Netsu Bussei

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A magnetic levitation densimeter for accurate PVT-property measurement has been investigated. For the existing densimeter, the most serious factor of the measurement uncertainty is a density measurement error caused by magnetism of materials around magnetic coupling which is composed of a permanent magnet in a sample fluid and an electromagnet suspended from an electronic balance. The error was quantitatively analyzed by the Finite Element Method (FEM), and two methods for reducing the error were devised; one is to keep the permanent magnet at the same position in every measurement state by controlling the position of the electromagnet, while the other is to use a hybrid magnet which is composed of an electromagnet combined with a permanent magnet. In addition, the new preliminary densimeter was developed, which is able to correct the error by using two sinkers with different densities even if magnetism of the sample fluid is unknown.

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The variation of enthalpy per unit mass of ice, generated by melting of ice in aqueous solution, was defined as “latent heat of ice in aqueous solution&rdquo. The calculating method of “latent heat of ice in aqueous solution&rdquo, using apparent latent heat, nearly no variation of IPF, was presented. Additionally, the experiment of adding ice into solution, and calorimetrical analysis using DSC were performed, in order to compare with the results of this calculation. Finally, since these values obtained by the measurements and by the calculation well agreed with each other, the calculating method proposed in this study was proved to be adequate.

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