Estimation of the time-dependent convective boundary condition in a horizontal pipe with thermal stratification based on inverse heat conduction problem

Estimation of the time-dependent convective boundary condition in a horizontal pipe with thermal stratification based on inverse heat conduction problem
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基于热传导反问题的热分层水平管道中瞬态对流边界条件估计

DOI:
10.1016/j.ijheatmasstransfer.2018.02.119
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发表时间:
2019-04
影响因子:
5.2
通讯作者:
T. Lu
T. Lu
中科院分区:
工程技术2区
文献类型:
--
作者:
W.W. Han;H.B. Chen;T. Lu

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在具有温度分层的管道中,内壁上的时变对流边界条件是导致管道热疲劳的流动和传热的根本原因。本文提出了一个三维瞬态热传导反问题,用于同时估计含时对流边界条件的多个变量。选择共轭梯度法作为优化方法。IHCP中的已知参数是外壁上的测量温度。在不同的七个操作条件下进行了实验,以验证该方法。在此基础上,讨论了冷水体积流量对试验段内近壁面导热系数和管壁温度分布的影响。
The time-dependent convective boundary condition on the inner wall are the essential causes of flow and heat transfer that induce thermal fatigue in pipes with thermal stratification. A three-dimensional transient inverse heat conduction problem (IHCP) was developed in this work for estimating simultaneously the multi-variables of the time-dependent convective boundary condition. Conjugate gradient method (CGM) is chosen as the optimization method. The known parameter in the IHCP is the measuring temperature on the outer wall. Experiments under different seven operating conditions have been taken for the validation of the method. Based on the estimated results, the influence of volume flow rate of cold water on the conductive heat transfer coefficient near the inner wall in the test section and the temperature distribution of the pipe wall were discussed.
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