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<p>Frequent vibration poses a risk of boiling crisis in the cold plate of EV batteries, consequently, investigating the impact of vibration signals on the battery cold plate is imperative. This paper simulated R134a vapor flow in a vibrating tube vs. static conditions, analyzing vortex, Nusselt number, friction factor, and flow characteristics. The results shown that, vortex intensity correlated positively with vibration strength, shifting vortex cores towards the inlet. Optimal 5 mm/15 Hz vibration enhanced heat transfer by 7 %, while 10 mm/25 Hz worsened it by 17 %. By explaining the effect of amplitude and frequency on the flow heat transfer performance separately, it was found that the Nusselt number is more sensitive to the change of amplitude, and the change of the two is basically positively correlated. The results develop the theory of boiling crisis, offered a reference framework for the design of EV battery cooling plates.</p>

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Heat transfer characteristics of R134a vapor flow in a rectangular channel under vibration conditions

  • 期刊论文

  • 发表日期：

    2025年5月7日

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  • Hemin Hu,
  • Xinzhe Wang,
  • Tao Wang,
  • Chang Liang

摘要

Frequent vibration poses a risk of boiling crisis in the cold plate of EV batteries, consequently, investigating the impact of vibration signals on the battery cold plate is imperative. This paper simulated R134a vapor flow in a vibrating tube vs. static conditions, analyzing vortex, Nusselt number, friction factor, and flow characteristics. The results shown that, vortex intensity correlated positively with vibration strength, shifting vortex cores towards the inlet. Optimal 5 mm/15 Hz vibration enhanced heat transfer by 7 %, while 10 mm/25 Hz worsened it by 17 %. By explaining the effect of amplitude and frequency on the flow heat transfer performance separately, it was found that the Nusselt number is more sensitive to the change of amplitude, and the change of the two is basically positively correlated. The results develop the theory of boiling crisis, offered a reference framework for the design of EV battery cooling plates.