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作 者:王兴社 申海川 赵贯甲[1,3] 王剑飞 尹建国 马素霞[1] Wang Xingshe;Shen Haichuan;Zhao Guanjia;Wang Jianfei;Yin Jianguo;Ma Suxia(College of Electrical and Power Engineering,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China;China State Shipbuilding Corporation Limited 703 Research Institute,Harbin 150078,Heilongjiang,China;Key Laboratory of Cleaner Intelligent Control on Coal&Electricity,Ministry of Education,Taiyuan 030024,Shanxi,China;Shanxi Key Laboratory of High Efficiency Heat Storage and Low Carbon Heat Supply,Taiyuan 030038,Shanxi,China)
机构地区:[1]太原理工大学电气与动力工程学院,山西太原030024 [2]中国船舶集团有限公司第七〇三研究所,黑龙江哈尔滨150078 [3]煤电清洁智能控制教育部重点实验室,山西太原030024 [4]高效储热与低碳供热山西省重点实验室,山西太原030038
出 处:《光学学报》2025年第1期265-272,共8页Acta Optica Sinica
基 金:国家自然科学基金(51976132);山西省基础研究计划资助项目(202103021224078)。
摘 要:在微尺度条件下,流体的比表面积增加,表面张力影响显著增强,对界面传热传质以及流动控制均产生影响。流体的表面张力是微流控设计的关键热物理参数,在原位条件下获取该物理量至关重要。研制了一种可以在微尺度条件下精确测量流体界面性质的反射式表面光散射实验系统,并利用参考物质异辛烷、正癸烷和十六烷对新研制的实验系统进行了检验,结果验证了新系统在不同微米尺度下表面张力测量的精确性和可靠性。Objective At the microscale,the increased surface area-to-volume ratio greatly enhances the effect of surface forces,making them essential for fluid control.In mixed systems,the composition of the interfacial layer often differs substantially from that of the bulk phase.While this difference has minimal influence on surface tension measurement at the macroscopic scale,where the interfacial layer's thickness is comparable to the amplitude of surface waves,it becomes critical at the microscopic scale.Surface tension,a macroscopic thermophysical property,depends not only on the free energy at the interface but also on the adsorption of solute molecules in the adjacent interfacial layer.Thus,microscale variations play a crucial role in surface adsorption,necessitating the study of methods to measure liquid surface tension in microchannels under in situ conditions.Methods In this paper,we propose a novel experimental system designed for light scattering on reflective surfaces,with adjustable micrometer-scale channel widths.In addition,a microscale liquid level control platform is developed,incorporating three-dimensional motion and a rotary stage that rotates along the z-axis to control dimensions in the x,y,z,and φ directions.Precise movement in the x-direction is achieved using a one-dimensional digital displacement stage,which offers a stroke of 25.4 mm and a step accuracy of 1 μm.This system enables the creation of microchannels ranging from 10 to 100 μm in width,with the capability to continuously vary channel dimensions by several micrometers.The power spectrum equation for surface waves in microscale channels is derived based on strict boundary conditions.Surface tension is determined by applying this equation to the channel data,following time-domain data processing techniques such as zero-channel-point acquisition,data folding,and discrete fast Fourier transform.Results and Discussions The power spectra of surface waves confined within microchannels of different widths at 298.15 K and atmospheric pressure
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