AN INVESTIGATION ON HEAT TRANSFER CHARACTERISTICS OF STEAM-WATER AT DIFFERENT PRESSURE IN VERTICAL UPWARD TUBE
Within the range of pressure from 9 to 30 MPa, mass velocity from 600 to 1200kg/(m<2>.s), and heat flux at inner wall from 200 to 600kW/m<2>, experiments have been performed to investigate the heat transfer characteristics of steam-water two-phase flow in vertical upward tube with an outer diameter of 32mm, and the wall thickness of 3mm. Based on the results, it was found that Dryout is the main mechanism of the heat transfer deterioration in the sub-critical pressure region. Near the critical pressure, when the heat transfer deterioration occurs, the steam quality of water is lower than that in the sub-critical pressure region, so that DNB is the main mechanism in this pressure region. At supercritical pressure, the heat transfer performance in circular channel is better and enhanced, and heat transfer deterioration phenomena is observed when the fluid bulk temperature approaches to the pseudo-critical value.
Heat transfer steam-water supercritical pressure vertical upward tube circular channel heat transfer deterioration
Zhu X.J. Bi Q.C. Chen T.K.
State Key Laboratory of Multiphase Flow in Power Engineering Xian Jiao Tong University Xianning West Road, Xian 710049, China
国际会议
上海
英文
393-397
2007-03-12（万方平台首次上网日期，不代表论文的发表时间）