Air flow studies in channelled mirrors

Details Air flow studies in channelled mirrors Air flow studies in channelled mirrors

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1236..812f&link_type=abstract

IN: Advanced technology optical telescopes IV; Proceedings of the Meeting, Tucson, AZ, Feb. 12-16, 1990. Part 2 (A91-23201 08-89

Physics

Air Flow, Convective Heat Transfer, Mirrors, Reflecting Telescopes, Surface Temperature, Thermal Expansion, Heat Transmission, Temperature Measurement

Scientific paper

Air flow tests with a 61-cm diameter, 8.9-cm thick mirror have indicated that the circulation of ambient temperature air through the channels at 10 m/sec sufficed to maintain the mirror's front surface below the critical temperatures that would result in good mirror seeing; the effective front-surface thermal time constant for these conditions was 1 hr. An extrapolation of these results to mirrors of greater thickness, without channels, indicated that the use of a heat exchanger to control rear surface air temperature could be as effective as ambient air flow through internal channels, up to mirror thicknesses of about 10 cm.

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