Novel Method of Measuring Heat Capacity of Supercritical Fluid Using Peltier Elements
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概要
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We present a simple and convenient method of measuring the heat capacity of a fluid sample at a high pressure. A heat-flux-type calorimeter containing a sample cell with a thin wall and small holes is placed in a high-pressure vessel filled with the fluid sample itself. A thermoelectric module serves as the heat pump and heat flow sensor by taking advantage of the Peltier and Seebeck effects, respectively. To obtain the total heat transferred from the measured raw data, we employ a new estimation technique with a least-squares method. The performance of the method is examined by the measurement of supercritical CO2. The temperature increase necessary for the measurement can be suppressed to less than 40 mK; such a small amount scarcely disturbs the state for a temperature-sensitive sample. This method is suitable for determining the heat capacities of supercritical fluids including the states relatively close to a critical point.
- 2006-01-15
著者
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Nishikawa Keiko
Division Of Diversity Science Graduate School Of Science And Technology Chiba University
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Tozaki Ken-ichi
Department Of Physics Faculty Of Education Chiba University
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Koga Yoshikata
Department Of Chemistry The University Of British Columbia
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Nishikawa Keiko
Division of Diversity Science, Graduate School of Science and Technology, Chiba University, Inage, Chiba 263-8522, Japan
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Kido Yasutaka
Department of Physics, Faculty of Education, Chiba University, Inage, Chiba 263-8522, Japan
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