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...

Full description

Bibliographic Details
Main Authors:	Kafafy, Raed, Hameed, Ammar
Format:	Article
Language:	English
Published:	Scitec Publications Ltd. 2011
Subjects:	TJ Mechanical engineering and machinery TL Motor vehicles. Aeronautics. Astronautics
Online Access:	http://irep.iium.edu.my/4270/ http://irep.iium.edu.my/4270/ http://irep.iium.edu.my/4270/ http://irep.iium.edu.my/4270/1/DDF.312-315.782.pdf

id	iium-4270
recordtype	eprints
spelling	iium-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 PeerReviewed 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
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
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/ http://irep.iium.edu.my/4270/ http://irep.iium.edu.my/4270/ http://irep.iium.edu.my/4270/1/DDF.312-315.782.pdf
first_indexed	2023-09-18T20:12:26Z
last_indexed	2023-09-18T20:12:26Z
_version_	1777407567447719936

Modeling of non-uniform thermoelement devices subject to lateral heat convection

Similar Items