The irreversible elementary gas phase reaction 2a --> b + c is currently carried out in a packed bed reactor (pbr) containing 100 kg of catalyst. the entering pressure is 20 atm and the exit pressure is 4 atm. under steady state operating conditions, 50% conversion is achieved. it is proposed to add a cstr with 200 kg of catalyst downstream of the pbr. there is no pressure drop in the cstr. the flow rate and temperature remain unchanged. (a) what would be the overall conversion in such an arrangement? (b) is there a better way to carry out the reaction (i. e., increase conversion), and if so what is it?

Hydraulic fluid with a sg. of 0.78 is flowing through a 1.5 in. i.d. pipe at 58 gal/min. the fluid has an absolute viscosity of 11.8 x 105 lbf-sec/ft2. is the flow laminar, turbulent or within the critical range? give both a numerical reynolds number and a term answer.

An external consultant recommends that a plant installs a bank of capacitors for power factor correction. this will reduce the peak electrical demand charges by an average of 93 kw every month. the plant current pays $13 per kw in peak demand charges. the capacitor bank will include 223 kw of fixed capacitors, and 183 of variable capacitors. the fixed capacitors cost $59 per kw, and the variable capacitors will cost $65 per kw. the consultant charges 21% of the equipment costs to install the capacitors. because this project will reduce the demand for the electric utility, they are prepared to provide a one-time rebate of $42 per kw of reduced demand. what is the simple payback period for this project (in years)?

Acircular aluminum shaft mounted in a journal is shown. the symmetric clearance gap between the shaft and journal is filled with sae 10w-30 oil at t 30°c. the shaft is caused to turn by the attached mass and cord. develop and solve a differential equation for the angular speed of the shaft as a function of time.