多孔介质壁面条件下微尺度流动的数值模拟_金文.pdfVIP

2010 5 28 3 M ay 2010 Vol. 28 No. 3 多孔介质壁面条件下微尺度流动的数值模拟 1, 2 1 3 金 文 , 张鸿雁 , 何文博 ( 1. , 710055; 2. , 710077; 3. , 710049) : 利用多孔介质模拟微通道壁面粗糙元, 建立了一种新的微尺 化流场的数值模拟方法. 多孔介质模型厚 由微通道壁面相对粗糙 折算, 多孔介质的阻力系数由该区域内的流态及阻 力计算; 配合采用k- E和 k- X 多种形式的湍流模型, 对边长为 600 Lm 的方形断面微通道流场 在雷诺数分别为 100和 300的情况下进行了数值模拟计算. 通过模拟结果与M icro- PIV 测量数 据的对比分析发现, 采用 realizablek- E湍流模型, 搭配多孔介质微尺 化模型进行数值计算, 能 够有效地模拟微尺 流场的流动状况, 而标准 k- E湍流模型和R G k- E湍流模型的微尺 模 拟计算结果虽接近试验测量值,但仍有偏差; 标准k- X 湍流模型和SST k- X湍流模型的微尺 模拟效果较差. : 微尺 通道; 流场; 多孔介质; 湍流模型; 数值模拟 : S275. 6; O357. 5 : A : 1674- 8530(2010) 03- 0271- 06 Num erical simulation for m icro-scale flow field w ith porous m edium m odel 1, 2 1 3 Jin Wen , ZhangH ongyan , H e Wenbo ( 1. School ofEnvironment andM unicipal Engineering, X ican A rchitectural and T echnologicalUniversity, X ican, Shaanx i710055, China; 2. Department of PowerEngineering, X ican A eronauticalCollege, X ican, Shaanxi 710077, China; 3. School of Energy and PowerEng-i neering, X ican JiaotongUniversity, X ican, Shaanx i710049, China) Abstract A novel numericalmethod for smi ulating m icro-scale flow field was established mainly by adopting porous medium model to smi ulate wall roughness elements. Thickness of porous media was converted by thewall relative roughness, and drag coefficientwas determ ined by flow state aswell as resistance of porousmedia. Under Reynolds number of 100 and 300 respectively, variousmodelswere applied to smi ulate the flow field of square-sectionm icro-channelw ith side length of600 Lm. Comparison between results of smi ulation and t