一种基于SAR-涡动原理的新型双层被动微混合器设计

ty10086 提交于 周三, 08/25/2021 - 16:02
文章英文标题
A new two-layer passive micromixer design based on SAR-vortex principles
正文
摘要微混合器是微流体系统中用于样品分析、生物反应器、药物输送等许多应用的关键部件。迄今为止,已经提出了许多被动微混合器的设计。其中,几个设计结构复杂的设计被证明是高效的。在本工作中,作者试图从制造方面提出一种新的低复杂度的高效设计。新设计是基于分裂重组( SAR )和涡旋混合原理的两层结构。建议采用软光刻技术在聚二甲基硅氧烷( PDMS )中制备新的设计。在利用计算流体力学( CFD )软件ANSYS Fluent 17.0模拟的3种新设计中,选择了这种新设计。将3种新设计命名为ND1、ND2、ND3,并利用混合指数( MI )和混合器效率( ME )量在0.1 ~ 100范围内对其混合性能进行数值评价。计算值与经典的Y型( CY )微混合器得到的值进行比较。通过求解连续性方程、Navier-Stokes方程和对流扩散方程计算流动和混合模式。将CY型微混合器的CFD结果与现有的实验和数值数据进行对比,发现两者吻合较好。结果表明,在所研究的微混合器设计中,ND3在整个Re数范围内具有最高的性能( ME达到36.86 % / mm )。ND3的最大压降( Re = 100时为3509.9 Pa )仍在文献报道的可接受压降范围内。ND3可作为CY的高效替代品。虽然ND3在Re数低于0.3或高于50时具有很高的效率( MI高达99.52 % ),但在中间Re数( 0.3 )时表现良好
文章内容(英文)
AbstractMicromixers are key components of microfluidic systems for sample analysis, bioreactors, drug delivery, and many other applications. To date, numerous passive micromixer designs have been proposed. Among those, several designs with complex design structures have been demonstrated to be efficient. In the present work, the authors try to propose a new efficient design with low complexity in terms of fabrication. The new design is two-layer and is based on the split and recombination (SAR) and vortex mixing principles. It is suggested to fabricate the new design in polydimethylsiloxane (PDMS) using the soft lithography technique. This new design is chosen among three new designs simulated using the computational fluid dynamics (CFD) software ANSYS Fluent 17.0. The three new designs are named ND1, ND2, and ND3 and their mixing performances are evaluated numerically using mixing index (MI) and mixer effectiveness (ME) quantities at four different Reynolds (Re) numbers in the range of 0.1–100. Calculated values are compared with those obtained for the classical Y-shaped (CY) micromixer. Flow and mixing patterns are computed by solving the continuity, Navier–Stokes, and the convection–diffusion equations. CFD results for the CY micromixer are compared with available experimental and numerical data and reasonable agreement is observed. According to the results, ND3 has the highest performance (ME up to 36.86 percent/mm) among the investigated micromixer designs in the entire range of Re numbers. The maximum pressure drop (35099.9 Pa at Re = 100 for ND3) is still in the range of acceptable pressure drops reported in the literature. ND3 can be used as an efficient substitute for CY. Although ND3 is highly efficient (MI up to 99.52%) at Re numbers lower than 0.3 or higher than 50, its performance at the intermediate Re numbers (0.3 \u0026lt; Re \u0026lt; 50) is poor and unacceptable (MI as low as 44%). This can be simply improved by adding extra mixing units to provide adequate mixing also at the intermediate Re numbers.
来源出处
Journal|[J]International Journal of Chemical Reactor EngineeringVolume 19, Issue 3. 2021. PP 309-329
DOI
https://doi.org/10.1515/IJCRE-2020-0222

PDMS臻品推荐

PDMS-微流控基质材料-PDMS/道康宁SYLGARD184-聚二甲基硅氧烷/0.5KG(组)

产品说明书PDF自助在线看:http://www.pdmshub.com/sih

信息更新:

美国总工厂生产的0.5KG原始包装的PDMS延期至2021年9月16日后才能交货,默认我们将发国内库存的进口分装产品(02085925-0.5KG);另受制于有机硅大幅涨价潮影响,2021年9月1日后将上调销售价格,另行通知。Dow Corning=道康宁=Dow SiL=陶氏,都是同一家公司。 2021.09.01更新

美国总工厂生产的0.5KG包装的PDMS恢复正常进口,合法正规,质量金标准,欢迎订购使用。并承诺从我司购买的皆为原厂包装,100%未开封,附带技术手册,非国产灌装仿制、非分装、非仿冒外包装产品,可以放心使用。大量订购更有优惠。2021.04.01更新

备注:由于dowsil与道康宁公司合并,美国总工厂生产的PDMS,价格涨幅高达1倍之多,因针对科研用户使用,特备货规格0.5KG。如果您需要美国总工厂原厂生产的大规格包装的预定,可以与QQ 11366508联系给予报价/货期。2021.05更新

此链接为PDMS-微流控芯片/PDMS/道康宁SYLGARD184/小桶0.5KG装的链接。

一般性的产品性能参数表参考以下小桶装的参数:

微流控芯片/PDMS/道康宁SYLGARD184;微流控芯片/PDMS/道康宁SYLGARD184;微流控芯片/PDMS/道康宁SYLGARD184;

品牌型号:道康宁SYLGARD184

包装规格:0.5KG/罐[含有45.4g固化剂,总重量为0.5KG]

产品颜色:保质期限:36个月

存放环境说明:室温,阴凉处保存

备注说明:

美国道康宁道康宁SYLGARD 184硅橡胶是由液体组分组成的双组分套件产品,包括基本组分与固化剂。基本组分与固化剂按10:1重量比完全混合,中等粘度混合液的稠度与SAE 40机油相似。无论厚薄,混合液将固化成为具有韧性的透明弹性体,最适用于电子/电气方面的封装与灌封应用。 道康宁SYLGARD 184硅橡胶在25~150℃的温度范围内固化,无放热现象,无需二次固化。固化过程完成后,可立即在-55~200℃的温度范围内使用。 产品特性:低毒性,在常规的工业操作中,无特别的注意事项; 无溶剂或固化副产物, 固化时不放热;无需特殊的通风条件,不会产生腐蚀;固化时,收缩量小; 固化后, 透明具有弹性;抗震与减缓机械震动;振动的传递性能小;元件可裸视检查与易修补性; 环保性能;低吸水性,良好的耐辐射性能;高真空状态下的低漏气性; 优异的电性能;较大温度范围内的稳定性, 抗解聚;在-55~200℃范围内,甚至在密闭状态下保持弹性与柔韧性,性能稳定; 阻燃性,UL可燃性分级为94 V-1,温度等级:130℃ 产品用途: 道康宁SYLGARD 184硅橡胶在电气/电子的封装与灌封方面有广泛的应用。