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| 1 | Two-fluid modeling of Geldart A particles in gas-fluidized beds显示文摘We have investigated the effect of cohesion and drag models on the bed hydrodynamics of Geldart A particles based on the two-fluid (TF) model. For a high gas velocity U0 = 0.03 m/s, we found a transition from the homogeneous fluidization to bubbling fluidization with an increase of the coefficient C1, which is used to account for the contribution of cohesion to the excess compressibility. Thus cohesion can play a role in the bed expansion of Geldart A particles. Apart from cohesion, we have also investigated the influence of the drag models. When using the Wen and Yu drag correlation with an exponent n = 4.65, we find an under-prediction of the bed expansion at low gas velocities (U0 = 0.009 m/s). When using a larger exponent (n = 9.6), as reported in experimental studies of gas-fluidization, a much better agreement with the experimental bed expansion is obtained. These findings suggest that at low gas velocity, a scale-down of the commonly used drag model is required. On the other hand, a scale-up of the commonly used drag model is necessary at high gas velocity (U0 = 0.2 and 0.06 m/s). We therefore conclude that scaling the drag force represent only an ad hoc way of repairing the deficiencies of the TF model, and that a far more detailed study is required into the origin of the failure of the TF model for simulating fluidized beds of fine powders. | M.A. van der Hoef J.A.M. Kuipers | 2008 | Particuology2008，6，6： | 16 |
| 2 | Coefficient of restitution for particles impacting on wet surfaces: An improved experimental approach显示文摘 | B. Cunger V. Salikov S. Heinrich S. Antonyuk V.S. Sutkar N.G. Deen J.A.M. Kuipers | 2016 | Particuology2016，14，2： | 4 |
| 3 | Borescopic particle image velocimetry in bubbling gas-solid fluidized beds显示文摘In this work, the borescopic particle image velocimetry (BPIV) technique was applied to a bubbling gas-solid fluidized bed, and the results were compared with published positron emission particle tracking (PEPT) measurement data. Before performing the experiments, the sensitivity of the BPIV results to the illumination power, light reflectivity of the particles, and location of the borescope was also investigated. The BPIV and PEPT results were in fair agreement;however, some discrepancies were observed.The difference between the two sets of results were mainly caused by the intrusiveness of BPIV, the fact that the local solids volume fraction was not accounted for in the BPIV analysis, and the intrinsic differences of these two methods. Therefore, measurement of the local solids volume fraction with the borescope is highly recommended for further development of the BPIV method, which will also enable measureme nt of the local solids mass fluxes in side dense gas-solid fluidized beds. | M. Banaei R. Dellaert N.G. Deen J.A.M. Kuipers M. van Sint Annaland | 2019 | Particuology2019，17，2： | 2 |
| 4 | Gas–solid interaction force from direct numerical simulation (DNS) of binary systems with extreme diameter ratios显示文摘Fluid-particle systems as commonly encountered in chemical, metallurgical and petroleum industries are mostly polydisperse in nature. However, the relations used to describe fluid-particle interactions are originally derived from monodisperse systems, with ad hoc modifications to account for polydispersity. In previous work it was shown that for bidisperse systems with moderate diameter ratios of 1:2 to 1:4, this approach leads to discrepancies, and a correction factor is needed. In this work we demonstrate that this correction factor also holds for more extreme diameter ratios of 1:5, 1:7 and 1:10, although the force on the large particles is slightly overestimated when using the correction factor. The main origin of the correction is that the void surrounding the large particles becomes less in case of a bidisperse mixture, as compared to a monodisperse system with the same volume fraction. We further investigated this discrepancy by calculating the volume per particle by means of Voronoi tessellation. | S. Sarkar S.H.L. Kriebitzsch M.A. van der Hoef J.A.M. Kuipers | 2009 | Particuology2009，7，4： | 2 |
| 5 | From bubbling to turbulent fluidization: Advanced onset of regime transition in micro-fluidized beds显示文摘 | Junwu Wang Lianghui Tan M.A. van der Hoef M. van Sint Annaland J.A.M. Kuipers | 2011 | Chemical Engineering Science2011，，9： | 1 |
| 6 | Fluidization with hot compressed water in micro-reactors显示文摘 | B. Potic S.R.A. Kersten M. Ye M.A. van der Hoef J.A.M. Kuipers W.P.M. van Swaaij | 2005 | Chemical Engineering Science2005，，22： | 1 |
| 7 | Discrete particle simulation of bubble and slug formation in a two-dimensional gas-fluidised bed: A hard-sphere approach显示文摘 | B.P.B. Hoomans J.A.M. Kuipers W.J. Briels W.P.M. van Swaaij | 1995 | Chemical Engineering Science1995，，1： | 1 |
| 8 | Cryogenic CO 2 capture using dynamically operated packed beds显示文摘 | M.J. Tuinier M. van Sint Annaland G.J. Kramer J.A.M. Kuipers | 2009 | Chemical Engineering Science2009，，1： | 1 |
| 9 | Numerical simulation of the dynamic flow behavior in a bubble column: A study of closures for turbulence and interface forces显示文摘 | D. Zhang N.G. Deen J.A.M. Kuipers | 2006 | Chemical Engineering Science2006，，23： | 1 |
| 10 | Kinetics of the partial oxidation of methanol over a Fe-Mo catalyst显示文摘 | S.A.R.K. Deshmukh M. van Sint Annaland J.A.M. Kuipers | 2005 | Applied Catalysis A General2005，，2： | 1 |
| 11 | Spout fluidized beds: Recent advances in experimental and numerical studies显示文摘 | Vinayak S. Sutkar Niels G. Deen J.A.M. Kuipers | 2013 | Chemical Engineering Science2013，，： | 1 |
| 12 | Factors associated with reduced early survival in the Oxford phase III medial unicompartment knee replacement显示文摘 | Bart M. Kuipers Boudewijn J. Kollen Peter C. Kaijser Bots Bart J. Burger Jos J.A.M. van Raay Niek J.A. Tulp Cees C.P.M. Verheyen | 2009 | The Knee2009，，1： | 1 |
| 13 | Particle mixing rates using the two-fluid model显示文摘 | M. Banaei N.G. Deen M. van Sint Annaland J.A.M. Kuipers | 2018 | Particuology2018，16，1： | 0 |
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