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<p>The influence of the squeeze film between the tube and the support structure on flow-induced vibrations is a critical factor in tube bundles subjected to two-phase cross-flow. This aspect can significantly alter the threshold for fluidelastic instability and affect heat transfer efficiency. This paper presents a mathematical model incorporating the squeeze film force between the tube and the support structure. We aim to clarify the mechanisms underlying fluidelastic instability in tube bundle systems exposed to two-phase flow. Using a self-developed computer program, we performed numerical calculations to examine the influence of the squeeze film on the threshold of fluidelastic instability in the tube bundle system. Furthermore, we analyzed how the thickness and length of the squeeze film affect both the underlying mechanisms and the critical velocity of fluidelastic instability.</p>

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Mechanism of the Fluidelastic Instability of a Flexible Tube with a Squeeze Film Within a Rigid Tube Array Subjected to Two-Phase Flow

  • 期刊论文

  • 发表日期：

    2025年9月20日

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  • Shi-hao Yang,
  • Jiang Lai,
  • Hong-jun Zhu

摘要

The influence of the squeeze film between the tube and the support structure on flow-induced vibrations is a critical factor in tube bundles subjected to two-phase cross-flow. This aspect can significantly alter the threshold for fluidelastic instability and affect heat transfer efficiency. This paper presents a mathematical model incorporating the squeeze film force between the tube and the support structure. We aim to clarify the mechanisms underlying fluidelastic instability in tube bundle systems exposed to two-phase flow. Using a self-developed computer program, we performed numerical calculations to examine the influence of the squeeze film on the threshold of fluidelastic instability in the tube bundle system. Furthermore, we analyzed how the thickness and length of the squeeze film affect both the underlying mechanisms and the critical velocity of fluidelastic instability.