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1. Cranberries are harvested by flooding the bogs in which they are grown and raking them into troughs for transport. At the processing plant, the surface moisture on the berries is removed as they roll over a fine screen through which warm air is blown. The berries have an average diameter of 15 mm, and the thickness of the water layer is 0.2 mm.
2. A spherical drop of water, 0.5 mm in diameter, is falling at a velocity of 2.15 m/s through dry, still air at 1-atm pressure. Estimate the instantaneous rate of evaporation from the drop if the drop surface is at 60°C and the air is at 100°C.
3. A spherical droplet of alcohol, 0.5 mm in diameter, is falling freely through quiescent air at a velocity of 1.8 m/s. The concentration of alcohol vapor at the surface of the droplet is 0.0573 kg/m3, and the diffusion coefficient for alcohol in air is 10-5 m2/s. Neglecting radiation and assuming steady-state conditions, calculate the surface temperature of the droplet if the ambient air temperature is 300 K. The latent heat of vaporization is 8.42 X 105 J/kg.
an otto cycle is proposed to have a compression ratio of 101 while operating with the low air temperature of 277 degree
Consider a carbon-reinforced epoxy composite containing 45 vol% unidirection- ally aligned carbon ?bers.
now it is proposed that the liquid water coming out of the separator be used as the heat source in a binary cycle with
a 10 cm2 plate has an electric heater installed that produces a constant heat flux. saturated liquid water at 10 degc
1kg of fluid is compressed reversibly according to a law pv0.25 where p is in bar and v is in m3kg. the final volume is
a company is interested in hiring you to build something for their use. they want to make a cyclotron that will
the net contents in ounces of canned soup is a random varialbe with probability distribution fx 4x-11.75 11.75 lt x lt
an ice-making plant working on a reversed carnot cycle heat pump removes 3.5kw heat from the ice which is maintained at
The power P required to drive a fan is believed to depend on density p, flow rate Q, impeller dia. D, and angular veloctiy w in Hz. Determine by dimensional analysis, the general expression for dependence of P on other variables.
A feed that is 50 mol% methane, 10 mol% n-butane, 15 mol% n-pentane, and 25 mol% n-hexane is flash distilled. F=150 kmol/h. Drum pressure =250 kPa, drum temperature =10 degrees celcius. use the depriester charts. find V/F, xi, yi, V, L.
Two different fuels are being considered for a 1 MW (net output) heat engine which can operate between the highest temperature produced during the burning of the fuels and an atmospheric temperature of 300 K. Fuel A burns at 2,500 K, delivering 50 MJ..
A heat engine operating on the Carnot cycle has an efficiency of 65%. The waste heat from the cycle is rejected to the atmosphere at 20 deg. C. at a rate of 250 kW. What is the temperature of the heat source driving the engine in deg. C? What is the ..
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