Engineering, 05.05.2020 05:32 seasmarie75

The moisture in hot, humid, stagnant air surrounding a cold water pipeline continually diffuses to the cold surface where it condenses. The condensed water forms a liquid film around the pipe, and then continuously drips off the pipe to the ground below. At a distance of 10 cm from the surface of the pipe, the moisture content of the air is constant. Close to the pipe, the moisture content approaches the vapor pressure of water evaluated at the temperature of the pipe.

a) Draw a picture of the physical system and state at least five reasonable assumptions for the mass transfer aspects of the process.

b) What coordinate system should be used? b) What is the simplified differential form of Fick's equation for water vapor (spech

c) What is the simplified form of the general differential equation for mass transfer in terms of flux NA? What term is constant over the diffusion path?

d) What is the general differential equation for mass transfer in terms of concentr Propose two boundary conditions that may be used to solve the resulting differential equation.

Answers: 1

Show answers

Another question on Engineering

Engineering, 04.07.2019 18:20

Agas mixture consists of 8 kmol of h2 and 2 kmol of n2. determine the mass of each gas and the apparent gas constant of the mixture.

Answers: 3

Answer

Engineering, 04.07.2019 19:10

Afoot bridge is made as a simple deck, 4 m long, with a cross section 2 m (wide) and 20 cm thick, and made of wood. the deck is supported at the two ends. the maximum load allowable on the bridge is 10 tons, provided it is uniformly distributed on the deck. to sense this load, a strain gauge is placed at the center of the bridge and its resistance is monitored. if the sensor has a nominal resistance of 350 s2 and a gauge factor of 3.6, what is the reading of the strain gauge at maximum load? the modulus of elasticity for the wood used in the construction is 10 gpa.

Answers: 2

Answer

Engineering, 06.07.2019 02:30

A12 mm diameter shaft runs in a plain cylindrical bush 30 mm long that is located in an 18 mm diameter hole in a housing. the shaft-inner bush fit is h8 f and the outer bush-housing fit is h7-p6. make a fully cimensioned sketch of the bush with tolerances. find the maximum and minimum clearance or interference for both fits on the inner and outer diameters of the bush

Answers: 3

Answer

Engineering, 06.07.2019 03:10

An electrical kettle is made out of stainless steel,weighs two pounds (when empty) with a heating element that consumes 2 kw of electricity. assuming that the water and the kettle are at the same uniform temperature at any moment of time, calculate the shortest possible time to bring 2 quarts of water from room temperature to the onset of boiling.

Answers: 1

Answer

You know the right answer?

The moisture in hot, humid, stagnant air surrounding a cold water pipeline continually diffuses to t...

Questions