Thermoelectrically controlled micronozzle - A novel application for thermoelements

This paper introduces and assesses the concept of the recently invented thermoelectrically controlled micronozzle (TECMN). A generalized quasi-one-dimensional model for gas flow, which is influenced by area variation and by wall heat transfer, is considered. In order to assess the merits of wall t...

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Main Authors:	Hameed, Amar Hasan, Kafafy, Raed
Format:	Article
Language:	English
Published:	Springer 2012
Subjects:	TA Engineering (General). Civil engineering (General)
Online Access:	http://irep.iium.edu.my/29303/ http://irep.iium.edu.my/29303/ http://irep.iium.edu.my/29303/1/Thermoelectrically_controlled_micronozzle.pdf

id	iium-29303
recordtype	eprints
spelling	iium-293032013-03-03T23:57:02Z http://irep.iium.edu.my/29303/ Thermoelectrically controlled micronozzle - A novel application for thermoelements Hameed, Amar Hasan Kafafy, Raed TA Engineering (General). Civil engineering (General) This paper introduces and assesses the concept of the recently invented thermoelectrically controlled micronozzle (TECMN). A generalized quasi-one-dimensional model for gas flow, which is influenced by area variation and by wall heat transfer, is considered. In order to assess the merits of wall temperature control in micronozzles, the flow in the micronozzle is solved numerically for cases of convergent wall heating, divergent wall cooling, and a combination of both. Thermal efficiency and specific impulse are affected by heat exchange through the side wall of the micronozzle. By cooling the divergent section, kinetic energy increases, thus improving thermal efficiency. The mass flow rate is decreased in all cases that include convergent section heating, thereby enhancing specific impulse. The combination of convergent section heating with divergent part cooling results in significant performance enhancement in terms of thermal efficiency and specific impulse. To determine the TECMN wall temperature profile, we developed a one-dimensional general energy model for a thermoelement (TE) subject to an electric field as well as for heat convection on the lateral surface. The energy equation is analytically solved for constant properties and for Joule heating equivalent to heat convection. The temperature profile is then imposed on the quasi-one-dimensional flow model, which is solved numerically for various mass flow rates and exit wall temperature (cold junction). As the exit section wall temperature and mass flow rate decrease, the utilization of TEs to control the temperature of micronozzle walls considerably increases the Mach number at exit. Springer 2012 Article PeerReviewed application/pdf en http://irep.iium.edu.my/29303/1/Thermoelectrically_controlled_micronozzle.pdf Hameed, Amar Hasan and Kafafy, Raed (2012) Thermoelectrically controlled micronozzle - A novel application for thermoelements. Journal of Mechanical Science and Technology, 26 (11). pp. 3631-3641. ISSN 1976-3824 (O), 1738-494X (P) 10.1007/s12206-012-0847-z
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English
topic	TA Engineering (General). Civil engineering (General)
spellingShingle	TA Engineering (General). Civil engineering (General) Hameed, Amar Hasan Kafafy, Raed Thermoelectrically controlled micronozzle - A novel application for thermoelements
description	This paper introduces and assesses the concept of the recently invented thermoelectrically controlled micronozzle (TECMN). A generalized quasi-one-dimensional model for gas flow, which is influenced by area variation and by wall heat transfer, is considered. In order to assess the merits of wall temperature control in micronozzles, the flow in the micronozzle is solved numerically for cases of convergent wall heating, divergent wall cooling, and a combination of both. Thermal efficiency and specific impulse are affected by heat exchange through the side wall of the micronozzle. By cooling the divergent section, kinetic energy increases, thus improving thermal efficiency. The mass flow rate is decreased in all cases that include convergent section heating, thereby enhancing specific impulse. The combination of convergent section heating with divergent part cooling results in significant performance enhancement in terms of thermal efficiency and specific impulse. To determine the TECMN wall temperature profile, we developed a one-dimensional general energy model for a thermoelement (TE) subject to an electric field as well as for heat convection on the lateral surface. The energy equation is analytically solved for constant properties and for Joule heating equivalent to heat convection. The temperature profile is then imposed on the quasi-one-dimensional flow model, which is solved numerically for various mass flow rates and exit wall temperature (cold junction). As the exit section wall temperature and mass flow rate decrease, the utilization of TEs to control the temperature of micronozzle walls considerably increases the Mach number at exit.
format	Article
author	Hameed, Amar Hasan Kafafy, Raed
author_facet	Hameed, Amar Hasan Kafafy, Raed
author_sort	Hameed, Amar Hasan
title	Thermoelectrically controlled micronozzle - A novel application for thermoelements
title_short	Thermoelectrically controlled micronozzle - A novel application for thermoelements
title_full	Thermoelectrically controlled micronozzle - A novel application for thermoelements
title_fullStr	Thermoelectrically controlled micronozzle - A novel application for thermoelements
title_full_unstemmed	Thermoelectrically controlled micronozzle - A novel application for thermoelements
title_sort	thermoelectrically controlled micronozzle - a novel application for thermoelements
publisher	Springer
publishDate	2012
url	http://irep.iium.edu.my/29303/ http://irep.iium.edu.my/29303/ http://irep.iium.edu.my/29303/1/Thermoelectrically_controlled_micronozzle.pdf
first_indexed	2023-09-18T20:43:00Z
last_indexed	2023-09-18T20:43:00Z
_version_	1777409489990844416

Thermoelectrically controlled micronozzle - A novel application for thermoelements

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