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For spherical sand particles with Dp = 0.045 inches and the density of each particle is 145 lbm/ft3, estimate the minimum fluidizing velocity for air and for water. Assume a porosity of 32 percent. You may need to rederive Equation 11.41 considering the non-negligible density of the fluid - in the case of water. Assume a temperature 68 °F.
h2o as saturated liquidvapor mixture enters a counterflow heat exchanger operating at steady state at 0.7 bar with a
A vertical piston-cylinder device, which is insulated, initially contains 15 kg of water, 9 kg of which is in the vapor phase. The pressure inside the cylinder is maintained constant at 0.3 MPa by mass of the piston. Now steam at 0.8 MPa and 500 °C i..
a 20 cm diameter sphere is made of a heat-generating material that produces 106 wm3. the sphere is cooled by 20oc air
apply risk management techniques all steps learned in the class to analyze the failure and what could have been done to
gear a accelerates clockwise from rest to 100 rpm in 2 seconds. determine the angular acceleration of gear b and the
a 10-lb block b rests as shown on a 20-lb bracket a. the coefficients of friction are us0.3 and uk0.25 between block b
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.
experiment can be used to investigate heat transfer associated with flow past cylindrical tubes either in isolation or
a cold-drawn steel shaft of 155 bhn is 12 in. long 1.25 in. in diameter and has a 0.25-in.-diameter transverse hole.
Air enters a nozzle steadily at 2.21 kg/m^3 and 30 m/s and leaves at 0.762 kg/m^3 and 180 m/s. If the inlet area of the nozzle is 80 cm^2 determine a) The mass flow rate through the nozzle and b) The exit area of the nozzle.
steam enters a nozzle at 30 bars and 320c and leaves at 15 bars with a velocity of 535 ms. the mass flow rate is 8000
consider the brass alloy the stress-strain behavior of which is shown in the animated figure 6.12. a cylindrical
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