Fundamental Study on Heat Transfer and Flow Characteristics of Falling Liquid Film Evaporation of Next Generation Refrigerants

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K04497
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 24020:Marine engineering-related
• Research Institution: Tokyo University of Marine Science and Technology
• Principal Investigator: Jige Daisuke 東京海洋大学, 学術研究院, 准教授 (30708368)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 流下液膜蒸発 / 熱伝達 / 流動様相 / 次世代冷媒

Outline of Final Research Achievements

This study investigated the heat transfer and flow characteristics of falling film boiling of next-generation refrigerants with low global warming potential. In the visualization experiments, the effects of boiling bubble behavior, liquid film breakdown, and dry patches on the heat transfer and flow characteristics were evaluated. Furthermore, the effects of the liquid film flow rate, heat flux, evaporation temperature, surface properties, and test fluids on the heat transfer characteristics were clarified.

Free Research Field

熱工学

Academic Significance and Societal Importance of the Research Achievements

環境負荷の小さいHFO系冷媒を試験流体に用いて，沸騰を伴う流動様相の可視化と熱伝達率の同時計測を行い，熱伝達および流動特性に関する詳細な情報を提供した本研究の学術的意義は大きい．さらに，伝熱面の表面性状，試験流体の影響に関する評価結果は，今後の流下液膜蒸発の伝熱促進，蒸発器の性能向上につながると期待できる．