On the Influence of Particles Characteristics on Moisture Diffusivity during Drying of Granular Porous Media

Freire, José Teixeira; Freire, Fábio Bentes; Perazzini, Hugo

doi:10.4236/aces.2014.41002

Cited by 11 publications

(3 citation statements)

References 8 publications

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“…In general, smaller particles with broader PSD have higher propensities to form particle− particle bridges. As reported by Freire et al (2014), 23 vapor and liquid diffusion into the cake is regulated by the cake tortuosity and cake porosity properties. When the cake is formed, the PSD plays a major part in defining tortuosity, which is an important contributor to the resistance to gas flow and hence gas velocity and the opportunity for the gas to contact the wet crystal surfaces and remove the residual solvent left from the washing process.…”

Section: Model Validation Experimentsmentioning

confidence: 99%

Understanding API Static Drying with Hot Gas Flow: Design and Test of a Drying Rig Prototype and Drying Modeling Development

Ottoboni

Coleman

Steven

et al. 2020

Org. Process Res. Dev.

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Developing a continuous isolation process to produce a pure, dry, free-flowing active pharmaceutical ingredient (API) is the final barrier to the implementation of continuous end-to-end pharmaceutical manufacturing. Recent work has led to the development of continuous filtration and washing prototypes for pharmaceutical process development and small-scale manufacture. Here, we address the challenge of static drying of a solvent-wet crystalline API in a fixed bed to facilitate the design of a continuous filter dryer for pharmaceutical development, without excessive particle breakage or the formation of interparticle bridges leading to lump formation. We demonstrate the feasibility of drying small batches on a time scale suitable for continuous manufacturing, complemented by the development of a drying model that provides a design tool for process development. We also evaluate the impact of alternative washing and drying approaches on particle agglomeration. We conclude that our approach yields effective technology, with a performance that is amenable to predictive modeling.

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Section: Model Validation Experimentsmentioning

confidence: 99%

Understanding API Static Drying with Hot Gas Flow: Design and Test of a Drying Rig Prototype and Drying Modeling Development

Ottoboni

Coleman

Steven

et al. 2020

Org. Process Res. Dev.

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show abstract

“…This can be achieved by using adsorption columns filled with some porous adsorptive material coupled to the dryer fluid supply system [32] . The estimated potential drying energy savings must lie between 25 and 30% of the total energy employed in drying, which can be reached by adopting an adequate drying method, modification of the dryer design, or simply by using other drying operating conditions [27] .…”

Section: Energy Aspectsmentioning

confidence: 99%

Thermal Treatment of Solid Wastes Using Drying Technologies: A Review

Perazzini

Freire

et al. 2015

Drying Technology

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The proper treatment of organic or inorganic solid wastes meets economic and especially environmental interests. Added-value by-products of market interest can be obtained through the recovery, reuse and treatment of solid wastes, which are otherwise discarded inappropriately in large quantities in the environment. In this review, the drying process is presented as an alternative environmental technology for the thermal treatment of residues of different natures from different origins. The main techniques applied to solid waste drying are described and in parallel the most relevant studies found in the literature which approaches this theme are analyzed. Moreover, the main dryers used nowadays are presented, as well as their most important characteristics. Some general aspects of the thermal and energetic performance of these dryers fundamental for process feasibility analysis are also discussed in this review. Essential aspects of the solid waste drying process are primarily presented with the purpose of showing the particularities that this theme offers when it comes to putting the theory into practice. Downloaded by [Selcuk Universitesi] at 17:53 05 February 2015 2

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“…The movement of fluid in-between micro and nano-size pores is a combination of diffusion and effusion. A few experimental studies have been conducted so far to model diffusioneffusion driven drying in cemented particulate matter [33]. The lack of knowledge is due to improper understanding of the couple effects, and also the unavailability of the coupled partial differential equations to define the problem considering diffusion-effusion coupled with the heat transfer in unsaturated porous media is a limitation in proper modelling with numerical methods [34].…”

Section: Introductionmentioning

confidence: 99%

Evolution of Temperature Field around Underground Power Cable for Static and Cyclic Heating

et al. 2021

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Power transmission covering long-distances has shifted from overhead high voltage cables to underground power cable systems due to numerous failures under severe weather conditions and electromagnetic pollution. The underground power cable systems are limited by the melting point of the insulator around the conductor, which depends on the surrounding soils’ heat transfer capacity or the thermal conductivity. In the past, numerical and theoretical studies have been conducted based on the mechanistic heat and mass transfer model. However, limited experimental evidence has been provided. Therefore, in this study, we performed a series of experiments for static and cyclic thermal loads with a cylindrical heater embedded in the sand. The results suggest thermal charging of the surrounding dry sand and natural convection within the wet sand. A comparison of heat transfer for dry, unsaturated and fully saturated sand is presented with graphs and colour maps which provide valuable information and insight of heat and mass transfer around an underground power cable. Furthermore, the measurements of thermal conductivity against density, moisture and temperature are presented showing positive nonlinear dependence.

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On the Influence of Particles Characteristics on Moisture Diffusivity during Drying of Granular Porous Media

Cited by 11 publications

References 8 publications

Understanding API Static Drying with Hot Gas Flow: Design and Test of a Drying Rig Prototype and Drying Modeling Development

Understanding API Static Drying with Hot Gas Flow: Design and Test of a Drying Rig Prototype and Drying Modeling Development

Thermal Treatment of Solid Wastes Using Drying Technologies: A Review

Evolution of Temperature Field around Underground Power Cable for Static and Cyclic Heating

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