area ratio A2,/A1, the inlet pressure is actually smaller than the outlet pressure! Explain how this can be true in light of the fact that there is friction and other irreversibilities due to turbulence, and pressure must be lost along the axis of the duct to overcome these irreversibilities.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Repeat the fl at-plate momentum analysis byreplacing Eq. given with the simple but unrealistic linearvelocity profi le suggested by Schlichting [1]:u/U≈y/δ for 0 ≤y ≤δCompute momentum–integral estimates of cf, θ/x, δ*/x, andH.
What is the Betz limit on wind turbines? Derive the Betz limit by writing the necessary admissions with the continuity and Bernoulli equation. State its meaning and importance.
Roman aqueduct customersobtained extra water by attaching a diffuser to theirpipe exits. Fig. shows a simulation: a smooth inletpipe, with or without a 15° conical diffuser expanding to a5-cm-diameter exit. The pipe entrance is sharp-edged. Calculatethe fl ow rate (a) without and (b) with the diffuser.
Chapter 6 Solutions
Fluid Mechanics: Fundamentals and Applications
Ch. 6 - Express Newton’s second law of motion for rotating...Ch. 6 - Express Newton’s first, second, and third laws.Ch. 6 - Is momentum a vector? If so, in what direction...Ch. 6 - Express the conservation of momentum principle....Ch. 6 - How do surface forces arise in the momentum...Ch. 6 - Explain the importance of the Reynolds transport...Ch. 6 - What is the importance of the momentum-flux...Ch. 6 - Write the momentum equation for steady...Ch. 6 - In the application of the momentum equation,...Ch. 6 - Two firefighters are fighting a fire with...
Ch. 6 - A rocket in space (no friction or resistance to...Ch. 6 - Describe in terms of momentum and airflow how a...Ch. 6 - Does it take more, equal, or less power for a...Ch. 6 - In a given location, would a helicopter require...Ch. 6 - Describe body forces and surface forces, and...Ch. 6 - A constant-velocity horizontal water jet from a...Ch. 6 - A horizontal water jet of constant velocity V from...Ch. 6 - A horizontal water jet from a nozzle of constant...Ch. 6 - A 2.5-cm-diameter horizontal water jet with a...Ch. 6 - A 90 elbow in a horizontal pipe is used to direct...Ch. 6 - Repeat Prob. 6-20 for the case of another...Ch. 6 - A horizontal water jet impinges against a vertical...Ch. 6 - Water enters a 7-cm-diameter pipe steadily with a...Ch. 6 - A reducing elbow in a horizontal pipe is used to...Ch. 6 - Repeat Prob. 6-24 for the case of = 125°.Ch. 6 - A 100-ft3/s water jet is moving in the positive...Ch. 6 - Reconsider Prob. 6-26E. Using appropriate...Ch. 6 - Commercially available large wind turbines have...Ch. 6 - A fan with 24-in-diameter blades moves 2000 cfm...Ch. 6 - A 3-in-diameter horizontal jet of water, with...Ch. 6 - Firefighters are holding a nozzle at the end of a...Ch. 6 - A 5-cm-diameter horizontal jet of water with a...Ch. 6 - Prob. 33PCh. 6 - A 3-in-diameter horizontal water jet having a...Ch. 6 - An unloaded helicopter of mass 12,000 kg hovers at...Ch. 6 - Prob. 36PCh. 6 - Water is flowing through a 10-cm-diameter water...Ch. 6 - Water flowing in a horizontal 25-cm-diameter pipe...Ch. 6 - Prob. 39PCh. 6 - Water enters a centrifugal pump axially at...Ch. 6 - An incompressible fluid of density and viscosity ...Ch. 6 - Consider the curved duct of Prob. 6-41, except...Ch. 6 - As a follow-up to Prob. 6-41, it turns out that...Ch. 6 - Prob. 44PCh. 6 - The weight of a water tank open to the atmosphere...Ch. 6 - A sluice gate, which controls flow rate in a...Ch. 6 - A room is to be ventilated using a centrifugal...Ch. 6 - How is the angular momentum equation obtained from...Ch. 6 - Prob. 49CPCh. 6 - Prob. 50CPCh. 6 - Prob. 51CPCh. 6 - A large lawn sprinkler with two identical arms is...Ch. 6 - Prob. 53EPCh. 6 - The impeller of a centrifugal pump has inner and...Ch. 6 - Water is flowing through a 15-cm-diameter pipe...Ch. 6 - Prob. 56PCh. 6 - Repeat Prob. 6-56 for a water flow rate of 60 L/s.Ch. 6 - Prob. 58PCh. 6 - Water enters the impeller of a centrifugal pump...Ch. 6 - A lawn sprinkler with three identical antis is...Ch. 6 - Prob. 62PCh. 6 - The impeller of a centrifugal blower has a radius...Ch. 6 - An 8-cm-diameter horizontal water jet having a...Ch. 6 - Water flowing steadily at a rate of 0.16 m3/s is...Ch. 6 - Repeat Prob. 6-66 by taking into consideration the...Ch. 6 - A 16-cm diameter horizontal water jet with a speed...Ch. 6 - Water enters vertically and steadily at a rate of...Ch. 6 - Repeal Prob. 6-69 for the case of unequal anus-the...Ch. 6 - Prob. 71PCh. 6 - Prob. 72PCh. 6 - A spacecraft cruising in space at a constant...Ch. 6 - A 60-kg ice skater is standing on ice with ice...Ch. 6 - A 5-cm-diameter horizontal jet of water, with...Ch. 6 - Water is flowing into and discharging from a pipe...Ch. 6 - Indiana Jones needs So ascend a 10-m-high...Ch. 6 - Prob. 79EPCh. 6 - A walnut with a mass of 50 g requires a force of...Ch. 6 - Prob. 81PCh. 6 - Prob. 82PCh. 6 - A horizontal water jet of constant velocity V...Ch. 6 - Show that the force exerted by a liquid jet on a...Ch. 6 - Prob. 85PCh. 6 - Prob. 86PCh. 6 - Water enters a mixed flow pump axially at a rate...Ch. 6 - Prob. 88PCh. 6 - Water enters a two-armed lawn sprinkler along the...Ch. 6 - Prob. 91PCh. 6 - Prob. 92PCh. 6 - Prob. 93PCh. 6 - Prob. 94PCh. 6 - A water jet strikes a moving plate at velocity...Ch. 6 - Water flows at mass flow rate m through a 90°...Ch. 6 - Prob. 97PCh. 6 - Water shoots out of a Iar2e tank sitting a cart...Ch. 6 - Prob. 99PCh. 6 - Prob. 100PCh. 6 - Prob. 101PCh. 6 - Consider water flow through a horizontal, short...Ch. 6 - Consider water flow through a horizontal. short...Ch. 6 - Prob. 104PCh. 6 - Prob. 105PCh. 6 - Prob. 106PCh. 6 - The velocity of wind at a wind turbine is measured...Ch. 6 - The ve1ocity of wind at a wind turbine is measured...Ch. 6 - Prob. 109PCh. 6 - Prob. 110PCh. 6 - Prob. 111PCh. 6 - Consider the impeller of a centrifugal pump with a...Ch. 6 - Prob. 113PCh. 6 - Prob. 114P
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- The cylindrical container in Fig. is 20 cm in diameterand has a conical contraction at the bottom with an exithole 3 cm in diameter. The tank contains fresh water atstandard sea-level conditions. If the water surface is fallingat the nearly steady rate dh/dt ≈ - 0.072 m/s, estimate theaverage velocity V out of the bottom exit.arrow_forwardShow that the axisymmetric potential flow formed by the superpositionof a point source +m at (x, y) = (-a, 0), a pointsink -m at (+a, 0), and a stream U∞ in the x-direction formsa Rankine body of revolution as in Fig. P8.95. Find analyticexpressions for determining the length 2L and maximumdiameter 2R of the body in terms of m, U∞, and a.arrow_forwardWater at 20 ° C fl ows through the elbow in Fig. P3.60 andexits to the atmosphere. The pipe diameter is D 1 = 10 cm,while D 2 = 3 cm. At a weight fl ow rate of 150 N/s, thepressure p 1 = 2.3 atm (gage). Neglecting the weight ofwater and elbow, estimate the force on the fl ange bolts atsection 1.arrow_forward
- A 3-in diameter horizontal water jet having a velocity of 140 ft/s strikes a curved plate, which deflects the water 180 degrees at the same speed. Ignoring the frictional effects, determine the force required to hold the plate against the water stream. Please no conversion need it, only the 3in into .25feet, please. for me, I got 3.71KN on the x-axis.arrow_forwardCan you answer this without the application of the moments. Please help with this. the answer must be: T= 6.1953s max. velocity = 0.4057in/sarrow_forwardA power plant discharges cooling water through the manifoldin Fig. which is 55 cm in diameter and 8 m highand is perforated with 25,000 holes 1 cm in diameter. Does this manifold simulate a line source? If so, what is theequivalent source strength m?arrow_forward
- Consider Fig. P3.36 as a general problem for analysis of amixing ejector pump. If all conditions ( p , ρ , V ) are knownat sections 1 and 2 and if the wall friction is negligible,derive formulas for estimating ( a ) V 3 and ( b ) p 3 .arrow_forwardIn deriving the continuity equation, we assumed, for simplicity,that the mass fl ow per unit area on the left face wasjust ρ u . In fact, ρ u varies also with y and z , and thus it mustbe different on the four corners of the left face. Account forthese variations, average the four corners, and determinehow this might change the inlet mass fl ow from ρ u dy dz .arrow_forward5. Consider a Pitot probe in high-speed flow.(a) Give the value of the stagnation pressure to the freestream pressure p0/p∞ for airand M∞ = 1. Assume stagnation is reached isentropically.(b) How is the value found in part (a) important for Pitot problems? As part ofyour discussion, include what the flow field looks like for different cases and thedifferent assumptions that have to be made.arrow_forward
- pls replyy Gasoline (SG-0.7) flows down an inclined pipe whose upper and lower sections are 90 mm (section 1) and 60 mm (section 2) in diameter respectively. The pressure and velocity in section 1 are 280 kPa and 2.3 m/s respectively. If the difference in elevation between the 2 sections is 2.5m, find the pressure at point 2.arrow_forwardIn Prob. it would be difficult to solve for Ω because of itappears in all three of the dimensionless pump coefficients.Suppose that, in Prob. 5.61, Ω is unknown but D = 12 cmand Q = 25 m 3 /h. The fluid is gasoline at 20 ° C. Rescale thecoefficients, , to make a plot ofdimensionless power versus dimensionless rotation speed.Enter this plot to find the maximum rotation speed Ωforwhich the power will not exceed 300 W.arrow_forwardHint: take partial derivatives of the given shallow water equations and subtract them, e.g. d(eq2)/dx - d(eq1)/dy, and look for bits that make up vorticity, vorticity advection and divergencearrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning
Principles of Heat Transfer (Activate Learning wi...
Mechanical Engineering
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Cengage Learning
Physics 33 - Fluid Statics (1 of 10) Pressure in a Fluid; Author: Michel van Biezen;https://www.youtube.com/watch?v=mzjlAla3H1Q;License: Standard YouTube License, CC-BY