Consider the mixing of ethyl acetate and sodium hydroxide in a confined jet tubular reactor as shown in the following figure. In this

system, ethyl acetate is fed through the confined jet tube while sodium hydroxide is fed through the annular region. The confined jet creates a wake into which fluid from the jet and annular region enter, causing mixing to occur.

(a) Set up a confined jet geometry in COMSOL as shown in the following figure and define fully developed laminar flow profiles at the entrances to the tube and annulus. Use COMSOL to solve for the flow profiles (including axial velocity and streamlines) throughout the jet-mixing device (including the jet tube and the annular region) and to plot streamlines. Assume a 1-mm jet-tube wall thickness.

(b) Include the mass balances for species transport. Use COMSOL to find the concentration profiles and conversion.

(c) For parts (a) and (b), what is the effect of reducing the radius of the jet tube? Consider \(r=0.3 \mathrm{~cm}\).

Transcribed Image Text:

V = 1 L/min Ci,Eiac = 0.1 mol:L ELAC V = 1 L/min Co. NaOH =0.1 mol/L L'-10 cm =1cm z L-1573 cm T R-2 cm