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<p>The influence of foulants dissolved in a solution on boiling heat transfer is substantial because it degrades the boiling regime and hinders high-efficiency heat removal. Understanding this phenomenon is therefore essential. In particular, its effects on the critical heat flux (CHF) and the onset of microbubble emission boiling (MEB) during subcooled boiling are critically important. In this study, a solution with a known concentration of copper deliberately eluted from the surface of a copper tube within a pool boiling vessel was prepared and used to carry out subcooled boiling experiments. Two types of elution time were prepared (copper tube immersion times of 10&#xa0;h and 118&#xa0;h). All boiling experiments were conducted at a subcooling of 50&#xa0;K. This enabled an investigation of the relationship between the eluted copper concentration and the boiling heat transfer performance. The concentrations of elements other than copper were also examined. The results showed that higher copper concentrations led to a change in the CHF and in the MEB onset temperature. Post-experiment observation of the heated surface revealed the presence of deposits. In addition, when the copper-eluted solution was applied to boiling experiments with a boiling bubble resonator (BBR)—a passive boiling heat transfer enhancement device—the vibrational operation of the BBR ceased in the low-heat-flux region, resulting in a transition to film boiling. This behavior was confirmed to occur because the thick deposited layer formed on the heated surface deteriorated the surface wettability, thereby suppressing vibration.</p>

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Investigation of subcooled boiling phenomena in water with dissolved copper from corroded pipe surfaces

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月11日

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  • Noriyuki Unno,
  • Kento Haruyama,
  • Tomotaka Kimura,
  • Kazuhisa Yuki,
  • Shin-ichi Satake

摘要

The influence of foulants dissolved in a solution on boiling heat transfer is substantial because it degrades the boiling regime and hinders high-efficiency heat removal. Understanding this phenomenon is therefore essential. In particular, its effects on the critical heat flux (CHF) and the onset of microbubble emission boiling (MEB) during subcooled boiling are critically important. In this study, a solution with a known concentration of copper deliberately eluted from the surface of a copper tube within a pool boiling vessel was prepared and used to carry out subcooled boiling experiments. Two types of elution time were prepared (copper tube immersion times of 10 h and 118 h). All boiling experiments were conducted at a subcooling of 50 K. This enabled an investigation of the relationship between the eluted copper concentration and the boiling heat transfer performance. The concentrations of elements other than copper were also examined. The results showed that higher copper concentrations led to a change in the CHF and in the MEB onset temperature. Post-experiment observation of the heated surface revealed the presence of deposits. In addition, when the copper-eluted solution was applied to boiling experiments with a boiling bubble resonator (BBR)—a passive boiling heat transfer enhancement device—the vibrational operation of the BBR ceased in the low-heat-flux region, resulting in a transition to film boiling. This behavior was confirmed to occur because the thick deposited layer formed on the heated surface deteriorated the surface wettability, thereby suppressing vibration.