金属骨架断面对石蜡相变传热影响的模拟分析

Simulation Analysis of Influence of Metal Frame Section on Paraffin Phase Transition Heat Transfer

以填充金属骨架的矩形石蜡方腔作为研究对象,分别选取完整方腔、单纵向断面(纵向断面与高温壁面平行)方腔、3纵向断面方腔、单横向断面(横向断面与高温壁面垂直)方腔,模拟分析金属骨架断面对石蜡熔化速率、金属骨架导热强化效果的影响。固态石蜡完全熔化时间由短到长的排序为:完整方腔、单横向断面方腔、单纵向断面方腔、3纵向断面方腔,完整方腔与单横向断面方腔的固态石蜡完全熔化时间接近。当腔体高温壁面与金属骨架断面平行时,断面对方腔内固态石蜡完全熔化时间影响极大:较大的断面宽度使熔化速率在固态石蜡熔化过程中出现明显下降;断面数量越多,固态石蜡完全熔化时间越长。当腔体高温壁面与金属骨架断面垂直时,断面对方腔内固态石蜡完全熔化时间几乎没有影响。当腔体高温壁面与金属骨架断面平行时,断面削弱金属骨架的导热强化作用。当腔体高温壁面与金属骨架断面垂直时,断面对金属骨架的导热强化作用基本没有影响。

Taking the rectangular paraffin cavity filled with the metal frame as the research object,the complete square cavity,single longitudinal section(longitudinal section parallel to the high-temperature wall)square cavity,3 longitudinal section square cavity and single transverse section(transverse section perpendicular to the high-temperature wall)square cavity are selected respectively to simulate and analyze the influence of metal frame section on the paraffin melting rate and the heat conduction enhancement effect of the metal frame.The order of complete melting time of solid paraffin from short to long is:complete square cavity,single transverse section square cavity,single longitudinal section square cavity and 3 longitudinal section square cavity.The complete melting time of solid paraffin in complete square cavity is close to that in single transverse section square cavity.When the high-temperature wall surface of the cavity is parallel to the section of the metal frame,the section has a great influence on the complete melting time of solid paraffin in the square cavity:The larger section width causes the melting rate to decrease significantly during the melting of solid paraffin;The more the number of sections,the longer the complete melting time of solid paraffin.When the high-temperature wall surface of the cavity is perpendicular to the section of the metal frame,the section has almost no effect on the complete melting time of solid paraffin in the square cavity.When the high-temperature wall surface of the cavity is parallel to the section of the metal frame,the section weakens the heat conduction enhancement effect of the metal frame.When the high-temperature wall surface of the cavity is perpendicular to the section of the metal frame,the section has basically no effect on the heat conduction enhancement effect of the metal frame.