Two-dimensional flow properties of micronozzle under varied isothermal wall conditions

Hameed, Amar Hasan and Kafafy, Raed and Asrar, Waqar and Idres, Moumen (2013) Two-dimensional flow properties of micronozzle under varied isothermal wall conditions. International Journal of Engineering Systems Modelling and Simulation, 5 (4). pp. 174-180. ISSN 1755-9766

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Abstract

A new technology, which uses thermoelectric elements as side-walls of microthrusters for heating and cooling purpose, is emerging. This technique can improve the performance of low-Reynolds-number microthrusters as a result of increasing the flow momentum forces or decreasing the viscous forces. In the present paper, we focus on the effect of using heated or cooled walls to control the properties of the flow through a micronozzle. Viscous compressible laminar flow is solved in the micronozzle. Different isothermal divergent-wall temperatures are tested to study the impact of wall temperature on the fundamental properties of momentum forces. The temperature difference between the wall and the gas effects the static temperature and static pressure profile, Mach number is increased, density near the wall is increased due to cooling. Alleviation of viscous losses by cooling the supersonic flow in the expander is demonstrated by the reduction of the thickness of the subsonic boundary layer

Item Type:	Article (Journal)
Additional Information:	5259/34991
Uncontrolled Keywords:	Low-Reynolds-number; MEMS; Micro nozzle; Micropropulsion; Thermoelectricity; Thermoelement
Subjects:	T Technology > TJ Mechanical engineering and machinery T Technology > TL Motor vehicles. Aeronautics. Astronautics
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering > Department of Mechanical Engineering
Depositing User:	Prof. Waqar Asrar
Date Deposited:	30 Jan 2014 09:17
Last Modified:	30 Jan 2014 09:17
URI:	http://irep.iium.edu.my/id/eprint/34991

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