,A Purely Elastic Instability and Mixing Enhancement in a 3D Curvilinear Channel Flow

• 作 者: LI Feng-Chen ZHANG Hong-Na CAO Yang KUNUGI Tomoaki KINOSHITA Haruyuki OSHIMA Marie
• 机 构: School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001“,”Department
• 出 处: 中国物理快报（英文版）
• 发表日期: 2012年9期

We report the detailed information of a purely elastic instability and its mixing enhancement effect in a viscoelastic fluid flow driven by a constant pressure gradient along a curvilinear channel obtained for the first time from the three-dimensional direct numerical simulations (DNSs) of this kind of flow geometry.Three-dimensional unstable flow structures similar to those visualized in experiments are realized through the DNSs.The inception of elastic instability,conformation of microstructures,statistical and dynamic information of velocity field and the mixing enhancement effect caused by elastic instability are then discussed.