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A note on thermal history kernel for unsteady heat transfer of a spherical particle

机译:用于热历史核的一个注意,用于球形颗粒的不稳定传热

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摘要

When a particle is subjected to an unsteady ambient flow, in terms of either time-dependent relative velocity or time-dependent temperature difference, the net heat transfer from the particle cannot be calculated based on the quasi-steady heat transfer correlation alone. Due to unsteady evolution of the thermal boundary layer, there is also a history contribution to heat transfer. The history contribution to heat transfer is expressed as a convolution integral of past evolution of temperature difference between the particle and the surrounding. While Basset history force and its finite Reynolds number extension have been well studied, similar understanding of unsteady heat transfer and thermal history kernel is lacking. We use existing particle-resolved simulation results to develop a finite Peclet number thermal history kernel, which when used with the convolution integral is demonstrated to accurately predict unsteady heat transfer over a range of Peclet numbers and particle-to-fluid heat capacity ratio.
机译:当颗粒经受不稳定的环境流动时,就任一时依赖的相对速度或时间依赖性温度差而言,不能基于单独的准稳态传热相关来计算来自颗粒的净热传递。由于热边界层的不稳定演变,还存在对传热的历史贡献。传热的历史贡献表示为颗粒与周围温差的过去演化的卷积积分。虽然已经很好地研究了Basset历史力和其有限雷诺数,但缺乏对不稳定的传热和热历史内核的类似了解。我们使用现有的粒子分辨模拟结果来开发有限的Peclet数热历史内核,当与卷积积分一起使用时,证明了在一系列Peclet数和粒子流体热容比上准确地预测不稳定的传热。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第12期|121781.1-121781.7|共7页
  • 作者

    S. Balachandar; M.Y. Ha;

  • 作者单位

    University of Florida USA;

    Mechanical Engineering Pusan National University Pusan South Korea;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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