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Início Arquivos Thermal Letter Representantes Futuras reuniões Assembléia das Conferências Internacionais de Transferência de Calor
International Heat Transfer Conference 4

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

FLUID THERMAL DIFFUSIVITY DETERMINATION BY A PULSE TRANSIENT TEMPERATURE TECHNIQUE

Lewis Battist
Department of Nuclear Science and Engineering, The Catholic University of America, Washington, D.C.

Frank Goldner
Department of Nuclear Science and Engineering, The Catholic University of America, Washington, D.C.

Neil E. Todreas
Department of Nuclear Engineering and Department of Mechanical Engineering, MIT 77 Massachusetts Avenue, Cambridge Massachusetts 02139, USA

DOI: 10.1615/IHTC4.3260
pages 1-11

Resumo

A new transient method has been developed for the measurement of fluid thermal diffusivity in which: the fluid boundaries do not affect the measurement, bulk fluid temperature is not altered, discrimination between conduction and radiation is achieved, and only 1 cc of liquid is used. The system employs a pulsed laser coupled to a microscope to deposit energy in a local region (~ 40 μm). Microthermocouples (MTC) with junctions of 6-10 μm are used to detect the thermal transient. The MTC signal is amplified and digitally stored; repetitive analyses enable signal averaging for greater accuracy. Diffusivity determinations at 20 DC, utilizing comparative measurements with ethylene glycol as the reference fluid, give the following results: Water = 14.3, Ethyl alcohol = 8.5, l-propanol = 8.0 and l-pentanol = 7.5 (all results × 10−7 square meters/sec).

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