Heat transfer in natural convection with finite-sized particles considering thermal conductance due to inter­particle contacts

Takeuchi, Shintaro; Tsutsumi, Takaaki; Kajishima, Takeo et al.

Computational Thermal Sciences, 2015, 7(5, 6), 385-404

Number of Access:981（2025-08-15 06:46 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/57199

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Title
Heat transfer in natural convection with finite-sized particles considering thermal conductance due to inter­particle contacts
Creator
NRID
1000050372628 1000050372628
ORCID
0000-0003-0091-4542 0000-0003-0091-4542
researchmap permalink
50372628 50372628
Scopus Author ID
35474283000 35474283000
CreatorName
Takeuchi, Shintaro
CreatorName
Tsutsumi, Takaaki
NRID
1000030185772 1000030185772
CreatorName
Kajishima, Takeo
CreatorName
Kondo, Katsuya
CreatorName
Harada, Takeshi
Subject
Multiphase flow
Solid-dispersion
Immersed solid object
Heat transfer
Thermal contact conduction
Description
This is a pre-copyedited, author-produced PDF of an article accepted for publication in Computational Thermal Sciences following peer review.
Abstract
Heat transfer problem in solid-dispersed two-phase flow is numerically studied. Temperature gradient within the finite-sized particles and inter-particle heat flux due to collisions are considered, and those effects on the flow structure and heat transfer are discussed. The interaction between fluid and particles is treated by our original immersed solid approach For the conjugate heat transfer problems, to satisfy the thermal condition at the fluid-solid interface, our interfacial heat flux model is employed. Also, the interfacial flux model is extended to incorporate the heat conduction due to inter-particle contacts, based on 2-D and axisymmetric contact heat resistance solutions. The method is applied to 2-D and 3-D natural convection problems including multiple particles in a confined domain under relatively low Rayleigh numbers (10^4 ∼ 10^6). Heat transfer and particle behaviours are studied for different solid volume fractions (up to about 50%) and heat conductivity ratios (solid to fluid) ranging between 10^−3 and 10^3. Under high solid volume fraction conditions, the particles are observed to form densely concentrated regions, where heat flow tends to channel through the contacting points. In three-dimensional solid-dispersed flows, by decomposing the heat flux into the contributions of the convection and conduction, the change of the major heat transfer mode is studied for different solid volume fractions and conductivity ratios.
Publisher
Begellhouse
Source Title
Computational Thermal Sciences
Volume (Issue)
7(5, 6)
Page
385-404
Date of Issued
2015
Language
English
Handle URL
https://hdl.handle.net/11094/57199
PISSN
19402503
eISSN
19402554
NCID
AA12428816
Relation.isVersionOf
DOI (Publisher Version)
https://doi.org/10.1615/computthermalscien.2016014791
Access Rights
open access
oaire:version
Accepted Manuscript
Category
学術雑誌論文 Journal Article