Dimensional analysis-based head loss calculation for the micro-pressure filtering and washing tank

Filtering is an important measure for the prevention of emitter clogging in micro-irrigation systems. Head loss and energy consumption are two problems in pressurized irrigation systems. Therefore, a combined filtration device - micro-pressure filtering and washing tank - was designed. In this study, the micro-pressure filtering and washing tank was taken as the research object, and the physical model test of an inlet flow and sediment concentration was carried out. The head loss prediction model of micro-pressure filtering and washing tank under clean water and muddy water conditions was established by dimensional and multiple regression analyses, and the determination coefficients (R-2) were 0.987 and 0.953, respectively. In addition, the test data were used to validate the head loss prediction model for muddy water. The average relative error of the predicted values was 3.36%, suggesting that the proposed models are ideal for head loss prediction. The research results can provide technical support for the structure optimization and filtration mechanism of micro-pressure filtering and washing tank, and enrich the theory of micro-pressure filtration.