University of the Ryukyus · Faculty of Engineering · 准教授

Research keywords流体力学・伝熱工学

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• Mist cooling lithium–ion battery thermal management system for hybrid electric vehicles2024 · Battery Thermal Management System (BTSM) is essential for maintaining optimal operation conditions for hybrid electric vehicles (HEVs) and electric vehicles (EVs). This study aimed to propose an innovative impinging jet cooling BTMS for HEVs using mist cooling. The dilute mist completely evaporated to avoid the risk of external circuit failure or corrosion that could result from surface wetting. Impinging experiments were performed under the conditions where inflow air temperature, Ta,in, was 21.2 °C ≤ Ta,in ≤ 31.0 °C and initial humidity, φ, was 50.9 %RH ≤ φ ≤ 96.0 %RH. It was found that the target plate was cooled down by up to 0.8 K without surface wetting by adding 5.5 mg/s water mist to the air. Numerical analyses were performed under conditions ranging from 21.2 °C ≤ Ta,in ≤ 31.0 °C and 0.0 %RH ≤ φ ≤ 100.0 %RH. The results and discussion highlight the importance of the critical initial humidity, φcritical: the complete evaporative threshold. Deviation between the experimental and numerical results at a fixed inflow air temperature, Δφ, was −1.9 %RH ≤ Δφ ≤ 3.0 %RH. Δφ was within the range of measurement uncertainty U(φ) = 4.0 %RH. Thus, the experimental and numerical results were consistent within the experimental measurement uncertainty. As a result, φcritical tends to be high in the case of high inflow temperature. The mist cooling is a viable way of BTMS for HEVs without surface wetting due to its large cooling capacity that results in a 7.4 K cooling effect in a hot environment.
• 屋内海藻培養技術と福祉雇用連携の取組み2023 · <p>In this study, we investigated and analysed issues related to the working environment and wages for employment of people with disabilities, particularly in the context of cooperation between agriculture and welfare. We also examined the possibility of a new business collaboration using the onshore seaweed farming technology developed by the Faculty of Engineering at the University of the Ryukyus. As a result, we proposed a sustainable social business model by building a cooperative system that introduces new stakeholders to the business model, where it has been difficult for people with disabilities to participate.</p>
• Mathematical Modelling and Statistical Optimization of Fast Cultivation of Agardhiella subulata: Response Surface Methodology2022 · The production of algae within a short period has become an emerging issue among researchers due to its diversified usage. At the same time, researchers are working extensively on how to upsurge algae production using carbon dioxide. The motto of this study is to develop a fast algae production system utilizing carbon dioxide and employing mathematical as well as statistical analysis to optimize production. Response surface methodology (RSM) constructed on the central composite design (CCD) was applied to assess the potential contributions of cultivation time, irradiance light, and carbon dioxide concentration during the cultivation process. In addition, their interaction effects were evaluated in the cultivation period. In this study, the cultivation period was the most significant contributor to algae cultivation, followed by light and carbon dioxide. The highest A. Subulata of 0.24 g was attained with 418 μmol/m2/s, 7 days, and 19 mg/l for light intensity, cultivation time, and carbon dioxide concentration, respectively. The experimental data were analyzed using the modified Logistics, modified Gompertz, modified Schnute, and modified Richards models, and it was determined that the modified Logistics model fits the experimental data better than the other three models, as evidenced by the low values of RMSD (0.0286), AIC (-2.409), and BIC (-4.251) and high value of R² (0.98). Increasing algae production employing carbon dioxide will help to promote a sustainable environment and attain sustainable development goals (SDGs).
• A study on heat transfer characteristics by impinging jet with several velocities distribution2021 · Diop S.N.

• 海洋バイオマス利活用に関する研究2007 · ■■■
• 微小ミスト蒸発による高効率伝熱促進2003 · ■■■
• 時系列フラクタル伝熱構造の制御による高性能アクティブ伝熱促進2003 · 若手研究(B)
• 管内強制対流場の乱流熱伝達

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