Noncontact manipulation of microflow by photothermal control of viscous force
Noncontact manipulation of microflow by photothermal control of viscous force
复制标题
DOI：
10.1016/j.ijheatfluidflow.2010.05.005
复制
发表时间：
2010-12-01
影响因子：
2.6
通讯作者：
Honami, Shinji
中科院分区：
文献类型：
--
作者：
Motosuke, Masahiro;Shimakawa, Jun;Honami, Shinji
本文研究了非接触式微流控装置中粘性力的局部控制方法。光热效应和液体粘度的温度依赖性是导致微通道内流体粘度分布不均匀的关键因素。聚焦激光的吸收产生了与温度变化相对应的液体粘度的局部变化。用微米分辨率粒子图像测速仪和激光诱导荧光分别测量了速度场和温度场。测量结果表明，温升引起的流体粘度的局部降低可以引起聚焦微通道内流动结构的变化激光加热区域即高温区，流动速度增加，加热区周围的流体行为也得到了认可。此外，实验结果与数值模拟的结果一致，阐明了微观流动结构变化的主要因素是局部控制的粘性力(C)2010爱思唯尔公司版权所有
In this paper we investigate a potential of local control of the viscous force in a microfluidic device for a noncontact microflow manipulation method Photothermal effect and temperature dependence of the liquid viscosity play a key role to induce an inhomogeneous viscosity distribution in the flow field in a microchannel Absorption of focused laser beam generates the local change in the viscosity of liquid corresponding to the temperature change The velocity and temperature fields are measured by the micron-resolution particle image velocimetry and laser-induced fluorescence respectively Measurement results indicate that the local reduction of the fluid viscosity due to the temperature rise can cause the change of the flow structure in the microchannel At the focused area of heating laser beam namely high temperature area the flow velocity was increased The accompanying fluid behavior around the heated region was also recognized In addition the agreement between the experimental results and numerical simulation clarifies that the primary factor for the change of the microflow structure is the locally controlled viscous force (C) 2010 Elsevier Inc All rights reserved