摘要
为了探究液滴撞击热多孔介质表面的热流耦合问题,笔者建立了三角锯齿模型来表征多孔材料的表面粗糙度,运用二维轴对称模型来简化三维问题的计算。运用流体体积法(volume of fluid,VOF)来追踪液滴变形过程中两相界面的变化,运用RNG k-epsilon模型来计算湍流的影响。研究结果表明:液滴的We数越大,润湿能力越强,多孔材料的降温效果也越好;多孔材料表面温度T;越高,液滴的渗透能力越强,多孔材料的降温效果也越好;液滴比热容c;越小,液滴的渗透能力越强,但对多孔材料的降温效果越差;多孔材料表面粗糙度R;越大,液滴润湿能力越差,但对多孔材料的降温效果增加。该研究成果对多孔介质表面湿润、渗流及传热热有一定的参考意义。
In order to study the fluid-thermal coupling problem of droplet impacting on hot porous media surface,a triangular sawtooth model was established to characterize the surface roughness of porous materials.A two-dimensional axisymmetric model was used to simplify the calculation of three-dimensional problems.Volume of fluid(VOF)method was used to track the change of two-phase interface during the droplet deformation,and RNG k-epsilon model was used to calculate the effect of turbulence.The results show that the larger We number of droplet,the stronger the wetting ability and the better the cooling effect of porous materials;the higher the surface temperature of porous material T;is,the more permeable the droplet is and the better the cooling effect of porous material is.The smaller the specific heat capacity c;of droplet is,the more permeable the droplet is,but the worse the cooling effect on porous material is.The larger the surface roughness R;of porous materials is,the worse the wetting ability of droplets is,but the cooling effect of porous materials is increased.The research results have some reference significance for the surface wetting,permeation and heat transfer of porous media.
作者
刘毅诚
李培超
LIU Yicheng;LI Peichao(School of Mechanical and Automotive Engineering,Shanghai University of Engineering Saience,Shanghai 201620,China)
出处
《轻工机械》
CAS
2022年第2期13-20,共8页
Light Industry Machinery
基金
上海市自然科学基金(19ZR1421400)。
