PARTIAL WETTING DYNAMICS OF NON-POWER LAW FLUIDS ON VARIOUS SOLID SUBSTRATES

摘要：

The spreading dynamics of several non-Newtonian fluids were investigated both experimentally and theoretically. The testing fluids, which have non-power law rheological behavior, included CMC (carboxy methylcellulose) aqueous solutions, silica nanoparticles dispersed in PEG400, and silica nanoparticles dispersed in PDMS. All the fluids partially wetted the tested solid substrates. The θD～U experimental data indicated that the non-power law fluids have a power-law fluid like behavior with partial wetting. The dynamic wetting process of non-power law fluids can be described by a theoretical model for power law fluid with an effective power exponent ne. This behavior is attributable to the limiting shear rate distribution near the contact line that dominates the spreading dynamics. The value of ne for each fluid on different solid substrates depends on the static contact angle, indicating that the dominating shear rate region not only related to the rheological behavior of fluid, but also lies on the properties of the solid substrate.

关键词： non-power law fluid non-Newtonian Spreading dynamic partial wetting

作者: Qi Min Yuanyuan Duan Xiaodong Wang Zhanpeng Liang Junyue Zhu Chao Si

作者单位: Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,Tsinghua Universit Department of Thermal Engineering, School of Mechanical Engineering,University of Science and Techno

会议类型: 国际会议

会议名称: The Ninth Asian Thermophysical Properties Conference(第九届亚洲热物理性能会议 ATPC 2010)

会议地点: 北京

会议语种:英文

页码: 948-953

在线出版日期: 2010-10-19（万方平台首次上网日期，不代表论文的发表时间）