Simplified correlations of axial dispersion coefficient and porosity in a solid-liquid fluidized bed adsorber

Khaled, Ghozlane; Bourouına-Bacha, Saliha; Sabiri, Nour-Eddine; Tighzert, Hamid; Kechroud, Nassima; Bourouina, Mustapha

doi:10.1016/j.expthermflusci.2017.06.008

Cited by 5 publications

(2 citation statements)

References 34 publications

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“…Based on the measured geometric values, we found a negative correlation between the dispersion coefficient and stream velocity. This is opposite to the correlation reported by Khaled et al [59]. However, besides the flow regime, other important variables such as roughness (i.e., the composition of vegetation and substrate), lateral inflow from the tributaries, and geography (e.g., slope, depth, and width) are also considerably important [38,39,60].…”

Section: Mass Transport Of Radionuclidesmentioning

confidence: 78%

Landslide-Induced Mass Transport of Radionuclides along Transboundary Mailuu-Suu River Networks in Central Asia

Torgoev

Zaredinov

et al. 2021

Remote Sensing

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Seismically triggered landslides are a major hazard and have caused severe secondary losses. This problem is especially important in the seismic prone Mailuu-Suu catchment in Kyrgyzstan, as it hosts disproportionately sensitive active or legacy uranium sites with deposited radioactive extractive wastes. These sites show a quasi-continuous release of radioactive contamination into surface waters, and especially after natural hazards, a sudden and massive input of pollutants into the surface waters is expected. However, landslides of contaminated sediments into surface waters represent a substantial exposure pathway that has not been properly addressed in the existing river basin management to date. To fill this gap, satellite imagery was massively employed to extract topography and geometric information, and the seismic Scoops3D and the one-dimensional numerical model, Hydrologic Engineering Centre, River Analysis System (HEC-RAS), were chosen to simulate the landslide-induced mass transport of total suspended solids (TSS) and natural radionuclides (Pb-210 as a proxy for modeling purposes) within the Mailuu-Suu river networks under two earthquake and two hydrological scenarios. The results show that the seismically vulnerable areas dominated in the upstream areas, and the mass of landslides increased dramatically with the increase of earthquake levels. After the landslides, the concentrations of radionuclides increased suddenly and dramatically. The peak values decreased along the longitudinal gradient of river networks, with the concentration curves becoming flat and wide in the downstream sections, and the transport speed of radionuclides decreased along the river networks. The conclusions of this study are that landslides commonly release a significant amount of pollutants with a relatively fast transport along river networks. Improved quantitative understanding of waterborne pollution dispersion across national borders will contribute to better co-ordination between governments and regulatory authorities of riparian states and, consequently, to future prevention of transnational political conflicts that have flared up in the last two decades over alleged pollution of transboundary water bodies.

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Section: Mass Transport Of Radionuclidesmentioning

confidence: 78%

Landslide-Induced Mass Transport of Radionuclides along Transboundary Mailuu-Suu River Networks in Central Asia

Torgoev

Zaredinov

et al. 2021

Remote Sensing

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“…In [49], the coal and syngas combustion method in a circulating fluidized bed (CFB) was presented. Adsorption processes in fluidized bed columns were analyzed in [50]. A fluidized bed dryer was examined in [51,52] to explore the efficient drying of biomass.…”

Section: Introductionmentioning

confidence: 99%

Implementation of Fluidized Bed Concept to Improve Heat Transfer in Ecological Adsorption Cooling and Desalination Systems

Grabowska,

Krzywanski,

Zylka

et al. 2024

Energies

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Sustainable development policy focuses on reducing the carbon footprint generated by the global industry and energy sector. Replacing conventional energy sources with environmentally friendly ones requires advanced research to increase energy efficiency and reduce the instability and intermittence of renewable sources. Moreover, adsorption chillers are an opportunity to introduce net-zero emission technologies to the refrigeration, air-conditioning, and desalination industries. Adsorption devices could be popularized if a method of effective heat transfer in the volume of the adsorption bed is developed. The innovative concept of introducing fluidized beds into the adsorption system can achieve the most promising results in improving energy efficiency. To confirm the adopted assumption, heat transfer coefficient calculations for the packed and fluidized bed were carried out in this paper based on experimental tests and literature data. The empirical research aims to extend the fundamental knowledge in the implementation of fluidization under low-pressure conditions, characteristic of the adsorption systems’ working cycle. Experiments were conducted on a unique test stand equipped with the Intensified Heat Transfer Adsorption Bed (IHTAB) reactor prototype. Five adsorption bed samples were analyzed. The reference sample consisted only of silica gel, and the subsequent ones contained aluminum or carbon nanotubes with 5 and 10% additions. In the case of samples with admixtures, the fluidized state increased the heat transfer coefficient on average from approx. 36.9 W/m2 K to approx. 245.4 W/m2 K.

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Determination of Bodenstein number and axial dispersion of a triangular external loop airlift reactor

Shadpoor

Pirouzi

Hamze

et al. 2021

Chemical Engineering Research and Design

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Simplified correlations of axial dispersion coefficient and porosity in a solid-liquid fluidized bed adsorber

Cited by 5 publications

References 34 publications

Landslide-Induced Mass Transport of Radionuclides along Transboundary Mailuu-Suu River Networks in Central Asia

Landslide-Induced Mass Transport of Radionuclides along Transboundary Mailuu-Suu River Networks in Central Asia

Implementation of Fluidized Bed Concept to Improve Heat Transfer in Ecological Adsorption Cooling and Desalination Systems

Determination of Bodenstein number and axial dispersion of a triangular external loop airlift reactor

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