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CFD-DEM study of spout incoherence phenomena in a conical spouted bed. POWDER TECHNOL 2022. [DOI: 10.1016/j.powtec.2022.117529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Savari C, Sheikh HA, Barigou M. Lagrangian Recurrence Tracking: A Novel Approach for Description of Mixing in Liquid and Particle–Liquid Flows. Ind Eng Chem Res 2021. [DOI: 10.1021/acs.iecr.1c04101] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chiya Savari
- School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham B15 2TT, U.K
| | - Hamzah A. Sheikh
- School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham B15 2TT, U.K
| | - Mostafa Barigou
- School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham B15 2TT, U.K
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Amiri V, Kamrani S, Ahmad A, Bhattacharya P, Mansoori J. Groundwater quality evaluation using Shannon information theory and human health risk assessment in Yazd province, central plateau of Iran. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:1108-1130. [PMID: 32833173 DOI: 10.1007/s11356-020-10362-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Accepted: 08/03/2020] [Indexed: 06/11/2023]
Abstract
This study aims to evaluate the quality of groundwater in the most arid province of Iran, Yazd. It is highly dependent on groundwater resources to meet the domestic, industrial, and agricultural water demand. Position of water samples on the modified Gibbs diagram demonstrates that the interaction with silicates and the increase in direct cation exchange are responsible for the increased salinity of groundwater. Based on entropy theory, the decreasing order of importance of variables in controlling groundwater chemistry is Fe > As > Ba > Hg > NO2 > Pb > K > Cl > Na > Mg > SO4 > NO3 > HCO3 > Ca. The results of entropy weighted water quality index (EWWQI) calculation show that about 34 and 32% of 206 samples in the wet and dry seasons, respectively, are classified as extremely poor quality (ranks 4 and 5). Approximately 60 and 55% of 206 samples in wet and dry seasons, respectively, have excellent, good, and medium quality (ranks 1, 2, and 3). The non-carcinogenic human health risk (NHHR) from intake and dermal contact pathways using deterministic approach show that 36 and 17 samples in both seasons are not suitable for drinking by children. Furthermore, 9 and 2 samples are not suitable for drinking by adults. The results show that children are more vulnerable than adults to these health risks. The non-carcinogenic risks through dermal contact were negligible.
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Affiliation(s)
- Vahab Amiri
- Department of Geology, Faculty of Science, Yazd University, Yazd, Iran.
| | - Salahaddin Kamrani
- Deputy for Technology Innovation and Commercialization Development, VPST, Tehran, Iran
- Department of Applied Geology, Faculty of Earth Sciences, Kharazmi University, Tehran, Iran
| | - Arslan Ahmad
- SIBELCO Ankerpoort NV, Op de Bos 300, EP, 6223, Maastricht, The Netherlands
- KWR Water Cycle Research Institute, Groningenhaven 7, 3433 PE, Nieuwegein, The Netherlands
- Department of Environmental Technology, Wageningen University and Research (WUR), Droevendaalsesteeg 4, 6708, PB, Wageningen, The Netherlands
| | - Prosun Bhattacharya
- KWR Water Cycle Research Institute, Groningenhaven 7, 3433 PE, Nieuwegein, The Netherlands
- KTH-International Groundwater Arsenic Research Group, Department of Sustainable Development, Environmental Science and Engineering, KTH Royal Institute of Technology, Teknikringen 10B, SE-10044, Stockholm, Sweden
| | - Javad Mansoori
- Yazd Regional Water Authority, Ministry of Energy, Yazd, Iran
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Rahmani A, Tamtaji M, Dehkordi AM. Numerical Simulation of A Cubic Spout-Fluid Bed: Influences of Inlet Gas Temperature and Jet to Bed Cross-Section Ratio. INTERNATIONAL JOURNAL OF CHEMICAL REACTOR ENGINEERING 2020. [DOI: 10.1515/ijcre-2019-0144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractIn this paper, we study the role of inlet gas temperature and jet to bed cross-section ratio on hydrodynamics and circulation patterns of particles in a spout-fluid bed. The system is modeled using CFD-TFM approach based on Eulerian-Eulerian method. Simulation results are validated by experimental data measured by (Link 2008. “PEPT and Discrete Particle Simulation Study of Spout-fluid Bed Regimes.” Aiche Journal 54 (5): 1189–202). First, the sensitivity analysis of simulation results versus the most significant parameters are conducted to find the optimum values for each parameter. Subsequently, the role of inlet gas temperature and cross-section ratios are studied in detail. The simulation results clearly demonstrate that increasing the inlet gas temperature raises particles’ velocity in the bed and affects the circulation pattern in annulus region. Additionally, it is shown that higher gas temperature leads to existence of hot spots in the annulus region. In case of jet to bed cross-section ratio, using larger ratios results in higher velocities and lower pressure drop along the bed.
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Affiliation(s)
- Ali Rahmani
- Okinawa Institute of Science and Technology Graduate University, Tancha, Okinawa, 904-0495Kunigami-gun, Japan
- Chemical and Petroleum Engineering, Sharif University of Technology, Tehran11365, Iran (the Islamic Republic of)
| | - Mohsen Tamtaji
- Chemical and Petroleum Engineering, Sharif University of Technology, Tehran11365, Iran (the Islamic Republic of)
| | - Asghar Molaei Dehkordi
- Chemical and Petroleum Engineering, Sharif University of Technology, Tehran11365, Iran (the Islamic Republic of)
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Wu F, Che X, Huang Z, Duan H, Ma X, Zhou W. Numerical Study on the Gas-Solid Flow in a Spouted Bed Installed with a Controllable Nozzle and a Swirling Flow Generator. ACS OMEGA 2020; 5:1014-1024. [PMID: 31984257 PMCID: PMC6977066 DOI: 10.1021/acsomega.9b02704] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Accepted: 12/24/2019] [Indexed: 06/10/2023]
Abstract
The swirling flow technology is adopted on a nozzle of the spouted bed in order to enhance the radial movement of the particles. The hydrodynamic characteristics in a spouted bed with a swirling flow generator installed on the nozzle are numerically investigated based on the two-fluid model (TFM). The traditional spouted bed and spouted bed with an integral swirling blade nozzle (ISBN) are simulated and analyzed. Numerical results show that the dead zone at the cone region of the annulus can be effectively eliminated by using the ISBN. The maximum decrease in particle concentration near the cone region is 72%, and the ISBN structure can significantly improve the comprehensive fluidization degree of the spouted bed when γ equals 86°. The turbulent kinetic energy of gas can be significantly increased by the swirling flow along the radial direction in the spouted bed, especially in the spout region. Also, the swirling flow can promote the radial velocity and granular temperature of the particles in the spouted bed, which is helpful to the radial mixing of particles and gas phase between the central spout and the annulus in the spouted bed. There exists a value of ξ (equals 0.526), which brings the greatest elimination effect of the flow dead zone in the annulus of the limited spouted bed space, and the overall fluidization of the spouted bed has the best performance when ξ = 0.316.
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Affiliation(s)
- Feng Wu
- School
of Chemical Engineering, Northwest University, Xi’an 710069, China
| | - Xinxin Che
- School
of Chemical Engineering, Northwest University, Xi’an 710069, China
| | - Zhenyu Huang
- School
of Chemical Engineering, Northwest University, Xi’an 710069, China
| | - Haojie Duan
- School
of Chemical Engineering, Northwest University, Xi’an 710069, China
| | - Xiaoxun Ma
- School
of Chemical Engineering, Northwest University, Xi’an 710069, China
| | - Wenjing Zhou
- School
of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an 710049, China
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