An integrated modeling approach for design and optimization of ejector pumps carrying two-phase fluid
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An ejector pump uses a primary flow as a motive fluid to entrain another fluid, and can work with both incompressible flow and compressible flow, in either as a singlephase or two-phase mixture. Determining the behavior of the two-phase flow inside the ejector with different geometric parameters was the objective of this research. Three approaches were used to predict the performance and the capture the flow behavior inside it. An analytical model used the geometric parameters to calculate the loss factors for the first time and work as a basis for the two-phase flow ejectors. A fluid transportation system was built to verify analytical and numerical predictions and to explore optimum. Using a fitting parameter to capture the flow behavior inside the ejector was crucial for the accuracy of the numerical model. The fitting parameter is a new technique that uses an arbitrary fluid to match the induced air measurements numerically with the ones founded experimentally. To apply the three approaches, nine ejectors were built with different geometric parameters. The nozzle exit diameters are tested at three levels while the length mixing tube are tested at three levels as well. The results reveal that the diffuser angle of 5[degrees], the smallest nozzle exit diameter, and the longest mixing tube result on maximum efficiency and highest induced air. More investigation of two-phase ejectors is important to fully understand flow behavior and to increase efficiency. There are many improvements needed to this work in future.
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