慶應義塾大学 · 工学
長坂祐司教授の研究室は、熱物性の高精度測定とその応用に焦点を当てた研究を推進しています。特に、宇宙探査や高温・高圧環境下での材料性能評価に不可欠な熱伝導率や熱拡散率の精密測定技術の開発が中心です。微小な熱源を用いた一時的ホットワイヤ法や光熱放射法を応用し、機能梯度材料や電解質水溶液の熱的性質を精密に評価しています。これらの技術は、宇宙機器の熱制御材料開発や新素材の特性評価に応用されています。
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Abstract In recent planetary exploration space missions, spacecraft are exposed to severe thermal environments that are sometimes more extreme than those experienced in earth orbits. The development of advanced thermal control materials and devices together with reliable and accurate measurements of their thermophysical properties are needed for the development of systems designed to meet the engineering challenges associated with these space missions. We provide a comprehensive review of the st
Abstract The paper describes absolute measurements of the thermal conductivity of aqueous NaCl solutions in the concentration range 0 to 5 molality, the temperature range 0 to 80°C and the pressure range 0.1 to 40 MPa. An apparatus is based on the transient hot‐wire method using coated wire. The accuracy of the experimental results is estimated to be ± 0.5%. The results constitute the first measurements of the pressure effect on the thermal conductivity of NaCl solutions. The pressure coefficien
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPrecise measurements of the thermal conductivity of toluene and n-heptane by the absolute transient hot-wire methodYuji Nagasaka and Akira NagashimaCite this: Ind. Eng. Chem. Fundamen. 1981, 20, 3, 216–220Publication Date (Print):August 1, 1981Publication History Published online1 May 2002Published inissue 1 August 1981https://pubs.acs.org/doi/10.1021/i100003a006https://doi.org/10.1021/i100003a006research-articleACS PublicationsRequest reuse permission
We have developed a new apparatus to evaluate thermal duffusivity and thermal effusivity distributions of functionally graded materials (FGMs) by photothermal radiometry (PTR). Since this method is applicable to the low modulation frequency range down to 1 mHz, it is suitable for the measurement of thermally thick samples such as FGMs. We have solved heat conduction equations for a multi-layered model applicable to the present PTR measurement. The effects on the phase lag measurement caused by t
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