FUND OF ENG THERMODYN(LLF)+WILEYPLUS
9th Edition
ISBN: 9781119391777
Author: MORAN
Publisher: WILEY
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8.. An air blower is to deliver 40,000 ft3
/min. Two U-tube gages measure suction and discharge
pressures. The suction gage reads a negative 2′′ of water. The discharge gage, located 3 ft above the
point to which the suction gage is attached, reads +3′′ of water. The discharge and suction ducts are of
equal diameter. What size motor should be used to drive the blower if the overall efficiency is 68% (γ =
0.0750 lb/ft3
for air)? indicate free body diagram
5.14 The air flow to a four cylinder, four-stroke oil engine is measured by
means of a 5 cm diameter orifice having a coefficient of discharge of 0.6.
During a test on the engine the following data were recorded : bore =
10 cm; stroke = 12 cm; speed = 1200 rpm; brake torque = 120 Nm;
fuel consumption = 5 kg/h; calorific value of fuel = 42 MJ/kg; pressure
drop across orifice is 4.6 cm of water; ambient temperature and pressure
are 17 °C and 1 bar respectively. Calculate (i) the thermal efficiency on
brake power basis; (ii) the brake mean effective pressure and (iii) the
volumetric efficiency based on free air condition.
%3D
3. A pump steadily circulates oil used for lubricating heavy machine tools. The volume flow rate and temperature
of the oil are 300 gal/min and 104°F, respectively. At 104°F, the kinematic viscosity and the specific gravity
of the oil are 2.15 x 10-3 ft² /s and 0.89, respectively. The pipe lengths are 25 ft for the 4-in diameter pipe and
75 ft for the 3-in diameter one. The Schedule-40 steel pipe has an average roughness element size of 0.0018 in.
If all minor losses can be ignored, evaluate how much power (in a unit of horsepower) the pump delivers to
the oil.
6 ft
22 ft
Flow
15 ft
Discharge line
3-in Schedule 40
Suction line
4-in Schedule 40
steel pipe
steel pipe
Pump
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