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Experimental Investigation on Flow Pattern and Bubble Behavior during Subcooled Flow Boiling of R1233zd(E)in Parallel Channels

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Journal of Thermal Science 2023年第6期32卷 2374-2385页

作者： fang yidong ZHANG Zhao XU Dan WANG Yuchen YANG Huinan HUANG Yuqi School of Energy and Power Engineering University of Shanghai for Science and TechnologyShanghai200093China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering Shanghai200093China Key Laboratory of Clean Energy and Carbon Neutrality of Zhejiang Province Jiaxing Research InstituteZhejiang UniversityJiaxing314031China Key Laboratory of Smart Thermal Management Science&Technology for Vehicles of Zhejiang Province Taizhou317200China

In this study,the flow pattern and bubble behavior of R1233zd(E)during subcooled flow boiling in parallel channels are experimentally investigated with visualization and thermal *** test section is composed of 21 rectangular mini channels with the hydraulic diameter of 1.5 mm and the length of 140 *** flow,slug flow,churn flow and wavy-annular flow occur in sequence with the increase of vapor quality,while transient flow pattern transition process involving multiple flow patterns are also *** distribution of flow pattern is non-synchronized and axial-asymmetric,with earlier flow pattern transitions observed in peripheral channels away from the center *** initial nucleate site in each channel also show a random and axial-asymmetric distribution,while faster bubble growth can be noted in some channel under the comprehensive effects of liquid evaporation and bubble *** variation of heat transfer coefficient is correspondence to the flow pattern transition,showing different trends along the flow *** increase of mass flux can lead to delayed flow pattern transition and variation of heat transfer *** addition,higher heat transfer coefficient can be noted in channels away from the center axis.

关键词： flow boiling flow pattern bubble behavior parallel channel visualization

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Investigation on the Transient Thermal Performance of a Mini-Channel Cold Plate for Battery Thermal Management

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Journal of Thermal Science 2021年第3期30卷 914-925页

作者： fang yidong SHEN Jiali ZHU Yue YE Fei LI Kang SU Lin School of Energy and Power Engineering University of Shanghai for Science and TechnologyShanghai 200093China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering Shanghai 200093China

Cold plate is an important component for a liquid battery thermal management *** order to study the transient thermal performance of the cold plate under conditions with sharply increasing heat loads,the numerical model of a battery cold plate is *** validation experiment shows that the error between the simulation and experiment is around 2.5%to 5%.Effects of the coolant flow rate,the increase in heat flux,and the channel number are analyzed to study the transient thermal performance of the cold *** show that the average temperature of the cold plate at 540 s is lowered from 28.3℃ to 26.9℃ when the coolant flow rate is raised from 0.065 kg/s to 0.165 kg/*** temperature deviation is decreased when the coolant flow rate is increased from 0.065 kg/s to 0.115 kg/s;however,it is slightly increased if the coolant flow rate is further *** average temperature and temperature deviation are raised if the final heat flux is increased from11000 W/m^(2) to 16500 W/m^(2),which are 2 and 3 times of the initial,*** addition,increasing the channel number has slightly positive effect on the average temperature of the cold plate,while the temperature deviation is increased when the channel number is increased from 3 to 11 due to the non-uniform velocity distribution between each *** results of this study will be helpful during the design of cold plate for battery thermal management,especially for transient conditions with sudden rising heat loads like thermal runaway.

关键词： battery thermal management cold plate transient analysis temperature distribution mini-channel

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竖直多波纹板式换热器内R134a的流动沸腾实验研究

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化学工程 2024年第8期52卷 55-59,89页

作者：陈庆虎方奕栋劳伟超黄钰期许霖杰上海理工大学能源与动力工程学院上海200093 上海市动力工程多相流动与传热重点实验室上海200093 浙江大学能源工程学院浙江杭州310027

针对竖直多波纹板片内R134a的流动沸腾进行实验研究,采用高速相机捕捉并分析两相流型的衍变规律,分析干度对换热系数、压降的影响。结果表明:板片内部的汽液相于其所处平面沿水平方向存在交替分布特征;随着干度上升,板片左上角部分流域... 详细信息

针对竖直多波纹板片内R134a的流动沸腾进行实验研究,采用高速相机捕捉并分析两相流型的衍变规律,分析干度对换热系数、压降的影响。结果表明:板片内部的汽液相于其所处平面沿水平方向存在交替分布特征;随着干度上升,板片左上角部分流域出现相对停滞的液膜区,其面积随着干度的增加而扩大;波纹板片内的主导换热机制由核态沸腾逐渐转变为对流沸腾。当干度x较低时(x0.7),板片内出现局部干涸现象,换热系数迅速下降。当质量通量相同时,板片的摩擦压降随干度的增加而增加,而饱和压力的上升会使得摩擦压降有所降低,最大降幅为20.4%。

关键词：板式换热器流动沸腾流型换热特性

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Investigation on the Influence of Refrigerant Charge Amount on the Cooling Performance of Air Conditioning Heat Pump System for Electric Vehicles

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Journal of Thermal Science 2019年第2期28卷 294-305页

作者： LI Kang LAN Jiao ZHOU Guoliang TANG Qitian CHENG Qia fang yidong SU Lin School of Energy and Power Engineering University of Shanghai for Science and Technology

The application of air conditioning heat pump(ACHP) in electric vehicles could lead to significant electrical power saving effect. As for an air conditioning heat pump system for electric vehicles, the influence of refrigerant charge amount should be investigated during the design phase. In this study, experimental method was employed to investigate the influence of the refrigerant charge amount on the performance of the ACHP system. The results showed that the refrigerant charge amount had different influence on the refrigerant properties at various locations within the system. The coefficient of performance and pressure-enthalpy diagram were calculated, and showed a close relationship with refrigerant charge amount under different compressor speeds. The degree of subcooling and the degree of superheating were recorded and the critical charge amount was determined by a typical practical test method. In addition, the critical refrigerant charge amount determined by the experimental method was also compared with two typical void fraction correlation models, and the model with consideration of two phase stream reaction of the refrigerant showed a good estimation accuracy on the critical charge amount.

关键词： air conditioning heat pump electric vehicle critical refrigerant charge cooling performance

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Study on pneumatic-fuel hybrid system based on waste heat recovery from cooling water of internal combustion engine

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Science China(Technological Sciences) 2013年第12期56卷 3070-3080页

作者： fang yidong LI DaoFei FAN ZhiPeng XU HuanXiang WANG Lei YU XiaoLi Department of Energy Engineering Zhejiang University

The paper proposes a novel pneumatic-fuel hybrid system,which combines a traditional internal combustion engine(ICE)and a pneumatic *** important merit of this concept is that the system can recover waste from cooling water of internal combustion engine to optimize the working process of pneumatic engine,and thus to improve the entire efficiency of the hybrid ***,energy-saving effect due to lower cooling fan power can be achieved on ICE by waste heat recovery of pneumatic *** on thermodynamic analysis,an experimental system is designed and established for *** experimental results show that the performance of pneumatic engine is improved when the waste heat recovery concept of the hybrid system is *** an application example on a 4-cylinder engine is analyzed and discussed using numerical *** results show that the fan power of the ICE cooling system can be saved up to 50%by applying the hybrid *** the appreciable improvements on the energy efficiency with only limited system modifications when the concept is applied to traditional ICE based power systems,the proposed hybrid concept has the potential to serve as an alternative technology aiming for energy saving and emission reduction.

关键词： pneumatic engine pneumatic-fuel hybrid system waste heat recovery experimental study efficiency improvement

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S-scheme heterojunction of crystalline carbon nitride nanosheets and ultrafine WO_(3)nanoparticles for photocatalytic CO_(2)reduction

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Journal of Environmental Sciences 2024年第6期140卷 103-112页

作者： Gongjie Chen Ziruo Zhou Bifang Li Xiahui Lin Can Yang Yuanxing fang Wei Lin yidong Hou Guigang Zhang Sibo Wang State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFujian 350116China

Highly crystalline carbon nitride polymers have shown great opportunities in overall water photosplitting;however,their mission in light-driven CO_(2)conversion remains to be *** this work,crystalline carbon nitride(CCN)nanosheets of poly triazine imide(PTI)embedded with melon domains are fabricated by KCl/LiCl-mediated polycondensation of dicyandiamide,the surface of which is subsequently deposited with ultrafine WO_(3)nanoparticles to construct the CCN/WO_(3)heterostructure with a S-scheme *** characterizations have been conducted to reveal the compositions and structures of the S-scheme CCN/WO_(3)hybrid,featuring strengthened optical capture,enhanced CO_(2)adsorption and activation,attractive textural properties,as well as spatial separation and directed movement of light-triggered charge *** mild conditions,the CCN/WO_(3)catalyst with optimized composition displays a high photocatalytic activity for reducing CO_(2)to CO in a rate of 23.0μmol/hr(i.e.,2300μmol/(hr·g)),which is about 7-fold that of pristine CCN,along with a high CO selectivity of 90.6%against ***,it also manifests high stability and fine reusability for the CO_(2)conversion *** CO_(2)adsorption and conversion processes on the catalyst are monitored by in-situ diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS),identifying the crucial intermediates of CO_(2)^(*)-,COOH^(*)and CO^(*),which integrated with the results of performance evaluation proposes the possible CO_(2)reduction mechanism.

关键词： Crystalline carbon nitride Photocatalysis CO_(2)reduction S-scheme WO_(3)

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Defect and nanostructure engineering of polymeric carbon nitride for visible-light-driven CO2 reduction

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结构化学 2024年第3期43卷 10-18页

作者： Ziruo Zhou Wenyu Guo Tingyu Yang Dandan Zheng Yuanxing fang Xiahui Lin yidong Hou Guigang Zhang Sibo Wang State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhou350116China College of Environment and Safety Engineering Fuzhou UniversityFuzhou350108China

Sunlight-induced photocatalytic carbon dioxide(CO2)reduction to energy-rich chemicals by metal-free polymeric carbon nitride(CN)semiconductor is a promising tactic for sustained solar fuel ***,the reaction efficiency of CO2 photoreduction is restrained seriously by the rapid recombination of photogenerated carriers on CN ***,we incorporate 2-aminopyridine molecule with strong electron-withdrawing group into the skeleton edge of CN layers through a facile one-pot thermal polymerization strategy using urea as the precursor,which renders a modified carbon nitride(ACN)with extended optical harvesting,abundant nitrogen defects and ultrathin nanosheet ***,the ACN photocatalyst with desirable structural features attains enhanced separation and migration of photoexcited charge *** visible light irradiation with Co(bpy)32+as a cocatalyst,the optimized ACN sample manifests a high CO2 deoxygnative reduction activity and high sta-bility,providing a CO yielding rate of 17 μmol h-1,which is significantly higher than that of pristine *** key intermediates engaged in CO2 photoreduction reaction are determined by the in situ diffuse reflectance infrared Fourier transform spectroscopy,which sponsors the construction of the possible photocatalytic CO2 reduction mechanism on ACN nanosheets.

关键词： Carbon nitride Photocatalysis CO_2 reduction Nitrogen defects Nanosheets

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FRACTAL CHARACTERIZATION OF ELECTROMAGNETIC SCATTFRING WAVES FROM ROUGH SEA SURFACES

FRACTAL CHARACTERIZATION OF ELECTROMAGNETIC SCATTFRING WAVES...

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1998 International Conference on Microwave and Millimeter Wave Technology

作者： Jihuan YAO yidong fang Jingming XIAO Debiao GE Physics department Xidian University

＜正＞Based on the sea power spectrum a fractal model of equilibrium gravity waves is *** analytical closed-form formulation of scattering coefficient is also *** the fractal dimension of hack scattered wave is extracted by box-counting technique,and its relation with the parameters of sea surface and radar system *** results obtained is useful for target detection on the rough sea surface and remote sensing.

关键词： rough sea surface gravity wave fractal dimension kirchhoff approximation

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Salt-melt synthesis of poly(heptazine imide)in binary alkali metal bromides for enhanced visible-light photocatalytic hydrogen production

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Interdisciplinary Materials 2024年第3期3卷 389-399页

作者： Yaxuan Jin Dandan Zheng Zhongpu fang Zhiming Pan Sibo Wang yidong Hou Oleksandr Savateev Yongfan Zhang Guigang Zhang State Key Laboratory of Photocatalysis on Energy and Environment College of Chemistry Fuzhou UniversityFuzhouChina College of Environment and Safety Engineering Fuzhou UniversityFuzhouChina Department of Chemistry The Chinese University of Hong KongShatinNew TerritoriesHong KongChina

Poly(heptazine imide)(PHI),a semicrystalline version of carbon nitride photocatalyst based on heptazine units,has gained significant attention for solar H_(2)production benefiting from its advantages including molecular synthetic versatility,excellent physicochemical stability and suitable energy band structure to capture visible ***,PHI is obtained in saltmelt synthesis in the presence of alkali metal ***,we examined the role of binary alkali metal bromides(LiBr/NaBr)with diverse compositions and melting points to rationally modulate the polymerization process,structure,and properties of *** characterizations revealed that semicrystalline PHI with a condensedπ-conjugated system and rapid charge separation rates were obtained in the presence of LiBr/***,the apparent quantum yield of hydrogen using the optimized PHI reaches up to 62.3%at 420 *** density functional theory calculation shows that the dehydrogenation of the ethylene glycol has a lower energy barrier than the dehydrogenation of the other alcohols from the thermodynamic point of *** study holds great promise for rational modulation of the structure and properties of conjugated polymeric materials.

关键词： crystallinity hydrogen evolution photocatalysis poly(heptazine imide) salt-melt synthesis

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DOC+DPF对生物柴油发动机排气颗粒理化特性的影响

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内燃机学报 2016年第2期34卷 142-146页

作者：方奕栋楼狄明胡志远谭丕强同济大学机械工程博士后流动站上海201804 同济大学汽车学院上海201804

以某型高压共轨柴油机为研究对象,研究试验样机燃用BD20混合燃料时,DOC+DPF后处理装置对其排气颗粒理化特性的影响.结果表明:外特性工况下,试验样机连接DOC+DPF后,聚集态颗粒数量浓度降幅最高达99.4%,,而核态颗粒数量浓度降幅不如聚集... 详细信息

以某型高压共轨柴油机为研究对象,研究试验样机燃用BD20混合燃料时,DOC+DPF后处理装置对其排气颗粒理化特性的影响.结果表明:外特性工况下,试验样机连接DOC+DPF后,聚集态颗粒数量浓度降幅最高达99.4%,,而核态颗粒数量浓度降幅不如聚集态颗粒.随试验样机转速上升,DOC+DPF的捕集效率呈上升趋势.此外,试验样机连接DOC+DPF后,多环芳烃(polycyclic aromatic hydrocarbons,PAH)排放质量下降91.5%,,所检测的19种PAH组分中,有17种组分排放质量减少,DOC+DPF可使PAH等效毒性下降93.9%,.

关键词：颗粒捕集生物柴油颗粒排放理化特性

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