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采用加湿热空气模拟燃气锅炉的尾部烟气,通过热管换热器进行对流冷凝传热实验研究;并利用十八烷基硫醇形成的分子自组装膜对热管表面进行改性,从而强化冷凝传热。实验在较大的加湿热空气温度(70～120℃)和水蒸气体积分数(0%～20%)范围内进行,主要研究了对流冷凝传热的影响因素和分子自组装膜的强化效果。实验结果表明:水蒸气体积分数、加湿热空气的质量流量和入口温度是影响对流冷凝传热的主要因素,拥有分子自组装膜的改性表面对冷凝传热有极好的强化作用。
Adopting humidified hot air to simulate the tail flue gas of the gas boiler, convection and condensation heat transfer experiments were conducted by the heat pipe heat exchanger. The surface of the heat pipe was modified by the molecular self-assembled film formed by octadecanethiol, heat. Experiments were conducted in the range of larger humidified hot air temperature (70 ~ 120 ℃) and water vapor volume fraction (0% ~ 20%), and the influencing factors of convective heat transfer and the strengthening effect of molecular self-assembled membranes were mainly studied. The experimental results show that the main factors affecting the heat transfer in convective condensation are water vapor volume fraction, mass flow rate of humidified hot air and inlet temperature. The modified surface with molecular self-assembled membranes has an excellent reinforcing effect on condensation heat transfer.