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ISSN Online: 2377-424X

ISBN Print: 0-85295-345-3

International Heat Transfer Conference 10
August, 14-18, 1994, Brighton, UK

COMPARISON OF EXPERIMENTAL AND COMPUTED PERFORMANCE OF MICRO HEAT EXCHANGERS IN THE RANGES OF LHE AND LN2 TEMPERATURES

Get access (open in a dialog) DOI: 10.1615/IHTC10.2180
pages 441-445

Abstract

Recent investigations show growing interest in new micro heat exchanger structures for cryocooler application. Micro structures with parallel channels are for instance thought having advantages in regenerator application for stirling cycle and pulse tube refrigerators as outlined by Radebaugh (1992) and Colgate (1986). The micro machining method developed at KfK and described by Schubert et al. (1989) has made it possible to manufacture most compact micro heat exchangers which are built up as cross flow apparatusses. To investigate the heat transfer behaviour at LHe temperatures two of these heat exchangers have been manufactured, one from stainless steel (SS), one from copper (Cu). An existing experimental set up has been used and data were taken at temperatures from 1.8 K to 10 K. The experimental data are compared to results computed with a cell modell. Additionally, the code has been applied to operation with liquid and cold nitrogen gas.