Improvement of mixing performence of blade-free planetary mixer using precessing motion

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K04346
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 20010:Mechanics and mechatronics-related
• Research Institution: Niigata University
• Principal Investigator: Takayuki Yamagata 新潟大学, 自然科学系, 准教授 (50554284)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 遊星式攪拌 / 歳差回転流れ / モード分解 / 混合

Outline of Final Research Achievements

The relation between inertial oscillation mode of flow field and mixing performance in blade-free planetary mixer was investigated. The volume of fluid (VOF) method was used to analyze the flow field and mixing performance, and the influence of the precession motion of the container was considered by adding centrifugal force and Coriolis force. In order to validate the analytical results, the mixing progress was experimentally visualized and measured using the Mie scattering method. Numerical analysis reproduced a mixing pattern that qualitatively agreed with the experiment. Proper orthogonal decomposition (POD) and dynamic mode decomposition (DMD) were applied to the flow field data. From the modal decomposition of the flow field, it was clarified that there is a spatial mode near the liquid surface in the flow field with high mixing performance, and this mode decayed slowly over time.

Free Research Field

可視化工学

Academic Significance and Societal Importance of the Research Achievements

本研究では、羽根なし遊星式攪拌における流れ場の数値解析データに対する振動モード解析に加えて、混合性能の評価を行う事で、流れの慣性振動と混合との関係を明らかにした。その中で、従来の理論解析や数値解析結果に基づき遊星式攪拌の混合性能の予測や性能向上の検討が可能であることが示された。また、流れ場の振動モードと混合性能との間に強い関係性が示されたことから、混合性能の向上において流れ構造のモード分解は有効な手段であることが明らかとなった。