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Flow Boiling Heat Transfer Characteristics and Delayed Dry-Out Ability of Non-Azeotropic Mixtures R245fa/R134a in Microchannels

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Journal of Thermal Science 2024年第3期33卷 1174-1188页

作者： LU Yongjie LING Yongjun ZHUANG Yuan LI Chenyang OUYANG Hongsheng han xiaohong Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang Province Institute of Refrigeration and CryogenicsZhejiang UniversityHangzhou310007China Zhejiang Zhongguang Electrical Co. Ltd.Lishui323000China State Key Lab for Fluorine Greenhouse Gases Replacement and Control Treatment Zhejiang Research Institute of Chemical IndustryHangzhou310014China

Microchannel flow boiling heat transfer has the advantages of strong heat dissipation capacity,good temperature uniformity,and compact *** is an excellent way to thermally manage electronic devices,but when the heat flux exceeds CHF(Critical Heat Flux),the heat transfer performance deteriorates as the working fluid dries ***-azeotropic mixtures have the potential to effectively delay or avoid dry-out during the boiling process due to their temperature slide characteristics which causes the mass transfer *** understand the influence of non-azeotropic mixtures on microchannel flow boiling,using the phase-change microchannel heat sink as the research object,the experiments on the flow boiling heat transfer performance of R245fa/R134a mixtures under different working conditions were carried out,and the characteristics of flow boiling heat transfer were obtained under the different working conditions,and comparison was developed with those of pure substance *** results demonstrated that a small amount of low-boiling-point components in the high-boiling-point working fluid inhibited boiling heat transfer to some extent,and lowered the average heat transfer coefficient under the non-dryout condition slightly lower than that of the pure substance;however,it also effectively delayed the onset of local dry-out and prevented significant deterioration in thermal transfer performance under the lower mass flow rate and higher heat flux,which could enhance the heat sink's stability.

关键词： microchannel flow boiling non-azeotropic mixture heat transfer characteristics dry-out

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A New Excess Free Energy Mixing Rule for Representing Vapor-Liquid Equilibria of Mixed Refrigerants

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Journal of Thermal Science 2024年第3期33卷 1161-1173页

作者： YE Gongran FANG Yibo YAN Yuhao LIU Ying OUYANG Hongsheng GUO Zhikai han xiaohong Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang Province Institute of Refrigeration and CryogenicsZhejiang UniversityHangzhou310027China State Key Lab for Fluorine Greenhouse Gases Replacement and Control Treatment Zhejiang Research Institute of Chemical IndustryHangzhou310014China Zhejiang Key Laboratory of Clean Energy and Carbon Neutrality Zhejiang UniversityHangzhou310027China

A suitable mixing rule is important for vapor liquid equilibrium(VLE)investigations for mixed *** this work,a new excess free energy mixing rule(MRv)was proposed at zero pressure based on the linear relationship between dimensionless parameter 1/(u-1)and *** mixing rule was explicit adopted variable liquid molar *** applicable temperature range of MRv could be extended by means of an empirical method to estimate the liquid molar volume for components at high *** mixing rules modified Huron-Vidal mixing rule(MHV1),Wong-Sandler mixing rule(WS),and MRv at two reference pressures were used to compare the VLE data in the calculation of 37 mixed *** demonstrated that MRv had a relatively similar accuracy to MHV1 and WS for component and pressure ***,the average excess Gibbs free energy using the MRv mixing rule for the 37 selected mixed refrigerants(0.0013)was much lower than those using the MHV1(0.0078)and WS(0.0809)mixing rules,which was very valuable for the design and optimization of thermodynamic systems using mixed refrigerants.

关键词： mixed refrigerant vapor liquid equilibrium(VLE) mixing rule reproducibility

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基于决策实验室分析的智慧医疗服务老年患者使用行为影响因素研究

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中国医院管理 2024年第4期44卷 56-60页

作者：韩晓宏孙悦吉林大学第一医院吉林长春130021 长春工程学院吉林长春130012

目的以吉林省某三甲医院智慧医疗系统为例,识别和分析影响智慧医疗服务老年患者使用行为的关键影响因素,为促进智慧医疗服务老年患者使用和智慧医疗服务适老化改造提供依据。方法通过分析智慧医疗服务老年患者使用行为影响因素,运用... 详细信息

目的以吉林省某三甲医院智慧医疗系统为例,识别和分析影响智慧医疗服务老年患者使用行为的关键影响因素,为促进智慧医疗服务老年患者使用和智慧医疗服务适老化改造提供依据。方法通过分析智慧医疗服务老年患者使用行为影响因素,运用决策实验室分析法对影响智慧医疗服务老年患者使用行为的因素进行关联分析。结果对所有影响因素的中心度和原因度进行计算,识别影响智慧医疗服务老年患者使用行为的关键影响因素。其中原因度因素主要有医院适老化改造意愿、关键人群影响和国家相关政策支持,中心度主要因素为患者感知成本。结论从改进智慧医疗服务、提升老年患者健康信息素养和发挥社会支持效应等方面降低老年患者的感知成本,促进老年患者的智慧医疗服务使用行为。

关键词：智慧医疗服务老年患者使用行为影响因素决策实验室分析

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联合异质图卷积网络和注意力机制的假新闻检测

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小型微型计算机系统 2024年第2期45卷 301-308页

作者：韩晓鸿赵梦凡张钰涛河北工程大学信息与电气工程学院河北邯郸056038 天津大学智能与计算学部天津300350

社交媒体平台的开放性和包容性为人们提供了自由的表达方式,但也引发了新的社会问题,假新闻在社交平台层出不穷,会引起公众恐慌,侵害人们的精神健康,这使得假新闻检测尤为必要.现有的假新闻检测方法大多侧重于从文本内容、用户和传播模... 详细信息

社交媒体平台的开放性和包容性为人们提供了自由的表达方式,但也引发了新的社会问题,假新闻在社交平台层出不穷,会引起公众恐慌,侵害人们的精神健康,这使得假新闻检测尤为必要.现有的假新闻检测方法大多侧重于从文本内容、用户和传播模式中挖掘有效信息,但是这些方法没有充分利用文本内容的全局语义关系.为了有效融合新闻内容的全局语义信息和新闻传播的全局结构关系,本文提出一种基于元路径的推文-词-用户异质图卷积注意力框架HGCAN,根据元路径将构建的推文-词-用户异质图分解为两个子图,通过图卷积网络提取传播结构特征,利用注意力机制聚合邻居节点的信息并学习子图重要性,从而有效学习节点的特征表示.在两个公开数据集上的实验结果表明,相比于其他方法,本文方法在准确率和F1指标上都取得了较为先进的结果.

关键词：异质图图卷积网络注意力机制假新闻检测

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An automated pulmonary parenchyma segmentation method based on an improved region growing algorithm in PET-CT imaging

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Frontiers of Computer Science 2016年第1期10卷 189-200页

作者： Juanjuan ZHAO Guohua JI xiaohong han Yan QIANG Xiaolei LIAO College of Computer Science and Technology Taiyuan University of Technology Taiyuan 030024 China Key Laboratory of Advanced Transducers and Intelligent Control Systems Taiyuan University of Technology Taiyuan 030024 China

To address the incomplete problem in pulmonary parenchyma segmentation based on the traditional methods, a novel automated segmentation method based on an eight- neighbor region growing algorithm with left-right scanning and four-corner rotating and scanning is proposed in this pa- per. The proposed method consists of four main stages： image binarization, rough segmentation of lung, image denoising and lung contour refining. First, the binarization of images is done and the regions of interest are extracted. After that, the rough segmentation of lung is performed through a general region growing method. Then the improved eight-neighbor region growing is used to remove noise for the upper, mid- dle, and bottom region of lung. Finally, corrosion and ex- pansion operations are utilized to smooth the lung boundary. The proposed method was validated on chest positron emis- sion tomography-computed tomography （PET-CT） data of 30 cases from a hospital in Shanxi, China. Experimental results show that our method can achieve an average volume overlap ratio of 96.21 ± 0.39% with the manual segmentation results. Compared with the existing methods, the proposed algorithm segments the lung in PET-CT images more efficiently and ac- curately.

关键词： pulmonary parenchyma segmentation bot-tom region of lung image binarization iterative threshold seeded region growing four-corner rotating and scanning,denoising contour refining PET-CT

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腺相关病毒载体基因治疗药物生物分析技术及药代/药效动力学研究进展

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罕见病研究 2024年第3期3卷 350-357页

作者：任建伟郑昕韩晓红中国医学科学院北京协和医院临床药理研究中心、疑难重症及罕见病全国重点实验室、国家药监局药物临床研究与评价重点实验室、创新药物临床PK/PD北京市重点实验室北京100730

腺相关病毒(AAV)载体是近年来基因治疗领域的研究热点,由于其致病能力弱、免疫原性低、组织特异性强等特点,在基因治疗领域展现出了极大的潜力。AAV载体本质上为具有感染活性的病毒,其安全性和有效性需要新的生物分析技术来评估。目前,... 详细信息

腺相关病毒(AAV)载体是近年来基因治疗领域的研究热点,由于其致病能力弱、免疫原性低、组织特异性强等特点,在基因治疗领域展现出了极大的潜力。AAV载体本质上为具有感染活性的病毒,其安全性和有效性需要新的生物分析技术来评估。目前,相关行业指南明确了对AAV载体生物分布、脱落、免疫原性等内容的评估需求,但对生物分析相关的要求却十分有限。本文从生物分布、脱落、免疫原性和药代动力学/药效动力学(PK/PD)研究4个方面对AAV载体基因治疗药物生物分析技术及PK/PD研究面临的挑战进行总结,以期为AAV载体基因治疗产品的临床研发提供参考。

关键词：腺相关病毒生物分析基因治疗生物分布脱落

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Evaporating Temperature Uniformity of the Pulsating Heat Pipe with Surfactant Solutions at Different Concentrations

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Journal of Thermal Science 2023年第1期32卷 183-191页

作者： BAO Kangli WANG Xuehui ZhanG Peng-E han xiaohong TAN Jianming State Key Laboratory of Air-Conditioning Equipment and System Energy Conservation GREE Electric Appliances Inc.of ZhuhaiZhuhai 519070China Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang Province Institute of Refrigeration and CryogenicsZhejiang UniversityHangzhou 310027China

The evaporating section of the pulsating heat pipe(PHP)is in direct contact with the electronics when it is used for heat dissipation,and thus the evaporating temperature uniformity has an important effect on the safe and reliable operation of electronic *** the basis of these conditions,an experimental study on the evaporating temperature uniformity of the PHP with surfactant solutions at different concentrations was conducted at the heat fluxes of(1911–19427)W/m^(2).Sodium stearate was utilized for the solute;the surfactant solutions were prepared with the concentrations of 0.001 wt%,0.002 wt%,and 0.004 wt%,respectively,and the filling ratios of the PHP were 0.31,0.44 and 0.57,*** experimental results revealed that under all tested working conditions,the highest temperature always appeared in the intermediate zone of the evaporating *** the heat flux increased,the temperature differences among different zones rose initially and then reduced due to the change of the flow motion and the flow *** evaporating temperature uniformity of the sodium stearate solutions-PHP was better than that of the deionized water-PHP,which suggested that the evaporating temperature uniformity might be improved through decreasing the surface ***,combined with the effect of surface tension and viscosity,for different filling ratios,the required concentration was different when the best evaporating temperature uniformity was *** be specific,when the filling ratio were 0.31 and 0.44,the best evaporating temperature uniformity was achieved at the concentration of 0.004 wt%,while at the filling ratio of 0.57,the best evaporating temperature uniformity was attained at the concentration of 0.002 wt%.

关键词： pulsating heat pipe surface tension evaporating temperature uniformity heat transfer

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Evaluation on Cycle Performance of R161 as a Drop-in Replacement for R407C in Small-Scale Air Conditioning Systems

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Journal of Thermal Science 2022年第6期31卷 2068-2076页

作者： FANG Yibo WU Mei GUO Zhikai NI hang han xiaohong CHEN Guangming Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang Province Institute of Refrigeration and CryogenicsZhejiang UniversityHangzhou 310027China State Key Lab for Fluorine Greenhouse Gases Replacement and Control Treatment Zhejiang Research Institute of Chemical IndustryHangzhou 310023China

In this work, with excellent environmental characteristics and thermodynamic properties, R161 is considered as a drop-in replacement of R407C used in small-scale air conditioning systems. In order to study the potential of R161 in the application, the theoretical and experimental cycle performances of R161 and R407C were compared under different working conditions. The experimental results agreed well with theoretical results. In the experiment, COPs of R161 were about 15% higher than those of R407C. The compressor power consumptions of R161 were about 18% lower than those of R407C. The discharge temperatures of R161 were about 0-4℃ lower than those of R407C. Besides, the annual electric consumption of a small-scale split air conditioning in Beijing, Shanghai and Hongkong could be reduced by about 19.5%, when the working fluid was changed from R407C to R161. Overall, the results indicated that R161 has a better cycle performance and good compatibility with the existing systems designed for R407C.

关键词： R161 R407C drop-in replacement small-scale air conditioning system

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Experimental Investigation on the Temperature Distribution Characteristics of the Evaporation Section in a Pulsating Heat Pipe

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Journal of Thermal Science 2019年第2期28卷 246-251页

作者： WANG Xuehui GAO Xu BAO Kangli HUA Chao han xiaohong CHEN Guangming State Key Laboratory of Technologies in Space Cryogenic Propellants Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang Province Institute of Refrigeration and Cryogenics Zhejiang University

With the increasing demand for heat dissipation in the electronics industry, pulsating heat pipe(PHP) has attracted wide attention due to its simple structure and excellent heat transfer ability. However, due to the unique operational mechanism of PHP, the temperature distribution in the evaporation section is obviously not even during the operational process of PHP. When the PHP is used as a heat dissipater, the evaporation section of the PHP directly contacts with the chips and has great influence on the performance of the chips, so it is very important to investigate the temperature distribution characteristics in the evaporation section. In this paper, both the effects of the filling ratio and heat flux on these characteristics were investigated. The experimental results indicated that the temperatures of the middle "U" turn were the highest. When the heat flux and the filling ratio were 364 W/cm^2 and 36.3%, respectively, the maximum temperature difference between the middle "U" turn and the other "U" turns could be as high as 18.92 K. Furthermore, the temperature differences between the middle "U" turn and the other "U" turns firstly increased and then decreased with the increase of heat flux and filling ratio.

关键词： temperature distribution pulsating heat pipe oscillation motions heat transfer

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基于平板热管技术的电子器件热管理研究进展

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制冷学报 2024年第3期45卷 1-22,49页

作者：罗松严昱昊叶恭然朱剑杰欧阳洪生肖隆湟韩晓红浙江大学制冷与低温研究所、浙江省制冷与低温技术重点实验室杭州310027 含氟温室气体替代及控制处理国家重点实验室、浙江省化工研究院有限公司杭州310023

随着电子器件不断趋于小型化和高度集成化发展,电子器件功率过高引发的散热问题亟待解决。平板热管由于具有均温性好、散热效率高等优势已为许多大功率电子元器件的散热问题提供了有效的热管理解决方案。但面对如今越来越多元化的散热需... 详细信息

随着电子器件不断趋于小型化和高度集成化发展,电子器件功率过高引发的散热问题亟待解决。平板热管由于具有均温性好、散热效率高等优势已为许多大功率电子元器件的散热问题提供了有效的热管理解决方案。但面对如今越来越多元化的散热需求,开发适应新型电子设备散热需求的高效平板热管仍是当前研究的热点。基于此,在对平板热管工作原理及结构特点进行阐述的基础上,对平板热管的传热性能、影响传热性能的因素(毛细芯结构、腔体厚度、工质、充液率、倾角和热源)、强化平板热管传热性能的措施(不同润湿性表面和支撑柱结构等)及其在小型化电子设备、IGBT晶体管、LED和电池组等电子器件散热应用等方面进行了系统性综述,指出研究不同毛细芯结构与腔体厚度下平板热管内部流动传热特性、散热性能强化的机制和综合优化方法,以及如何在不同电子器件热管理需求下设计出空间适应性强而散热性能高效的平板热管等仍是当前平板热管有待进一步突破的关键技术,将为平板热管在电子器件散热领域的进一步深入研究与优化提供一定参考。

关键词：平板热管临界热流密度表面润湿性强化传热电子器件散热

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