竖直上升管中超临界水的宽范围换热关联式

摘要

本文针对超临界压力水在竖直上升管内的传热工况,广泛搜集公开文献中的实验数据,建立并整理了宽范围实验数据库；引入两组无量纲数表征超临界流体强烈物性变化及其次级效应对传热的影响,基于无量纲数敏感性分析与多重共线性评估,采用主成分分析回归建立了两种形式的宽范围换热关联式；对两个关联式进行评价,并与其他关联式进行比较,这两个关联式在适用范围、误差大小和准确度方面均优于其他关联式.%Available experimental data of forced convective heat transfer of supercritical water in vertical upward channels are extensively collected to establish a wide-ranged data bank in this paper. Two groups of dimensionless number are introduced to reflect special influence on heat transfer which are induced by the drastic variation of supercritical water properties and related secondary effects. Based on sensitivity analysis and multi-collinearity evaluation of the dimensionless numbers, two types of wide-ranged heat transfer correlations are regressed through principal component analysis. Further, the two correlations developed are assessed using the wide-ranged data bank in comparison with various other correlations. It is concluded that the two correlations developed are superior to others in applicable range, error and accuracy aspects.