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The total solidification times of three casting shapes are to be compared: (1) a sphere with diameter = 10 cm, (2) a cylinder with diameter and length both = 10 cm, and (3) a cube with each side = 10cm. The same casting alloy is used in the three cases. (a) Determine the relative solidification times for each geometry. (b) Based on the results of part (a), which geometric element would make the best riser? The mold constant = 3.5 min/cm2 in Chvorinov's rule.
consider a thin walled cylindrical tank having a diameter of 2 ft and a height of 5 ft. the tank is initially filled to
Describe IN DETAIL how you could determine the required rate of heat addition or removal.
What happens to the cutting and thrust force as tool rake angle and cutting speed are increased and what is the relation between the cutting and thrust forces to the depth of cut?
assume air flows isentropically through a converging-diverging nozzle. at station 1 which is aft of the throat and has
ammonia enters a heat exchanger operating atsteady state as a superheated vapor at 14 bar 60degc where itis cooled and
a small mechanical part in a complicated machine moves such that its position relative to a fixed frame of reference is
approximate a boeing 777 aircraft as a system with a fixed mass of 200000 kg. the plane initially cruises at 270 ms at
consider a steam power plant that operates on the ideal reheat rankine cycle. the plant maintains the boiler at 7000
calculate the quality of the system to begin with. calculate the amount of liquid water to begin with. calculate the heat transfer during the heating process.
air enters an insulated diffuser operating with steady flow and at steady state with a pressure of 0.7 bar a
air is compressed under steady flow conditions see figure q3. the power input to the compressor is 3 kw. during the
The diameter of the tube is 13 cm and its length is 60 m. Determine the overall heat transfer coefficient of this heat exchanger using (a) LMTD and (b) -NTU method.
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