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A computational fluid dynamics model is used to predict the oscillatory flowthrough tapered cylindrical tube sections (jet pumps). The asymmetric shape ofjet pumps results in a time-averaged pressure drop that can be used to suppressGedeon streaming in closed-loop thermoacoustic devices. However, previous workhas shown that flow separation in the diverging flow direction counteracts thetime-averaged pressure drop. In this work, the characteristics of flowseparation in jet pumps are identified and coupled with the observed jet pumpperformance. Furthermore, it is shown that the onset of flow separation can beshifted to larger displacement amplitudes by designs that have a smoothertransition between the small opening and the tapered surface of the jet pump.These design alterations also reduce the duration of separated flow, resultingin more effective and robust jet pumps. To make the proposed jet pump designsmore compact without reducing their performance, the minimum big opening radiusthat can be implemented before the local minor losses have an influence on thejet pump performance is investigated. To validate the numerical results, theyare compared with experimental results for one of the proposed jet pumpdesigns.

Characterization and reduction of flow separation in jet pumps for laminar oscillatory flows