Role of Vortical Structures on the Forced Convective Heat Transfer in Oscillation-Controlled Coaxial-Pipe Heat Exchanger

Takagi, Daisuke; Takeuchi, Shintaro; Kajishima, Takeo

Journal of Enhanced Heat Transfer, 2015, 22(5), 365-389

Number of Access:816（2025-09-30 11:13 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/57201

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Title
Role of Vortical Structures on the Forced Convective Heat Transfer in Oscillation-Controlled Coaxial-Pipe Heat Exchanger
Creator
CreatorName
Takagi, Daisuke
NRID
1000050372628 1000050372628
ORCID
0000-0003-0091-4542 0000-0003-0091-4542
researchmap permalink
50372628 50372628
Scopus Author ID
35474283000 35474283000
CreatorName
Takeuchi, Shintaro
NRID
1000030185772 1000030185772
CreatorName
Kajishima, Takeo
Subject
Active technique
Single-phase flow convection
Double-pipe heat exchanger
Computational modelling
Description
This is a pre-copyedited, author-produced PDF of an article accepted for publication in Journal of Enhanced Heat Transfer following peer review.
Abstract
A numerical simulation of an oscillation-controlled heat-transport coaxial pipe is carried out for studying the flow structure and heat transport characteristics. The heat-transport pipe connects the hot and cold reservoirs, and the cold and hot fluids are discharged with the anti-phase reciprocal waves through circular and annular openings at the ends of the chamber, respectively. By changing the diameter ratio of the circular opening to the inner tube, a unidirectionally circulating flow is observed to develop spontaneously. The flow rate of the unidirectional current is found to be approximately inversely-proportional to the diameter ratio. While the amount of transported heat increases with the flow rate of the unidirectional current (especially when generating strong vortices at the edge of the inner tube) for both cases of thermally-insulated and fully-conductive inner wall, the optimal heat transport performance is attained (not in association with the strongest unidirectional flow) when making zero-averaged vorticity in the cold-end region. For the case of the conductive inner wall, the heat loss across the wall is suppressed with decreasing the diameter ratio, due to the development of the strong jet and radially surrounding shear layer that separate the outer hot fluid from the inner cold fluid.
Publisher
Begellhouse
Source Title
Journal of Enhanced Heat Transfer
Volume (Issue)
22(5)
Page
365-389
Date of Issued
2015
Language
English
Handle URL
https://hdl.handle.net/11094/57201
PISSN
10655131
eISSN
15635074
NCID
AA11040782
Relation.isVersionOf
DOI (Publisher Version)
https://doi.org/10.1615/jenhheattransf.2016015399
Access Rights
open access
oaire:version
Accepted Manuscript
Category
学術雑誌論文 Journal Article