Creation of functional multiphase fluids-smart materials and their measurement and simulation evaluation

Name

Jun Ishimoto, Institute of Fluid Science, Professor

Outline of Research

We will create functional multiphase fluids and materials with ferromagnetic particles that react to magnetic fields dispersed in dispersants such as oil and silicone rubber. We will also clarify and improve the functional properties of these materials in response to magnetic fields through numerical simulations based on coupled analysis that treats flow, deformation, and particle-particle interactions simultaneously and through fusion evaluations with actual measurements. In addition, as a problem related to hydrogen energy storage and transportation, we will conduct a coupled analysis to simultaneously treat crack growth on the material (structure) side, concentration diffusion behavior during hydrogen leakage, and chemical reaction in order to predict the leakage mechanism and diffusion of reactive hydrogen gas due to crack initiation in the bulkhead of a high-pressure hydrogen storage tank caused by hydrogen embrittlement and ignition and combustion phenomena. The coupled analysis method, which simultaneously handles crack growth on the material (structure) side, concentration diffusion behavior during hydrogen leakage and chemical reaction, is used to predict the diffusion behavior and combustion limit of leaked hydrogen.

Research Purpose

We are developing a functional multiphase fluid (MR fluid) in which ferromagnetic particles are dispersed in oil or gas. Its viscoelasticity changes in response to a magnetic field by improving its fluidity and magnetic functionality in response to a magnetic field. In addition, for magnetic functional multiphase materials (MR elastomers), in which ferromagnetic particles are dispersed and cured in a matrix such as silicon rubber, we will establish a coupled analysis method that simultaneously handles the magnetic interaction between the particles and the elastic deformation of the matrix structure that is deformed as a result of the interaction. Furthermore, will develop a new method that combines the method with actual measurements. We will improve the MR performance and stability and create magnetic functional soft materials for practical use. In addition, we will clarify the details of the leakage mechanism and diffusion prediction of reactive hydrogen gas caused by cracks in the bulkhead of high-pressure hydrogen storage tanks due to hydrogen embrittlement and ignition and combustion phenomena by using a coupled analysis method that simultaneously handles structural analysis, fluid analysis, and chemical reaction of the constructed materials, and will serve as a stepping stone to the design of a highly safe hydrogen energy system. This approach will serve as a foothold for the design of safe hydrogen energy systems.

Expected Effect

As functional multiphase fluids and materials, we plan to commercialize oil-based MR fluids, dry MR fluids, and MR elastomers with ferromagnetic particles dispersed in oil or gas or in a matrix such as silicone rubber, etc., with improved performance, stability, and durability, through our academic advisor, SmartTECH Lab. Ltd. In addition, a database for hydrogen safety management will be constructed by collecting the results of coupled analysis of hydrogen leakage and information on various troubles and accidents at hydrogen stations in operation. A safety evaluation method using deep learning is expected to be put into practical use.

該当するSDGｓへの取り組み

連絡先

TEL：022-795-6982
E-mail address: ishimoto*alba.ifs.tohoku.ac.jp
Please use @ instead of ＊.
HP URL: http://alba.ifs.tohoku.ac.jp/