Numerical Simulation of Mixing Performances of a Passive Micromixer with Internal Ribs
Effective mixing of microfluids is the basic requirement for biochemical analysis. Unfortunately, the macroscale mixing methods such as stirring and creation of turbulent flow are not applicable to the mixing of microfluids. To tackle such problems, we proposed a new, passive micromixer with internal ribs, which improves the mixing performances by changing the internal structure and shape of microchannels, and increasing the interfacial surface areas as far as possible. In this paper, the impact of geometric parameters on the mixing performance, and the pressure loss of the proposed micromixer were simulated using the software package FLUENT. The simulation shows that the mixing index M of each crosssection increases initially and then decreases with the increase of inlet velocity V. It also shows that at Point V=0.01m/s, the fluid mixing changes from convective mass transfer to molecular diffusion mass transfer. With the increase of Wl, the mixing index M of each crosssection decreases gradually, whereas it increases accordingly with the growth of P/W. The larger the number of internal ribs is, the better the mixing performance of the micromixer will be. On the other hand, the mixing index M of the proposed micromixer decreases with the increase of H/W. At H/W >=0.6, the variation of H/W imposes little influence on the micromixers mixing performance. At Q=28.8mLh-1, an improved mixing efficiency and lowered pressure loss will be achieved, thus meeting the requirement of microfluidic chip.
Mixing Performance Internal Ribs Passive Micromixer Numerical Simulation
L.Guo S.S.Zhang K.J.Han
Institute of Thermal Science &Technology Shandong University, Jinan China
国际会议
西安
英文
1024-1029
2009-07-11（万方平台首次上网日期，不代表论文的发表时间）