自然循环窄矩形通道ONB点未确知数学建模研究

Study on Model of Onset of Nucleate Boiling under Natural Circulation in Narrow Rectangular Channel by Using Unascertained Mathematics

过冷沸腾起始点是自然循环流动换热中的关键特征点。基于未确知数学原理,利用所搭建的自然循环实验台架取得实验数据,建立矩形窄通道过冷沸腾起始点(ONB点)未确知热流密度数学模型。通过进行未确知数学计算结果分析,划分出可用区间、置疑区间、剔除区间。结果表明,未确知数学模型能更好地处理未确知信息,增强对实验值的表达,有效地对ONB点热流密度进行准确、全面的描述。

Onset of nucleate boiling （ONB） is the key point of the flow boiling heat transfer process under natural circulation. According to the experimental data, the paper obtains the unascertained mathematical model of ONB＇s heat flux in narrow rectangular channel based on the theory of unascertained mathematics. The paper analyzes the results of the calculation, then gets three sections： Available, Checkable, Rejectable. The result shows that the unascertained mathematical model is good at dealing with the unascertained information, can enhance the understanding of the experimental data, obtain an accurate and complete description on ONB＇s heat flux.