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|Type:||Artigo de periódico|
|Title:||Improved Two-phase Model For Hydraulic Jet Pumps|
|Abstract:||A new model is proposed to predict the performance of hydraulic jet pumps (HJP's) when pumping two-phase gas-liquid mixtures. The model performance is compared with the models of Petrie et al.1 and Jiao et al.2; input data were the measurements taken by Jiao3 when testing an industrial HJP. The present model results from the application of the one-dimensional conservation law of mass, momentum, and energy to the gas-liquid flow throughout the HJP. It differs from the previous published ones because it takes into account the flow of the two-phase compressible homogeneous mixture along the different parts of the device. It is not just an adaptation of a model originally developed for single-phase flows. Until now, most models representing the flow of a gas-liquid mixture in an HJP were adapted from models developed for incompressible single-phase flows. The gas compressibility, for instance, is fully considered, as was done by Cunningham4 when modeling a jet pump driven by a gas. The solution of the proposed model requires the knowledge of two constant energy dissipation factors, i.e., flow inside the nozzle and flow inside the throat. The best values for these factors were obtained by performing a regression analysis over the data of Jiao The results showed a consistently better agreement, over the full range of the operational variables, with the experimental data than those delivered by the existing models.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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