Modeling of non-uniform thermoelement devices subject to lateral heat convection
In this paper, we draw attention to the importance of the lateral convection heat transfer effect on the operation of thermoelements with variable cross-sectional area. The significance of lateral heat convection arises from a new application, in which thermoelements form the walls of a MEMS-based...
Saved in:
Main Authors: | , |
---|---|
Format: | Article |
Language: | English |
Published: |
Scitec Publications Ltd.
2011
|
Subjects: | |
Online Access: | http://irep.iium.edu.my/4270/1/DDF.312-315.782.pdf http://irep.iium.edu.my/4270/ http://www.ttp.net/1012-0386.html |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
id |
my.iium.irep.4270 |
---|---|
record_format |
dspace |
spelling |
my.iium.irep.42702013-07-03T04:45:33Z http://irep.iium.edu.my/4270/ Modeling of non-uniform thermoelement devices subject to lateral heat convection Kafafy, Raed Hameed, Ammar TJ Mechanical engineering and machinery TL Motor vehicles. Aeronautics. Astronautics In this paper, we draw attention to the importance of the lateral convection heat transfer effect on the operation of thermoelements with variable cross-sectional area. The significance of lateral heat convection arises from a new application, in which thermoelements form the walls of a MEMS-based convergent-divergent micronozzle in order to pump heat from the divergent part of the micronozzle to the convergent part to enhance overall performance. To assess the effect of thermoelement, we develop a quasi-one-dimensional model for thermoelements, in which, the physical phenomena of Peltier effect, Joule heating, Seebeck effect, longitudinal heat conduction, and lateral heat convection are considered. The general energy equation of the thermoelement with variable material properties is formulated with heat convection modeled as a lateral heat source. We used the model to study thermoelements with rectangular cross section and uniform thickness, but variable width. The width of the element is maximum at the location forming the micronozzle throat. Several geometries have been investigated; a piece-wise linear, parabolic and piece-wise sine wave. Two parameters which play important role in the thermal performance of thermoelement are identified. These are the thermal resistance ratio; ratio of longitudinal conduction resistance to lateral convection resistance, and heating ratio; ratio of Joule heating to Fourier conducted heat. The effects of varying these two parameters as well as thermoelement geometry have been investigated thoroughly and the results are presented in the form of charts to assist the design and material selection of the thermoelement. Scitec Publications Ltd. 2011-04 Article REM application/pdf en http://irep.iium.edu.my/4270/1/DDF.312-315.782.pdf Kafafy, Raed and Hameed, Ammar (2011) Modeling of non-uniform thermoelement devices subject to lateral heat convection. Defect and Diffusion Forum, 312. pp. 782-787. ISSN 1012-0386 http://www.ttp.net/1012-0386.html doi:10.4028/www.scientific.net/DDF.312-315.782 |
institution |
Universiti Islam Antarabangsa Malaysia |
building |
IIUM Library |
collection |
Institutional Repository |
continent |
Asia |
country |
Malaysia |
content_provider |
International Islamic University Malaysia |
content_source |
IIUM Repository (IREP) |
url_provider |
http://irep.iium.edu.my/ |
language |
English |
topic |
TJ Mechanical engineering and machinery TL Motor vehicles. Aeronautics. Astronautics |
spellingShingle |
TJ Mechanical engineering and machinery TL Motor vehicles. Aeronautics. Astronautics Kafafy, Raed Hameed, Ammar Modeling of non-uniform thermoelement devices subject to lateral heat convection |
description |
In this paper, we draw attention to the importance of the lateral convection heat transfer effect on the operation of thermoelements with variable cross-sectional area. The significance of lateral heat convection arises from a new application, in which thermoelements form the walls of a
MEMS-based convergent-divergent micronozzle in order to pump heat from the divergent part of the micronozzle to the convergent part to enhance overall performance. To assess the effect of thermoelement, we develop a quasi-one-dimensional model for thermoelements, in which, the
physical phenomena of Peltier effect, Joule heating, Seebeck effect, longitudinal heat conduction, and lateral heat convection are considered. The general energy equation of the thermoelement with variable material properties is formulated with heat convection modeled as a lateral heat source. We used the model to study thermoelements with rectangular cross section and uniform thickness, but
variable width. The width of the element is maximum at the location forming the micronozzle throat. Several geometries have been investigated; a piece-wise linear, parabolic and piece-wise sine wave. Two parameters which play important role in the thermal performance of thermoelement are
identified. These are the thermal resistance ratio; ratio of longitudinal conduction resistance to lateral convection resistance, and heating ratio; ratio of Joule heating to Fourier conducted heat. The effects of varying these two parameters as well as thermoelement geometry have been investigated thoroughly and the results are presented in the form of charts to assist the design and material
selection of the thermoelement. |
format |
Article |
author |
Kafafy, Raed Hameed, Ammar |
author_facet |
Kafafy, Raed Hameed, Ammar |
author_sort |
Kafafy, Raed |
title |
Modeling of non-uniform thermoelement devices subject to lateral heat convection |
title_short |
Modeling of non-uniform thermoelement devices subject to lateral heat convection |
title_full |
Modeling of non-uniform thermoelement devices subject to lateral heat convection |
title_fullStr |
Modeling of non-uniform thermoelement devices subject to lateral heat convection |
title_full_unstemmed |
Modeling of non-uniform thermoelement devices subject to lateral heat convection |
title_sort |
modeling of non-uniform thermoelement devices subject to lateral heat convection |
publisher |
Scitec Publications Ltd. |
publishDate |
2011 |
url |
http://irep.iium.edu.my/4270/1/DDF.312-315.782.pdf http://irep.iium.edu.my/4270/ http://www.ttp.net/1012-0386.html |
_version_ |
1643605309405528064 |
score |
13.18916 |