CAJ | 학술논문

边界滑移是微流动的关键特征之一，通过改变流道壁面的滑移状态，为微流动控制提供了新的途径。基于微缝隙下的近壁面滑移效应，结合Navier滑移边界条件，建立亲疏液复合壁面下二维微缝隙剪切流的精确解模型。采用计算流体动力学方法进行微流动建模仿真以验证该数学模型的可靠性，在此基础上结合文献中试验测量所得的滑移参数值，针对壁面滑移状态不同的微缝隙，利用该数学模型研究其内部的微流动规律。结果显示：伴随着壁面运动的微缝隙滑移流场迅速变化，在毫秒级甚至更短时间内趋向于稳定状态。疏液型壁面的运动状态对滑移流动影响小，亲液型壁面的静止状态比运动状态对液体具有更强的束缚能力；在纳米级缝隙中，超亲液静止壁面和超疏液运动壁面结合时，液体将被强力地吸附在亲液壁面上。
변계활이시미류동적관건특정지일，통과개변류도벽면적활이상태，위미류동공제제공료신적도경。기우미봉극하적근벽면활이효응，결합Navier활이변계조건，건립친소액복합벽면하이유미봉극전절류적정학해모형。채용계산류체동역학방법진행미류동건모방진이험증해수학모형적가고성，재차기출상결합문헌중시험측량소득적활이삼수치，침대벽면활이상태불동적미봉극，이용해수학모형연구기내부적미류동규률。결과현시：반수착벽면운동적미봉극활이류장신속변화，재호초급심지경단시간내추향우은정상태。소액형벽면적운동상태대활이류동영향소，친액형벽면적정지상태비운동상태대액체구유경강적속박능력；재납미급봉극중，초친액정지벽면화초소액운동벽면결합시，액체장피강력지흡부재친액벽면상。
Boundary slip is one of the key features of micro-flow, and it provides a new way for flow control by changing the slip status of flow channel .Based on the slip effect adjacent to the wall in the micro-gap and the Navier slip boundary condition , a model of exact solution to the shear flow in the two-dimensional micro-gap with a lyophilic and lyophobic wall is constructed .Then, the reliability of the proposed mathematical model is verified by establi-shing a simulation model of micro-flow based on the computational fluid dynamics method , and it is used to investi-gate the micro-flow laws in the micro-gaps with different slip properties according to the slip parameters obtained from the experimental results in relevant literatures .The results show that (1) the slip flow in the micro-gap varies rapidly with the wall movement , and it tends to be steady within milliseconds or below;(2) the lyophilic stationary wall is of a stronger adsorption ability to liquid in comparison with the moving one , while the motion status of the lyophobic wall has a small impact on the slip flow; and ( 3 ) in nano-scale gaps , the integration of the super-lyophilic stationary wall with the super-lyophobic moving wall causes a strong adsorption of liquid on the lyophilic wall to occur .