Effective Thermal Conductivity of Laminated Electrical Insulation Paper
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概要
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Effective thermal conductivity <I>k</I><SUB>e</SUB> of laminated electrical insulation paper, as a kind of compressible and porous media, is a function of burden pressure b and atmospheric pressure <I>p</I>. A heat flow model which has two paths, of contact portion and of void, is introduced in analysis, and the result is as follows<BR>where <I>k</I><SUB>0</SUB> (<I>b</I>) is equal to <I>k</I><SUB>e</SUB> at <I>p</I>=0, and is approximately a linear function of b.kn the thermal conductivity of air, υ<SUB>sf</SUB> (<I>b</I>) is a kind of void fraction and can be determined by measurement of thickness variation with burden pressures.Variable <I>x</I> is proportional to <I>p</I>, and <I>K(x)</I> is a function of <I>x</I>, which depends on a distribution of void size of the laminated paper. The above parameters are obtained by a series of experiments so that <I>k</I><SUB>e</SUB> at arbitrary values of <I>b</I> and <I>p</I> can be calculated by this semi-theoretical equation.A series of experimental data in the range of <I>b</I>=0.27-1.02 kg/cm<SUP>2</SUP> and <I>p</I>=0.3-760 mmHg shows validity of the equation.
- 公益社団法人 化学工学会の論文
公益社団法人 化学工学会 | 論文
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