论文标题
评估脉冲输入对T形通道中非牛顿流体混合特性的混合特性的有效性
Assessing Effectiveness of Pulsed Input on Mixing Characteristics of Non-Newtonian fluids in T-shaped Channels
论文作者
论文摘要
然而，由于流量的层流性质，微流体中的试剂混合是各种应用所必需的，因此在较小的长度范围内有效混合变得困难。非牛顿液的混合分析至关重要，因为它们通常在实际应用中遇到。为此，我们研究了使用脉冲速度入口条件混合非牛顿流体的有效方法。在本研究中，非牛顿流体是使用功率定律模型建模的，该模型具有不同的流体流变学，从剪切增厚到剪切变薄。为了增强混合，脉冲速度入口条件以不同的相角和频率施加，并与恒定速度入口条件进行比较。我们证明了使用脉冲速度入口条件增强的混合，并使用脉冲输入速度达到97.6％的最大混合，相位差为180°，并且考虑剪切效率的频率为5 Hz的频率（n = 0.6）。对于相同条件，牛顿和剪切增厚流体（n = 1.4）的混合指数分别为89.1％和85.2％。本研究将有助于设计微弹器，以在较小的长度和时间范围内有效地混合非牛顿流体。
Mixing of reagents in microfluidics is necessary for various applications however, due to the laminar nature of flows, efficient mixing in a small span of length and time becomes difficult. The analysis of mixing of non-Newtonian fluids is critical as they are commonly encountered in practical applications. Towards this, we investigated an effective way for mixing of non-Newtonian fluids using pulsatile velocity inlet conditions. In the present study, the non-Newtonian fluid is modelled using the power law model with varying fluid rheology from shear thickening to shear thinning. For enhancing the mixing, pulsed velocity inlet condition is applied with varying phase angle and frequency and compared with constant velocity inlet condition. We demonstrated enhanced mixing using pulsing velocity inlet condition and achieved a maximum mixing of 97.6% using pulsed input velocity with a phase difference of 180° and considering a frequency of 5 Hz for the case of shear-thinning fluid (n=0.6). For the same condition, the mixing index is 89.1% and 85.2% for Newtonian and shear thickening fluid (n=1.4), respectively. The present study will be helpful in designing micromixers for mixing non-Newtonian fluid effectively in a small span of length and time.
