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<p>The present study examines experimentally the time-periodic evaporation characteristics of refrigerants R-410A and R-134a under controlled fluctuating mass flux conditions. Rigorous testing highlights the significant influence of refrigerant properties on heat transfer efficiency and wall temperature stability across various vapor qualities. Results reveal that R-410A, with its lower surface tension, supports smaller, more frequently detaching bubbles, enhancing convective heat transfer and stabilizing wall temperature. Stability is especially beneficial at higher vapor qualities, where R-410A exhibits reduced temperature oscillations and improved thermal efficiency. In contrast, R-134a’s higher surface tension results in larger, less frequent bubble detachment, creating local thermal gradients and leading to greater wall temperature fluctuations. This characteristic increases thermal resistance and may limit R-134a’s suitability in applications requiring high thermal stability. Overall, findings underscore the advantages of selecting refrigerants with lower surface tension for applications involving time-periodic flow, positioning R-410A as the preferred choice in such dynamic thermal systems. Future research is recommended to evaluate additional refrigerants and flow patterns to optimize thermal management in cyclic conditions.</p>

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Comparative analysis of thermal behaviors in time-periodic evaporation of R-410A and R-134a refrigerants

  • 期刊论文

  • 发表日期：

    2025年6月9日

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  • C. A. Chen,
  • H. J. Shiung,
  • T. F. Lin,
  • Wen-Ken Li,
  • Wei-Mon Yan

摘要

The present study examines experimentally the time-periodic evaporation characteristics of refrigerants R-410A and R-134a under controlled fluctuating mass flux conditions. Rigorous testing highlights the significant influence of refrigerant properties on heat transfer efficiency and wall temperature stability across various vapor qualities. Results reveal that R-410A, with its lower surface tension, supports smaller, more frequently detaching bubbles, enhancing convective heat transfer and stabilizing wall temperature. Stability is especially beneficial at higher vapor qualities, where R-410A exhibits reduced temperature oscillations and improved thermal efficiency. In contrast, R-134a’s higher surface tension results in larger, less frequent bubble detachment, creating local thermal gradients and leading to greater wall temperature fluctuations. This characteristic increases thermal resistance and may limit R-134a’s suitability in applications requiring high thermal stability. Overall, findings underscore the advantages of selecting refrigerants with lower surface tension for applications involving time-periodic flow, positioning R-410A as the preferred choice in such dynamic thermal systems. Future research is recommended to evaluate additional refrigerants and flow patterns to optimize thermal management in cyclic conditions.