水蒸气在蛇管内的环状流冷凝

Condensation of Steam Inside Helical Tubes Within Annular Flow Region

本文对蛇管内环状流冷凝传热进行了理论分析,在所建立的模型中考虑了由于二次流的存在而产生圆周方向的剪力,并在剪力控制和接近剪力控制的条件下,测定了蛇管内水蒸气冷凝传热膜系数及两相流动压降,传热模型与实验值符合良好.

Condensation heat transfer and two-phase flow in the annular region inside helical tubes were analyzed. The effect of circumferential shear resulted from secondary flow was considered and a physical model of heat transfer was established. Heat transfer coefficients and two-phase flow pressure drops during steam condensation inside helical tubes in the regimes controlled or mainly controlled by shear were measured experimentally. The heat transfer coefficients calculated from the physical model were found to be in good agreement with the experimental results.