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Visual experimental study of Nanofluids application to promote CO_(2) absorption in a bubble column

Chinese Journal of Chemical Engineering 2024年第3期67卷 228-237页

作者： Shangyuan Cheng Guisheng Qi Yuliang Li Yixuan Yang Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering North University of ChinaTaiyuan 030051China

The addition of dispersed-phase nanoparticles in the liquid phase can enhance the gas-liquid transfer process as the suspended nanoparticles affect the transfer process inside the fluid through microdisturbance or micro-convection effects.In this article,a high-speed digital camera was used to visualize the bubble behavior of CO_(2) in pure water and Nanofluids to examine the effects of CO_(2) gas flow rate,nanoparticle solid content and type on the bubble behavior in the fluids.The CO_(2) absorption performance in three water-based Nanofluids were compared in a bubbler.And the mass transfer characteristics during CO_(2) bubble absorption and the reasons for the enhanced gas-liquid mass transfer effect of nanoparticles were analyzed.The results showed that the presence of nanoparticles affected the formation process of bubbles in the fluid,shortened the bubble detachment time,reduced the detachment diameter,effectively increased the gas-liquid contact area,and improved the bubbles detachment frequency.The system with MCM-41 corresponded to a higher overall mass transfer coefficient.Uncalined MCM-41 contained surfactant that enhanced foaming behavior in water.This prevented the transfer of CO_(2) to some extent,and the CO_(2) absorption by uncalined MCM-41/H_(2)O was 5.34%higher than that by pure water.Compared with SiO_(2) nanoparticles with the same particle size and the same composition,MCM-41 had a higher adsorption capacity and better hydrophilicity due to its larger specific surface area and rich porous structure,which was more favorable to accelerate the collision between nanoparticles and CO_(2) bubbles to cause micro-convection.Under the condition of 0.1%(mass)solid content,the enhancement of CO_(2) absorption process by MCM-41 nanoparticles was more significant and improved by 16.9%compared with pure water.

关键词： Nanofluids CO_(2) absorption Mass transfer MCM-41 Bubble column

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Multiphysics of multifunctional Nanofluids based on different oxides nanoparticles and glycerol fluid

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Particuology 2023年第5期76卷 46-62页

作者： R.J.Sengwa Mukul Saraswat Dielectric Research Laboratory Department of PhysicsJai Narain Vyas UniversityJodhpur342005India

Nanofluid(NF)materials consisting of glycerol(Gly)and different inorganic nano oxides(TiO_(2),ZnO,Al_(2)O_(3),and SiO_(2) for the oxides concentration of 0.01 wt%to the weight of Gly base fluid)were prepared by a two-step method through ultrasonic cavitation process.These Nanofluids were investigated by employing an X-ray diffractometer(XRD),ultraviolet-visible(UV-Vis)spectrophotometer,20 Hz to 1 MHz frequency range dielectric relaxation spectroscopy(DRS),ultrasonic interferometer,and rotational viscometer.The multiphysics of these Nanofluids includes structural and optical properties,dielectric permittivity,electrical conductivity,conductivity relaxation,ultrasound velocity,adiabatic compress-ibility,acoustic impedance,viscosity,density,thermal conductivity,and viscoacoustic relaxation were characterized.The XRD patterns identified monodispersed and stable suspensions of these different characteristic nanoparticles in the hydrogen-bonded 3D supramolecular structure of ultra-high viscous glycerol fluid which were supported by their UV-Vis absorbance analyses.The energy band gap values of the TiO_(2)and ZnO containing Nanofluids were found primarily ruled by the characteristic optical prop-erties of these oxides nanomaterials.The complex dielectric and various electrical functions studied at 25℃revealed that the suspension of different oxide nanoparticles in the glycerol fluid increased the static permittivity whereas reduced the direct current electrical conductivity which showed strong conductivity relaxation process dependence.The rheological measurements of the formulated Nanofluids were performed over a shear rate range of 0.4-40 s^(-1)at temperatures of 25-55℃.The linear rela-tionship between shear rate and shear stress and also the shear rate-independent viscosity revealed the Newtonian behaviour of these Nanofluids.The shear viscosity non-linearly decreased with the increase of temperature and exhibited the Arrhenius behaviour for all different oxides containing Gly-based Nanofluids.The acoustic parameters

关键词： Glycerol Nano oxides Nanofluids Optical properties Dielectric properties Thermophysical parameters

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Experimental Study on Thermal Properties and Light-to-Thermal Conversion Performance of Ionic Liquids Based Nanofluids

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Journal of Thermal Science 2023年第6期32卷 1956-1972页

作者： LIU Changhui SHI Xiancong GAO Ding CAO Yuqi GU Yanlong RAO Zhonghao School of Low-carbon Energy and Power Engineering China University of Mining and TechnologyXuzhou221116China School of Chemistry and Chemical Engineering Huazhong University of Science and TechnologyWuhan430074China School of Chemistry and Chemical Engineering The Key Laboratory for Green Processing of Chemical Engineering of Xinjiang BingtuanShihezi UniversityShihezi832003China School of Energy and Environmental Engineering Hebei University of TechnologyHebei300130China

As a new type of energy transport medium with high efficiency and high heat transfer performance,Nanofluids have shown broad application prospects in the fields of thermodynamics,solar heat collection,microelectronics,thermal energy,and material science.The wide liquid range and environmental properties of ionic liquids have drawn ample attention to their application when used as a working fluid,especially as a base solvent of Nanofluids.The ionic liquid-based Nanofluids were prepared by a two-step method using 1-ethyl-3-methylimidazole trifluoroacetate ionic liquid as a base solvent and graphene oxide(GO)as a nanofiller.Thermophysical properties study reveals that the thermal conductivity could be enhanced by 3.0%with the addition of 0.05 wt%GO,and the viscosity and the specific heat capacity were also subject to study as a function of testing temperature and concentration of nanofiller.Additionally,the photothermal conversion efficiency of these Nanofluids was studied comprehensively under different conditions.The results show that the photothermal conversion efficiency can reach 83%within an irradiation time of 6000 s and the highest temperature of the Nanofluids is up to 105.89℃with a maximum photothermal conversion efficiency increase by 29%.

关键词： Nanofluids ionic liquid GO photothermal conversion

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Synthesis of Nanofluids composed of deep eutectic solvents and metal-modified MCM-41 particles as multifunctional promoters for fuel oil desulfurization

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Frontiers of Chemical Science and Engineering 2023年第11期17卷 1776-1787页

作者： Jing-Xuan Zhang Xuan Wang Yan-Ru Feng Jia-Yu An Yu-Xuan Chi Ya-Tai Liu Ling-Fei Zhang Yun-Bo Zhao Xiang-Feng Zeng Zi-Bo Wang Jia-Shuai Liu Yi-Fan Wang Shuai-Yong Dou Er-Hong Duan Tao Meng School of Environmental Science and Engineering Hebei University of Science and TechnologyShijiazhuang 050018China National Joint Local Engineering Research Center for Volatile Organic Compounds and Odorous Pollution Control Shijiazhuang 050018China College of Science Hebei Agricultural UniversityBaoding 071001China

Compared with traditional hydrodesulfurization,new nonhydrodesulfurization methods have the advantage of a high removal efficiency for thiophene compounds under mild conditions.However,independent nonhydrodesulfurization technologies are faced with their own shortcomings,such as limitations of the desulfurization performance and regeneration of materials.To overcome these limitations,four Nanofluids were prepared by dispersing different metal-modified MCM-41 particles in deep eutectic solvent as multifunctional promoters to develop a comprehensive desulfurization method.Based on the excellent adsorbability and high catalytic activity of the dispersed particles and the outstanding extractability of deep eutectic solvent in Nanofluids,a high sulfur removal of 99.33%was achieved for model oil under mild conditions in 15 min.The Nanofluids also showed excellent reusability due to their high structural stability.In addition,NF@Cu/Al-MCM-41-2.5%exhibited the best desulfurization performance among the prepared Nanofluids.This result was obtained because the introduction of Al ions increased the number of acid sites and defect sites to improve the catalytic activity and adsorbability,and the best affinity of Cu/Al-MCM-41 for the deep eutectic solvent favored the reaction mass transfer.This work opens the door to the development of a comprehensive nonhydrodesulfurization method based on the design of nanofluid materials.

关键词： fuel oil desulfurization Nanofluids catalytic ozonation

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Recyclable Fe_(3)O_(4)@Polydopamine(PDA) Nanofluids for highly efficient solar evaporation

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Green Energy & Environment 2022年第1期7卷 35-42页

作者： Qingmiao Wang Yi Qin Feifei Jia Shaoxian Song Yanmei Li Hubei Key Laboratory of Mineral Resources Processing and Environment Wuhan University of TechnologyWuhanHubei Province430070China Department of Mines Metallurgy and Geology EngineeringUniversity of GuanajuatoGuanajuato36000Mexico School of Resources and Environmental Engineering Wuhan University of TechnologyWuhanHubei Province430070China

Volumetric solar evaporations by using light-absorbing nanoparticles suspended in liquids(Nanofluids)as solar absorbers have been widely regarded as one of the promising solutions for clean water production because of its high efficiency and low capital cost compared to traditional solar distillation systems.Nevertheless,previous solar evaporation systems usually required highly concentrated solar irradiation and high capital cost,limiting the practical application on a large scale.Herein,for the first time in this work,polydopamine(PDA)-capped nano Fe_(3)O_(4)(Fe_(3)O_(4)@PDA)Nanofluids were used as solar absorbers in a volumetric system for solar evaporation.The introduction of organic PDA to nano Fe_(3)O_(4)highly contributed to the high light-absorbing capacity of over 85%in wide ranges of 200–2400 nm because of the existence of numerous carbon bonds and pi(π)bonds in PDA.As a result,high evaporation efficiency of 69.93%under low irradiation of 1.0 kW m^(-2)was achieved.Compared to other Nanofluids,Fe_(3)O_(4)@PDA Nanofluids also provided an advantage in high unit evaporation rates.Moreover,Fe_(3)O_(4)@PDA Nanofluids showed excellent reusability and recyclability owing to the preassembled nano Fe_(3)O_(4),which significantly reduced the material consumptions.These results demonstrated that the Fe_(3)O_(4)@PDA Nanofluids held great promising application in highly efficient solar evaporation.

关键词： Fe_(3)O_(4)@Polydopamine Nanofluids Volumetric solar evaporation Recyclability

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Prediction and Optimization of the Thermal Properties of TiO_(2)/Water Nanofluids in the Framework of a Machine Learning Approach

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Fluid Dynamics & Materials Processing 2023年第8期19卷 2181-2200页

作者： Jiachen Li Wenlong Deng Shan Qing Yiqin Liu Hao Zhang Min Zheng Sate Key Laboratory of Complex Nonferrous Clean Utilization Kunming University of Science and TechnologyKunming650093China Faculty of Metallurgical and Energy Engineering Kunming University of Science and TechnologyKunming650093China Jiangxi Guoxing Intelligent Energy Co. Ganzhou330300China Faculty of Media and Information Engineering Yunnan Open UniversityKunming650500China

In this study,comparing multiple models of machine learning,a multiple linear regression(MLP),multilayer feed-forward artificial neural network(BP)model,and a radial-basis feed-forward artificial neural network(RBF-BP)model are selected for the optimization of the thermal properties of TiO_(2)/water Nanofluids.In particular,the least squares support vector machine(LS-SVM)method and radial basis support vector machine(RB-SVM)method are implemented.First,curve fitting is performed by means of multiple linear regression in order to obtain bivariate correlation functions for thermal conductivity and viscosity of the nanofluid.Then the aforementioned models are used for a predictive analysis of the dependence of its thermal conductivity and viscosity on temperature and volume fraction.The results show that the least squares support vector machine(LS-SVM)has a prediction accuracy higher than the other models.The model predicts the thermal conductivity of TiO_(2)/water MSE=1.0853×10^(-6),R2=0.99864,MAE=0.00092,RMSE=0.00104,and the viscosity of TiO_(2)/water MSE=8.1397×10^(-6),R2=0.99995,MAE=0.00074,RMSE=0.0009.

关键词： Nanofluids viscosity thermal conductivity machine learning predictive modeling

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A Review of Methods Based on Nanofluids and Biomimetic Structures for the Optimization of Heat Transfer in Electronic Devices

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Fluid Dynamics & Materials Processing 2022年第5期18卷 1205-1227页

作者： Lanqi Chen Yuwei Wang Cong Qi Zhibo Tang Zhen Tian School of Low-Carbon Energy and Power Engineering China University of Mining and TechnologyXuzhou221116China

Nowadays,the utilization rate of electronic products is increasing while showing no obvious sign of reaching a limit.To solve the associated“internal heat generation problem”,scientists have proposed two methods or strategies.The first approach consists of replacing the heat exchange medium with a nanofluid.However,the high surface energy of the nanoparticles makes them prone to accumulate along the heat transfer surface.The second method follows a different approach.It tries to modify the surface structure of the electronic components in order to reduce the fluid-dynamic drag and improve the rate of heat exchange.This article reviews these effects considering different types of nanofluid and different shapes,sizes,and arrangements of“biomimetic grooves”.The idea to use these two methods in a combined fashion(to improve heat transfer and reduce flow resistance at the same time)is also developed and discussed critically to a certain extent.

关键词： Nanofluids biomimetic structure drag reduction characteristic thermal management

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Modeling and investigating the detailed characteristics of solar lighting/heating system based on spectrum split of Nanofluids

能源与人工环境(英文)

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能源与人工环境(英文) 2022年第1期3卷 30-39页

作者： Chao Shen Guoquan Lv Kaijie Zheng Changyun Ruan Chunxiao Zhang Yu Dong School of Architecture Harbin Institute of TechnologyKey Laboratory of Cold Region Urban and Rural Human Settlement Environment Science and TechnologyMinistry of Industry and Information TechnologyHarbin 150090China

Solar lighting technologies can lead sunlight into indoor actively,which has been proved that has great potential to reduce electric lighting consumption and create a healthy visual environment.In this paper,a mathematics model was developed to explore performance characteristics and economic applicability of solar lighting/heating system that combine ordinary solar lighting system with Nanofluids to spectroscopically utilize sunlight.The results show that the luminous efficiency of output visible light can reach at 242 lm/W,which is 1.62-2.42 times higher than that of current LED light.Moreover,it can be found that the energy-saving capacity of this system is remarkable when used in most areas of China.As for Harbin,its annual total solar radiation ranges 4190 MJ/m^(2)to 5020 MJ/m^(2),the system’s annual output energy(per square meter of collection area)is 188.15 kW·h for daylighting and 248.2 kW•h for domestic hot water.Besides,the integrated using of infrared radiation can improve the economy of solar lighting technologies by calculating the comprehensive price of unit output energy.

关键词： Solar lighting Solar energy Full spectrum Nanofluids

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Application of Superhydrophobic Surface on Boiling Heat Transfer Characteristics of Nanofluids

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Energy Engineering 2021年第4期118卷 825-852页

作者： Cong Qi Yuxing Wang Zi Ding Jianglin Tu Mengxin Zhu School of Electrical and Power Engineering China University of Mining and TechnologyXuzhou221116China

Boiling heat transfer is a mode using the phase change of working medium to strengthen the heat exchange due to its good heat exchange capability,and it is widely used in heat exchange engineering.Nanofluids have been used in the direction of enhanced heat transfer for their superior thermophysical property.The wetting,spreading and ripple phenomena of superhydrophobic surfaces widely exist in nature and daily life.It has great application value for engineering technology.In this article,the boiling heat exchange characteristics of Nanofluids on superhydrophobic surface are numerically studied.It was found that with the increase of superheating degree,the steam volume ratio of unmodified heated surface increases to saturation,while the steam volume and evaporation ratio of modified superhydrophobic surface increase firstly and then decrease.At the same time,bubbles are generated and accumulated more fully on superhydrophobic surface.It was also found that Nanofluids with low viscosity are more affected by superhydrophobic surface characteristics,and the increase is more significant with high superheating degree,and the superhydrophobic surface is beneficial to enhancing boiling heat exchange.Compared with the simulation results,it could be concluded that the boiling heat exchange performance of CuO-water nano-fluids on the modified superhydrophobic surface is better than that of CuO-ethylene glycol Nanofluids under high superheating degree.

关键词： Nanofluids superhydrophobic surface pool boiling heat transfer numerical simulation

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Influence of heat flux and Reynolds number on the entropy generation for different types of Nanofluids in a hexagon microchannel heat sink

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Chinese Journal of Chemical Engineering 2019年第3期27卷 501-513页

作者： A.A.Alfaryjat A.Dobrovicescu D.Stanciu Faculty of Mechanical Engineering and Mechatronics University Politehnica of Bucharest Splaiul Independentei nr.313

Based on the Second Law of Thermodynamics, the entropy generation is studied for laminar forced convection flow of different nanoparticles(AlO, CuO and SiO) mixed with water through a hexagon microchannel heat sink(HMCHS). The effects of different heat fluxes and Reynolds numbers on the entropy generation for different Nanofluids, volume fractions and nanoparticles diameter are investigated. The heat flux is in the range of 125 to 500 kW·mand the Reynolds numbers vary between 200 and 1500. The thermal, frictional and total entropy generations are calculated by integrating the volumetric rate components over the entire HMCHS. The results clearly show that the rise in the heat flux leads to an increase in the thermal entropy generation for Nanofluids and pure water but they don’t have any influence on the frictional entropy generation. Moreover, when the Reynolds number increases, the frictional entropy generation increases while the thermal entropy generation decreases. The results revealed that at low heat fluxes and high Reynolds numbers, pure water gives the lowest entropy generation, while at high heat flux the nanofluid has to be used in order to lower the overall irreversibility.

关键词： Microchannel heat sink Nanofluids Entropy generation Numerical analysis Laminar flow

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