Mingzheng Zhou
Beijing University of Technology
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ASME 2011 9th International Conference on Nanochannels, Microchannels, and Minichannels, Volume 2 | 2011
Guodong Xia; Jian Li; Hongjie Wu; Mingzheng Zhou; Haiyan Wang
A novel passive micromixer with fan-shaped cavity based on the principle of flow planar asymmetric split-and-recombine (P-ASAR) and focusing/diverging is designed. The micromixer consists of two split sub-channels with unequal widths and one fan-shaped cavity structure on the major sub-channel which are similar to a diamond ring structure. In order to yield optimum mixing effect, different parameters of geometry structure under a wide range of Reynolds numbers (1–80) have been investigated by numerical simulation with three-dimensional Navier-Stokes equations. The steady laminar flow was solved by using a finite-volume method and SIMPLE algorithm. Enhanced micromixing is achieved by utilizing a synergistic combination of unbalanced inertial collision, Dean vortices and expansion vortices. As a result of interplay between inertial, centrifugal and viscous effects, Dean vortices arise in the vertical plane of curved channel. Expansion vortices appear in the horizontal plane due to an abrupt increase of the cross-sectional area. The mixing index is used to evaluate the degree of mixing. Our studies show that vortices are observed in the channels at high Reynolds numbers. The geometry parameters of fan-shaped cavity structure affect the mixing index of micromixer. When the ratio of the widths of the major sub-channel and fan-shaped cavity channel is 1/3, the mixing index of this type micromixer could reach around 75% at Reynolds numbers larger than 60. The relation between mixing intensity and pump power consumption has been analyzed at a wide range of Reynolds numbers simultaneously.Copyright
Applied Thermal Engineering | 2013
Lei Chai; Guodong Xia; Mingzheng Zhou; Jian Li; Jingzhi Qi
Applied Thermal Engineering | 2011
Guodong Xia; Lei Chai; Haiyan Wang; Mingzheng Zhou; Zhenzhen Cui
International Communications in Heat and Mass Transfer | 2011
Lei Chai; Guodong Xia; Mingzheng Zhou; Jian Li
International Journal of Heat and Mass Transfer | 2013
Lei Chai; Guodong Xia; Liang Wang; Mingzheng Zhou; Zhenzhen Cui
International Journal of Thermal Sciences | 2011
Guodong Xia; Lei Chai; Mingzheng Zhou; Haiyan Wang
Science China-technological Sciences | 2012
Mingzheng Zhou; Guodong Xia; Lei Chai; Jian Li; LiJun Zhou
Industrial & Engineering Chemistry Research | 2012
Guodong Xia; Jian Li; Xinping Tian; Mingzheng Zhou
Experimental Thermal and Fluid Science | 2014
Lei Chai; Guodong Xia; Liang Wang; Mingzheng Zhou
Archive | 2012
Guodong Xia; Jian Li; Mingzheng Zhou; Xinping Tian