Thermal Conductivity of Water and Steam at High Temperatures and Pressures : 1st Report, Experimental Apparatus and Results with Water up to 200℃

概要

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The experimental results of measuring the thermal conductivity of water and steam at high temperatures and pressures are rather limited and their accuracy is generally poor. In the present paper, for the accurate measurement of thermal conductivity of water and steam at high temperatures and pressures, a new experimental apparatus with a silver co-axial cylinder cell is constructed. Measurement of liquid water up to 200℃ and 1470 bar is carried out with an accuracy better than 1.4% and it is proved that the results are well expressed by a simple equation of temperature and density. A comparison with the published data up to now shows that the present results agree well with those in the lower pressure region than 500 bar. However, the data by Amirkhanov et al. show a considerable deviation from the present results around 200℃ in the higher pressure region than 1000 bar.
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