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Before being injected into a furnace, pulverized coal is preheated by passing it through a cylindrical tube whose surface is maintained at Tsur = 1000 C. The coal pellets are suspended in an air flow and are known to move with a speed of 3 m/s. If the pellets may be approximated as spheres of 1-mm diameter and it may be assumed that they are heated by radiation transfer from the tube surface, how long must the tube be to heat coal entering at 25 C to a temperature of 600 C? Is the use of the lumped capacitance method justified?
one kg of water vapor at 200 kpa fills the 1.1989 m3 left chamber of a partitioned system. the right chamber has twice
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Find the desired radius and mass of the absorber if the absorber is to not exceed an angular deflection amplitude of 30 degrees when the engine is running at 750 rpm.
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water at the rate of 60 kghour is heated from 35oc to 70oc by an oil with specific heat of 1.9kjkgk. the fluids are
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