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首页> 外文期刊>Heat Transfer Engineering >Comparative Study of Heat Transfer Parameter Estimation Using Inverse Heat Transfer Models of a Trailing Liquid Nitrogen Jet in Welding
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Comparative Study of Heat Transfer Parameter Estimation Using Inverse Heat Transfer Models of a Trailing Liquid Nitrogen Jet in Welding

机译：焊接时尾随液氮射流反向传热模型估算传热参数的比较研究

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摘要

Welding induces distortions and stresses in welded structures. A heat sink trailing the weld arc is one among the methods used to reduce the stresses and distortions. Researchers have made use of cooling agents like atomized water and liquid nitrogen (LN2) jet as trailing heat sinks. As the inclusion of a heat sink alters the temperature distribution, estimation of heat removal due to cooling jet is a prerequisite for the study of the effects of the heat sink on stresses and distortions. Analytical methods for the estimation of heat transfer parameters are complicated due to nonuniform cooling by the impinging jet, boiling heat transfer of cooling jet, stray fluid particles on the work-piece surface, and the sharp localized temperature gradient on the work piece due to weld heat input. Therefore, an inverse heat transfer (IHT) method is adapted to estimate the heat transfer parameters due to heat sink. Experiments were conducted using automated tungsten inert gas welding apparatus on a low-carbon steel work piece with an LN2 trailing jet, and transient temperature history was recorded at select points. A finite-element method is used as a solution procedure for IHT method. The heat transfer parameters are estimated by comparing the temperature history at a point from the experiment with the temperature history of the same point in the finite-element model by an iterative method. The heat transfer coefficient, heat flux of LN2 jet, and effective radius of the jet are estimated using two-dimensional and three-dimensional models.
机译：焊接在焊接结构中引起变形和应力。焊接弧后面的散热片是用于减少应力和变形的一种方法。研究人员已将诸如雾化水和液氮（LN2）射流之类的冷却剂用作尾部散热器。由于散热器的加入会改变温度分布，因此估算冷却射流的散热量是研究散热器对应力和变形的影响的前提。由于冲击射流的冷却不均匀，冷却射流的沸腾传热，工件表面上的杂散流体颗粒以及焊接引起的工件上局部温度的急剧变化，估计传热参数的分析方法很复杂。热输入。因此，逆热传递（IHT）方法适用于估算由于散热片引起的热传递参数。使用自动钨极惰性气体保护焊设备在带有LN2尾随射流的低碳钢工件上进行实验，并在选定点记录瞬态温度历史。有限元方法被用作IHT方法的求解过程。通过迭代将实验点的温度历史与有限元模型中同一点的温度历史进行比较，从而估算出传热参数。使用二维和三维模型估算传热系数，LN2射流的热通量和射流的有效半径。

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  • 来源
    《Heat Transfer Engineering》 |2015年第4期|178-185|共8页
  • 作者

    R. S. SUDHEESH; N. SIVA PRASAD;

  • 作者单位

    Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai, India;

    Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600 036, India;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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