Water flows (from bottom to top) in a vertical duct of 5 cm of internal diameter. A differential U-tube manometer, containing mercury (ρ = 13600 kg/m3) as the manometric fluid, is connected to the pipe at points 80 cm apart. The manometer reading indicates Δh = 45 cm. The water temperatures measured before and after the Δh measurement were 18°C and 22°C. Calculate the friction loss (lwf) between the measuring points in m2/s2

Water flows (from bottom to top) in a vertical duct of 5 cm of internal diameter. A differential U-tube manometer, containing mercury (ρ = 13600 kg/m3) as the manometric fluid, is connected to the pipe at points 80 cm apart. The manometer reading indicates Δh = 45 cm. The water temperatures measured before and after the Δh measurement were 18°C and 22°C. Calculate the friction loss (lwf) between the measuring points in m2/s2

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter8: Natural Convection

Section: Chapter Questions

Problem 8.28P

See similar textbooks

Similar questions

A 6-cm-diameter horizontal water pipe expands gradually to a 9-cm-diameter pipe. The walls of the expansion section are angled 10° from the axis. The average velocity and pressure of water before the expansion section are 7 m/s and 150 kPa, respectively. Determine the head loss in the expansion section and the pressure in the larger-diameter pipe.
Air is flowing at an average speed of 100 m/s through a 10-cm-diameter pipe. If the pipe undergoes an enlargement to 20 cm in diameter, determine the average speed in the enlarged pipe.
Water at 75 degrees Celsius is flowing horizontally at a rate of 1.6 m^3/min in a pipe. It enters a 3-in 45 degree elbow and is diverted upwards into a connecting pipe. The diameter of the outlet is 2in. If the pressure just before the elbow is 78 kPa, determine the magnitude and direction of the force necessary to keep the elbow in place. Assume frictional losses in the elbow are negligible.
The air velocity in the duct of a heating system is to be measured by a Pitot-static probe inserted into the duct parallel to the flow. If the differential height between the water columns connected to the two outlets of the probe is 3.2 cm, determine (a) the flow velocity and (b) the pressure rise at the tip of the probe. The air temperature and pressure in the duct are 45° C and 98 kPa, respectively
Water from a reservoir is raised in a vertical tube of internal diameter D = 30 cm under the influence of the pulling force F of a piston. Determine the force needed to raise the water to a height of h = 1.5 m above the free surface. What would your response be for h = 3 m? Also, taking the atmospheric pressure to be 96 kPa, plot the absolute water pressure at the piston face as h varies from 0 to 3 m.
Two water reservoirs A and B are connected to each other through a 40-m-long, 2-cm-diameter cast iron pipe with a sharp-edged entrance. The pipe also involves a swing check valve and a fully open gate valve. The water level in both reservoirs is the same, but reservoir A is pressurized by compressed air while reservoir B is open to the atmosphere at 95 kPa. If the initial flow rate through the pipe is 1.5 L/s, determine the absolute air pressure on top of reservoir A. Take the water temperature to be 10°C.
A fluid flows at 455 cubic meters per minute inside a rectangular duct, whose cross-section has a length of 150 cm and width of 85 cm. Determine the average velocity of the flow in m/s.
A reciprocating air compressor serves an air operated sinking pump operating at 760 kPag and 6.20 m3/min free air capacity at an altitude of 1000 m. Sea level conditions are at 101.3 kPaa and 30 deg C. Pressure correction factor = 1 cm Hg at 1000 ft; Temperature correction factor = 3.6 deg C at 1000 ft. Determine the barometric pressure in kPaa at the given altitude.
A hydroelectric power plant uses Pelton-type turbines, in which multiple nozzles are used to accelerate the waterwhich is directed onto the turbine blades, which are exposed to an atmospheric pressure of 101.325 kPa. The water enters the nozzles with an absolute pressure of 500 kPa and a speed of 5 m/s, and the nozzle outlets are exposed to atmospheric pressure and have an internal diameter of 5 cm. Consider that the specific mass of water is 1,000 kg/m3. Determine the mass flow rate of water through each of the nozzles, and explain why the actual mass flow rate will be lower.
The water at 20°C in a 10-m-diameter, 2-m-high aboveground swimming pool is to be emptied by unplugging a 5-cm-diameter, 25-m-long horizontal plastic pipe attached to the bottom of the pool. Determine the initial rate of discharge of water through the pipe and the time (hours) it would take to empty the swimming pool completely assuming the entrance to the pipe is well-rounded with negligible loss. Take the friction factor of the pipe to be 0.022. Using the initial discharge velocity, check if this is a reasonable value for the friction factor.
Water is flowing through a venturi meter whose diameter is 7 cm at the entrance part and 4 cm at the throat. The pressure is measured to be at 380 kPa at the entrance and 150 kPa at the throat. Neglecting frictional effects, determine the flow rate of water in SI units.
What are extensive and intensive properties? What is an isolated system? What is a quasi-static process? What is a manometer? What are the two types of manometers? What is a thermocouple? What is zeroth law of thermodynamics? What is a dimension? A unit? What is mechanical equilibrium? chemical equilibrium? thermal equilibrium? Electrical equilibrium? What is thermodynamic equilibrium? What is the seebeck effect? What is the instrument used to measure emf? At what temperature does glass begins to soften?