ORCID Profile
0000-0001-7424-4794
Current Organisations
Nanyang Technological University
,
University of Birmingham
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Publisher: Elsevier BV
Date: 12-2022
Publisher: American Physical Society (APS)
Date: 09-03-2020
Publisher: AIP Publishing
Date: 03-2016
DOI: 10.1063/1.4945441
Abstract: Gas and liquid adsorption-induced deformation of ordered porous materials is an important physical phenomenon with a wide range of applications. In general, the deformation can be characterized by the pore-load modulus and, when the pore size reduces to nanoscale, it is affected by surface effects and shows prominent size-dependent features. In this Letter, the influence of surface effects on the elastic properties of ordered nanoporous materials with internal pressure is accounted for in a single pore model. A porosity and surface elastic constants dependent closed form solution for the size dependent pore-load modulus is obtained and verified by finite element simulations and available experimental results. In addition, it is found to depend on the geometrical arrangement of pores. This study provides an efficient tool to analyze the surface effects on the elastic response of ordered nanoporous materials.
Publisher: Elsevier BV
Date: 10-2018
Publisher: Elsevier BV
Date: 05-2019
Publisher: American Chemical Society (ACS)
Date: 13-09-2016
DOI: 10.1021/ACS.LANGMUIR.6B02404
Abstract: The capillary penetration of fluids in thin porous layers is of fundamental interest in nature and various industrial applications. When capillary flows occur in porous media, the extent of penetration is known to increase with the square root of time following the Lucas-Washburn law. In practice, volatile liquid evaporates at the surface of porous media, which restricts penetration to a limited region. In this work, on the basis of Darcy's law and mass conservation, a general theoretical model is developed for the evaporation-limited radial capillary penetration in porous media. The presented model predicts that evaporation decreases the rate of fluid penetration and limits it to a critical radius. Furthermore, we construct a unified phase diagram that describes the limited penetration in an annular porous medium, in which the boundaries of outward and inward liquid are predicted quantitatively. It is expected that the proposed theoretical model will advance the understanding of penetration dynamics in porous media and facilitate the design of engineered porous architectures.
Publisher: Elsevier BV
Date: 09-2016
Publisher: Elsevier BV
Date: 11-2015
Publisher: Elsevier BV
Date: 05-2019
Publisher: Elsevier BV
Date: 06-2020
Publisher: Springer Science and Business Media LLC
Date: 10-09-2018
Publisher: Springer Science and Business Media LLC
Date: 10-2020
Publisher: Springer Science and Business Media LLC
Date: 06-07-2018
Publisher: Elsevier BV
Date: 08-2018
Publisher: Thomas Telford Ltd.
Date: 12-2022
Abstract: Desiccation cracks in clay play an important role in many geoenvironmental applications such as clay liners in engineered landfills, preferential flows and contaminant transport. In this study, a comprehensive series of experiments was conducted to investigate the desiccation cracks due to the combined effects of initial water content and layer thickness on bentonite clay. Slurries of bentonite were prepared with initial water contents ranging from 1200 to 2200%. The slurry was placed in a glass Petri dish and dried at a temperature of 30 ± 2°C. Results from the experiments were illustrated in a phase diagram, and it was found that the interplay between the initial water content and layer thickness has a significant effect on the formation and prevention of desiccation cracks. More specifically, a phase boundary distinguishing between cracked and non-cracked s les was obtained in the constructed phase diagram. A theoretical model based on the critical cracking thickness was developed and then was used to predict this observed phase boundary. Furthermore, a detailed morphology of crack patterns was investigated by employing image analysis techniques followed by statistical analyses. Findings from this study have potential use in clay liner design, where bentonite is used as the main material, as well as in other problems associated with drying soils.
Publisher: Elsevier BV
Date: 03-2019
DOI: 10.1016/J.JCIS.2018.12.068
Abstract: Control of capillary flow through porous media has broad practical implications. However, achieving accurate and reliable control of such processes by tuning the pore size or by modification of interface wettability remains challenging. Here we propose that the liquid flow by capillary penetration can be accurately adjusted by tuning the geometry of porous media. On the basis of Darcy's law, a general framework is proposed to facilitate the control of capillary flow in porous systems by tailoring the geometric shape of porous structures. A numerical simulation approach based on finite element method is also employed to validate the theoretical prediction. A basic capillary component with a tunable velocity gradient is designed according to the proposed framework. By using the basic component, two functional capillary elements, namely, (i) flow accelerator and (ii) flow resistor, are demonstrated. Then, multi-functional fluidic devices with controllable capillary flow are realized by assembling the designed capillary elements. All the theoretical designs are validated by numerical simulations. Finally, it is shown that the proposed concept can be extended to three-dimensional design of porous media.
Publisher: Elsevier BV
Date: 10-2016
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Mingchao Liu.