An investigation of surficial conduction heat loss in perfectly aligned micro-wire array

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Recently, geometrical effects in micro-/nanomaterials have gained great attention of researchers in diverse scientific and engineering fields because unique physical properties can be achieved not only by the micro-/nanosize effects of materials but also by adjustment of the geometrical parameters. In this work, we investigated heat-transfer in a perfectly aligned microwire array structure. When the structure has a very narrow gap (g) between the wires, which is less than twice the mean free path of an ambient medium (g < 2 lambda medium), there is a significant suppression of conduction heat-loss due to the reduction of the "molecular diffusion," resulting in the improved power-efficiency in joule-heating characteristics. To clearly understand the suppressed conduction heat-loss with regard to the gap reduction, we performed analytical calculation and finite-element-method (FEM) simulation. To experimentally investigate the phenomenon, we develop a setup that is a combination of a microstructure having various gaps and an air-pressure controllable chamber. Through the experiment, we verified that a remarkable improvement of joule-heating operation can be achieved with the structure having very small gaps (g < 2 lambda medium) due to the suppression of conduction heat-loss.
Publisher
AMER INST PHYSICS
Issue Date
2019-09
Language
English
Article Type
Article
Citation

APPLIED PHYSICS LETTERS, v.115, no.13

ISSN
0003-6951
DOI
10.1063/1.5123523
URI
http://hdl.handle.net/10203/267982
Appears in Collection
EE-Journal Papers(저널논문)
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