熱流体研究から見た地球温暖化問題と炉工学の共通点

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Scientific interest in the environmental and meteorological fields has been recently focused on the estimation of the temperature rise on the earth in the near and distant future. This problem is strongly related to the imbalance of the amount of carbon on the earth after the industrial revolution; termed the "Missing Sink" problem. The temperature rise is estimated by the gas transfer fiux=(gas transfer rate) × (partial pressure difference of CO_2 between air and sea surface). It is very difficult to measure and estimate the gas exchange coefficient resulting from the air-sea interaction because of the very high Schmidt number (Sc) turbulent fluid flow with free surface deformation. On the other hand, the utilization of a high Prandtl number (Pr) fluid flow with a free surface as a coolant in an advanced magnetic fusion reactor and as a chamber protection scheme in an inertial confinement fusion reactor have been considered. Because the diffusivities of high Pr or Sc fluids are very small, when the high temperature or concentration regions appear on the free surface, caused by plasma radiation or carbon-dioxide gas absorption, respectively, the scalar transport from the free surface to the bulk flow is very slow compared to the fluid motion. In this paper, some common aspects between the heat transfer of high Pr free surface flow in fusion engineering and the mass transfer of high Sc free surface flow in the global warming problem are discussed.
社団法人プラズマ・核融合学会の論文
2000-11-25

熱流体研究から見た地球温暖化問題と炉工学の共通点

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