Thermal conductivity of abnormally behaving liquids: Prediction methods and their applicability in microgravity conditions

Details Thermal conductivity of abnormally behaving liquids: Prediction methods and their applicability in microgravity conditions Thermal conductivity of abnormally behaving liquids: Prediction methods and their applicability in microgravity conditions

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aipc..458..842l&link_type=abstract

Space technology and applications international forum -1999. AIP Conference Proceedings, Volume 458, pp. 842-847 (1999).

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Thermal Conduction In Nonmetallic Liquids, Thermal Instruments And Apparatus

Scientific paper

Most organic and inorganic liquids show a general decrease of the thermal conductivity but very few compounds show an increase of thermal conductivity with temperature. Hydrogen and Water show an even more abnormal behavior since their thermal conductivity increases from the melting point to a reduced temperature of about 0.65-0.70 then decreases at higher temperatures. Due to their peculiar behavior, none of the general prediction methods developed for organic and inorganic liquids are effective for such substances in their saturated liquid state over the whole temperature range, from melting point to near the critical point. In this paper we present an estimation method able to evaluate thermal conductivity of Hydrogen and Water in their saturated liquid state from the melting point near to the critical point. The equation we present, as a new result of a previously introduced prediction method, links the thermal conductivity of water and Hydrogen with the reduced temperature. Tests, performed against experimental data, show a good accuracy of the method being the deviations generally less than 3% with peak deviations less than 10%.

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