一种铝合金水冷界面换热系数反求方法的研究

A method of inverse evaluation for interface heat transfer coefficient between aluminium alloy and cooling water

针对水冷金属界面换热系数影响因素多，测量与求解难的问题，以温度场数学模型为基础，以实测温度曲线为基准，通过数值模拟迭代计算和自动寻优，实现了铝合金水冷界面换热系数随温度变化定量关系的反求。反求得到的铝合金换热系数结果表明：在浸入式水冷过程中，铝合金界面换热系数随表面温度由低到高呈现出先升后降的单峰形状特征，降低冷却水的温度会使换热系数的峰值点升高，但不会改变峰值点出现的温度范围，换热系数的最大值出现在200～230℃。金属与冷却水之间热交换的强度主要取决于界面温度，将界面温度控制在200—230℃会使强化传热效果达到最佳。

Heat transfer coefficient between metallic materials and cooling water is affected by many factors, and is also difficult of measurement. Based on mathematical model and measured temperature curves, the quantitative correlation of temperature and heat transfer coefficient was obtained in inverse algorithm through iterative simulating and optimizing automatically. The results show that the heat transfer coefficient is increases to a single peak at the beginning and then decreased with increasing temperature in submerged cooling water process. As decreasing temperature of the cooling water, the peak value of the heat transfer coefficient increases. However, the temperature range of the peak value, which ranges from 200℃ to 230℃, does not change any more. The heat transfer intensity is mainly owing to the interracial temperature between the aluminium alloys and the cooling water, the temperatures range form 200℃ to 230℃ is the best one.