This publication describes the development of a new microstructure to transfer high heat fluxes. With a simple mathematical model based on heat conduction theory for the heat transfer in a micro channel at laminar flow conditions it was deduced that for the transmission of high heat fluxes only the initial part at the beginning of the micro channels is of importance, i.e. the micro channels should be short. Based on this principle a micro structure was designed with a large number of short micro channels taken in parallel. With this newly developed microstructure a prototype of a micro heat exchanger and a surface micro cooler was manufactured and tested. Using the prototype of the micro heat exchanger, manufactured of plastic, heat fluxes up to 500 W/cm2 were achieved at a pressure loss of 0.16 MPa and a mass flow of the water of 200 kg/h per passage. Due to the use of materials with a higher temperature resistance and higher stability like aluminum or ceramic, higher water throughputs and higher flow velocities could be realized in the micro channels. Thus it was possible to increase the heat flux up to approx. 800 W/cm2 at a pressure loss of approx. 0.35 MPa and a mass flow of 350 kg/h per passage. The important focus of investigation of the surface micro cooler was set on the examination of the surface temperatures for different heat fluxes and different velocities of the water in the micro channels. The experimental results of these surface micro coolers are summarized to characteristic maps. With this characteristic maps it is possible to determine whether a micro surface cooler can be used for a specific application.
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ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels
June 23–25, 2008
Darmstadt, Germany
Conference Sponsors:
- Nanotechnology Institute
ISBN:
0-7918-4834-5
PROCEEDINGS PAPER
Micro Heat Changers and Surface-Micro-Coolers for High Heat Flux Available to Purchase
Ulrich Schygulla,
Ulrich Schygulla
Forschungszentrum Karlsruhe GmbH, Karlsruhe, Germany
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Ju¨rgen J. Brandner,
Ju¨rgen J. Brandner
Forschungszentrum Karlsruhe GmbH, Karlsruhe, Germany
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Eugen Anurjew,
Eugen Anurjew
Forschungszentrum Karlsruhe GmbH, Karlsruhe, Germany
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Edgar Hansjosten,
Edgar Hansjosten
Forschungszentrum Karlsruhe GmbH, Karlsruhe, Germany
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Klaus Schubert
Klaus Schubert
Forschungszentrum Karlsruhe GmbH, Karlsruhe, Germany
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Ulrich Schygulla
Forschungszentrum Karlsruhe GmbH, Karlsruhe, Germany
Ju¨rgen J. Brandner
Forschungszentrum Karlsruhe GmbH, Karlsruhe, Germany
Eugen Anurjew
Forschungszentrum Karlsruhe GmbH, Karlsruhe, Germany
Edgar Hansjosten
Forschungszentrum Karlsruhe GmbH, Karlsruhe, Germany
Klaus Schubert
Forschungszentrum Karlsruhe GmbH, Karlsruhe, Germany
Paper No:
ICNMM2008-62188, pp. 1347-1355; 9 pages
Published Online:
June 11, 2009
Citation
Schygulla, U, Brandner, JJ, Anurjew, E, Hansjosten, E, & Schubert, K. "Micro Heat Changers and Surface-Micro-Coolers for High Heat Flux." Proceedings of the ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels. ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels. Darmstadt, Germany. June 23–25, 2008. pp. 1347-1355. ASME. https://doi.org/10.1115/ICNMM2008-62188
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