X-ray fluorescence measurements of dissolved gas and cavitation

Duke, Daniel J.; Kastengren, Alan L.; Swantek, Andrew; Matusik, Katarzyna E.; Powell, Christopher F.

doi:10.1007/s00348-016-2250-5

Cited by 23 publications

(37 citation statements)

References 48 publications

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“…The 2D cavitating nozzle used here is axisymmetric with sharp inlet edge and a diameter of 500 μm and a length of 2.5mm. Detailed descriptions can be found in [6]. For computational efficiency reason, 1 8 ⁄ of the original geometry configuration has been simulated, as shown in Fig.…”

Section: 31mentioning

confidence: 99%

“…The main aim of this work is to investigate the effect of non-condensable gas on the cavitation phenomenon using the 6EQ-PR model. Previous researchers like Duke et al, [6,7,14] have demonstrated the effect of non-condensable gas on cavitation using a standardized fuel and also degassed fuel through X-ray radiography experiments. Then Battistoni et al, [2] further studied these effects by numerical modeling with Homogeneous Relaxation Model (HRM).…”

Section: Introductionmentioning

confidence: 99%

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Cavitation Modelling Using Real-Fluid Equation of State

Yang¹,

Habchi²,

Yi³

et al. 2018

Proceedings of the 10th International Symposium on Cavitation (CAV2018)

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The aim of this work is to improve the accuracy of cavitating flow simulations by considering realfuel mixture thermodynamics, like gas (air) solubility and physical property deviations from ideality, and their effects on phase change. In this work, a new fully compressible two-phase six-equations model coupled with Peng and Robinson [1] real-fluid cubic equation of state (PR-EOS) is described. Assuming thermodynamic equilibrium with negligible capillarity, this diffuse interface model has been implemented in the IFP-C3D solver [3], which already includes the Gibbs Energy Relaxation Method (GERM) cavitation model [10]. One-dimensional academic test cases (cavitation-tube, shock-tube) are performed firstly to validate the real-fluid PR-EOS implementation. Comparisons of the numerical results with previously published works are also carried out. Then, the models have been applied to simulate the cavitation phenomenon inside a single-hole nozzle. With phase equilibrium theory, the simulation has proved that increased dissolved gas may facilitate gaseous cavitation and restrict the developing of vaporous cavitation. The effect of dissolved gas on fuel properties has also been presented and discussed using the suggested real fluid model. Overall, the two fluid model combined with real equation of state is able to reveal more physical details about the cavitation process.

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Section: 31mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cavitation Modelling Using Real-Fluid Equation of State

Yang¹,

Habchi²,

Yi³

et al. 2018

Proceedings of the 10th International Symposium on Cavitation (CAV2018)

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“…Cavitation is the occurrence of vapor cavities at very low static pressure in fast liquid flows, playing an important role in different engineering applications such as fuel injection nozzles [1][2][3], ship propellers [4] and hydraulic systems [5]. In the first example, cavitation can cause instabilities and flow rate fluctuations that lead to improved vaporization of the fuel.…”

Section: Introductionmentioning

confidence: 99%

“…However, even with such a highly sophisticated experimental technique, it renders it very difficult to measure cavitation structures or the actual void fraction in flows with cavitation. Hence, in recent years, radiological methods have become increasingly common to investigate multiphase flows such as flows with cavitation in nozzles [2,[12][13][14], pipes [15], pumps [16] and obstacles [17][18][19][20]. The reason for choosing these techniques lays in the fact, that with radiation of higher energy, scattering effects at the phase boundary between the liquid and the gas can be neglected.…”

Section: Introductionmentioning

confidence: 99%

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High-speed x-ray CT imaging of a strongly cavitating nozzle flow

2018

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Examining or imaging of internal structures in flows with cavitation is still one of the greatest challenges in this field of research. In a specially designed nozzle, a strong cavitation region (CR) is generated with a liquid core (LC) in the center, surrounded by vapour. While it is almost not feasible to visualize the inside of the CR with visible light, it is shown that with high-speed x-ray computed tomography it is possible to visualize the dynamics of the unsteady cavitational flow structures inside the CR. The observed phenomena start with a ring of cavitation and small amounts of vapour inside the LC at / near the entrance of the cavitation channel. Further downstream the cavitation is growing rapidly and cavitation structures inside the LC can be identified. In addition the results are compared with former time averaged CT images of the same nozzle and with results obtained from high-speed videography.

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