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A hemispherical droplet of liquid water, lying on a flat surface, evaporates by molecular diffusion through still air surrounding the droplet. The droplet initially has a radius R. As the liquid water slowly evaporates, the droplet shrinks slowly with time, but the flux of the water vapor is at a nominal steady state. The temperature of the droplet and the surrounding still air are kept constant. The air contains water vapor at a infinitely long distance from the droplet's surface.
What is the simplified differential form of Fick's equation for water vapor (species A)?
read the titled books drilling fluid engineering manual. textbook prepared by m-i drilling fluids co.1998 halliburton
A large tower is to be supported by a series of steel wires; it is estimated that the load on each wire will be 13,300 N (3000 lbf). Determine the minimum required wire diameter, assuming a factor of safety of 2 and a yield strength of 860 MPa (12..
What kind of metals are often recommended for use at low temperatures, particularly when any sudden loading of the part is expected?
Consider horizontal pipe carrying water at 70 °F. It is given that the pressure drop over a 100-ft length of 1-in-diameter is 5.0 psig. Determine (a) the Reynolds number, (b) the friction factor, and (c) the flow rate of the water?
a concrete pipe with an inside and outside diameter of 60 cm and 70 cm respectively hangs from cables. the pipe is
you are asked to design a solid circular shaft of minimum cost that is 1.3 m long and has to twist less than 3 degrees
a differential thermocouple with sensors at the inlet and exit of a pump indicates that the temperature of water rises
10 kg of ammonia is at 0c contained in a cylinder at 516 kpa by a free moving piston. it is heated until it vaporizes
Calculate the vacancy concentration in aluminum at 50%, 70%, and 90% of TMP=923 K. Gvf = 0.66 eV, and k = 8.62 x 10-5 eV/K. Calculate ln (nv/N) and 1/T, and plot on a linear scale (hint: should be a straight line).
Calculating temperature, water evaporation, and heat in a power plant cooling situation. In a nuclear power plant the cooling tower system must be run on a closed cycle.
Consider a metal single crystal oriented such that the normal to the slip plane and the slip direction are at angles of 43.1
you are planning to build a new home with approximately 2000 -2500 gross square feet of living space on one floor. in
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