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Thermal effect and optimal design of cooling pipes on mass concrete with constant quantity of water flow
Numerical Heat Transfer, Part A: Applications ( IF 2 ) Pub Date : 2020-08-21 , DOI: 10.1080/10407782.2020.1805222
Yongxing Hong 1, 2 , Ji Lin 1 , Kambiz Vafai 2
Affiliation  

Abstract To study the heat transfer of pipe cooling process in concrete, an effective model combined with a radial basis function collocation method (RBFCM) is proposed. In this model, a replicable fictitious structure is imported that allows a set of fixed points to supersede the complicated adaptive remeshing or redistributing points, which significantly saves a lot of time and effort in the pre-processing of the numerical algorithm. Moreover, a relation between the mean temperature of water flow and the heat flux is derived from a heat balance equation. The validity of the proposed model is demonstrated in simulation of a typical three-dimensional problem. Numerical solutions are compared with those obtained by the finite element method and some experimental data. To find the optimum design, 32 cases involving 1 to 7 pipes under certain constraints are considered as follows: the quantity of water flow remains unchanged, the volume occupied by pipes keeps the same, and the same initial temperature of water is used for cooling. Since number, size, and positions of pipes are always changing during the design process, the ability of this approach is further illuminated. Finally, the effect of water flow with several conversing frequencies is investigated. As expected, the maximum temperature difference in concrete can be further controlled by enlarging conversing frequency. Numerical results reveal that the optimal design of pipe cooling system can not only minimize temperature, but also control temperature difference of the concrete structure. The process of design is useful for guidance of engineering practice to improve the structural safety and the economy of the whole building process.

中文翻译:

等流量大体积混凝土冷却管的热效应及优化设计

摘要 为研究混凝土管道冷却过程的传热,提出了一种结合径向基函数配置法(RBFCM)的有效模型。在该模型中,引入了一个可复制的虚拟结构,允许一组固定点取代复杂的自适应重新网格化或重新分布点,这大大节省了数值算法预处理的大量时间和精力。此外,水流的平均温度与热通量之间的关系是从热平衡方程导出的。所提出模型的有效性在一个典型的三维问题的模拟中得到了证明。数值解与有限元方法和一些实验数据得到的结果进行了比较。为了找到最佳设计,1~7根管子在一定约束条件下的32种情况考虑如下:水流量保持不变,管子所占体积保持不变,使用相同的初始水温进行冷却。由于管道的数量、尺寸和位置在设计过程中一直在变化,因此进一步阐明了这种方法的能力。最后,研究了具有多个转换频率的水流的影响。正如预期的那样,通过增大转换频率可以进一步控制混凝土中的最大温差。数值结果表明,管道冷却系统的优化设计不仅可以最大限度地降低温度,而且可以控制混凝土结构的温差。
更新日期:2020-08-21
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