Engineering, 04.04.2020 01:00 aliyahaliyah54
A solar pond operates on the principle that heat losses from a shallow layer of water, which acts as a solar absorber, may be minimized by establishing a stable vertical salinity gradient in the water. In practice such condition may be achieved by applying a layer of pure salt to the bottom and adding an overlying layer of pure water. As a first approximation, the total mass density and the diffusion coefficient for salt in water (Dab) may be assumed to be constant, with Dab = 1.2e-9 m2/s. A saturated density = 380 kg/m3 is maintained for salt in solution at the bottom of the water layer of thickness L = 0.5 m. If the bottom is depleted of salt at the time that the salt density reaches 68% of saturation at the top, (a) determine the final (steady-state) density of the salt at the bottom. (b) Determine the time that the salt density reaches 68% of saturation at the top.
Answers: 3
Engineering, 04.07.2019 18:20
Asolid cylinder is concentric with a straight pipe. the cylinder is 0.5 m long and has an outside diameter of 8 cm. the pipe has an inside diameter of 8.5 cm. the annulus between the cylinder ad the pipe contains stationary oil. the oil has a specific gravity of 0.92 and a kinematic viscosity of 5.57 x 10-4 m2/s. most nearly, what is the force needed to move the cylinder along the pipe at a constant velocity of 1 m/s?
Answers: 3
Engineering, 04.07.2019 18:20
Aquick transition of the operating speed of a shaft from its critical speed will whirl amplitude. (a) increase (b) limit (c) not affect (d) zero
Answers: 2
Engineering, 04.07.2019 18:20
Athin walled concentric tube exchanger is used to cool engine oil from 160°c to 60°c with water that is available at 25°c acting as a coolant. the oil and water flow rates are each at 2 kg/s, and the diameter of the inner tube is 0.5 m and the corresponding value of the overall heat transfer coefficient is 250 w/m2. oc. how long must the heat exchanger be to accomplish the desired cooling? cpwater=4.187 kj/kg-candcpengine el=2.035 kj/kg·°c, oil . 120]
Answers: 1
Engineering, 04.07.2019 19:10
Apressure vessel with an r/t 20 cannot be treated as thin walled vessel. a)-trune b)- false
Answers: 3
A solar pond operates on the principle that heat losses from a shallow layer of water, which acts as...
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