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Experimental study on the enhancement of free convection heat transfer under the action of an electric field

EXPERIMENTAL THERMAL AND FLUID SCIENCE 2019年 104卷 9-14页

作者： Gao, Ming Zhang, Ling-shuang Zhang, Da Zhang, Li-xin Univ Shanghai Sci & Technol Shanghai Key Lab Multiphase Flow & Heat Transfer Sch Energy & Power Engn Shanghai 200093 Peoples R China

In this paper, the electrohydrodynamic (EHD) enhancement of free convection heat transfer is studied experimentally. A smooth copper heating surface is submerged in R113 liquid, the heat fluxes ranging from 4461 W/m(2) to 17805 W/m(2), and a high voltage ranging from 1 kV to 5 kV are applied on the heating surface. High speed photography is used to record the images of electroconvection. The results show the relationship between the intensity of the electric field, the height of the electroconvection layer and the enhancement of the heat transfer coefficient. Electric field can enhance free convection heat transfer, with the increase of the electric field the fluid disturbance on the heating surface increases obviously, and with the increase of the heat fluxes the enhancement of electric field gradually decreases.

关键词： Electrohydrodynamic enhancement Free convection Electroconvection heat transfer

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A laser interference/high-speed photography method for the study of triple phase contact-line movements and lateral rewetting flow during single bubble growth on a small hydrophilic heated surface

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INTERNATIONAL COMMUNICATIONS IN heat AND MASS transfer 2019年 100卷 111-117页

作者： Liu, Jing-nan Gao, Ming Zhang, Ling-shuang Zhang, Li-xin Univ Shanghai Sci & Technol Shanghai Key Lab Multiphase Flow & Heat Transfer Sch Energy & Power Engn Shanghai 200093 Peoples R China

The laser interferometric method and high-speed camera techniques are used simultaneously to study dynamic characteristics of a single vapor bubble growth and departure from an ITO heater surface submerged in ethanol. Two high-speed cameras are used simultaneously in this experiment: one is used to record interference fringes of the microlayer at the bubble's bottom and the other is used to record the growth and detachment of the single bubble synchronously from the side view. By comparing these images frame by frame, it is found that the bubble's growth time can be divided into two periods sequentially: the microlayer period and the lateral rewetting period. Variations of dry spot radius, bubble contact radius, bubble volume and diameter, dynamic contact angles during these two periods are illustrated.

关键词： Bubble growth Microlayer Rewetting Interferometric method

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Thermochemical characteristics and non-isothermal kinetics of camphor biomass waste

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JOURNAL OF ENVIRONMENTAL CHEMICAL engineering 2021年第4期9卷

作者： Li, Jingjing Dou, Binlin Zhang, Hua Zhang, Hao Chen, Haisheng Xu, Yujie Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China Chinese Acad Sci Inst Engn Thermophys Beijing 100190 Peoples R China

To enhance the understanding of conversion processes and decomposition characteristics, the mass losses, intermediates evolved and products formed during pyrolysis of camphor biomass waste were determined by coupling DSC/TGA-DTG/GC-MS/FTIR. The non-isothermal kinetics of pyrolysis and combustion processes under the heating rates of 10, 15 and 20 degrees C/min were studied by the improved Coats-Redfern method. The activation energies and the pre-exponential factors were estimated iteratively by regression to improve their accuracy. The results indicated the mass losses could be divided into the different phases and the exothermic and/or endothermic reactions occurred. The functional groups and condensable/non-condensable gases such as O.H, C-O, C-O, C-O-C, C.H benzene skeleton, CO, H-2, CO2, CH4, etc. were detected at different temperatures. The nonisothermal kinetic models based on improved iterative Coats-Redfern method fitted the experiments adequately in each phase both pyrolysis and combustion of camphor biomass waste. The nucleation and one-dimensional diffusion were found the suitable models, and the values of activation energy on main mass loss in the second phase of pyrolysis and combustion were obtained 39.98-56.25 and 109.26-135.84 kJ/mol, respectively.

关键词： Camphor biomass waste Non-isothermal kinetics DSC/TG-DTG TG/GC-MS/FTIR

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Experimental study on potassium catalyzed gasification of large particle size biomass with CO2

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Journal of the Energy Institute 2023年 111卷

作者： Huang, Xiaole Li, Yuhang Ren, Jiyun Yang, KaiXuan Li, Ruiyu Bai, Yang Deng, Lei Che, Defu State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi'an Jiaotong University Xi'an710049 China Xi'an Thermal Power Research Institue Co. Ltd. Xi'an710032 China Shanghai Power Equipment Research Institute Co. Ltd. Shanghai 200240 China Shunde Institue of Inspection Guangdong Institue of Special Equipment Inspection and Research Foshan528300 China

Candlenut wood with large particle size is selected to investigate the biomass gasification catalyzed by potassium. The sample pore structure, the spatial distribution of potassium, and the effects of potassium salt species on the biomass gasification with CO2 are examined. The results show that the large particle candlenut wood exhibits obvious spatial anisotropy and that the pore structure is mainly distributed along the axial direction. Large particle candlenut wood has a more uniform distribution of potassium salts along the axial direction. Part of the potassium salt releases outward during the gasification, which reduces the potassium salt content in the sample center. The average potassium contents of sample loaded with KCl and biochar of sample loaded with KCl are 9.273% and 7.745%, respectively. The synthesis of polycyclic aromatic hydrocarbons in tar could be inhibited by potassium, which could also catalyze the gasification and methane removal reactions of biochar and facilitate the formation of CO and H2. Compared to raw sample (28.99%), the syngas yields from the gasification of sample loaded with KCl, sample loaded with K2CO3, and sample loaded with K2SO4 are 40.22%, 52.16%, and 41.72%, separately. The catalysis of potassium is closely related to its occupation of the active sites on biochar. The chemical bonds formed by potassium and biochar are repeatedly broken and formed during the gasification, which promotes the decomposition of organic matter. Compared with KCl and K2SO4, K2CO3 has a better catalytic effect. © 2023 Energy Institute

关键词： Biomass

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Theoretical and experimental advances on heat transfer and flow characteristics of metal foams

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Science China(Technological Sciences) 2020年第5期63卷 705-718页

作者： WANG Hui GUO LieJin CHEN Kang School of Environmental Science and Engineering Donghua UniversityShanghai 201620China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an 710049China Institute of Solar Engineering Technology Northwest Engineering Corporation LimitedPowerChinaXi’an 710065China

Open cell metal foam can be applied to greatly improve thermal performance of heat sink and heat exchanger,so that it has been widely used in the fields of thermal(or heat)control system of aerospace vehicle and energy utilization system and become a very important topic for research in the aerospace thermophysics field,and more and more attentions have been *** optimal design of metal foam heat transfer devices is based on the understanding the flow and heat transfer characteristics in metal *** article reviews some recent progresses of theoretical and experimental researches on heat transfer enhancement and flow characteristics of metal *** found that the pore cell simplification models of metal foams generally fall into four categories,among which the most commonly used cell model is Kelivin *** exploratory works performed by the current authors are also introduced,such as the effect of boundary conditions on the heat transfer enhancement;the theoretical modelling of interfacial convective heat transfer taking into account heat conduction between foam ligaments;and the flow characteristics under relatively high *** analytical results show that the flow characteristics of metal foam at relatively high speed are completely different from those at low speed,a further thorough study of the heat transfer and flow characteristics of metal foam is necessarily *** this paper,two types of partial filling techniques are *** heat transfer performance of partially filled tubes was evaluated by both the performance evaluation criteria and the performance evaluation plot of enhanced heat transfer techniques oriented for *** results show that the filling type of metal foam have a significant impact on its heat transfer enhancement ***,the filling method of metal foam should be further studied,in order to optimize the thermophysical properties of heat transfer devices.

关键词： metal foam effective thermal conductivity interfacial convective heat transfer coefficient heat transfer enhancement thermal radiation

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Study on heat and Mass transfer Distance of Water-Film Evaporation in Limited Space Using Dual-Wavelength Digital Holographic Interference

SSRN

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SSRN 2022年

作者： Liu, Jing-Nan Zhang, Meng-Meng Zhang, Lin-Xin Di, Jiang-Lei Zhao, Jian-Lin Gao, Ming Sun, Yue-Dong Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering University of Shanghai for Science and Technology Shanghai200093 China MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions Shaanxi Key Laboratory of Optical Information Technology School of Physical Science and Technology Northwestern Polytechnical University Shaanxi Xi’an710129 China Advanced Institute of Photonics Technology School of Information Engineering Guangdong Provincial Key Laboratory of Information Photonics Technology Guangdong University of Technology Guangzhou51006 China

To study the heat and mass transfer between evaporating water film and air in limited space, the temperature and humidity distributions of air near the flowing water film was measured using dual-wavelength digital holographic interference (DHI). The holograms were recorded by CMOS with two different wavelengths of 532 nm and 671 nm. We derived the relationships between the phase changes reconstructed from the holograms and the air temperature and humidity changes based on the Edlen formulas. A experimental model was built to generate steady water film and demonstrate the heat and mass transfer in air countercurrent to the water film, which flows down on the copper plate. The model has two symmetrical tunnels isolated by a copper plate in the middle, allowing to compare the cases of heat mass transfer with and without evaporation. The relative measurement errors of temperature and humidity are less than x% and y%, respectively, by comparing the reconstructed results with the sensor measured values. Based on the measurement results, the concept, feature transfer distance (FTD), is proposed, which characterizes the intensity of heat and mass transfer. By analyzing FTD, the main influencing factors of heat and mass transfer were obtained. © 2022, The Authors. All rights reserved.

关键词： Evaporation

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Co-production of hydrogen and syngas from chemical looping water splitting coupled with decomposition of glycerol using Fe-Ce-Ni based oxygen carriers

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ENERGY CONVERSION AND MANAGEMENT 2021年 238卷 114166-114166页

作者： Luo, Chuanqi Dou, Binlin Zhang, Hua Liu, Dashuai Zhao, Longfei Chen, Haisheng Xu, Yujie Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China Chinese Acad Sci Inst Engn Thermophys Beijing 100190 Peoples R China

In this study, chemical looping water splitting (CLWS) coupled with glycerol decomposition to simultaneously produce hydrogen and syngas was proposed using the iron-cerium-nickel (Fe-Ce-Ni) based oxygen carriers (OCs). The OCs containing large amounts of iron were synthesized by the metal chelating sol-gel method and characterized by BET, XRD and TEM. During the fuel stage, the OCs of oxidation state were first reduced by the glycerol and reactive gases from catalytic decomposition of glycerol producing syngas. Afterward in the subsequent steam stage, the previously reduced OCs were re-oxidized by the steam to generate pure hydrogen, which was also named the steam iron process (SIP). The prepared Fe-Ce-Ni based OCs demonstrated the remarkable redox behavior, and exerted an important catalytic function of the partial oxidation and decomposition of glycerol at 750 degrees C. The OCs with 100:10:3 of Fe-Ce-Ni molar ratio presented the best capability of oxygen transfer and the highest yields of hydrogen and syngas, reaching the water splitting hydrogen production of 11.79 mmol/g per cycle on average and guaranteeing the high conversion of glycerol and selectivity of syngas. This could be ascribed to the preferable dispersion of Ce and Ni nanoparticle on the OCs. The results also proved the effectiveness of Ce and Ni doping Fe based OCs by the improved metal chelating sol-gel method to develop the catalysts with high activity and stability for co-production of hydrogen and syngas from CLWS coupled with glycerol decomposition.

关键词： Chemical looping water splitting (CLWS) Catalytic decomposition of glycerol Iron-cerium-nickel based oxygen carriers (Fe-Ce-Ni OCs) Co-production of hydrogen production and syngas

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Enhanced natural gas hydrates formation in the suspension with metal particles and fibers

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JOURNAL OF MOLECULAR LIQUIDS 2020年 301卷 112410-112410页

作者： Yang, Liang Liu, Zhenzhen Liu, Daoping Cui, Guomin Dou, Binlin Wang, Juan Hao, Shuqing Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China Shanghai Univ Elect Power Sch Environm & Chem Engn Shanghai 200090 Peoples R China China Univ Min & Technol Sch Resources & Geosci Key Lab Coalbed Methane Resources & Reservoir For Minist Educ China Xuzhou 221116 Jiangsu Peoples R China

The relatively slow gas storage rate as well as poor storage capacity of the static hydration system are still major challenges in the large-scale practical application of hydrate technology. Sodium dodecyl sulfate (SDS) solutions containing suspended copper particles (CP) and stainless steel fibers (SSF) were used for natural gas storage in clathrate hydrates at 4.0-7.0 MPa and 274.15 K. The particles and fibers in the suspension provided a large number of metal nuclei for crystallization, especially the fibers acted as metal pathway for crystallization heat transfer. The enhanced effect of CP and SSF on gas capture in hydrates was concluded through kinetics comparison of hydrates formation in the suspension and in a simple surfactant solution. In the SDS/CP-SSF system, the time required to reach the storage capacity of 100 cm(3). cm(-3) was shorter not only than that in the SDS solution but also than that in the CP suspension at each pressure. The hybrid suspension exhibited higher gas storage capacities (112.6-149.2 m(3). m(-3)) and larger storage rates (7.54-39.47 cm(3). cm(-3). min(-1)) at the applied pressures, increasing by 35.6-173.0% and 19.8-26.2%, respectively, over those of the simple surfactant solution. A "point (CP)-line (SSF) model" was proposed to illustrate the synergetic enhancement effect of the CP and SSF on hydrate nucleation and heat transfer. (C) 2019 Elsevier B.V. All rights reserved.

关键词： Natural gas Hydrates Formation Gas storage Metal fibers

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A review on thermal application of metal foam

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Science China(Technological Sciences) 2020年第12期63卷 2469-2490页

作者： CHEN Kang GUO LieJin WANG Hui State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an 710049China Institute of Solar Engineering Technology Northwest Engineering Corporation LimitedPowerChinaXi’an 710065China School of Environmental Science and Engineering Donghua UniversityShanghai 201620China

heat exchangers embedded with metal foam are drawing increasing attention in the thermal application field,due to the performance of low density,large ratio of surface area to volume as well as high thermal conductivity. In these applications,compact heat exchanger,solar thermal facilities and thermal energy storage are the three core components. This paper focuses on the lasted advances in thermal applications,presenting a review of theoretical and experimental progress over metal foam in thermal application. The empirical and theoretical models for pressure drop,heat transfer coefficient and performance evaluation criteria of compact heat exchangers with metal foam are reviewed and discussed,especially different optimized *** is a trade-off between heat transfer enhancement and increase of pressure drop. Some exploratory work performed by present authors are also introduced. The manufacturing,heat transfer and flow characteristics of tube bundle wrapped with metal foam are taken into account for optimization of heat exchanger. It is confirmed that the conversion mechanism of heat transfer is carried out that heat conduction is the dominative term at high dimension permeability. The correlations of heat transfer rate and pressure drop for staggered and single row tube bundle wrapped with metal foam are concluded,respectively. The effects of different bonding methods are revealed for point-contact in metal foam and base tube. The powder-sintering method can provide a stable and minimum-thickness bonding layer. Various types of solar thermal facilities utilized metal foam to improve the energy conversion efficiency from solar radiant energy to thermal energy are also reviewed and discussed,including solar collector for intermediate-low temperature utilization and solar receiver for high temperature utilization. The Last but not least,existing and future metal foam thermal application stations are overviewed.

关键词： metal foam heat transfer enhancement solar thermal facilities thermal energy storage

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A fully-coupled analysis of the spar-type floating offshore wind turbine with bionic fractal heave plate under wind-wave excitation conditions

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RENEWABLE ENERGY 2024年 232卷

作者： Huang, Haoda Liu, Qingsong Iglesias, Gregorio Yue, Minnan Miao, Weipao Ye, Qi Li, Chun Yang, Tingting Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai 200093 Peoples R China Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China Univ Coll Cork Sch Engn & Architecture Coll Rd Cork T12 K8AF Ireland Univ Plymouth Sch Engn Comp & Math Plymouth PL4 8AA England Liverpool John Moores Univ Liverpool Logist Offshore & Marine LOOM Res Inst Byrom St Liverpool L3 3AF England

As shallow coastal areas for the installation of wind turbines approach saturation, wind turbines will need to be installed in deeper areas, requiring floating rather than seabed-fixed substructures. Considering factors such as economy and safety, floating offshore wind turbines (FOWTs) have become the major focus for offshore wind research and development. In the case of spar-type FOWTs, stability in the heave direction poses a challenge. With this in view, in this work a heave plate with bionic fractal structures is mounted on the bottom of the spar- type FOWT. The bionic fractal heave plates are innovatively proposed to further improve the dynamic response of the FOWT. In this study, the aero-hydro-mooring dynamic method of the FOWT is established to develop a reliable numerical solution model through the DFBI module using computational fluid dynamics software STARCCM+. The results of fully-coupled simulations of the original FOWT, the FOWT with heave plate (HP-FOWT) and FOWTs with 3 5-layer bionic fractal heave plate (3 5BFHP-FOWTs) are presented. Increases in average thrust and power of 0.44 % and 0.99 %, respectively, prove the optimal aerodynamic responses of the 5 BFHPFOWT. As for the hydrodynamic responses, the average heave response amplitudes of the HP-FOWT and 3 5BFHP-FOWTs are significantly lower than the original FOWT. The maximum reduction (25.03 %) is obtained by the 5BFHP-FOWT. The bionic fractal heave plate will slightly reduce the stability of the pitch response. For the standard deviation of the heave, surge, mooring lines 1 and 2 responses, the 5BFHP-FOWT decreases by 17.97%, 11.44 %, 17.50 %, and 8.25 % respectively, showing the best stability improvement among the HP-FOWT and BFHP-FOWTs. Furthermore, the vortices in the bionic fractal heave plates are analyzed in detail at the Z = +/- 0.25 m section of the flow field. Only when the specific fractal layer number is 5, the number and curl of the vortices in the fractal structure increase signifi

关键词： Fully-coupled aero-hydro-mooring dynamics Floating offshore wind turbine Heave plate Bionic fractal structure Computational fluid dynamics

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