Department of Chemical Engineering, National Taiwan University, Taipei 106, Taiwan.
Biomicrofluidics. 2012 Jun 13;6(2):24130. doi: 10.1063/1.4729129. Print 2012 Jun.
Polymer stretching in two-phase microfluidics is investigated by dissipative particle dynamics. The flow patterns can be controlled by wall wettability, flowrate ratio between two phases, and Reynolds number (Re). For neutral and partially wettable walls, segmented flows are formed and polymer stretching can be controlled by Re and segment length. At high Re, stratified flows are observed and the extension ratio can be tuned by the flowrate ratio. For nonwettable walls, slug flows are formed and polymer stretching can be controlled by Re and slug length. At high Re or flowrate ratio, annular flows are observed and high extension ratio can be easily attained.
通过耗散粒子动力学研究了两相间微流中的聚合物拉伸。通过壁面润湿性、两相流速比和雷诺数（Re）可以控制流型。对于中性和部分润湿的壁面，形成分段流，聚合物拉伸可以通过 Re 和段长来控制。在高 Re 下，观察到分层流，通过流速比可以调整延伸比。对于不润湿的壁面，形成弹状流，聚合物拉伸可以通过 Re 和弹状长度来控制。在高 Re 或流速比下，观察到环形流，很容易达到高延伸比。
