極低温液化ガス船の2次元矩形タンク内流体の乱流熱流動について

概要

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In the cryogenic liquefied gas tanks of LNG or LH_2 tanker buoyancy driven flow occurs induced by the inevitable heat flow through tank walls from the surroundings of higher temperatures. Flow pattern is not limited to the boundary layer flow along the wall but the bulk flow is dominant due to the enclosed configuration of tank. In this paper a numerical study is performed for the turbulent two-dimentional liquid flow in a symmetrical rectangular enclosure where the positive heat flux exists through the verticel wall and horizontal bottom and negative heat flux at the free surface of liquid caused by the natural evaporation of vapor. The ω-φ, vorticity-stream function equations converted from the original continuity and mean momentum equations and mean thermal energy equation are solved using a two-dimentional turbulent model of 0-equation. Results have been obtained in the range of Rayleigh number of 5.41×10^<17> to 5.41×10^<11> (8.19×10^<18> to 8.19×10^<12>), eddy kinematic viscosity of 9.94×10^<-4> to 9.94×10^<-1>m^2/h (7.06×10^<-4> to 7.06×10^<-1>) and eddy diffusivity for heat 1.10×10^<-3> to 1.10m^3/h (7.84×10^<-4> to 7.84×10^<-1>) for LNG (LH_2) and for the study of the correlation between an actual tank and theory pressure built up calculations have been performed in the same procedures as above-mentioned.
社団法人日本船舶海洋工学会の論文
1991-03-29