A linear regime of hysteresis for calculating the dynamic contact angle under low capillary numbers with displacement experiments in microscale PDMS microchannels
| Autor: | Menggang Wen, Da Lei, Lei Wang, Yun Li, Feng Jingya |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Polydimethylsiloxane Capillary action media_common.quotation_subject 02 engineering and technology Mechanics Permeation 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Asymmetry Symmetry (physics) 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Physics::Fluid Dynamics Biomaterials chemistry.chemical_compound Hysteresis Colloid and Surface Chemistry chemistry 0210 nano-technology Displacement (fluid) Microscale chemistry media_common |
| Zdroj: | Journal of Colloid and Interface Science. 560:626-638 |
| ISSN: | 0021-9797 |
| DOI: | 10.1016/j.jcis.2019.10.038 |
| Popis: | Hypothesis Determining capillary pressures and permeation resistances of multiphase seepage in porous-type reservoirs is crucial. The dynamic contact angle (CA) is one of the critical parameters used to calculate capillary pressures and permeation resistances. Under reservoir conditions, dynamic CAs are rate-independent of the triple-phase contact line velocity. Calculating rate-independent dynamic CAs remains challenging and is the main focus of this paper. Experiments An experimental system was designed to capture the dynamic CAs of liquid-fluid displacements in microscale polydimethylsiloxane (PDMS) microchannels. These microchannels were 20 × 80 μm or 20 × 40 μm in height and width. The capillary numbers (Ca) were controlled to satisfy the conditions of Ca Findings Since pinning forces were consistent at the receding interface and the advancing interface, energy barriers exhibited symmetry. However, CA hysteresis exhibited asymmetry. Based on our experiments, a linear regime of hysteresis was developed and verified to be consistent with others’ experiments. The relation can be used to calculate hysteresis strengths and rate-independent CAs. This model was also compared with the fractal model. The hysteresis factor in this model can be derived using the Wenzel factor r and the Cassie fraction ϕs. |
| Databáze: | OpenAIRE |
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