Study on the Effects of Tube Diameter and Inclination Angle on the Condensation Heat Transfer of Air-Containing Steam Outside the Tube Bundle
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摘要: 通过对不同管径和倾角的3×3管束开展管外含空气蒸汽冷凝试验，研究了传热管管径和倾角影响管束外含空气蒸汽冷凝传热的基本规律。结果表明：管径和倾角的影响在不同压力范围内具有明显差异。在压力0.8 MPa以下，冷凝传热系数总体随管径和倾角的减小而增大，管径12 mm、0°倾角传热管的冷凝传热系数较管径19 mm、90°倾角的冷凝传热系数最大可增加29%。在压力0.8 MPa以上，冷凝传热系数随管径的减小而减小，最大可降低18%；随倾角的减小先减小后增大，在约60°倾角时，冷凝传热系数最小。Abstract: Through condensation tests of air-containing steam outside the tube against the 3×3 tube bundle with different tube diameters and inclination angles, the basic laws of heat transfer tube diameter and inclination angle affecting the condensation heat transfer of air-containing steam outside the tube bundle are studied. The results show that the effects of tube diameter and inclination angle are significantly different in different pressure ranges. At pressures below 0.8 MPa, the condensation heat transfer coefficient increases with the decrease of tube diameter and inclination angle, and the condensation heat transfer coefficient of 12 mm and 0° inclination angle heat transfer tube is 29% higher than that of 19 mm and 90° inclination angle. At pressures above 0.8 MPa, the condensation heat transfer coefficient decreases with the decrease of the tube diameter, up to 18%; with the decrease of the inclination angle, the condensation heat transfer coefficient first decreases and then increases, and the condensation heat transfer coefficient is the smallest at an inclination angle of about 60°.
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图 2 不同管径下传热管束冷凝传热系数（θ=90°）
Figure 2. Condensation Heat Transfer Coefficient of Heat Transfer Tube Bundle under Different Tube Diameters (θ=90°)
图 3 不同管径下传热管束冷凝传热系数（θ=30°）
Figure 3. Condensation Heat Transfer Coefficient of Heat Transfer Tube Bundle under Different Tube Diameters (θ=30°)
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