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2018-03-19
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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/11094/57202
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FTC_92_12_103
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論文情報
タイトル
Heat transfer and particle behaviours in dispersed two-phase flow with different heat conductivities for liquid and solid
著者
Tsutsumi, Takaaki
Tsutsumi, Takaaki
Takeuchi, Shintaro
Takeuchi, Shintaro
Kajishima, Takeo
Kajishima, Takeo
キーワード等
Multiphase flow
Solid dispersion
Immersed solid object
Conjugate heat transfer
Heat conductivity ratio
内容
Tsutsumi, T et al. Flow Turbulence Combust (2014) 92: 103. doi:10.1007/s10494-013-9498-0
The final publication is available at Springer via http://dx.doi.org/10.1007/s10494-013-9498-0.
抄録
Liquid-solid two-phase flow with heat transfer is directly simulated, to investigate the effects of the ratios of heat conductivities (solid to liquid) and bulk solid volume fraction from dense to dilute situations. The interaction between fluid and particles is solved by our original immersed solid approach on a rectangular grid system. A discrete element method with a soft-sphere collision model is applied for particle-particle and particle-wall interactions. Governing equation of temperature is time-updated with an implicit treatment for the diffusion term, which enables robust simulation with particles of very high/low ratios of heat conductivities (from 1/1000 to 1000) to the fluid. The local heat flux at the fluid-solid interface is modelled by a new flux decomposition technique, and incorporated into the implicit scheme of the temperature. The method is applied to a 2-D particulate flow in a natural convection in a square domain at a relatively low Rayleigh number. In the dense condition, for the cases with high ratios of heat conductivity, the heat transfer is promoted by strong convection, while the particles of low ratios of heat conductivity tend to hinder the development of the temperature rise in the flow field, causing a weak convection and low Nusselt number. Under a condition of relatively low solid volume fraction, fixed particles only depress the heat convection as the number of particles and heat conductivity ratio increase. For the cases with freely-moving particles, on the other hand, heat conductivity of particles has a stronger influence on the heat transfer of the system than the number of particles. The above simulation results highlight the effect of temperature distributions within the particles and liquid.
公開者
Springer Netherlands in association with ERCOFTAC
掲載誌名
Flow, Turbulence and Combustion
巻
92
号
1, 2
開始ページ
103
終了ページ
119
刊行年月
2014-01
ISSN
13866184
15731987
NCID
AA11319393
URL
http://hdl.handle.net/11094/57202
関連情報 (references)
http://dx.doi.org/10.1007/s10494-013-9498-0
言語
英語
論文詳細を表示
著者版フラグ
author
NII資源タイプ
学術雑誌論文
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学術雑誌論文
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text
DCTERMS.bibliographicCitation
Flow, Turbulence and Combustion.92(1, 2) P.103-P.119
DC.title
Heat transfer and particle behaviours in dispersed two-phase flow with different heat conductivities for liquid and solid
DC.creator
Tsutsumi, Takaaki
Takeuchi, Shintaro
Kajishima, Takeo
DC.publisher
Springer Netherlands in association with ERCOFTAC
DC.language" scheme="DCTERMS.RFC1766
英語
DCTERMS.issued" scheme="DCTERMS.W3CDTF
2014-01
DC.identifier" scheme="DCTERMS.URI
http://hdl.handle.net/11094/57202
DC.subject
Multiphase flow
Solid dispersion
Immersed solid object
Conjugate heat transfer
Heat conductivity ratio
DC.description
Tsutsumi, T et al. Flow Turbulence Combust (2014) 92: 103. doi:10.1007/s10494-013-9498-0
The final publication is available at Springer via http://dx.doi.org/10.1007/s10494-013-9498-0.
DCTERMS.abstract
Liquid-solid two-phase flow with heat transfer is directly simulated, to investigate the effects of the ratios of heat conductivities (solid to liquid) and bulk solid volume fraction from dense to dilute situations. The interaction between fluid and particles is solved by our original immersed solid approach on a rectangular grid system. A discrete element method with a soft-sphere collision model is applied for particle-particle and particle-wall interactions. Governing equation of temperature is time-updated with an implicit treatment for the diffusion term, which enables robust simulation with particles of very high/low ratios of heat conductivities (from 1/1000 to 1000) to the fluid. The local heat flux at the fluid-solid interface is modelled by a new flux decomposition technique, and incorporated into the implicit scheme of the temperature. The method is applied to a 2-D particulate flow in a natural convection in a square domain at a relatively low Rayleigh number. In the dense condition, for the cases with high ratios of heat conductivity, the heat transfer is promoted by strong convection, while the particles of low ratios of heat conductivity tend to hinder the development of the temperature rise in the flow field, causing a weak convection and low Nusselt number. Under a condition of relatively low solid volume fraction, fixed particles only depress the heat convection as the number of particles and heat conductivity ratio increase. For the cases with freely-moving particles, on the other hand, heat conductivity of particles has a stronger influence on the heat transfer of the system than the number of particles. The above simulation results highlight the effect of temperature distributions within the particles and liquid.
citation_title
Heat transfer and particle behaviours in dispersed two-phase flow with different heat conductivities for liquid and solid
citation_author
Tsutsumi, Takaaki
Takeuchi, Shintaro
Kajishima, Takeo
citation_publisher
Springer Netherlands in association with ERCOFTAC
citation_language
英語
citation_date
2014-01
citation_journal_title
Flow, Turbulence and Combustion
citation_volume
92
citation_issue
1, 2
citation_firstpage
103
citation_lastpage
119
citation_issn
13866184
15731987
citation_public_url
http://hdl.handle.net/11094/57202
citation_keywords
Multiphase flow
Solid dispersion
Immersed solid object
Conjugate heat transfer
Heat conductivity ratio