Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
1. (See Fluids in the News Article titled "Hi-tech Ceiling Fans," Section 12.7.) Explain why reversing the direction of rotation of a ceiling fan results in airflow in the opposite direction.
2. For the fan of both Examples 5.19 and 5.28 discuss what fluid flow properties you would need to measure to estimate fan efficiency.
Example 5.19
Moment-of-Momentum-Power
GIVEN An air fan has a bladed rotor of 12-in. outside diameter and 10-in. inside diameter as illustrated in Fig. E5.19a. The height of each rotor blade is constant at 1 in. from blade inlet to outlet. The flowrate is steady, on a timeaverage basis, at 230 ft3 /min and the absolute velocity of the air at blade inlet, V1, is radial. The blade discharge angle is 30° from the tangential direction. The rotor rotates at a constant speed of 1725 rpm.FIND Estimate the power required to run the fan.
Examples 5.28
Energy-Fan Performance
GIVEN Consider the fan of Example 5.19
FIND Show that only some of the shaft power into the air is converted into useful effects. Develop a meaningful efficiency equation and a practical means for estimating lost shaft energy
Due to global climate change scientist predict the earth’s atmospheric temperature will increase as much as 8°F in the next 100 years. Estimate the overall energy increase [kJ] in the atmosphere this temperature rise will cause. Consider the thicknes..
Steam is expanded from 20 bars, 280 C to 100kPa through an adiabatic, steady flow turbine whose isentropic efficiency is 90%. The turbine surroundings maintain their temperature at 27 C. How much entropy is generated by this process and does this pro..
1. (a) Contrast the manner in which stress relaxation and viscoelastic creep tests are conducted. (b) For each of these tests, cite the experimental parameter of interest and how it is determined.
helium gas is heated in a constant volume process from -200 to 500degf. obtain specific heat values for helium and
How can aeration improve drinking water quality?What Methods are available to aerate water?
helium is throttled from 1.2 mpa 20degc to a pressure of 100 kpa. the diameter of the exit pipe is so much larger than
A metal block of mass 0.5kg is immersed in oil of density 850kg/m3, calculate the volume of oil that overflowed if the specific gravity of the block is 1.22.
The yield strength for an alloy that has an average grain diameter of 4.4 x 10-2 mm is 115 MPa. At a grain diameter of 7.1 x 10-3 mm, the yield strength increases to 258 MPa. At what grain diameter, in mm, will the yield strength be 237 MPa?
A relief valve is installed on the bottom of a pressure vessel. The entrance to the valve is 4.5 inches diameter, and the exit (which discharges in the horizontal direction, 90 degrees from the entrance) is 5 inches in diameter. The loss coefficient ..
A rigid tank contains 5.56 kg of an ideal gas at 3.6 ATM and 40 degrees Celsius. Now a valve is opened and half of the mass of the gas is allowed to escape. If the final pressure in the tank is 2.0 ATM, the final temperature of the tank is?
Room temperature atmospheric air is accelerated by a nozzle steadily from a low velocity to a velocity of 220 m/s. If the nozzle diameter decreases by a factor of 2:
A wheelof radius 10 cm can rotate freely about its center as shown in figure. A string is wrapped over its rim and is pulled by a force of 5.0 N. It is found that the torque produces an angular acceleration 2.0 rad/s2 in the wheel. Calculate the m..
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd