Flow reversals in particle-dispersed natural convection in a two-dimensional enclosed square domain

Takeuchi, Shintaro; Miyamori, Yuri; Gu, Jingchen et al.

Physical Review Fluids, 2019, 4(8), 84304

Number of Access:853（2025-09-30 11:13 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/73149

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Title
Flow reversals in particle-dispersed natural convection in a two-dimensional enclosed square domain
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
Miyamori, Yuri
CreatorName
Gu, Jingchen
NRID
1000030185772 1000030185772
CreatorName
Kajishima, Takeo
Description
Shintaro Takeuchi, Yuri Miyamori, Jingchen Gu, and Takeo Kajishima, "Flow reversals in particle-dispersed natural convection in a two-dimensional enclosed square domain," Physical Review Fluids, 4, 084304, 2019. https://doi.org/10.1103/PhysRevFluids.4.084304.
動画は論文出版後に追加したものである。 / The video was added after the paper was published.
Abstract
Flow reversals in natural convection of particle-dispersed two-phase flow in a two-dimensional square box are studied by numerical simulation. The Rayleigh number based on the domain side length is set to 10^4. The domain accommodates 11^2 neutrally buoyant circular particles, and the thermal conductivity of the particle is set to 10^2 times higher than the ambient fluid. The particle-dispersed flow driven by buoyancy develops into circulating flow, which transports particles into a diagonal pair of corner regions of the domain. The particles vertically aligned in the corner regions are a strong source of moment of buoyancy in the counterconvective direction, and flow reversals take place at the intervals of several hundred convective-time scales. The mechanism is different from that of the reversals or oscillation in single-phase or particle-dispersed natural convection reported in the literature. Thermal effect of the vertically aligned particles in a corner is modeled by nondimensionalized heat flux, and a cross-coupled sum of those of the four corners is found to be a precursor indicator of the reversal events. The investigation on the effects of three major parameters (Rayleigh number, conductivity ratio, and average interparticle spacing) suggests that the reversals occur in a small region in the parameter space.
Publisher
American Physical Society
Source Title
Physical Review Fluids
Volume (Issue)
4(8)
Page
84304
Date of Issued
2019-08-21
Language
English
Handle URL
https://hdl.handle.net/11094/73149
eISSN
2469990X
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.1103/physrevfluids.4.084304
Access Rights
open access
CopyRight
©2019 American Physical Society
oaire:version
Version of Record
Category
学術雑誌論文 Journal Article