Heat transfer and particle behaviours in dispersed two-phase flow with different heat conductivities for liquid and solid

Tsutsumi, Takaaki; Takeuchi, Shintaro; Kajishima, Takeo

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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
内容	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
ISSN	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

著者版フラグ	author
NII資源タイプ	学術雑誌論文
ローカル資源タイプ	学術雑誌論文
dcmi資源タイプ	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
DC.description	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
citation_issn	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

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