摘要
在较宽广的参数范围内对卧式螺旋管内水／水蒸汽两相流沸腾传热特性进行了详细的试验研究，螺旋管内径ｄ＝１１ｍｍ，曲率直径比Ｄ／ｄ为２３．２７。试验参数范围：压力０．５－３．０ＭＰａ：质量流速２００－２５００ｋｇ／ｍ２·ｓ；热负荷２３０－５００ｋＷ／ｍ２：出口干度０－０．８６。得到了沸腾传热系数的实验关联式，并深入分析了局部传热与壁温特性，沿流动方向，管截面平均传热系数在螺旋管的上升段最大，而在下降段最小；沿管截面内表面圆周方向上，局部传热系数在外侧最大，在内侧最小，在顶部和底部处的值居中。得到了管截面局部传热系数的分布实验关联式。同一管截面外表面圆周方向上，外侧壁温最低而内侧最高。
ln this paper, the convective boiling heat transfer characteristics of water and steam two- phase flow in the horizontal helically coiled tubes was experimentally studied in detail . The inner diameter of the tube is 11 mm and the diameter ratio of the coil to the tube 23. 27 . The experi - mental pressure is ranged from 0. 5 to 3. 0 MPa, mass flowrate from 200 to 2500 kg/m2·s, heat flux from 230 to 500
出处
《核科学与工程》
CAS
CSCD
北大核心
1997年第4期302-308,共7页
Nuclear Science and Engineering
基金
国家自然科学基金
关键词
卧式螺旋管
流动沸腾
传热系数
两相流
换热器
m2 , and outlet steam quality from 0 to 0.86 . The correlation was ob- tained to calculate the average heat transfer coefficient . The distributions of the local heat transfer coefficient and the tube wall temperature were analyzed in detail . Along the t
