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
Textbook Question
Chapter 8, Problem 131P
A house built on a riverside is to be cooled iii summer by utilizing the cool water of the river. A 20-m-long section of a circular stainless-steel duct of 20-cui diameter passes through the water, Air flows through the underwater section of the duct at 4 m/s at an average temperature of 1 5.C. For an overall fan efficiency of 62 percent, determine the fan power needed to overcome the flow resistance in this section of the duct.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
3. Vertical turbines are to be used for flocculation in a water treatment plant with a
design flow rate of 189,270 m³/day. Flocculation is to be designed with two trains
and five compartments per train. The total detention time in this process is to be 25
minutes, and the average temperature of the water flowing into the plant is 10°C. The
velocity gradient in the first compartment is to be 70 s¹. Make the following design
decisions for the first compartment:
a) Determine the dimensions of the compartment.
b) Determine the diameter of the impeller.
c) Determine the water power required.
d) Determine the maximum rotational speed.
e) Estimate the pumping capacity of the impeller and circulation time in the
tank.
In a water Transfer installation, from the storage tank to the consumption tank, a pump is to be installed to circulate a flow rate of 60 lt/s. The 380 meter long Pipe is Made of cast iron of 150 mm diameter and consist of a check valve, a gate valve and 3 commercial elbows of medium Radius.The consumir tank is pressurized to 3.5 Kgf/cm2 gauge pressure.Determine the driving power of the KW pump if it's efficiency is 73%. Additional data, head loss factors:
- check valve 1,7
- Open gate valve Kv= 0,19
-commercial elbow of average Radius Kc= 0,75, per elbow.
- storage pond outlet sharp angles Ks = 0,5
- inlet to consumption pond Le = 1
- Pipe friction factor f = 0,029
A sudden enlargement in a circular duct measures 0.20 m diameter upstream and 0.40 m downstream. The upstream pressure is 150 Pa, the downstream pressure is 200 Pa. Determine the flow rate of 20°C air through the fitting, if density is 1.2041 kg/m3.
Group of answer choices
0.58 m3/s
0.38 m3/s
0.28 m3/s
0.48 m3/s
Chapter 8 Solutions
Fluid Mechanics: Fundamentals and Applications
Ch. 8 - How is the hydrodynamic entry length defined for...Ch. 8 - Why are liquids usually transported in circular...Ch. 8 - What is the physical significance of the Reynolds...Ch. 8 - Consider a person walking first in air and then in...Ch. 8 - Show that the Reynolds number for flow in a...Ch. 8 - Which fluid at room temperature requires a larger...Ch. 8 - What is the eneia1Iy accepted value of the...Ch. 8 - Consider the flow of air and wale in pipes of the...Ch. 8 - Consider laminar flow in a circular pipe. Is the...Ch. 8 - How does surface roughness affect the pressure...
Ch. 8 - What is hydraulic diameter? How is it defined?...Ch. 8 - Shown here is a cool picture of water being...Ch. 8 - What fluid property is responsible for the...Ch. 8 - In the fully developed region of flow in a...Ch. 8 - Someone claims that the volume flow rate in a...Ch. 8 - Someone claims that the average velocity in a...Ch. 8 - Someone claims that the shear stress at the center...Ch. 8 - Someone claims that in fully developed turbulent...Ch. 8 - How does the wall shear stress w , vary along the...Ch. 8 - How is the friction factor for flow in a pipe...Ch. 8 - Discuss whether fully developed pipe flow is one-,...Ch. 8 - Consider fully developed flow in a circular pipe...Ch. 8 - Consider fully developed laminar how in a...Ch. 8 - Explain why the friction factor is independent of...Ch. 8 - Consider laminar flow of air in a circular pipe...Ch. 8 - Consider fully developed laminar flow in a...Ch. 8 - How is head loss related to pressure loss? For a...Ch. 8 - What is turbulent viscosity? What caused it?Ch. 8 - What is the physical mechanism that causes the...Ch. 8 - The head toss for a certain circular pipe is given...Ch. 8 - The velocity profile for the fully developed...Ch. 8 - Water at 15°C (p = 999.1 kg/m3 and = 1.138 × 10-3...Ch. 8 - Water at 70F passes through...Ch. 8 - Heated air at 1 atm and 100F is to be transported...Ch. 8 - In fully developed laminar flow in a circular...Ch. 8 - The velocity profile in fully developed laminar...Ch. 8 - Repeat Prob. 8-36 for a pipe of inner radius 7 cm.Ch. 8 - Water at 10C (p = 999.7 kg/m3 and = 1.307 ×...Ch. 8 - Consider laminar flow of a fluid through a square...Ch. 8 - Repeat Prob. 8-39 for tribulent flow in smooth...Ch. 8 - Air enters a 10-m-long section of a rectangular...Ch. 8 - Consider an air solar collector that is 1 m wide...Ch. 8 - Oil with p = 876 kg/m3 and = 0.24 kg/m.s is...Ch. 8 - Glycenii at 40 C with p = l22 kg/m3 and = 0.27...Ch. 8 - Air at 1 atm and 60 F is flowing through a 1 ft ×...Ch. 8 - Oil with a density of 850 kg/m3 and kinematic...Ch. 8 - In an air heating system, heated air at 40 C and...Ch. 8 - Glycerin at 40 C with p = 1252 kg/m3 and = 0.27...Ch. 8 - Liquid ammonia at 20 C is flowing through a...Ch. 8 - Consider the fully developed flow of glycerin at...Ch. 8 - The velocity profile for a steady laminar flow in...Ch. 8 - The generalized Bernoulli equation for unsteady...Ch. 8 - What is minor loss in pipe flow? How is the minor...Ch. 8 - Define equivalent length for minor loss in pipe...Ch. 8 - The effect of rounding of a pipe inlet on the loss...Ch. 8 - The effect of rounding of a pipe exit on the loss...Ch. 8 - Which has a greater minor loss coefficient during...Ch. 8 - A piping system involves sharp turns, and thus...Ch. 8 - During a retrofitting project of a fluid flow...Ch. 8 - A horizontal pipe has an abrupt expansion from...Ch. 8 - Consider flow from a water reservoir through a...Ch. 8 - Repeat Prob. 8-62 for a slightly rounded entrance...Ch. 8 - Water is to be withdrawn from an 8-m-high water...Ch. 8 - A piping system equipped with a pump is operating...Ch. 8 - Water is pumped from a large lower reservoir to a...Ch. 8 - For a piping system, define the system curve, the...Ch. 8 - Prob. 68CPCh. 8 - Consider two identical 2-m-high open tanks tilled...Ch. 8 - A piping system involves two pipes of different...Ch. 8 - A piping system involves two pipes of different...Ch. 8 - A piping system involves two pipes of identical...Ch. 8 - Water at 15 C is drained from a large reservoir...Ch. 8 - Prob. 74PCh. 8 - The water needs of a small farm are to be met by...Ch. 8 - Prob. 76EPCh. 8 - A 2.4-m-diameter tank is initially filled with...Ch. 8 - A 3-m-diameter tank is initially filled with water...Ch. 8 - Reconsider Prob. 8-78. In order to drain the tank...Ch. 8 - Gasoline (p = 680 kg/m3 and v = 4.29 × 10-7 m2/s)...Ch. 8 - Prob. 81EPCh. 8 - Oil at 20 C is flowing through a vertical glass...Ch. 8 - Prob. 83PCh. 8 - A 4-in-high cylindrical tank having a...Ch. 8 - A fanner is to pump water at 70 F from a river to...Ch. 8 - A water tank tilled with solar-heated vater at 4OC...Ch. 8 - Two water reservoirs A and B are connected to each...Ch. 8 - Prob. 89PCh. 8 - A certain pail of cast iron piping of a water...Ch. 8 - Repeat Prob. 8-91 assuming pipe A has a...Ch. 8 - Prob. 93PCh. 8 - Repeat Prob. 8-93 for cast lion pipes of the same...Ch. 8 - Water is transported by gravity through a...Ch. 8 - Water to a residential area is transported at a...Ch. 8 - In large buildings, hot water in a water tank is...Ch. 8 - Prob. 99PCh. 8 - Two pipes of identical length and material are...Ch. 8 - What are the primary considerations when selecting...Ch. 8 - What is the difference between laser Doppler...Ch. 8 - Prob. 103CPCh. 8 - Prob. 104CPCh. 8 - Explain how flow rate is measured with...Ch. 8 - Prob. 106CPCh. 8 - Prob. 107CPCh. 8 - Prob. 108CPCh. 8 - A 15-L kerosene tank (p = 820 kg/m3) is filled...Ch. 8 - Prob. 110PCh. 8 - Prob. 111PCh. 8 - Prob. 112PCh. 8 - Prob. 113PCh. 8 - Prob. 114EPCh. 8 - Prob. 115EPCh. 8 - Prob. 116PCh. 8 - A Venturi meter equipped with a differential...Ch. 8 - Prob. 119PCh. 8 - Prob. 120PCh. 8 - Prob. 121PCh. 8 - Prob. 122EPCh. 8 - Prob. 123PCh. 8 - The flow rate of water at 20°C (p = 998 kg/m3 and ...Ch. 8 - Prob. 125PCh. 8 - Prob. 126PCh. 8 - Prob. 127PCh. 8 - The conical container with a thin horizontal tube...Ch. 8 - Prob. 129PCh. 8 - The compressed air requirements of a manufacturing...Ch. 8 - A house built on a riverside is to be cooled iii...Ch. 8 - The velocity profile in fully developed lamina,...Ch. 8 - Prob. 133PCh. 8 - Two pipes of identical diameter and material are...Ch. 8 - Prob. 135PCh. 8 - Shell-and-tube heat exchangers with hundred of...Ch. 8 - Water at 15 C is to be dischaged froiti a...Ch. 8 - Consider flow front a reservoir through a...Ch. 8 - A pipelme ihat Eransports oil ai 4OC at a iate of...Ch. 8 - Repeat Prob. 8-140 for hot-water flow of a...Ch. 8 - Prob. 142PCh. 8 - Prob. 145EPCh. 8 - Prob. 146EPCh. 8 - In a hydroelectric power plant. water at 20°C is...Ch. 8 - Prob. 148PCh. 8 - Prob. 152PCh. 8 - The water at 20 C in a l0-m-diameter, 2-m-high...Ch. 8 - Prob. 155PCh. 8 - Find the total volume flow rate leaving a tank...Ch. 8 - Prob. 158PCh. 8 - Water is siphoned from a reservoir open to the...Ch. 8 - It is a well-known fact that Roman aqueduct...Ch. 8 - In a piping system, what is used to control the...Ch. 8 - Prob. 163PCh. 8 - Prob. 164PCh. 8 - Prob. 165PCh. 8 - Consider laminar flow of water in a...Ch. 8 - Water at 10 C flows in a 1.2-cm-diameter pipe at a...Ch. 8 - Engine oil at 20 C flows in a 15-cm-diamcter pipe...Ch. 8 - Prob. 169PCh. 8 - Watet flows in a I 5-cm-diameter pipe a, a...Ch. 8 - The pressure drop for a given flow is determined...Ch. 8 - Prob. 172PCh. 8 - Air at 1 atm and 25 C flows in a 4-cm-diameter...Ch. 8 - Hot combustion 8ases approximated as air at I atm...Ch. 8 - Air at 1 aim and 40 C flows in a 8-cm-diameter...Ch. 8 - The valve in a piping system cause a 3.1 in head...Ch. 8 - A water flow system involves a 180 return bend...Ch. 8 - Air flows in an 8-cm-diameter, 33-m-long pipe at a...Ch. 8 - Consider a pipe that branches out into two...Ch. 8 - Prob. 182PCh. 8 - Prob. 183PCh. 8 - Prob. 184PCh. 8 - Prob. 185PCh. 8 - Prob. 186PCh. 8 - Design an experiment to measure the viscosity of...Ch. 8 - During a camping trip you notice that water is...
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
- In a geothermal district heating system, 10,000 kg/sof hot water must be delivered a distance of 10 km in ahorizontal pipe. The minor losses are negligible, and the onlysignificant energy loss arises from pipe friction. The frictionfactor is taken to be 0.015. Specifying a larger-diameter pipewould reduce water velocity, velocity head, pipe friction, andthus power consumption. But a larger pipe would also costmore money initially to purchase and install. Otherwise stated,there is an optimum pipe diameter that will minimize the sumof pipe cost and future electric power cost.Assume the system will run 24 h/day, every day, for 30 years.During this time the cost of electricity remains constant at$0.06/kWh. Assume system performance stays constant overthe decades (this may not be true, especially if highly mineralizedwater is passed through the pipeline—scale may form).The pump has an overall efficiency of 80 percent. The cost topurchase, install, and insulate a 10-km pipe depends on…arrow_forwardan air is following at Q=18000CFM in a duct by the means of a centrifugal fan of efficiency 0.82. if the shaft power 21.25 hp required to run the fan at these conditions and the total friction resistance of the duct 1.5 in of water. what is the air velocity in the ductarrow_forwardA small-scale Compressed Air Energy Storage (CAES) system uses a rigid tank, whichhas been sized to 1m3. The air storage helps support various fluid power (pneumatics)requirements, but also serves for energy storage (when fully charged).The tank sits in a plant room having a temperature of 25oC at 1 atmosphere (101.325kPa).When delivered new and installed the tank (and the ambient air it contains) is assumedinitially at the same steady state conditions in the plant room. The tank can be filled with(dry) air to a maximum pressure of 300bar. When left in the plant room, the pressurised airtank eventually attains the plant room temperature.You may assume:> Steady state conditions apply> Negligible changes in kinetic and potential energy> Thermal mass of the tank (metal) is negligible Apply the ideal gas equation and calculate the mass of 25oC air (units: kg) in the fullypressurised tank.arrow_forward
- A water source with an elevation of 12 m is to be pumped by a centrifugal pump to an open reservoir at an elevation of 100 m. The suction pipe and discharge pipe diameter is 250mm and 200 mm, respectively. The pump centreline is at 5m. The head loss at suction pipe is 0.05m and 0.45 at the discharge pipe. The pump delivers water at 15 L/s and has an efficiency of 75% while the electric motor is 80%. Determine: a. Water horsepower of the pump b. Brake horsepower of the pump c. Power input to drive the motor, in kW d. The pressure gage readings installed before and after the suction and discharge of the pump, kPa.arrow_forwardIf the Darcy Weisbach friction factor for a fluid flow through a pipeline is calculated as 0.016, the Fanning friction factor can be calculated as O 0.004 O 0.000256 None of the above O 0.064arrow_forwardAn isosceles triangle channel having an apex angle of 60 ° and length of 20 m is being heated uniformly with electric heaters. Water flows through this channel with an inlet temperature of 15 °C and mass flow rate of 1 kg/s and is 10 m being heated to 45 °C at the exit of the tube. Assuming the water flow is fully developed through the channel what is the average convection heat transfer coefficient? Also determine the pumping power. 10 m 16 marrow_forward
- In the diesel oil transfer facility (ρ rel = 0.85), from the storage tank to the consumption tank, we want to install a pump to circulate a flow of 45 lt / s. The 400m long pipe is cast 150mm in diameter and consists of a check valve, a gate valve and 2 commercial medium radius elbows. The consumption tank is pressurized to 3.8 bar of manometric pressure. Determine the drive power of the pump in kW if its performance is 68%. Additional data, load loss factors: 1. Check valve Kr = 1.5 2. Gate valve open Kv = 0.21 3. Commercial elbow of mean radius Kc = 0.75, for each elbow 4. Storage tank outlet sharp angles Ks = 0.5 5. Entrance to consumption tank Ke = 1 6. Pipe friction factor f = 0.025arrow_forwardFor a piping system, define the system curve, the characteristic curve, and the operating point on a head versus flow rate chart.arrow_forwardWater with a specific heat of 1 BTU/lbm F is pumped using a 1-hp jet pump from a well that is 20 ft deep into a vented water vessel 160 ft above the ground. In the process, 900 BTU/min of heat is lost from the system. What is the temperature (F) of the water as it enters the vessel if the flow rate of the water is 5 gal/min? Assume the temperature of water in the well is (35 F).arrow_forward
- 4. An experimental test rig is used to examine two-phase flow regimes in horizontal pipelines. A particular experiment involved uses air and water at a temperature of 25°C, which flow through a horizontal glass tube with an internal diameter of 25.4 mm and a length of 40 m. Water is admitted at a controlled rate of 0.026 kgs-¹ at one end and air at a rate of 5 x 104 kgs¹ in the same direction. The density of water is 1000 kgm3, and the density of air is 1.2 kgm-³. Determine the mass flow rate, the mean density, gas void fraction, and the superficial velocities of the air and water. Answer: 0.02605 kgs-1, 61.1 kgm ³, 0.94, 0.822 ms-1, 0.051 ms-1arrow_forwardTo cool a given room it is necessary to supply 4 ft³/s of air through a 5-in.-diameter pipe. Approximately how long is the entrance length in this pipe? Assume that air is at 60°F. le i ! ftarrow_forwardWater with a specific heat of 1 BTU/lbmoF is pumped using a 1-hp jet pump from a well that is 20 ft deep into a vented water vessel 160 ft above the ground. In the process, 400 BTU/min of heat is lost from the system. What is the temperature (oF) of the water as it enters the vessel if the flow rate of the water is 5 gal/min? Assume the temperature of water in the well is (35oF).arrow_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
Heat Transfer – Conduction, Convection and Radiation; Author: NG Science;https://www.youtube.com/watch?v=Me60Ti0E_rY;License: Standard youtube license