Are you troubled by "bubbles"? Leave it to us!
Monozukuri (Saitama University Research Seed Collection 2025-27 p.57)
Keywords: Fluid dynamics, bubbles, flow visualization, high-speed composite measurement
I am studying the movement of surfaces between liquids and gases, such as bubbles and droplets. I am particularly focused on the sudden generation of bubbles that occurs when there is a decrease in pressure or an increase in temperature in a liquid, which is related to phase changes. These bubbles expand very vigorously and eventually collapse. It is said that even at sizes of just a few millimeters, they can generate enough impact to damage metal surfaces. Therefore, methods to accurately control the shock caused by bubbles are extremely important from an engineering perspective. On the other hand, if this shock can be properly controlled, it may be utilized in surface processing, or the momentum from the expanding bubbles could lead to the development of new fluid transport technologies. I aim to contribute to solving societal needs through research approaches that include theoretical reasoning, experimental validation, and precise high-speed visualization, primarily focusing on liquid flow, including the aforementioned multiphase flow.
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Akihito Kiyama, Associate Professor Graduate School of Science and Technology, Department of Mechanical Science, Production Science Area 【Recent Research Themes】 ● Elucidation and control of peculiar flows generated by rapid acceleration/deceleration and their design ● Establishment of novel cavitation generation mechanisms and their engineering applications ● High-speed liquid jet generation technology using snap-through ● Theoretical and experimental analysis of dynamic interactions between fluids and gels ● Development of flow field measurement techniques utilizing acoustics caused by bubble motion
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【Appeal Points to the Industry】 ● Focus on "experimentation" to clarify fluid phenomena ● Emphasis on discussion in technical support ● Rapid prototyping (model experiments) using 3D printers, soft silicone, etc. ● Quantitative evaluation through the combination of high-speed image measurement (visualization) and mechanical measurement ● Other support such as counseling and consulting from an academic perspective 【Examples of Practical Application, Case Studies, and Utilization】 ● Clarification of the shock generation mechanism associated with cavitation ● Development of a shock reduction mechanism using flexible structures with bubbles ● Elucidation of the relationship between head cavitation and brain injury, and development of protective devices ● Development of maintenance-free liquid delivery systems utilizing control of water hammer effects ● Monitoring of fine particle dispersion associated with steam explosions in heated oil
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High-speed visualization of tiny liquid droplets dispersing into the atmosphere due to bubble behavior.
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The Saitama University Open Innovation Center is a center that functions as a liaison office for industry-academia-government collaboration. It consists of three departments: the Industry-Academia-Government Collaboration Department, the Intellectual Property Department, and the Startup Support Department, each staffed with coordinators well-versed in various fields. The center's activities include solving technical challenges in companies, supporting the implementation of joint research, and conducting technology transfer aimed at introducing and utilizing Saitama University's intellectual property.