Fluid Mechanics Fundamentals And Applications
3rd Edition
ISBN: 9780073380322
Author: Yunus Cengel, John Cimbala
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 6, Problem 12CP
Describe in terms of momentum and airflow how a helicopter is able to hover .
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Describe Applications of momentum equations.
QUESTION 1
A jet of freshwater strikes a series of vanes of a turbine at 25° with the direction of
motion and leaves it at 150° absolute with the direction of motion. The absolute inlet
velocity of the jet is 25 m/s and the vanes move at a velocity of 10 m/s. Ignore friction
across the vanes. Calculate:
1.1 the vane inlet angle.
1.2 the vane outlet angle.
1.3 the power/kg of water and,
1.4 the hydraulic efficiency.
QUESTION 2
A pipeline of 50 mm diameter and 4.5 km length connects two reservoirs whose
constant difference of water level is 12 m. A branch pipe 1.25 km long and taken from
a point distance of 1.5 km from reservoir A, leads to reservoir C whose water level is
15 m below that of reservoir A. Find the diameter of the branch pipe so that the flow
into both the reservoirs is the same. Assume the coefficient of friction for each pipe,
f = 0.0075, and neglect minor losses.
QUESTION 3
The plunger diameter of a single-acting reciprocating pump is 115 mm and the stroke
is 230 mm.…
A jet of water 75 mm in diameter and moving to the right with a velocity of 25 m/s impinges on a flat plate which is moving in the same direction as the jet with a velocity of 10 m/s. What force would the jet exert on the plate?
Chapter 6 Solutions
Fluid Mechanics Fundamentals And Applications
Ch. 6 - Express Newton’s first, second, and third laws.Ch. 6 - Express Newton’s second law of motion for rotating...Ch. 6 - Is momentum a vector? If so, in what direction...Ch. 6 - Express the conservation of momentum principle....Ch. 6 - Two firefighters are fighting a fire with...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 - 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 - A horizontal water jet from a nozzle of constant...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 - Water enters a 10-cm-diameter pipe steadily with a...Ch. 6 - A 2.5-cm-diameter horizontal water jet with a...Ch. 6 - A horizontal water jet of constant velocity V...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 - A reducing elbow in a horizontal pipe is used to...Ch. 6 - Repeat Prob. 6-24 for the case of = 125°.Ch. 6 - Reconsider Prob. 627. If the mass of the cart is...Ch. 6 - A 100-ft3/s water jet is moving in the positive...Ch. 6 - Reconsider Prob. 6-26E. Using appropriate...Ch. 6 - A horizontal 5-cm-diameter water jet with a...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 - A 3-in-diameter horizontal water jet having a...Ch. 6 - An unloaded helicopter of mass 12,000 kg hovers at...Ch. 6 - Water is flowing through a 10-cm-diameter water...Ch. 6 - The weight of a water tank open to the atmosphere...Ch. 6 - Commercially available large wind turbines have...Ch. 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 - An incompressible fluid of density and viscosity ...Ch. 6 - Water of density =998.2kg/m3 flows through a...Ch. 6 - Water flowing in a horizontal 25-cm-diameter pipe...Ch. 6 - A sluice gate, which controls flow rate in a...Ch. 6 - How is the angular momentum equation obtained from...Ch. 6 - Prob. 52CPCh. 6 - Prob. 53CPCh. 6 - Prob. 54CPCh. 6 - Water is flowing through a 15-cm-diameter pipe...Ch. 6 - A large lawn sprinkler with two identical arms is...Ch. 6 - Prob. 57EPCh. 6 - Prob. 58PCh. 6 - The impeller of a centrifugal blower has a radius...Ch. 6 - Prob. 60PCh. 6 - Repeat Prob. 6-56 for a water flow rate of 60 L/s.Ch. 6 - Prob. 62PCh. 6 - Water enters the impeller of a centrifugal pump...Ch. 6 - A lawn sprinkler with three identical antis is...Ch. 6 - Prob. 66PCh. 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 - Prob. 70PCh. 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. 73PCh. 6 - Prob. 74PCh. 6 - Prob. 75PCh. 6 - Prob. 76PCh. 6 - A spacecraft cruising in space at a constant...Ch. 6 - A 60-kg ice skater is standing on ice with ice...Ch. 6 - Prob. 80PCh. 6 - Water is flowing into and discharging from a pipe...Ch. 6 - Indiana Jones needs So ascend a 10-m-high...Ch. 6 - Prob. 83EPCh. 6 - Prob. 84PCh. 6 - A walnut with a mass of 50 g requires a force of...Ch. 6 - Prob. 86PCh. 6 - Prob. 87PCh. 6 - Show that the force exerted by a liquid jet on a...Ch. 6 - Prob. 89PCh. 6 - Prob. 90PCh. 6 - Prob. 91PCh. 6 - Water enters a two-armed lawn sprinkler along the...Ch. 6 - Prob. 94PCh. 6 - Prob. 95PCh. 6 - Prob. 96PCh. 6 - Water flows steadily through a splitter as shown...Ch. 6 - Prob. 98PCh. 6 - Prob. 99PCh. 6 - Consider water flow through a horizontal, short...Ch. 6 - Consider water flow through a horizontal. short...Ch. 6 - Prob. 103PCh. 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 - Prob. 112PCh. 6 - Consider the impeller of a centrifugal pump with a...Ch. 6 - Prob. 114P
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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 propeller on an airboat used in the Florida Everglades moves air at the rate of 40 kg/s. When at rest, the speed of the slipstream behind the propeller is 40 m/s ata location where the pressure is atmospheric. Calculate (@) the propeller diameter, (b) the thrust produced at rest, and () the thrust produced when the airboat is moving ahead at 10 m/s, if the mass flow rate through the propeller remains constant,arrow_forwardWater leaves a hose at a rate of 3.6-kg per 2.0-s with a speed of 19.3-m/s and is aimed at a toy car at the exact moment the car is hit the water slows down to 4.0-m/s (That is, we ignore any splashing back.) What is the force exerted by the water on the toy car?arrow_forwardThe adjacent picture shows a pipe section in which a reduction sleeve (nozzle) is connected to the pipe by a flanged bolted connection. You have D1=8 cm, D2=5 cm, and the water is at 20C. Point 2 is open to the atmosphere. Consider that the specific mass of the water is 1,000 kg/m3, and that the momentum flux correction factor is unity. If V1=5 m/s and the mercury manometer indicates that h=58 cm, determine the reaction force on the flange bolts.arrow_forward
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- (Linear momentum) A nozzle is attached to an 77.1-mm inside-diameter flexible hose. The nozzle area is 482 mm2. If the delivery pressure of water at the nozzle inlet is 652 kPa. (a) determine the anchoring force must be exerted by the hands holding the hose and nozzle stationary. i Ib (b) Could you hold the hose and nozzle stationary?arrow_forwardThe figure below shows the configuration of the center (tail-mounted) jet engine on an airliner. The airliner is cruising at altitude, and the velocities shown are relative to an observer on board. At this condition mfuel 4 kg/s and p₁ = Pamb = 30 kPa. D₁ = 1.0 m V₁ = 250 m/s P₁ = 0.4 kg/m³ P1 = Pamb mtuel Engine F = thrust force of engine on plane D₂ = 0.75 m P2 = 0.44 kg/m³ P2 = 63 kPa (nozzle exit only) Calculate the thrust force that the engine exerts on the airplane. F= i kNarrow_forwardA horizontal water jet of constant velocity V impinges normally on a vertical flat plate and splashes off the sides in the vertical plane. The plate is moving toward the oncoming water jet with velocity 1/2V. If a force F is required to maintain the plate stationary, how much force is required to move the plate toward the water jet?arrow_forward
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