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< Page ,Total 7 >
Experimental study of direct solar photocatalytic water splitting for hydrogen production under natural circulation conditions EI CPCI-S SCIE Scopus
会议论文 | 2018 , 43 (30) , 13727-13737 | 8th International Conference on Hydrogen Production (ICH2P)
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Abstract :

Photocatalytic water splitting for hydrogen production provides a promising route for the future hydrogen economy, being operational in the visible light domain with a potential use of solar radiation. An outdoor pilot demonstration of CPC-based photoreactors has been designed, installed and tested at the State Key Laboratory of Multiphase Flow in Power Engineering to assess its effectiveness in solar photocatalytic hydrogen production. Nine sets of CPC-based photoreactors, each of which is 3.6 m(2) in area and 23 L in volume, are connected, controlled and operated in parallel. The high efficiency photocatalyst (Cd1-xZnxS), low concentration sacrifice agents (Na2S and Na2SO3) and deionized water are the raw materials of the pilot system. Two operation models, viz. the natural circulation model and the gas disturbance model, are proposed considering the expense and the efficiency. From our observations, the slurry temperature inside the tubes rises by 20-30 degrees C from the ambient. The slurry velocity can reach 1.2 m/s in the gas disturbance model, but is as low as 3.5 cm/s in the natural circulation model. The average hydrogen productivity is 184.30 mL/min and accumulated to be 10.321 L/h in the natural circulation model, with the average solar radiation, photocatalyst concentration and sacrifice agents' concentration being 803.8 W/m(2), 2.77 g/L and 0.1 mol/L, respectively. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Keyword :

Solar energy Photoreactor System design Photocatalytic hydrogen production

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GB/T 7714 Cao, Fei , Liu, Huan , Wei, Qingyu et al. Experimental study of direct solar photocatalytic water splitting for hydrogen production under natural circulation conditions [C] . 2018 : 13727-13737 .
MLA Cao, Fei et al. "Experimental study of direct solar photocatalytic water splitting for hydrogen production under natural circulation conditions" . (2018) : 13727-13737 .
APA Cao, Fei , Liu, Huan , Wei, Qingyu , Zhao, Liang , Guo, Liejin . Experimental study of direct solar photocatalytic water splitting for hydrogen production under natural circulation conditions . (2018) : 13727-13737 .
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Flow Boiling Heat Transfer of R134a in a Vertical Helically Coiled Tube EI Scopus
期刊论文 | 2018 , 1-10 | Heat Transfer Engineering
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Abstract :

The boiling heat transfer characteristics of R134a in a helically coiled tube under high heat flux condition were investigated experimentally in present paper. The inner diameter and the coil diameter of the coil were 8 mm and 205 mm, respectively. Experiments were carried out with the heat flux in the range of 10–60 kW/m2, pressure 0.8–1.1 MPa, mass flux 195–400 kg/(m2s) and vapor qualities 0.1–0.9. The results show that nucleate boiling plays a significant role even at high vapor quality. Inversely, the convective boiling was weakened in the high quality region under high heat flux conditions. The available boiling heat transfer coefficient correlations were compared with present experimental results. A new boiling heat transfer coefficient correlation for R134a in helically coiled tube was proposed based on the boiling mechanisms analysis. The new correlation was also proved to be applicable for high mass flux and low heat flux conditions. © 2018 Taylor & Francis Group, LLC

Keyword :

Boiling heat transfer Boiling heat-transfer coefficients Convective boiling Flow boiling heat transfer Flux conditions Helically coiled tubes Inner diameters New correlations

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GB/T 7714 Niu, Xiaojuan , Yuan, Huaijie , Quan, Chen et al. Flow Boiling Heat Transfer of R134a in a Vertical Helically Coiled Tube [J]. | Heat Transfer Engineering , 2018 : 1-10 .
MLA Niu, Xiaojuan et al. "Flow Boiling Heat Transfer of R134a in a Vertical Helically Coiled Tube" . | Heat Transfer Engineering (2018) : 1-10 .
APA Niu, Xiaojuan , Yuan, Huaijie , Quan, Chen , Bai, Bofeng , Zhao, Liang . Flow Boiling Heat Transfer of R134a in a Vertical Helically Coiled Tube . | Heat Transfer Engineering , 2018 , 1-10 .
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Optimization of the radiation absorption for a scaled-up photocatalytic hydrogen production system EI SCIE Scopus
期刊论文 | 2018 , 160 , 168-177 | SOLAR ENERGY
WoS CC Cited Count: 4 SCOPUS Cited Count: 4
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Abstract :

The effective absorption of photons by photocatalyst in the reactor is a challenge for scaled-up application of a photocatalytic hydrogen production system. The spatial distribution of radiation and photon absorption are proposed to be strongly dependent on the photocatalyst concentration and the structure of the solar collector. However, there have been few reports of the radiation absorption properties of a cylindrical reactor based on high power solar collector that is suitable for a large-scale photocatalytic hydrogen production system. In this study, the distribution of radiation in the reactor as represented by the local volumetric rate of photon absorption was determined by adopting the modified six-flux absorption scattering model based on the compound parabolic concentrator and the surface uniform concentrator. The explanations of the differences of radiation absorption properties were comprehensively analyzed by ray-tracking technique. The structure of the solar collector and the optimum catalyst concentration are recommended based on photon absorption efficiency. This work may serve as potential reference values for the optimal reactor operating parameters for large-scale application.

Keyword :

Photon absorption efficiency Optimum catalyst concentration Photocatalytic hydrogen production system Solar collector

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GB/T 7714 Yang, Yan , Wei, Qingyu , Liu, Haijun et al. Optimization of the radiation absorption for a scaled-up photocatalytic hydrogen production system [J]. | SOLAR ENERGY , 2018 , 160 : 168-177 .
MLA Yang, Yan et al. "Optimization of the radiation absorption for a scaled-up photocatalytic hydrogen production system" . | SOLAR ENERGY 160 (2018) : 168-177 .
APA Yang, Yan , Wei, Qingyu , Liu, Haijun , Zhao, Liang . Optimization of the radiation absorption for a scaled-up photocatalytic hydrogen production system . | SOLAR ENERGY , 2018 , 160 , 168-177 .
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Single particle train ordering in microchannel based on inertial and vortex effects EI SCIE Scopus
期刊论文 | 2018 , 28 (6) | JOURNAL OF MICROMECHANICS AND MICROENGINEERING
WoS CC Cited Count: 2 SCOPUS Cited Count: 2
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Abstract :

A new microfluidic device for microparticle focusing and ordering in a single particle train is reported. The particle focusing and ordering are based on inertial and vortex effects in a microchannel with a series of suddenly contracted and widely expanded structures on one side. In the suddenly contracted regions, particles located near the contracted structures are subjected to a strong wall-effect lift force and momentum-change-induced inertial force due to the highly curved trajectory, migrating to the straight wall. A horizontal vortex is generated downstream of the contracted structure, which prevents the particle from getting close to the wall. In the widely expanded regions, the streamline is curved and no vortex is generated. The shear-gradient lift force and the momentum-change-induced inertial force are dominant for particle lateral migration, driving particles towards the wall of the expanded structures. Eventually, particles are focused and ordered in a single particle train by the combination effects of the inertial forces and the vortex. In comparison with other single-stream particle focusing methods, this device requires no sheath flow, is easy for fabrication and operation, and can work over a wide range of Reynolds numbers from 19.1-142.9. The highly ordered particle chain could be potentially utilized in a variety of lab-chip applications, including micro-flow cytometer, imaging and droplet-based cell entrapment.

Keyword :

vortex particle train particle focusing inertial effect microchannel

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GB/T 7714 Fan, Liang-Liang , Yan, Qing , Zhe, Jiang et al. Single particle train ordering in microchannel based on inertial and vortex effects [J]. | JOURNAL OF MICROMECHANICS AND MICROENGINEERING , 2018 , 28 (6) .
MLA Fan, Liang-Liang et al. "Single particle train ordering in microchannel based on inertial and vortex effects" . | JOURNAL OF MICROMECHANICS AND MICROENGINEERING 28 . 6 (2018) .
APA Fan, Liang-Liang , Yan, Qing , Zhe, Jiang , Zhao, Liang . Single particle train ordering in microchannel based on inertial and vortex effects . | JOURNAL OF MICROMECHANICS AND MICROENGINEERING , 2018 , 28 (6) .
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Development of the direct solar photocatalytic water splitting system for hydrogen production in Northwest China: Design and evaluation of photoreactor EI SCIE Scopus
期刊论文 | 2018 , 121 , 153-163 | RENEWABLE ENERGY
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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Abstract :

A novel CPC reactor for solar photocatalytic hydrogen production was designed and evaluated in the present study. Two operation models, namely the natural circulation model and the gas disturbance model, are proposed and illustrated from the viewpoints of thermodynamics and hydrodynamics. The designed photoreactor is operated under natural circulation for most of the time, with high pressure gas disturbing the sedimentary photocatalysts from time to time. The CPC parameters are designed according to the local meteorological conditions. The reactor performance such as the radiation distribution on the absorber tube, the absorbed solar irradiation, the critical flow rates and the hydrogen productivity are estimated and analyzed. An east-west orientated, north-south angle adjustable and truncated CPC with the concentration ratio of 4.12 is designed for the photoreactor. The required limiting settling velocity is much larger than the natural circulation velocity, which validates the necessity of gas disturbance. The estimated results show that the ideal mean hydrogen productivities are 2.9 L/h and 4.0 L/h in a typical spring and summer week respectively, with the photocatalyst being Cd0.5Zn0.5S. (C) 2018 Elsevier Ltd. All rights reserved.

Keyword :

CPC reactor Solar photocatalysis Solar photocatalytic hydrogen production Hydrogen production Solar energy

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GB/T 7714 Cao, Fei , Wei, Qingyu , Liu, Huan et al. Development of the direct solar photocatalytic water splitting system for hydrogen production in Northwest China: Design and evaluation of photoreactor [J]. | RENEWABLE ENERGY , 2018 , 121 : 153-163 .
MLA Cao, Fei et al. "Development of the direct solar photocatalytic water splitting system for hydrogen production in Northwest China: Design and evaluation of photoreactor" . | RENEWABLE ENERGY 121 (2018) : 153-163 .
APA Cao, Fei , Wei, Qingyu , Liu, Huan , Lu, Na , Zhao, Liang , Guo, Liejin . Development of the direct solar photocatalytic water splitting system for hydrogen production in Northwest China: Design and evaluation of photoreactor . | RENEWABLE ENERGY , 2018 , 121 , 153-163 .
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Dryout quality prediction for boiling two-phase flow in vertical helically coiled tubes EI SCIE Scopus
期刊论文 | 2018 , 128 , 982-992 | APPLIED THERMAL ENGINEERING
WoS CC Cited Count: 3 SCOPUS Cited Count: 4
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Abstract :

An analytical model for the prediction of the onset of dryout quality in annular flow regime in helically coiled tubes is present in this paper. According to the liquid film dryout mechanism, film dryout is primarily dependent on the competition between droplet entrainment and deposition with a certain heat flux. To this effect, it is necessary to define the net entrainment rate in the helical tube. The factors significantly affecting the droplet entrainment and deposition characteristics in the helical tube are analyzed theoretically. Three dimensionless numbers are used to modify the net entrainment rate in straight tube. A total of 252 experimental points from 6 different datasets are used to test the performance of the model. Comparisons between the calculated and experimental results in literatures indicate that the present model has good predictive capability in predicting onset of dryout in helically coiled tubes. (C) 2017 Elsevier Ltd. All rights reserved.

Keyword :

Helically coiled tube Net entrainment rate Deposition Entrainment Dryout

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GB/T 7714 Niu, Xiaojuan , Yuan, Huaijie , Quan, Chen et al. Dryout quality prediction for boiling two-phase flow in vertical helically coiled tubes [J]. | APPLIED THERMAL ENGINEERING , 2018 , 128 : 982-992 .
MLA Niu, Xiaojuan et al. "Dryout quality prediction for boiling two-phase flow in vertical helically coiled tubes" . | APPLIED THERMAL ENGINEERING 128 (2018) : 982-992 .
APA Niu, Xiaojuan , Yuan, Huaijie , Quan, Chen , Zhao, Liang . Dryout quality prediction for boiling two-phase flow in vertical helically coiled tubes . | APPLIED THERMAL ENGINEERING , 2018 , 128 , 982-992 .
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Experimental study on direct solar photocatalytic water splitting for hydrogen production using surface uniform concentrators EI CPCI-S SCIE Scopus
会议论文 | 2018 , 43 (30) , 13745-13753 | 8th International Conference on Hydrogen Production (ICH2P)
WoS CC Cited Count: 2 SCOPUS Cited Count: 2
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Abstract :

In this paper, a direct solar photocatalytic water splitting system with surface uniform concentrators (SUCs) is designed. Parameters influencing hydrogen production rates and energy conversion, viz. sacrificial agent concentration, catalyst concentration and circulation speed, are analyzed under typical days. It is found that the system with SUCs has better performances with higher sacrificial agent, higher catalyst concentration and lower speed: double and triple concentration of the sacrificial agent will improve the energy conversion efficiency by 4.52% and 19.35%, respectively; double and triple the photocatalyst concentration will improve the energy conversion efficiency by 81.32% and 200.00%, respectively; energy conversion efficiency under valve-half-closed and the valve-closed conditions are improve by 21.82% and 118.18% comparing with the valve-open condition. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Keyword :

Solar energy Photoreactor System design Photocatalytic hydrogen production

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GB/T 7714 Wei, Qingyu , Yang, Yan , Liu, Haijun et al. Experimental study on direct solar photocatalytic water splitting for hydrogen production using surface uniform concentrators [C] . 2018 : 13745-13753 .
MLA Wei, Qingyu et al. "Experimental study on direct solar photocatalytic water splitting for hydrogen production using surface uniform concentrators" . (2018) : 13745-13753 .
APA Wei, Qingyu , Yang, Yan , Liu, Haijun , Hou, Junyi , Liu, Maochang , Cao, Fei et al. Experimental study on direct solar photocatalytic water splitting for hydrogen production using surface uniform concentrators . (2018) : 13745-13753 .
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Toward the enhancement of activity and stability of CdxZn1-xS photocatalyst for solar hydrogen production EI SCIE Scopus
期刊论文 | 2017 , 42 (43) , 26597-26604 | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | IF: 4.229
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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Abstract :

The feasibility of solar hydrogen production from water has long relied on the activity and stability of a given photocatalyst. In this study, using CdxZn1-xS as a model photocatalyst, we demonstrated that the activity and stability of chalcogenide photocatalyst could be readily adjusted by changing the reaction conditions, including sacrificial reagents, reaction temperature. Our results showed that the combined use of proper sacrificial reagents play a key role against photocorrosion. Under optimized reaction conditions, the photo catalyst remained stable for more than 500 h. Under irradiation from a simulated sun light (light intensity: 789.92 W/m(2)), the average rate of hydrogen evolution reached 1.43 mmol/h with an energy conversion efficiency from solar to hydrogen of 6.22%. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Keyword :

Stability Solar hydrogen production Photocatalyst Activity

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GB/T 7714 Yang, Yan , Liu, Maochang , Wei, Qingyu et al. Toward the enhancement of activity and stability of CdxZn1-xS photocatalyst for solar hydrogen production [J]. | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY , 2017 , 42 (43) : 26597-26604 .
MLA Yang, Yan et al. "Toward the enhancement of activity and stability of CdxZn1-xS photocatalyst for solar hydrogen production" . | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 42 . 43 (2017) : 26597-26604 .
APA Yang, Yan , Liu, Maochang , Wei, Qingyu , Li, Jianfeng , Zhao, Liang . Toward the enhancement of activity and stability of CdxZn1-xS photocatalyst for solar hydrogen production . | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY , 2017 , 42 (43) , 26597-26604 .
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Rapid microfluidic mixer utilizing sharp corner structures EI SCIE Scopus
期刊论文 | 2017 , 21 (3) | MICROFLUIDICS AND NANOFLUIDICS | IF: 2.384
WoS CC Cited Count: 7 SCOPUS Cited Count: 6
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Abstract :

A novel microfluidic device for rapid and highthroughput fluid mixing is reported. The fluid mixing is based on the effect of a series of sharp corner structures in microchannel. The sharp corner induces fluid velocity components along the concentration gradient direction, stretching and folding the interfaces between different species. In addition, self-generated multilamellar fluid structures with small thickness are observed which significantly increase the interfacial contact area and reduce the diffusion length between different species. An optimal mixing efficiency of similar to 88.2% is achieved in less than 4.1 ms at the Reynolds number of 250. In comparison with other passive mixing methods, the present mixer is easy to fabricate and can effectively mix amounts of liquid in a very short time. With simple structure, high mixing efficiency and high throughput, this method can be potentially used in the fluid mixing in variety of lab-on-a-chip applications, such as analytic chemistry and clinic diagnosis.

Keyword :

Secondary flow Microchannel Microfluidic Passive mixing Mixer

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GB/T 7714 Fan, Liang-Liang , Zhu, Xiao-Liang , Zhao, Hong et al. Rapid microfluidic mixer utilizing sharp corner structures [J]. | MICROFLUIDICS AND NANOFLUIDICS , 2017 , 21 (3) .
MLA Fan, Liang-Liang et al. "Rapid microfluidic mixer utilizing sharp corner structures" . | MICROFLUIDICS AND NANOFLUIDICS 21 . 3 (2017) .
APA Fan, Liang-Liang , Zhu, Xiao-Liang , Zhao, Hong , Zhe, Jiang , Zhao, Liang . Rapid microfluidic mixer utilizing sharp corner structures . | MICROFLUIDICS AND NANOFLUIDICS , 2017 , 21 (3) .
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Experimental evaluation of scattering phase function and optimization of radiation absorption in solar photocatalytic reactors EI SCIE Scopus
期刊论文 | 2017 , 127 , 302-311 | APPLIED THERMAL ENGINEERING | IF: 3.771
WoS CC Cited Count: 2 SCOPUS Cited Count: 2
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Abstract :

Radiation absorption in photocatalytic reactors is usually simulated using the Monte Carlo (MC) stochastic method. In this article, MC is coupled with three different scattering phase functions: isotropic (ISO) phase function, diffuse reflecting large sphere (DR) phase function and Henyey-Greenstein (HG) phase function. Here, the model accuracy is examined via adequate experiments. The results show that phase function plays an important role in MC method. HG phase function is superior to ISO and DR phase functions because of small errors (less than 5%), and the value of the characteristic parameter g should be 0.64. The simulate results show that the absorption of solar radiation relates strongly to geometry configuration of reactors and catalyst concentration. The solar surface uniform concentrator (SUC) has a 9.94 times higher radiation absorption than the tubular reactor and realizes a uniform radiation distribution. The optimal catalyst concentrations of the SUC and the tubular reactor are 0.53 g/L and 0.68 g/L respectively. (C) 2017 Elsevier Ltd. All rights reserved.

Keyword :

Photocatalysis Monte Carlo method Scattering phase function Radiation absorption

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GB/T 7714 Hou, Junyi , Wei, Qingyu , Yang, Yan et al. Experimental evaluation of scattering phase function and optimization of radiation absorption in solar photocatalytic reactors [J]. | APPLIED THERMAL ENGINEERING , 2017 , 127 : 302-311 .
MLA Hou, Junyi et al. "Experimental evaluation of scattering phase function and optimization of radiation absorption in solar photocatalytic reactors" . | APPLIED THERMAL ENGINEERING 127 (2017) : 302-311 .
APA Hou, Junyi , Wei, Qingyu , Yang, Yan , Zhao, Liang . Experimental evaluation of scattering phase function and optimization of radiation absorption in solar photocatalytic reactors . | APPLIED THERMAL ENGINEERING , 2017 , 127 , 302-311 .
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