Author
J.A.M. Kuipers
Other affiliations: Eindhoven University of Technology
Bio: J.A.M. Kuipers is an academic researcher from University of Twente. The author has contributed to research in topics: Particle & Turbulence. The author has an hindex of 26, co-authored 59 publications receiving 2101 citations. Previous affiliations of J.A.M. Kuipers include Eindhoven University of Technology.
Topics: Particle, Turbulence, Fluidized bed, Membrane reactor, Two-phase flow
Papers published on a yearly basis
Papers
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TL;DR: In this article, the results of gas-liquid absorption experiments were evaluated using the Taylor-Aris dispersion method and the viscosities were measured with a falling ball viscometer at temperatures ranging from 293 to 333 K.
Abstract: To evaluate quantitatively the results of gas-liquid absorption experiments, accurate liquid-phase diffusion coefficients and viscosities are needed. In this paper experimental values of these quantities will be reported for the binary systems carbon dioxide + water, carbon dioxide + methanol, ammonia + water, and ammonia + methanol. The diffusion coefficients have been measured using the Taylor-Aris dispersion method, and the viscosities have been measured with a falling ball viscometer at temperatures from 293 to 333 K. The ammonia mole fraction ranged from 0 to 0.312. The results have been correlated using Arrhenius-type equations and have been compared with literature data, where available. Furthermore, the measured diffusion coefficients are compared with values predicted by the modified Stokes-Einstein equation and the Wilke-Chang equation.
224 citations
TL;DR: In this article, a contact model was developed to describe the force-displacement behavior of elastic-plastic granules, and the authors measured the energy absorption during compression (slow stressing velocity of 0.02 mm/s) and impact (the impact velocity of 4.5 m/s).
Abstract: The discrete modelling and understanding of the particle dynamics in fluidized bed apparatuses, mixers, mills and others are based on the knowledge about the physical properties of particles and their mechanical behaviour during slow, fast and repeated stressing. In this paper model parameters (modulus of elasticity, stiffness, yield pressure, restitution coefficient and strength) of spherical granules (γ-Al2O3, zeolites 4A and 13X, sodium benzoate) with different mechanical behaviour have been measured by single particle compression and impact tests. Starting with the elastic compression behaviour of granules as described by Hertz theory, a new contact model was developed to describe the force-displacement behaviour of elastic-plastic granules. The aim of this work is to understand the energy absorption during compression (slow stressing velocity of 0.02 mm/s) and impact (the impact velocity of 0.5–4.5 m/s) of granules. For all examined granules the estimated energy absorption during the impact is found to be far lower than that during compression. Moreover, the measured restitution coefficient is independent of the impact velocity in the examined range and independent of the load intensity by compression (i.e. maximum compressive load). In the case of repeated loading with a constant load amplitude, the granules show cyclic hardening with increasing restitution coefficient up to a certain saturation in the plastic deformation. A model was proposed to describe the increase of the contact stiffness with the number of cycles. When the load amplitude is subsequently increased, further plastic deformation takes place and the restitution coefficient strongly decreases.
218 citations
TL;DR: In this article, a discrete particle method based on molecular dynamics techniques was used to explore the mechanisms underlying the formation of heterogeneous flow structures in gas-particle flows, and the impact of non-linear drag force on the flow structure formation in dense gas-fluidized beds was examined for both ideal and non-ideal particles.
131 citations
TL;DR: Using the proposed method, a homogeneous bubbly flow in a laboratory scale bubble column can be simulated at very high gas hold-up (37%) while consuming a reasonable amount of calculation wall time.
127 citations
TL;DR: In this article, the effects of particle and gas properties on the fluidization behavior of Geldart A particles are studied, with focus on the predictions of Umf and Umb, which are compared with the classical empirical correlations due to Abrahamsen and geldart [1980].
120 citations
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TL;DR: Fast pyrolysis for production of liquids has developed considerably since the first experiments in the late 1970s as mentioned in this paper, leading to significant advances in process development and a wide range of reactor configurations that have been developed to meet the stringent requirements for high yields of useful liquids, for use as a fuel in boilers, engines and turbines and as a source of chemical commodities.
Abstract: Fast pyrolysis for production of liquids has developed considerably since the first experiments in the late 1970s. Many reactors and processes have been investigated and developed to the point where fast pyrolysis is now an accepted feasible and viable route to renewable liquid fuels, chemicals and derived products. It is also now clear that liquid products offer significant advantages in storage and transport over gas and heat. These advantages have caused greater attention to be paid to fast pyrolysis, leading to significant advances in process development. The technology of fast pyrolysis for liquids is noteworthy for the wide range of reactor configurations that have been developed to meet the stringent requirements for high yields of useful liquids, for use as a fuel in boilers, engines and turbines and as a source of chemical commodities. This review summarizes the key features of fast pyrolysis and the resultant liquid product and describes the major reaction systems and processes that have been developed over the last 20 years.
1,686 citations
TL;DR: This paper reviews the work in this area with special reference to the discrete element method and associated theoretical developments, and covers three important aspects: models for the calculation of the particle–particle and particle–fluid interaction forces, coupling of discrete elements method with computational fluid dynamics to describe particle-fluid flow, and the theories for linking discrete to continuum modelling.
1,563 citations
TL;DR: This review presents a comprehensive description of the current pathways for recycling of polymers, via both mechanical and chemical recycling, and discusses the main challenges and some potential remedies to these recycling strategies, thus providing an academic angle as well as an applied one.
1,352 citations
TL;DR: Zhu et al. as discussed by the authors provided a summary of the studies based on discrete particle simulation in the past two decades or so, with emphasis on the microdynamics including packing/flow structure and particle-particle, particle-fluid and particle wall interaction forces.
1,253 citations
TL;DR: In this paper, a discrete particle model of a gas-fluidized bed was developed and in this the two-dimensional motion of the individual, spherical particles was directly calculated from the forces acting on them, accounting for the interaction between the particles and the interstitial gas phase.
941 citations