网格尺寸对液滴蒸发的影响  

Effects of mesh size on droplet evaporation

作　　者：罗坤[1] 金台 樊建人[1] 岑可法[1] 

机构地区：[1]浙江大学能源清洁利用国家重点实验室,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2011年第12期2176-2180,共5页Journal of Zhejiang University：Engineering Science

基　　金：全国优秀百篇博士学位论文作者专项资助项目(2007B4);国家自然科学基金资助项目(51176170);浙江省钱江人才计划资助项目(2010R10035)

摘　　要：为了有效地模拟实际工业应用中的液雾蒸发和燃烧,采用有限差分方法对无限热传导液滴蒸发模型进行了研究,并与相关的实验数据进行了对比和验证,发现采用定常的背景热质条件对网格的大小不敏感,但在实际计算过程中采用的当地瞬时热质条件所依赖的网格大小,对液滴蒸发具有重要影响.研究表明只有当网格的尺寸达到液滴直径的10倍左右时,采用当地瞬时的热质条件才可以得到满意的结果.此外,还发现关联数的校正格式及液滴在网格内的初始位置对液滴蒸发的影响不大.To effectively simulate spray evaporation and combustion in realistic industrial applications, a finite difference method was used to study droplet evaporation with infinite thermal conductivity assumption, and the results were compared to relevant experimental data for validation. It is found that the model is insensitive to grid size when constant underlying temperature and mass conditions are used. However, the local instantaneous temperature and mass conditions are dependent on grid size in actual realistic calculations, which imposes significant effects on droplet evaporation prediction. Only when the local grid size is around 10 times of the droplet diameter, satisfactory results can be obtained using the local instantaneous temperature and mass conditions. In addition, corrective schemes for incidence number and initial droplet position in a grid cell have negligible effects on droplet evaporation simulation.

关 键 词：液滴蒸发 无限热传导模型 热质条件 网格尺寸 

分 类 号：O359.1[理学—流体力学]