结构参数对超疏水微通道湍流阻力特性的影响

Effect of Structural Parameters on the Turbulent Resistance Characteristics of Superhydrophobic Microchannels

为研究湍流状态下结构参数对超疏水微通道阻力特性的影响,采用VOF模型和Realizable k-ε湍流模型对具有横向微观结构的超疏水表面微通道流场进行了三维数值模拟。结果表明,具有横向微观结构的超疏水表面微通道产生了增阻现象;无量纲压降比和微通道平均摩擦因子均随凹槽宽度增大而减小,当凹槽宽度增大到某一值时出现减阻的效果,但受凹槽深度的影响不显著;随微通道高度、宽度增加,无量纲压降比和微通道平均摩擦因子均降低。

The VOF model and the Realizable k-ε turbulent model are used to simulate the three- dimensional flow field of super hydrophobic micro - channels with transverse microstructures to investigate the impact of the structural pa- rameters on the resistance characteristics in the turbulent regime. The results show that the super - hydrophobic micro - channels with transverse microstructure give rise to the phenomenon of increasing resistance. The dimensionless pres- sure drop reduction and the microchannel average friction factor decrease with the increase of the groove width, and the drag reduction effect is achieved when the groove width is increased to a certain value, but it is not significantly affected by the depth of the groove. As the increase of the mierochannel diameter and the microchannel width, the dimension- less pressure drop reduction and the microchannel average friction factor are reduced.