Passive mixing refers to the process of achieving fluid mixing without the need for external energy input, relying instead on the natural flow dynamics and geometrical design of microfluidic channels. This method is particularly important in lab-on-a-chip systems, where efficient mixing at small scales can be achieved through specific channel designs that enhance interfacial area and promote chaotic advection. By incorporating passive mixing strategies, lab-on-a-chip devices can optimize reaction efficiency and reduce the time required for sample processing.
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