V06_Chemometrics and Intelligent Laboratory Systems: Passive Diffusive Micromixers
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V06_Chemometrics and Intelligent Laboratory Systems: Passive Diffusive Micromixers

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Questions and Answers

What is the formula for the time of residence (tr) of a particle in a channel for diffusive mixing?

  • tr = lchannel / vmean (correct)
  • tr = lchannel * vmean
  • tr = lchannel^2 / vmean
  • tr = vmean / lchannel
  • In the context of passive diffusive micromixers, what does the diffusion time (tD) represent?

  • Time taken for particles to accelerate in the channel
  • Time taken for particles to mix perfectly
  • Time taken for particles to reach the end of the channel
  • Time taken for particles to diffuse across the channel width (correct)
  • What is the minimum channel length required for complete diffusive mixing in a microfluidic system?

  • lchannel = D / vmean^2
  • lchannel = tD / vmean
  • lchannel = vmean / tD
  • lchannel = vmean^2 / D (correct)
  • In a Y-mixer design, what is the role of laminar flow in achieving mixing?

    <p>Laminar flow helps in maintaining particle velocity</p> Signup and view all the answers

    Which parameter determines the minimum channel length for complete mixing in a passive diffusive micromixer?

    <p>Diffusion coefficient (D)</p> Signup and view all the answers

    How can the channel length be shortened in microfluidic systems?

    <p>By incorporating layering techniques</p> Signup and view all the answers

    What happens when the diffusivity D is too small in the context of microfluidic systems?

    <p>The channel length becomes longer</p> Signup and view all the answers

    Which technique is used for passive mixing by interdigitated lamella in microfluidic systems?

    <p>Layering technique</p> Signup and view all the answers

    How is the minimum channel length reduced by layering techniques in microfluidic systems?

    <p>By stacking channels on top of each other</p> Signup and view all the answers

    In the context of microfluidic systems, what effect does reducing diffusion length have on the channel design?

    <p>Reduces the minimum channel length</p> Signup and view all the answers

    What is the main purpose of passive diffusive micromixers in microfluidic systems?

    <p>To achieve complete diffusive mixing</p> Signup and view all the answers

    What is the primary advantage of using diffusive mixing in microfluidic systems?

    <p>It allows for rapid mixing of fluids without the need for active components or external energy sources.</p> Signup and view all the answers

    In a Y-mixer configuration, what determines the extent of diffusive mixing between the two inlet fluid streams?

    <p>The channel geometry and dimensions after the junction.</p> Signup and view all the answers

    What is the relationship between the diffusion length ($l_D$) and the time required for complete diffusive mixing ($t_D$) in a microfluidic channel?

    <p>$t_D = l_D^2 / D$</p> Signup and view all the answers

    In a microfluidic channel with laminar flow, what is the diffusion length ($l_D$) typically defined as?

    <p>Half of the channel width.</p> Signup and view all the answers

    Which of the following statements regarding passive diffusive micromixers is correct?

    <p>They rely solely on the channel geometry and diffusion to promote mixing.</p> Signup and view all the answers

    What is the primary limitation of passive diffusive micromixers compared to active micromixers?

    <p>They require longer channel lengths to achieve complete mixing.</p> Signup and view all the answers

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