Li Jie, Zhao Xianming, Zhang Hongliang, Li Dezhi
The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, 110819, People's Republic of China.
Sci Rep. 2024 Feb 29;14(1):4965. doi: 10.1038/s41598-024-55567-8.
In this paper, numerical simulations of single-jet impingement cooling and double-jet impingement cooling processes of heated L-shaped steel are carried out using the VOF model. The SIMPLEC pressure-velocity coupling algorithm and realizable k-ε model are used for the solution. The effects of jet position, water flow, and jet distance in the single-jet condition are analyzed in the simulations. The distributions of impact pressure, turbulence kinetic energy, and Nusselt number were obtained, as well as the variation of the peak values of these three factors with the jet position, water flow, and jet distance. The water flow rate is 3-11 L/min, and the jet distance is 5-25 cm. The effect of the distance between the two nozzles on the jet cooling uniformity under the dual jet condition was also analyzed. The distance between the two nozzles was 15-45 mm. The results showed that the variation of water flow rate had a greater effect on the ability of jet cooling compared with the jet position and jet distance, and the heat transfer efficiency also increased gradually with the increase of water flow, but the increased rate of heat transfer efficiency decreased gradually. When the flow rate increased from 3 to 11 L/min, the maximum instantaneous cooling rates at 1/4 of the thickness of the short side upper side, long side upper side, short side lower side, and long side lower side positions increased by 38.9%, 48.5%, 48.2%, and 32.9%, respectively. To ensure that the jet does not shift, the jet distance should be less than or equal to 10 cm. In the case of the double jet, the nozzle distance is 1.5 cm, and the cooling uniformity of the cooling area between the two nozzles is better. The peak Nusselt number in the cooling area of each part under the double jet cooling condition increased by 5%, 9.4%, 10.2%, and 13.3%, respectively, compared with the single jet.
本文采用VOF模型对加热L形钢的单射流冲击冷却和双射流冲击冷却过程进行了数值模拟。采用SIMPLEC压力-速度耦合算法和可实现的k-ε模型进行求解。模拟分析了单射流条件下射流位置、水流量和射流距离的影响。获得了冲击压力、湍动能和努塞尔数的分布，以及这三个因素的峰值随射流位置、水流量和射流距离的变化。水流量为3-11L/min，射流距离为5-25cm。还分析了双射流条件下两个喷嘴之间的距离对射流冷却均匀性的影响。两个喷嘴之间的距离为15-45mm。结果表明，与射流位置和射流距离相比，水流量的变化对射流冷却能力的影响更大，传热效率也随着水流量的增加而逐渐提高，但传热效率的增加速率逐渐降低。当流量从3L/min增加到11L/min时，短边上侧、长边上侧、短边下侧和长边下侧位置厚度的1/4处的最大瞬时冷却速率分别增加了38.9%、48.5%、48.2%和32.9%。为确保射流不偏移，射流距离应小于或等于10cm。在双射流情况下，喷嘴距离为1.5cm，两个喷嘴之间冷却区域的冷却均匀性较好。与单射流相比，双射流冷却条件下各部分冷却区域内的努塞尔数峰值分别提高了5%、9.4%、10.2%和13.3%。
