化工学报2019，Vol.70Issue(7)：2488-2495,8.DOI:10.11949/j.issn.0438-1157.20181491
并联双通道内超临界水的脉动传热特性
Oscillatory heat transfer characteristics of supercritical water in parallel channels
摘要
Abstract
The oscillatory heat transfer characteristics of supercritical water in vertical upward parallel channels were experimentally investigated under the condition of pressure from 26—30 MPa, time-averaged mass flow rate of 420 kg·m-2·s-1 and heat flux from 0—130 kW·m-2. According to the experimental results, the effects of mass flow rate oscillation on wall temperature, oscillatory amplitude ratio ( Af ) and oscillatory frequency number ( Wo ) on time-averaged Nusselt number were analyzed, and the time-averaged Nu of oscillatory flow was compared with the supercritical heat transfer correlation equations. The results show that the wall temperature fluctuates with mass flow rate oscillation at the same oscillatory period and opposite phase, and the larger amplitude of mass flow rate oscillation leads to the stronger fluctuation of wall temperature. At the occurrence of low frequency oscillation, the time-averaged Nu decreases with the increase of oscillatory amplitude ratio, and decreases firstly with the increase of oscillatory frequency number and then remains constant. At the occurrence of high frequency oscillation, the time-averaged Nu increases slowly with the increase of oscillatory amplitude ratio, and decreases with the increase of oscillatory frequency number. The values of Nu predicted by correlations is generally higher than that of experiments.关键词
超临界水/传热/上升管/脉动振幅率/脉动频率数/壁温脉动Key words
supercritical water/heat transfer/riser/oscillatory amplitude ratio/oscillatory frequency number/oscillation of wall temperature分类
能源科技引用本文复制引用
LIANG Ziyu,WAN Li,LI Juan,ZHOU Xihong,YANG Dong..并联双通道内超临界水的脉动传热特性[J].化工学报,2019,70(7):2488-2495,8.基金项目
国家重点研发计划项目(2016YFB0600201) （2016YFB0600201）
