Micromixing process in microfluidic devices has been broadly employed in bio-, nano-, and environmental technologies using either miscible or immiscible liquids. However, there are limited experimental studies investigating the mixing process of different densities and viscosities liquids in relation to microfluidics. Therefore, the mixing process of propan-2-ol and water, water and sodium chloride solution, propan-2-ol and sodium chloride solution were experimented and reported at 5 ≤ Re ≤ 50 in T-junction and offset T-junction microchannels. For miscible mixing experiments, i.e. propan-2-ol and water, water and sodium chloride solution, both microchannels show mixing index for each Reynolds number is directly proportional to the mixing time. At low Reynolds number, higher molecular diffusion takes place while at low flow rate, the residence time of fluid is high. The mixing performance is relatively good at high Reynolds number of 40 and 50 due to the significant convection which is caused by the effect of stretching and thinning of liquid lamellae. For immiscible propan-2-ol and sodium chloride solution mixing, offset T-junction microchannel offers better mixing performance than T-junction microchannel at both low and high Reynolds number. The chaotic mixing happened at the intersection of the T-junction microchannel due to the direct interaction of two liquids entering the junction at high momentum.

微流体装置中的微混合工艺已广泛用于使用可混溶或不可混溶液体的生物，纳米和环境技术中。然而，仅有有限的实验研究来研究与微流体有关的不同密度和粘度的液体的混合过程。因此，对丙-2-醇与水，水与氯化钠溶液，丙-2-醇与氯化钠溶液的混合过程进行了试验，并报道了在T结和偏置T结微通道中5≤Re≤50。对于混溶混合实验（即丙-2-醇和水，水和氯化钠溶液），两个微通道均显示每个雷诺数的混合指数均与混合时间成正比。在低雷诺数下，较高的分子扩散发生在低流速下，流体的停留时间长。由于显着的对流是由液体薄片的拉伸和稀化作用引起的，因此在40和50的高雷诺数下，混合性能相对较好。对于不混溶的丙-2-醇和氯化钠溶液的混合，在低雷诺数和高雷诺数下，偏置T型结微通道都比T型结微通道具有更好的混合性能。由于两种液体以高动量进入交界处的直接相互作用，所以在T交界处的微通道的交点处发生了混沌混合。在低雷诺数和高雷诺数下，偏置T型结微通道都比T型结微通道提供更好的混合性能。由于两种液体以高动量进入交界处的直接相互作用，所以在T交界处的微通道的交点处发生了混沌混合。在低雷诺数和高雷诺数下，偏置T型结微通道都比T型结微通道提供更好的混合性能。由于两种液体以高动量进入交界处的直接相互作用，所以在T交界处的微通道的交点处发生了混沌混合。