鳞片石墨表面附壁空泡溃灭过程及流场特性
Collapse process and flow field characteristics of bubbles attached to graphite surface
董星 1陈吉烽 1李雪堂 1姜运2
作者信息
- 1. 黑龙江科技大学 机械工程学院,哈尔滨 150022
- 2. 黑龙江科技大学 安全工程学院,哈尔滨 150022
- 折叠
摘要
利用空化效应解离鳞片石墨是提高鳞片石墨解离度的重要方法之一.为研究鳞片石墨表面附壁空泡溃灭形态演化规律及流场特性,采用FLUENT软件数值模拟单个空泡附壁溃灭过程,多相流模型选择VOF模型,湍流模型采用SST k-ω模型,分析了空泡溃灭形态演化过程及流场特性.结果表明:空泡在鳞片石墨表面附壁溃灭时,经历了空泡被拉长扁化,上侧表面凹陷形成微射流和微射流击穿空泡的3 个阶段;随着围压的增加,空泡溃灭产生的微射流的最大速度、冲击速度和冲击压力均增大,当冲击压力达到鳞片石墨解离的临界冲击压力时,将实现对鳞片石墨的解离.
Abstract
This paper is concerned with the insight that dissociating flake graphite with cavitation effect is one of the important methods to improve the dissociation degree of flake graphite.This paper fo-cuses on the investigating the evolution law of collapse process and flow field characteristics of the bubbles attached to graphite surface.The study consists of using FLUENT software to numerically simulate the collapse process of the single bubble attached to wall;selecting VOF model as multiphase flow model and SST k-ω model as turbulence model;and analyzing the evolution process of bubble collapse morphology and flow field characteristics.The results show that as the bubbles adhered to the surface of flake graphite collaspe,they go through three states:the bubbles are elongated and flattened,the upper surface dents and forms a micro jet,and the micro jet penetrates the bubbles.The maximum velocity,impact velocity,and impact pressure of the micro jet generated by bubble collapse all increase with the increase of the confining pressure.When the impact pressure reaches the critical impact pressure for the dissociation of flake graphite,the dissociation of the flake graphite achieves.
关键词
鳞片石墨/多相流动/VOF模型/流场特性/空泡溃灭Key words
flake graphite/multiphase flow/VOF model/flow field characteristics/cavitation collapse引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据