Experimental Research on Single-Phase Heat Transfer Characteristics in a Vertical Circular Tube under Marine Conditions
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摘要: 进行了海洋条件下圆管内的强迫循环传热实验,通过测量竖直圆管周向的温度分布,从而得到海洋条件下不同位置的传热系数。实验结果表明:倾斜时,靠近上侧管壁附近的传热减弱,而靠近下方的管壁处传热增强;摇摆时,垂直于摇摆轴方向的管壁处传热会发生周期性振荡。采用计算流体力学(CFD)方法对海洋条件下单相传热问题进行了数值模拟,计算结果与实验结果一致。分析结果表明:倾斜时影响传热的主要因素是浮力;摇摆时影响传热的最主要因素是科里奥利力。Abstract: Experiments have been conducted to study the heat transfer characteristics of single-phase forced circulation when the test tube was under different marine conditions.The experiments measured the wall temperature of test tube to calculate the heat transfer coefficients at different circumferential places.When the test tube was under inclined conditions,the heat transfer coefficient increased at downside and decreased at upside of test tube because of buoyancy effect.When the test tube was under rolling conditions,the heat transfer coefficients fluctuated with the rolling motions,and the Coriolis force dominated the heat trans-fer fluctuation during the rolling motion.CFD method was used to simulate the heat transfer phenomena under marine conditions,and the results were accord to the experimental phenomena.
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Key words:
- Heat transfer coefficient /
- Inclination /
- Rolling /
- Buoyancy /
- Coriolis force
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