Separation characteristics of fluid flow inside two parallel plates with wavy surface
Separation characteristics of fluid flow inside two parallel plates with wavy surface
复制标题
两平行波面板内流体流动分离特性
DOI：
10.1016/s0020-7225(02)00029-0
复制
发表时间：
2002
影响因子：
6.6
通讯作者：
Mohammad Arif Hasan Mamun
中科院分区：
文献类型：
--
作者：
S. Mahmud;A. Islam;Mohammad Arif Hasan Mamun
本文用数值方法研究了定常层流条件下两平行波纹板内流体的分离特性。控制方程采用基于控制体积的有限体积法进行离散，变量配置合理。采用SIMPLE算法和SIP求解器求解方程组。研究了表面波纹度（由振幅与平均壁间距之比a/H定义）和纵横比（由波长与平均壁间距之比w/H定义）对流体流动分离特性的影响。本工作是在表面波纹度a/H=0-0.3，纵横比w/H=1.5-2.25的条件下进行的。临界雷诺数（Rec）用于识别通道中流体流动第一次分离的出现。临界雷诺数（Rec）计算的表面波度和宽高比的宽范围内。对于特定的雷诺数，分离泡的结构强烈地依赖于表面的波度和纵横比，而随波数（n）的变化很小。最后给出了平均摩擦系数随雷诺数变化的压降特性。
Separation characteristics of fluid flow inside two parallel wavy plates for steady-laminar flow is investigated numerically in the present study. Governing equations are discretized using control volume based finite-volume method with collocated variable arrangement. SIMPLE algorithm is used and SIP solver is applied for solution of system of equations. Effect of surface waviness (defined by amplitude to average interwall spacing ratio, a/H) and aspect ratio (defined by wavelength to average interwall spacing ratio, w/H) on separation characteristics of fluid flow is presented. The present work has been carried out for surface waviness a/H=0–0.3, aspect ratio w/H=1.5–2.25. A critical Reynolds number (Rec) is used to identify the appearance of first separation of fluid flow in the channel. Critical Reynolds (Rec) number is calculated for wide range of surface waviness and aspect ratio. The structure of separation bubble depends strongly on waviness of the surface and aspect ratio for a particular Reynolds number and changes little with wave number (n). Finally pressure drop characteristics is presented in terms of average friction factor as a function of Reynolds number.