Feedback fluidic flowmeters with curved attachment walls

Feedback fluidic flowmeters with curved attachment walls instead of conventional straight attachment walls were designed and machined. We experimentally investigated the effects of the dimensions of the jet nozzle and feedback channel on the oscillatory frequency, using water as the working fluid. The results reveal that in most cases, feedback fluidic flowmeters with curved attachment walls have a greater oscillatory frequency than those with straight attachment walls. A performance characteristic curve related to only the oscillatory frequency f and Reynolds number Re was found to be insensitive to the jet nozzle width and feedback channel width, even for asymmetric feedback channels f(Hz)=7.67·exp(–α/2.56)+31.2·exp(–α/0.554)+0.757, where α=ln(Re)/f]. The characteristic curve can be used to measure the flow rates of liquids through a feedback fluidic flowmeter with curved attachment walls without the need for frequent calibrations.