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Under laminar conditions, the volume flow Q through a small triangular-section pore of side length b and length L is a function of viscosity , pressure drop per unit length ?p/L, and b. Using the pi theorem, rewrite this relation in dimensionless form. How does the volume flow change if the pore size b is doubled?
a heat pump is to be used to heat a building during the winter. the building is to be maintained at 22.9oc at all
a building wall is made of 200 mm of poured concrete on the outside 100 mm of fiberglass insulation in the middle and
air at a velocity of 3 ms and 20 degrees c flows over a flat plate along its length. the plate is 100cm long 50 cm wide
A battery of silicon photocells mounted on a plane surface operates with an efficiency of 16.7% under all conditions encountered in this problem. it is installed at a location 45 degrees north. the time is 10:00 on April 1, 1995. When the battery fac..
An air nozzle has an exit area 1.6 times the throat area. If a normal shock occurs at a plane where the area is 1.2 times the throat area, find the pressure, temperature, and Mach number at the exit. The stagnation temperature and pressure before the..
We need to design a piping system that transports 35ft^3/s of water 100ft. The available head is 7ft. The pipe is to be made out of a rough concrete material. Find the necessary diameter for the pipe.
Electromagnetic waves (which transfer electromagnetic energy) do not need any medium to propagate. EM waves travel forward due to vibrations of the electric field and magnetic field vectors. Example : Light waves are EM waves.
Consider a short cylinder whose top and bottom surfaces are insulated. The cylinder was initially at a uniform temperature of Ti. At time t=0, the cylinder is suddenly subjected to a convection from its side surface to a surrounding fluid at temperat..
Daily sales records for a computer manufacturing firm show that it will sell 0,1, or 2 mainframe computer systems with probabilities as listed. Find the probability mass function for X, the number of sales in a two-day period, assuming that sales are..
A 2.64 kg copper part, initially at 400 K, is plunged into a tank containing 4 kg of liquid water, initially at 300 K. The copper part and water can be modeled as incompressible with specific heats of 0.385 kJ/kg. K and 4.2 kJ/kg.K, respectively. For..
A new fire resistant insulation is to be tested. A specimen of the insulation is placed in front of a test furnace. The specimen is 140 mm thick, and is initially at 25°C. The furnace gases are at 900°C, and the convective heat transfer coefficient o..
solve the following problem by showing all work answers in parenthesis steam enters a diffuser at 20 paia and 240degf
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