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Abstract of "HIGH TEMPERATURE HEAT EXCHANGERS AND MICROSCALE COMBUSTION SYSTEMS: APPLICATIONS TO THERMAL SYSTEM MINIATURIZATION"

DOI: 10.1615/ICHMT.2000.TherSieProcVol2.80
72 pages

Michael M. Ohadi
Small and Smart Thermal Systems Laboratory, Center for Energy Environmental Engineering, Department of Mechanical Engineering, University of Maryland, College Park, Maryland 20742, USA

Steven G. Buckley
Center for Energy Environmental Engineering, Department of Mechanical Engineering, University of Maryland, College Park, Maryland 20742, USA

Abstract

The objective of traditional research and development on heat exchangers has been to improve the performance and/or reduce the size and cost of the heat exchanger. Traditional research in power conversion has focused primarily on efficiency issues. However, rapidly developing applications in high temperature power and propulsion, pollution control/heat recovery, and high density power electronics has introduced new opportunities and challenges in developing cost- effective high performance, high temperature heat exchangers and microscale power systems. In this article the focus is placed on high temperature heat exchangers for power/ propulsion and thermal incineration/heat recovery applications, and on enabling technologies for microscale combustion systems. First a brief review of the growing need for high temperature heat exchangers and microscale combustors and the state of the art materials and fabrication technologies is presented. Next, various heat transfer augmentation techniques and their potential applicability to performance enhancement of high temperature heat exchangers are discussed. Selected results of a case study involving a carbon fiber heat exchanger enhanced with an active heat transfer augmentation technique are presented. Issues associated with microscale combustion systems are presented, and technology enabling their development, namely, catalytic combustion and EHD reaction rate augmentation techniques are discussed.

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