球形LNGタンクの非定常温度分布について
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概要
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For the LNGC cooling down of cargo tank is essentially necessary to avoid an excessive thermal stress during cargo loading. Consequently the figures of transient temperature distributions over the spherical shell of tank and cylindrical skirt which supports the tank for the MRV type LNGC are important as an indicative factors for the judgement of thermal stress as well as the guidance figures for various cargo handling procedures. In this paper basic transient differential equations of temperature for each state of tank, cooling down, cargo loading, cargo unloading and sea going at ballast condition were established for the spherical and cylindrical shell and numerical solutions were obtained by means of finite difference method of explicit form. As for the skirt two kinds of configuration, namely with and without thermal brake function consisting of stainless steel plate were treated. Since physical properties of each material which cover the wide range of temperature vary with the temperature, those were treated as a function of temperature and incorporated in the equations as the non-linear form. Jakob's formula for heat transfer on a vertical surface due to natural turbulent convection was applied for the heat transfer coefficient of tank inner surface viewing the correlation of temperature between the actual ship and calculation. As a result measured and calculated values showed a good coincidence except for the small deviation at the area of relatively higher temperature.
- 社団法人日本船舶海洋工学会の論文
- 1988-03-22
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