Article (Scientific journals)
Thermal rectifier efficiency of various bulk-nanoporous silicon devices
Machrafi, Hatim; Lebon, Georgy; Jou, D.
2016In International Journal of Heat and Mass Transfer, 97, p. 603-610
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Keywords :
Bulk-nanoporous silicon; Homogeneous and non-homogeneous systems; Phononics; Thermal rectifiers; Efficiency; Pore size; Porosity; Silicon; Bulk system; Nano-porous silicon; Non-homogeneous; Porosity and pore size; Porous configuration; Thermal coefficients; Variable porosity; Porous silicon
Abstract :
[en] Our objective is to calculate and to compare the rectifying thermal coefficient of various bulk-porous silicon configurations. We consider successively homogeneous devices involving two- and three elements and several graded devices characterized by variable porosity and/or size of the pores along the system. The criterion is to obtain rectifying coefficients different from one in order that thermal rectification be as efficient as possible. In that respect, it turns out that the porous-bulk-porous configurations are of little interest, in contrast to the bulk-porous-bulk systems whose rectifying coefficients may be larger than two and comparable to the values of the simpler two-element bulk-porous devices. Graded systems with either a variable porosity or a variable pore size do not exhibit better results. However, when both porosity and pore size are varying along the device, the highest efficiency is obtained. © 2016 Elsevier Ltd. All rights reserved.
Disciplines :
Physics
Author, co-author :
Machrafi, Hatim ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Thermodynamique des phénomènes irréversibles
Lebon, Georgy ;  Université de Liège - ULiège > Relations académiques et scientifiques (Sciences)
Jou, D.;  Departament de Física, Universitat Autònoma de Barcelona, Bellaterra, Catalonia, Spain
Language :
English
Title :
Thermal rectifier efficiency of various bulk-nanoporous silicon devices
Publication date :
2016
Journal title :
International Journal of Heat and Mass Transfer
ISSN :
0017-9310
eISSN :
1879-2189
Publisher :
Elsevier Ltd
Volume :
97
Pages :
603-610
Peer reviewed :
Peer Reviewed verified by ORBi
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since 19 November 2017

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