ようこそ ゲスト さん
雑誌ブラウズ
雑誌 全て
大阪大学 刊行物
ランキング
アクセスランキング
ダウンロードランキング
博士論文のみをさがす
このアイテムのアクセス数:
37
件
(
2021-01-23
14:48 集計
)
このアイテムへのリンクには次のURLをご利用ください:http://hdl.handle.net/11094/26599
閲覧可能ファイル
ファイル
フォーマット
サイズ
閲覧回数
説明
jwri42_01-001
pdf
579 KB
51
論文情報
タイトル
Influence of Particle Charging on the Fume Formation Process in Arc Welding
著者
Tashiro, Shinichi
Tashiro, Shinichi
Murphy, B. Anthony
Murphy, B. Anthony
Tanaka, Manabu
Tanaka, Manabu
キーワード等
Fume
Arc welding
Charging
Simulation
抄録
In order to clarify the influence of electrostatic forces caused by charging of particles on the coagulation process in fume formation in arc welding, a previously-developed fume formation model has been modified to consider the influence of charging, for both local thermodynamic equilibrium (LTE) and non-LTE conditions. The model takes into account formation of the particles from metal vapour by nucleation, growth of the particles by condensation of metal vapour, and coagulation of the particles by collisions to form secondary particles. Results have been obtained for both ballistic and Brownian motion of the particles. It was found that the growth of secondary particles is suppressed when the average particle charge becomes significant, because charging of the particle hinders collisions among secondary particles through the strong repulsive electrostatic force. Furthermore, deviations from LTE strongly affect the coagulation process, because the increased electron density at a given gas temperature increases the charging of particles. Brownian motion leads to larger secondary particles, since the average particle speed is increased. The influence of Brownian motion and particle charging cancel each other to a large extent, particularly when deviations from LTE are considered.
公開者
大阪大学接合科学研究所
公開者の別表記
Joining and Welding Research Institute, Osaka University
公開者 (ヨミ)
オオサカ ダイガク セツゴウ カガク ケンキュウジョ
掲載誌名
Transactions of JWRI
巻
42
号
1
開始ページ
1
終了ページ
9
刊行年月
2013-06
ISSN
03874508
NCID
AA00867058
URL
http://hdl.handle.net/11094/26599
言語
英語
カテゴリ
紀要論文 Departmental Bulletin Paper
Transactions of JWRI / Vol.42 No.1 (2013-06)
論文詳細を表示
著者版フラグ
publisher
NII資源タイプ
紀要論文
ローカル資源タイプ
紀要論文
dcmi資源タイプ
text
DCTERMS.bibliographicCitation
Transactions of JWRI.42(1) P.1-P.9
DC.title
Influence of Particle Charging on the Fume Formation Process in Arc Welding
DC.creator
Tashiro, Shinichi
Murphy, B. Anthony
Tanaka, Manabu
DC.publisher
大阪大学接合科学研究所
DC.language" scheme="DCTERMS.RFC1766
英語
DCTERMS.issued" scheme="DCTERMS.W3CDTF
2013-06
DC.identifier" scheme="DCTERMS.URI
http://hdl.handle.net/11094/26599
DC.subject
Fume
Arc welding
Charging
Simulation
DCTERMS.abstract
In order to clarify the influence of electrostatic forces caused by charging of particles on the coagulation process in fume formation in arc welding, a previously-developed fume formation model has been modified to consider the influence of charging, for both local thermodynamic equilibrium (LTE) and non-LTE conditions. The model takes into account formation of the particles from metal vapour by nucleation, growth of the particles by condensation of metal vapour, and coagulation of the particles by collisions to form secondary particles. Results have been obtained for both ballistic and Brownian motion of the particles. It was found that the growth of secondary particles is suppressed when the average particle charge becomes significant, because charging of the particle hinders collisions among secondary particles through the strong repulsive electrostatic force. Furthermore, deviations from LTE strongly affect the coagulation process, because the increased electron density at a given gas temperature increases the charging of particles. Brownian motion leads to larger secondary particles, since the average particle speed is increased. The influence of Brownian motion and particle charging cancel each other to a large extent, particularly when deviations from LTE are considered.
citation_title
Influence of Particle Charging on the Fume Formation Process in Arc Welding
citation_author
Tashiro, Shinichi
Murphy, B. Anthony
Tanaka, Manabu
citation_publisher
大阪大学接合科学研究所
citation_language
英語
citation_date
2013-06
citation_journal_title
Transactions of JWRI
citation_volume
42
citation_issue
1
citation_firstpage
1
citation_lastpage
9
citation_issn
03874508
citation_public_url
http://hdl.handle.net/11094/26599
citation_keywords
Fume
Arc welding
Charging
Simulation