负压蒸汽横向冲刷转角正方型管束降膜流动的压降实验
刘华,沈胜强博士点基金项目(201**********).
通讯作者,******@dlut.
,陈石,龚路远,冯寅,刘瑞,陈学
大连理工大学辽宁省海水淡化重点实验室,辽宁大连 116024
Email:******@.,电话:**********
摘要:建立了蒸汽横掠大型降膜流动水平管束流动阻力特性实验台,对两相流流动阻力压降性能进行系统研究。蒸汽从实验台一侧流入横向冲刷管束,饱和水从实验台顶部喷淋,实验在绝对压力为12—31kPa的真空条件下进行,对应饱和温度为50—70 ºC,模拟大型水平管降膜蒸发器的流动过程并分析饱和温度和喷淋密度对管束间两相流动阻力的影响。实验结果显示,蒸汽掠过水平降膜管束的流动阻力远大于横掠水平管束。给出了一定雷诺数范围内转角正方型管束的单相摩察系数拟合公式。
关键词:压降;水平管束降膜流动;饱和温度;海水淡化
Experiment study of steam pressure drop through horizontal tube bundle in rotated square arrangement with falling film at vacuum condition
LIU Hua, SHEN Shengqiang, CHEN Shi, GONG Luyuan, FENG Yin, LIU Rui and CHEN Xue
(Key Laboratory for Sea Water Desalination of Liaoning Province, Dalian
University of Technology, Dalian 116024, Liaoning, China)
Abstract: An experiment investigation of two-phase flow resistance in large horizontal falling film tube bundle with steam flow across test bench in a systematic study is presented. Experiments are performed at a system pressure from 12 kPa to 31kPa and saturation temperatures from 50ºC to 70ºC accordingly, with vapor flowed from one side and water sprayed from the top which is simulated to actual status in large scale falling-film evaporator. The saturated temperature and spray density are analyzed about the effect on the two-phase flow resistance on horizontal tube bundle. The results indicate that the pressure d
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