Hydrodynamics and heat transfer of gas–solid two-phase mixtures flowing through packed beds – a review
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In this paper, a review of the recent development in the field including both hydrodynamics and heat transfer of gas-solid two-phase mixtures flowing through packed beds is presented.Abstract:
Flow of a gas–solid two-phase mixture through a packed bed is relevant to a number of industrial processes such as heat recovery and filtration of dusty flue gases, iron making in shaft reactors, gas purification, and sorption enhanced reaction processes. In spite of the industrial relevance, little work has been reported in the literature. The limited amount of research work has mainly addressed the macroscopic hydrodynamics in terms of pressure drop and solids hold-ups at the ambient temperature. Very little is done, until fairly recent, on solids motion at the single particle level, hydrodynamics at elevated temperatures and heat transfer. This paper reviews the recent development in the field including both the hydrodynamics and heat transfer of gas–solid two-phase mixtures flowing through packed beds, which is believed to represent the state-of-the-art in the field. The review is not aimed to be exhaustive but rather focused on our own work carried out over the past few years in the Institute of Particle Science & Engineering at the University of Leeds. And some of our results are compared with that of other groups.read more
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Determination of the fluidization regimes of bicomponent beds of solid particles and the characteristic velocities of a gas in these beds by the pulsations of the differential pressure in them
TL;DR: In this paper, the possibility of determining the regime of fluidization of a bicomponent bed by the dependences of the statistical characteristics of the pulsations of different pressure in this bed on the velocity of the gas blown through it is demonstrated.
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Co-Fluidization of Fine Particles and Straw Pellets at Room and Elevated Temperatures
TL;DR: In this article, the authors defined a method for the experimental evaluation of the minimum fluidization velocity of a bed compounded of fine and coarse particles mixtures at room and elevated temperatures.
Thermal performance and optimisation of a granular-bed heat recuperator
TL;DR: In this paper, a transient three-dimensional turbulent numerical formulation with non-equilibrium porous medium model was developed to evaluate the thermal and fluid characteristics of a granular bed heat recuperator.
References
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TL;DR: In this article, the origin of Bubbles is discussed, and the theory of Granular Mixtures is presented, along with the application of Kinetic Theory in the field of Continuum Problems.
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Equilibria and kinetics of CO2 adsorption on hydrotalcite adsorbent
Yulong Ding,Esat Alpay +1 more
TL;DR: In this article, the equilibria and kinetics of high temperature CO 2 adsorption on hydrotalcite adsorbent have been studied using semi-technical and bench-scale elution apparatus.
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Voidage variation in packed beds at small column to particle diameter ratio
TL;DR: In this article, a new radial bed porosity model was proposed and experimental data and a radial bed voidage model was presented, which is used to predict the radial bed's voidage and average bed's porosity.