Abstract
Due to the set of factors and conditions, the stream pressure through the orifice decreases, which can lead to the occurrence of the cavitation phenomenon. The most important factor in this regard is the geometry of orifice. In the first part of this study, the flow through two types of single-hole orifice and a multi-hole orifice were experimentally studied. The results showed that the single hole orifice with a two-sided sloped edge caused less pressure drop, which in order to control the cavitation phenomenon is more efficient compared to the single-hole and multi-hole orifices with one-sided sloped edges and the same equal diameter ratio. Additionally, all experiments were simulated in the second part of this research using finite volume methods. Considering the complexity of the problem, several numerical solutions were investigated to approach the experimental results. Finally, it was determined that the type of gridding, turbulence method, and cavitation model have a great influence on the accuracy of the obtained numerical results.
Highlights
Orifice plates as one of the main and important factors in the matter of energy dissipation and pressure reduction have been exploited in various industrial applications
The results showed that the use of Singhal et al.’s cavitation model in comparison to the other cavitation solving models obtained closer results to the experimental data
The effect of the orifice edge geometry was investigated in the orifices with similar equal diameter ratio (EDR) of 0.4
Summary
Orifice plates as one of the main and important factors in the matter of energy dissipation and pressure reduction have been exploited in various industrial applications. According to the results obtained from their research in single-phase flows through thin orifices, an increase in thickness caused a relative decrease in the pressure drop coefficient. It was concluded from their research that at low cavitation number, maximum shock pressure was observed near the pipe wall of the multi-perforated and cone type orifices and at the downstream edge of the single-hole orifice. Mali et al simulate flow through honeycomb shaped orifices and investigated the effect of various geometrical parameters such as flow area, the spacing between plates, number of plates, orientation between plates (inline or offset) on pressure drop, and cavitation characteristics They reported that the flow pressure meet the lowest values at the orifice throat and near plate exit and an increase in the number of plates reduces the prospect of cavitation. In view of the outcomes obtained by the CFD studies in comparison with the acquired experimental results, cavitation performance for different configurations has been established
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