STUDIO TEORICO E SPERIMENTALE DI EIETTORI A VAPORE E A GAS

Steam and gas jet ejectors are an essential part in concentration, desalinization, refrigeration and vacuum production of food industries and not only. The ejector theory saw the contribution of many authors in the time, among them stand out Munday and Bagster. But many experimental studies showed this theory too optimist. In this work some changes at the theory concerning the diffusion fenomena was proposed. Furthermore a modifications of momentum equation and energy equation were proposed to consider the primary and aspirated gas as different fluids. To evaluate the modified theory, an experimental ejector was assembled and tested and, in comparison with Munday and Bagster theory, an improvement was estimated. In addition the two mathematical models was compared with further experimental data from scientific literature. The values of the average error between the calculated and experimental ejection coefficient was 42,2% and –3,9% for the old and modified theory, respectively.