Investigation on ultralight particle dispersions in dense two-phase flow using a kinetic friction stress model
The graphite particle dispersion characteristics with irregular shapes of dense gas-solid turbulent flow in downer reactor is numerically investigated using an improved kinetic friction stress model and a adopted drag coefficient describing momentum transfer between gas and non-spherical particles....
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2021-08-01
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| Series: | Case Studies in Thermal Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X21002598 |
| _version_ | 1818581054850596864 |
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| author | Yang Liu Guohui Li Xiangli Li Lixing Zhou |
| author_facet | Yang Liu Guohui Li Xiangli Li Lixing Zhou |
| author_sort | Yang Liu |
| collection | DOAJ |
| description | The graphite particle dispersion characteristics with irregular shapes of dense gas-solid turbulent flow in downer reactor is numerically investigated using an improved kinetic friction stress model and a adopted drag coefficient describing momentum transfer between gas and non-spherical particles. Hydrodynamic predictions are in better line with experimental results. Redistributions of Reynolds normal and shear stresses with strongly anisotropic dispersions are captured. Comparisons to glass bead, ultralight particles elongate the second acceleration length, gather the concentration peaks at near wall region, and weak the maximum dense ring. Maximum kinetic energy at fully development region is approximately 1.2 times larger than that of second acceleration region. Lower particle sphericities are contribution to the enhancement of particle velocity, particle concentration, particle shear stress, particle collision frequency, and granular temperature, except for the reduction of turbulent kinetic energy. The negative amplitudes of shear stresses at fully development regions are approximately 4.0 times larger than those of second acceleration regions. |
| first_indexed | 2024-12-16T07:27:24Z |
| format | Article |
| id | doaj.art-dcd4fa6465fa4a899b10b5ea57eeb172 |
| institution | Directory Open Access Journal |
| issn | 2214-157X |
| language | English |
| last_indexed | 2024-12-16T07:27:24Z |
| publishDate | 2021-08-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj.art-dcd4fa6465fa4a899b10b5ea57eeb1722022-12-21T22:39:29ZengElsevierCase Studies in Thermal Engineering2214-157X2021-08-0126101096Investigation on ultralight particle dispersions in dense two-phase flow using a kinetic friction stress modelYang Liu0Guohui Li1Xiangli Li2Lixing Zhou3School of Aerospace Engineering, Taizhou University, Taizhou, Zhejiang, 318000, China; Department of Engineering Mechanics, Tsinghua University, Beijing, 10084, China; Corresponding author. School of Aerospace Engineering, Taizhou University, Zhejiang, 318000, China.School of Electronic and Information Engineering, Dalian Jiaotong University, Dalian, Liaoning, 116023, ChinaFaculty of Infrastructure Engineering, Dalian University of Technology, Dalian, 116026, ChinaDepartment of Engineering Mechanics, Tsinghua University, Beijing, 10084, ChinaThe graphite particle dispersion characteristics with irregular shapes of dense gas-solid turbulent flow in downer reactor is numerically investigated using an improved kinetic friction stress model and a adopted drag coefficient describing momentum transfer between gas and non-spherical particles. Hydrodynamic predictions are in better line with experimental results. Redistributions of Reynolds normal and shear stresses with strongly anisotropic dispersions are captured. Comparisons to glass bead, ultralight particles elongate the second acceleration length, gather the concentration peaks at near wall region, and weak the maximum dense ring. Maximum kinetic energy at fully development region is approximately 1.2 times larger than that of second acceleration region. Lower particle sphericities are contribution to the enhancement of particle velocity, particle concentration, particle shear stress, particle collision frequency, and granular temperature, except for the reduction of turbulent kinetic energy. The negative amplitudes of shear stresses at fully development regions are approximately 4.0 times larger than those of second acceleration regions.http://www.sciencedirect.com/science/article/pii/S2214157X21002598Kinetic friction stressParticle sphericitiesDense gas-particle flowsHeterogeneous flow structureDowner reactor |
| spellingShingle | Yang Liu Guohui Li Xiangli Li Lixing Zhou Investigation on ultralight particle dispersions in dense two-phase flow using a kinetic friction stress model Case Studies in Thermal Engineering Kinetic friction stress Particle sphericities Dense gas-particle flows Heterogeneous flow structure Downer reactor |
| title | Investigation on ultralight particle dispersions in dense two-phase flow using a kinetic friction stress model |
| title_full | Investigation on ultralight particle dispersions in dense two-phase flow using a kinetic friction stress model |
| title_fullStr | Investigation on ultralight particle dispersions in dense two-phase flow using a kinetic friction stress model |
| title_full_unstemmed | Investigation on ultralight particle dispersions in dense two-phase flow using a kinetic friction stress model |
| title_short | Investigation on ultralight particle dispersions in dense two-phase flow using a kinetic friction stress model |
| title_sort | investigation on ultralight particle dispersions in dense two phase flow using a kinetic friction stress model |
| topic | Kinetic friction stress Particle sphericities Dense gas-particle flows Heterogeneous flow structure Downer reactor |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X21002598 |
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