Air Entrainment and Dust Generation from a Falling Stream of Bulk Material
Bulk materials handling operations involving falling streams of the bulk material are common throughout industry. Proper design of any fugitive dust control system servicing such operations requires knowledge of the behaviour of the free-falli...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Hosokawa Powder Technology Foundation
2014-05-01
|
| Series: | KONA Powder and Particle Journal |
| Online Access: | https://www.jstage.jst.go.jp/article/kona/13/0/13_1995017/_pdf/-char/en |
| _version_ | 1818342661132648448 |
|---|---|
| author | Paul Cooper Peter Arnold |
| author_facet | Paul Cooper Peter Arnold |
| author_sort | Paul Cooper |
| collection | DOAJ |
| description | Bulk materials handling operations involving falling streams of the bulk material are common throughout industry. Proper design of any fugitive dust control system servicing such operations requires knowledge of the behaviour of the free-falling stream in terms of the air entrained by the falling material and the concentration of dust liberated. In this paper results of experiments on alumina powder free-falling from a hopper are presented. It was found that the material stream initially contracts in cross-section as it accelerates and a boundary layer of dusty air develops around the core stream of bulk material. Results of air entrainment per unit mass of parent material are also given. The authors describe a simple analytical model of the complex air entrainment process by treating the falling stream of material as a negatively buoyant plume of dusty air fully miscible with the ambient air. The experimental data are successfully correlated using this approach. The plume model provides a more realistic description for the situation considered here than previous theoretical treatments based on air movement induced by isolated particles independently falling through quiescent air. |
| first_indexed | 2024-12-13T16:18:14Z |
| format | Article |
| id | doaj.art-d7d8b0a79f544ffa82ba7ba28685a1db |
| institution | Directory Open Access Journal |
| issn | 0288-4534 2187-5537 |
| language | English |
| last_indexed | 2024-12-13T16:18:14Z |
| publishDate | 2014-05-01 |
| publisher | Hosokawa Powder Technology Foundation |
| record_format | Article |
| series | KONA Powder and Particle Journal |
| spelling | doaj.art-d7d8b0a79f544ffa82ba7ba28685a1db2022-12-21T23:38:47ZengHosokawa Powder Technology FoundationKONA Powder and Particle Journal0288-45342187-55372014-05-0113012513410.14356/kona.1995017konaAir Entrainment and Dust Generation from a Falling Stream of Bulk MaterialPaul Cooper0Peter Arnold1Department of Mechanical Engineering University of WollongongDepartment of Mechanical Engineering University of WollongongBulk materials handling operations involving falling streams of the bulk material are common throughout industry. Proper design of any fugitive dust control system servicing such operations requires knowledge of the behaviour of the free-falling stream in terms of the air entrained by the falling material and the concentration of dust liberated. In this paper results of experiments on alumina powder free-falling from a hopper are presented. It was found that the material stream initially contracts in cross-section as it accelerates and a boundary layer of dusty air develops around the core stream of bulk material. Results of air entrainment per unit mass of parent material are also given. The authors describe a simple analytical model of the complex air entrainment process by treating the falling stream of material as a negatively buoyant plume of dusty air fully miscible with the ambient air. The experimental data are successfully correlated using this approach. The plume model provides a more realistic description for the situation considered here than previous theoretical treatments based on air movement induced by isolated particles independently falling through quiescent air.https://www.jstage.jst.go.jp/article/kona/13/0/13_1995017/_pdf/-char/en |
| spellingShingle | Paul Cooper Peter Arnold Air Entrainment and Dust Generation from a Falling Stream of Bulk Material KONA Powder and Particle Journal |
| title | Air Entrainment and Dust Generation from a Falling Stream of Bulk Material |
| title_full | Air Entrainment and Dust Generation from a Falling Stream of Bulk Material |
| title_fullStr | Air Entrainment and Dust Generation from a Falling Stream of Bulk Material |
| title_full_unstemmed | Air Entrainment and Dust Generation from a Falling Stream of Bulk Material |
| title_short | Air Entrainment and Dust Generation from a Falling Stream of Bulk Material |
| title_sort | air entrainment and dust generation from a falling stream of bulk material |
| url | https://www.jstage.jst.go.jp/article/kona/13/0/13_1995017/_pdf/-char/en |
| work_keys_str_mv | AT paulcooper airentrainmentanddustgenerationfromafallingstreamofbulkmaterial AT peterarnold airentrainmentanddustgenerationfromafallingstreamofbulkmaterial |