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Parametric study of lotus-type pore shape in solid subject to Henry's laws at interfaces
1Department of Mechanical and Electro-Mechanical Engineering, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan, ROC.
Heliyon
|August 9, 2023
Summary
This study investigates pore formation during unidirectional solidification, revealing how gas dissolution and Henry
Area of Science:
- Materials Science and Engineering
- Physics of Materials
- Chemical Engineering
Background:
- Lotus-type porous materials with directional properties are crucial in food, biomedical, and micro/nanotechnologies.
- Understanding pore formation mechanisms during solidification is essential for controlling material properties.
- Previous work considered solute transport, boundary layers, and liquid-gas interface physics.
Purpose of the Study:
- To rigorously investigate the mechanisms governing the length and maximum radius of lotus-type or single pores.
- To provide a quantitative understanding of pore formation during unidirectional solidification under gas dissolution.
- To establish algebraic predictions supported by a table for various dimensionless working parameters.
Main Methods:
- Utilized algebraic predictions based on dimensionless working parameters.
- Incorporated Henry's law at liquid-gas interfaces and Young-Laplace equation.
- Analyzed solute transport, concentration boundary layers, and solidification parameters.
Main Results:
- Developed a table of algebraic predictions for pore length and maximum radius.
- Identified key dimensionless parameters influencing pore formation, including Henry's law constant, mass transfer coefficient, partition coefficient, and solidification rate.
- Demonstrated that controlling pore shape, specifically for lotus-type pores, is achieved by matching predicted maximum diameter with inter-pore spacing during the freezing of gas-dissolved water.
Conclusions:
- The study provides a comprehensive framework for understanding and predicting pore formation mechanisms during unidirectional solidification.
- The findings enable quantitative control over the dimensions of lotus-type pores by manipulating solidification and gas dissolution parameters.
- This research contributes to the design and fabrication of advanced porous materials for various technological applications.
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