A spray-drying operation similar to that described in Problem 5.23 is used by the pharmaceutical industry. Acetaminophen is an active pharmaceutical ingredient (API) that can be produced in powdered form by spray drying. A mixture of the API containing 75 wt% water is fed to an atomizer in a dryer where it is brought into contact with hot air that enters the dryer at 220°C and 6.0 bar. All of the water is evaporated. The outlet gas contains 0.81 mole% water and leaves the dryer chamber at 80°C and 1.0 atm absolute with a flow rate of 513.6 m 3 / h 513.6m3/h. Calculate the production rate of powdered API and the volumetric flow rate of inlet air.

Tom is having a problem with his washing machine. he notices that the machine vibrates violently at a frequency of 1500 rpm due to an unknown rotating unbalance. the machine is mounted on 4 springs each having a stiffness of 10 kn/m. tom wishes to add an undamped vibration absorber attached by a spring under the machine the machine working frequency ranges between 800 rpm to 2000 rpm and its total mass while loaded is assumed to be 80 kg. a) what should be the mass of the absorber added to the machine so that the natural frequency falls outside the working range? b) after a first trial of an absorber using a mass of 35 kg, the amplitude of the oscillation was found to be 10 cm. what is the value of the rotating unbalance? c) using me-3.5 kg. m, find the optimal absorber (by minimizing its mass). what would be the amplitude of the oscillation of the absorber?