Numerical analysis on optimization of porosity distribution in a reaction-diffusion system using an adjoint method
Conference proceedings article
ผู้เขียน/บรรณาธิการ
กลุ่มสาขาการวิจัยเชิงกลยุทธ์
รายละเอียดสำหรับงานพิมพ์
รายชื่อผู้แต่ง: Patcharawat Charoen-amornkitt, Mengly Long, Mehrzad Alizadeh, Takahiro Suzuki, Shohji Tsushima
ปีที่เผยแพร่ (ค.ศ.): 2022
บทคัดย่อ
Electrochemical devices are needed to support renewable and sustainable energy technologies, and they have received a lot of attention in the last few decades. For energy management and peak-shaving, strong electrical energy storage technologies, such as vanadium redox flow batteries, are necessary when power generation shifts from fossil fuels to solar or wind energies. Lithium-ion batteries and polymer electrolyte fuel cells are utilized in battery electric vehicle and fuel cell vehicle applications, respectively. The electrodes, where the electrochemical processes take place, are the most important part of these devices. Porous electrodes are commonly utilized in such devices because porous media provide a large surface area per volume for reactions. The larger the surface area leads the larger the reaction site and, as a result, the higher the performance. However, cell performance of these devices still need to be enhanced to lower material costs before they can be widely commercialized. Because the electrodes are the key component of such a device, modifying the electrodes directly improves cell performance [1-3]. This can be accomplished by lowering irreversible loss due to electrode structure. One of the promising approaches to design the structure of porous media is structural optimization, which can be categorized in to three methods, i.e. sizing, shape, and topology optimization. Each of these methods place a focus on different aspects of the structure. Topology optimization is an approach to optimize layout of the structure within a given design space in which the layout can be any shape. Recently, topology optimization has been gaining attention to different physical problems [4,5]. The objective of this study is to perform topology optimization of porosity distribution and entropy generation analysis in reaction-diffusion systems. An adjoint equation for determining porosity distribution was developed in this work and the optimization problem is formulated in such a way that it maximizes the reaction in the design domain. Because the solution of topology optimization is directly related to design dimensionality, the 2D and 3D optimization results are obtained and investigated. A geometrically complicated bio-like flow field for both cases was observed. Because of this structure, the specie was able to reach the farthest end with high concentration, resulting in minimal entropy generation in the system. Although, in our previous work, when compared to that of the 0D and 1D models, the 2D model significantly increased the overall reaction in the design space, the result from the 3D model was not significantly different from that of the 2D model (see Fig.1). Thus, considering the cost required for simulation, the 2D was suggested to be the optimal design dimensionality for conducting the analysis.
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