SAE No. 10 oil has a viscosity of 0.20 Pa-s. How long would it take to pour 4.0 L of oil through a funnel with a neck 15. cm long and 2.0 cm in diameter?
(Assume the surface of the oil is kept 6.0 cm above the top of the neck, and neglect any drag effects due to the upper part of the funnel.)
A) 105 s
B) 52 s
C) 1.5 minutes
D) 46 s
E) 84 s
B
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The 1-m-long, tube-within-a-tube heat exchanger, as shown in the sketch, is used to condense steam at 2 atmospheres in the annulus. Water flows in the inner tube, entering at 90°C. The inner tube is made of copper with a 1.27 cm OD and 1.0 cm ID. (a) Estimate the water flow rate required to keep its outlet temperature below 100°C. (b) Estimate the pressure drop and the pumping power for the water in the heat exchanger, neglecting inlet and outlet losses.
GIVEN
? Tube-within-a-tube condenser
? Cooling water flowing in the inner tube
? Steam at 2 atm condensing inside the annulus
FIND
(a) Coolant water flow rate to maintain coolant outlet temperature below 100°C
(b) Coolant pressure drop and pumping power
ASSUMPTIONS
? Steady conditions
? The heat exchanger is horizontal
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 13, the properties of water at 2 atm are
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Indicate whether the statement is true or false
A wave oscillates up and down twice in 1 s. If the wave travels an average distance of 6 m in 1 s, its wavelength is
A) 0.5 m. B) 1 m. C) 2 m. D) 3 m. E) 6 m.
The neutron is radioactive and can beta decay to form a proton. This can occur primarily because
a. the proton has less mass than a neutron. b. there are several hydrogen isotopes. c. of the binding energy of hydrogen. d. the neutron is neutral.