山东大学学报 (工学版) ›› 2020, Vol. 50 ›› Issue (6): 129-134.doi: 10.6040/j.issn.1672-3961.0.2020.295
• • 上一篇
闫吉庆1,王效嘉2,田茂诚2
YAN Jiqing1, WANG Xiaojia2, TIAN Maocheng2
摘要: 为了在含不凝气蒸汽凝结过程中获得更高的热效率,提出新型锯齿形强化板并建立其二维模型,使用Fluent软件对锯齿形强化板和相同规格波纹板的凝结传热特性进行对比研究。建立可同时计算不凝气层及液膜层的凝结传热模型并在数值模拟中通过用户自定义函数进行编译,模型的可靠性通过和相同工况下的试验进行对比得到验证。数值模拟得到两种板型表面的两相流动及热质交换特征,发现相比于波纹板,锯齿形板能够显著提高不凝气层的紊流度,利于相界面处传热传质过程的进行;锯齿形板的液膜会在波节的齿峰处产生周期性的断裂后在下游壁面上重新形成并在波谷处达到最大厚度;相比于波纹板,在所研究工况内锯齿形板的换热能力总体提高60%以上。
中图分类号:
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