Yu Peng, Li Ruiqing, Bie Dapeng, Liu Xiancai, Yao Xiaomin, Duan Yahui
Hubei Institute of Water Resources Survey and Design, Wuhan 430070, China.
State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China.
Materials (Basel). 2021 Sep 8;14(18):5142. doi: 10.3390/ma14185142.
For a long time, temperature control and crack prevention of mass concrete is a difficult job in engineering. For temperature control and crack prevention, the most effective and common-used method is to embed cooling pipe in mass concrete. At present, there still exists some challenges in the precise simulation of pipe cooling in mass concrete, which is a complex heat-flow coupling problem. Numerical simulation is faced with the problem of over-simplification and inaccuracy. In this study, precise simulation of heat-flow coupling of pipe cooling in mass concrete is carried out based on finite element software COMSOL Multiphysics 5.4. Simulation results are comprehensively verified with results from theoretical solutions and equivalent algorithms, which prove the correctness and feasibility of precise simulation. Compared with an equivalent algorithm, precise simulation of pipe cooling in mass concrete can characterize the sharp temperature gradient around cooling pipe and the temperature rise of cooling water along pipeline more realistically. In addition, the cooling effects and local temperature gradient under different water flow (0.60 m/h, 1.20 m/h, and 1.80 m/h) and water temperature (5 °C, 10 °C, and 15 °C) are comprehensively studied and related engineering suggestions are given.
长期以来，大体积混凝土的温控防裂一直是工程中的一项难题。对于温控防裂，最有效且常用的方法是在大体积混凝土中埋设冷却水管。目前，大体积混凝土中冷却水管冷却的精确模拟仍存在一些挑战，这是一个复杂的热流耦合问题。数值模拟面临着过度简化和不准确的问题。本研究基于有限元软件COMSOL Multiphysics 5.4对大体积混凝土中冷却水管的热流耦合进行精确模拟。模拟结果与理论解和等效算法的结果进行了全面验证，证明了精确模拟的正确性和可行性。与等效算法相比，大体积混凝土中冷却水管的精确模拟能够更真实地刻画冷却水管周围急剧的温度梯度以及冷却水温沿管道的升高情况。此外，还全面研究了不同水流速度（0.60 m/h、1.20 m/h和1.80 m/h）和水温（5℃、10℃和15℃）下的冷却效果和局部温度梯度，并给出了相关工程建议。
