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<p>An approach to process intensification is the use of motionless mixers. Among various motionless mixers, the helical pipe-type motionless mixer has attracted considerable attention. However, its mixing performance can vary greatly depending on the location of raw material injection. In this study, we developed a helical pipe-type motionless mixer that provides consistent mixing performance regardless of the injection position of the raw materials. This helical pipe-type motionless mixer has only one Kenics-type element in the center of the helical pipe. The mixing performance of this design was evaluated using computational fluid dynamics (CFD). The mixing performance was evaluated using the mixing coefficient <i>M</i><sub>c</sub> defined as an indicator of mixing efficiency between two liquids. The <i>M</i><sub>c</sub> for the helical pipe-type motionless mixer without elements has at most 0.5. However, the results showed that the helical pipe-type motionless mixer having more than 4 turns with one Kenics-type element resulted in <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11814_2025_501_Article_IEq1.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="75" /> </InlineMediaObject> <EquationSource Format="TEX">\({M}_{c}\ge 0.95\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi>M</mi> <mi>c</mi> </msub> <mo>≥</mo> <mn>0.95</mn> </mrow> </math></EquationSource> </InlineEquation> in the region where Reynolds number was greater than 30.</p>

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Enhancing Mixing Efficiency: A CFD-Driven Design of a Helical Pipe-Type Motionless Mixer with a Kenics-Type Element

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年6月17日

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  • Haruki Furukawa,
  • Otowa Takahashi,
  • Kaito Ikeda,
  • Yoshihito Kato,
  • Hyun Gi Koh,
  • Seung-Tae Koh

摘要

An approach to process intensification is the use of motionless mixers. Among various motionless mixers, the helical pipe-type motionless mixer has attracted considerable attention. However, its mixing performance can vary greatly depending on the location of raw material injection. In this study, we developed a helical pipe-type motionless mixer that provides consistent mixing performance regardless of the injection position of the raw materials. This helical pipe-type motionless mixer has only one Kenics-type element in the center of the helical pipe. The mixing performance of this design was evaluated using computational fluid dynamics (CFD). The mixing performance was evaluated using the mixing coefficient Mc defined as an indicator of mixing efficiency between two liquids. The Mc for the helical pipe-type motionless mixer without elements has at most 0.5. However, the results showed that the helical pipe-type motionless mixer having more than 4 turns with one Kenics-type element resulted in \({M}_{c}\ge 0.95\) M c ≥ 0.95 in the region where Reynolds number was greater than 30.