摘要
为探索真空环境下,气泡在溶液吸收过程中流动、传热特性及其机理,设计了一种增压型垂直管内溶液鼓泡吸收输运特性测量实验装置,并介绍了该装置的结构和工作原理,通过系统真空度维持、气泡流动和能量校核等实验分别验证系统的可靠性和准确性。结果表明,增压技术实现了负压环境下的鼓泡吸收。静置12 h系统真空度上升率仅为2.33%,系统气体泄漏量为2.4 mL/h,装置具有良好的可靠性。实验过程中的气泡产生、上升、碰撞、聚并和破裂行为与文献气泡流动行为一致。溶液和冷却水的出口温度、溶液出口质量分数测量结果最大相对偏差分别为0.08%、0.02%和0.01%;不同溶液入口温度和溶液流量的能量校核实验的最大误差分别为10.4 J和12.5 J,装置具有良好的准确性。为探究真空环境下鼓泡吸收的输运特性及揭示其传递机理奠定了良好的实验基础。
To evaluate the thermal-hydraulic characteristics and mechanism of the bubble absorption process inside a solution in a vacuum environment,we design an experimental device for measuring the bubble absorption and transport characteristics of solutions in a pressurized vertical tube and introduce the structure and work of the device.Its reliability is verified by system vacuum pressure experiments,and its accuracy is verified by bubble flow and energy conservation experiments.The results show that pressurization technology achieves bubble absorption in a vacuum environment.The vacuum increase rate of the system is only 2.33%after 12 h of idling,corresponding to a gas leakage rate of 2.4 mL/h.The device exhibited good reliability.The behavior of bubble generation,rising,collision,coalescence,and rupture during the experiment was consistent with the bubble flow behavior reported in the literature.The maximum relative deviations in the outlet temperature and outlet concentration of the solution and cooling water were 0.08%,0.02%,and 0.01%,respectively.The maximum errors of the energy calibration experiment of the different solution inlet temperatures and solution flow rates are 10.4 J and 12.5 J,respectively,and thereby the device has good accuracy.The experimental device provides a good experimental foundation for evaluating the transport characteristics of bubble absorption and the heat transfer characteristics of bubble absorption in a vacuum environment and revealing its transfer mechanism.
作者
李季桐
王刚
熊亚选
张群力
Li Jitong;Wang Gang;Xiong Yaxuan;Zhang Qunli(Beijing Key Laboratory of Heating,Gas Supply,Ventilation and Air Conditioning Engineering,Beijing University of Civil Engineering and Architecture,Beijing,100044,China;Beijing Building Energy Efficient Comprehensive Utilization Engineering Center,Beijing,100044,China)
出处
《制冷学报》
CAS
CSCD
北大核心
2024年第2期127-134,共8页
Journal of Refrigeration
基金
国家自然科学基金(52070012)资助项目
北京建筑大学-市属高校基本科研业务费项目(X23029)资助。
关键词
增压
鼓泡吸收
流动
传热
实验装置
pressurized
bubble absorption
flow
heat transfer
experimental device
