Hello, I know the use of baffles in a shell and tube heat exchanger will guide the shell-side fluid as it navigates through the shell, but I saw baffles are also used in CSTRs to help with mixing. This is clearly illustrated with the diagram where one can see that the baffle is directing the shell fluid up and down, increasing the time it spends inside the exchanger, thus absorbs more heat from the tube side fluid, hence heat exchange. Very useful indeed. According to wikipedia, the use of a baffle in a tank reactor is However, with the diagram here of a stirred reactor, I don't see how having some blocks on the side actually do anything? Is it not the agitator that is doing the mixing? What good is the baffle for?