I need to find the most efficient way to each 600 ml of water without using an electric heat source or any non human power. I thought i would use a combination of agitation and cavitation, with a screw with lots of "dimples" that create the pockets of low resistance that would create cavitation inside a tube. I can't find any information on cavitation other than what it is on a basic level so i have a few questions. 1) is this even worth it? is the heat caused by cavitation going to be significant enough in such a short time? 2) if it is, how can i maximize it? Should i use a narrower tube with a longer screw to spread the water out? or should i have a thicker tube so i can maximize the surface area of the screw blades, maximizing cavitation? though i'm in high school, i've studied into multivariable calculus so if you have any equations whatsoever, please share them no matter how mathematically complex. any help would be greatly appreciated.