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Species A is evaporating from a flat surface into species
B. Assume that the concentration profile for species A in the concentration boundary layer is of the form CA( y) = Dy2 + Ey + F, where D, E, and F are con- stants at any x-location and y is measured along a nor- mal from the surface. Develop an expression for the mass transfer convection coefficient hm in terms of these constants, the concentration of A in the free stream CA,oo and the mass diffusivity DAB. Write an expression for the molar flux of mass transfer by con- vection for species A.
Determine the force required to open the valve - What length of cable CD is required for static equilibrium in the position shown? What is the tension T in cable CD?
A throttling valve is used in an air conditioning system to reduce the pressure of refrigerant: R134a as it flows from a condenser to an evaporator. The refrigerant enters the throttling valve at a pressure of 140psia and a temperature of 95F and lea..
An experimentalist measures a head loss of 331mm in a 2530 mm length of 35mm pipe. the average velocity is 1.760 m/s. calculate the friction factor. if the fluid is water at 50c, calculate the equivalent sand grain roughness of the pipe. Knowing that..
A 90-kg man and 60-kg woman stand side by side at the same end of of 150-kg boat ready to dive, each with a 5-m/s velocity of the boat after they have both dived, if (a) the women dives first, (b) the man dives first.
Calculate the change in internal energy of the gas. Remember it is an ideal gas in a constant temperature bath.
provide credible information of any job in machanical engineering. About the job that you would like to get within a few years of graduating.
a a disk has a radius of 2 cm and weighs 12 kg. what is the required constant moment to rotate the disk from rest to a
a turbine is supplied with 0.6m3s of water from a 0.3m diameter pipe the discharge pipe has a diameter of 0.4m. the
consider an air-standard otto cycle and a modified cycle in which the isentropic compression and expansion processes
A rigid tank has a volume of 23.3 m^3 and due to safety requirements its pressure should not exceed 105 bar. If the tank has been filled with 1000kg of water vapor and is heated to 360°C check to see if it is within safety requirements.
Describe the principle and operation of an hearth furnace. Possible references: Making and Shaping of Steels by the American Society of Metals and Google resources.
Two resistors, R 1 = 100.0 ± 0.2 ? and R2 = 50.0 ± 0.1 ?, are connected (a) in series and (b) in parallel. Calculate the uncertainty in the resistance of the resultant circuits. What is the maximum possible error in each case?
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