International Journal of Fluid Engineering最新文献

Transport of nonspherical particles in non-Newtonian fluid: A review 非球形颗粒在非牛顿流体中的传输：综述

International Journal of Fluid Engineering Pub Date : 2024-08-09 DOI: 10.1063/5.0207148

Xiao Hu, Longfei Yu, Nebiyu Tariku Atomsa, Hongrui Zhao

引用次数: 0

Experimental study of drag characteristics and dust removal performance of a hybrid wet-filter precipitator 混合式湿式除尘器的阻力特性和除尘性能实验研究

International Journal of Fluid Engineering Pub Date : 2024-07-25 DOI: 10.1063/5.0206725

H. Yi, Zifeng Yang, Deqiang Chang, Xinjiao Tian, Jingxian Liu

{"title":"Experimental study of drag characteristics and dust removal performance of a hybrid wet-filter precipitator","authors":"H. Yi, Zifeng Yang, Deqiang Chang, Xinjiao Tian, Jingxian Liu","doi":"10.1063/5.0206725","DOIUrl":"https://doi.org/10.1063/5.0206725","url":null,"abstract":"With their advantages of high dust removal efficiency and low drag characteristics, hybrid wet-filter precipitators have great potential for dust control in coal mines, but the underlying mechanisms are not well understood. In this study, to help fill this knowledge gap, a hybrid wet-filter precipitator consisting of a 40-layer metal filter and a defogger device is designed and a prototype is constructed. Experiments are conducted to investigate its drag characteristics under wind velocities from 0.85 to 5.68 m/s and its dust removal performance under wind velocities of 2 and 4 m/s. On the basis of results with the initial design, which show that the dust removal efficiency does not meet the target value of 99%, two rounds of improvement are implemented to enhance the dust removal efficiency. Results show that the defogger device contributes ∼80% of the total drag. The drag from the metal filters is found to increase by over 80% on average after sampling, since some of dust particles are left on the filters, decreasing their porosity. The installation of two-layer air filters on the leeside of the metal filter unit is found to increase the efficiency to 99.89% and 99.80% under wind velocities of 2 and 4 m/s, respectively, although this is at the cost of increased drags. Additionally, it is found that the replacement of the defogger by a 20-layer metal filter is not desirable, since this increases the downstream air humidity to more than 100%, which can cause damage to the centrifugal blower system. Therefore, new designs for the defogger device need to be examined in future studies.","PeriodicalId":517827,"journal":{"name":"International Journal of Fluid Engineering","volume":"12 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141803264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A coupled modeling framework for investigating flow maldistribution in cross-flow-corrugated plate heat exchangers 用于研究横流波纹板式热交换器中流量分布不均问题的耦合建模框架

International Journal of Fluid Engineering Pub Date : 2024-07-08 DOI: 10.1063/5.0204274

Haowen Li, Xiaomei Guo, Marat A. Belotserkovsky, Aleksandr N. Grigorchik, V. Kukareko, Zheng Bo

{"title":"A coupled modeling framework for investigating flow maldistribution in cross-flow-corrugated plate heat exchangers","authors":"Haowen Li, Xiaomei Guo, Marat A. Belotserkovsky, Aleksandr N. Grigorchik, V. Kukareko, Zheng Bo","doi":"10.1063/5.0204274","DOIUrl":"https://doi.org/10.1063/5.0204274","url":null,"abstract":"Accurate prediction of the impact of flow maldistribution on the thermo-hydraulic behavior of plate heat exchangers is important for thermal design and optimization in a number of practical applications. In this paper, a coupled modeling framework, consisting of a heat transfer model and a hydraulic model, is proposed for quantitatively evaluating the impact of maldistribution on the thermo-hydraulic performance of a cross-flow-corrugated plate heat exchanger. The numerical results of the proposed approach are validated by comparison with experimental data. Using the coupled model, the flow distribution nonuniformity, heat exchanger effectiveness deteriorations, and pressure drop deviations are analyzed. Furthermore, the combined effects of side stream maldistribution are investigated for different inlet Reynolds numbers and inlet temperatures. The results demonstrate that when the inlet gas Reynolds number is in the range of 1100–2700, nonuniform distribution of the gas side will cause air maldistribution, and a 10%–30% effectiveness deterioration rate. It is found that air maldistribution will not result in gas maldistribution when the inlet air Reynolds number is in the range of 6000–18 000, but increasing air nonuniformity. Will lead to increasing deterioration in heat exchanger effectiveness. In the presence of air and gas flow maldistribution, the pressure drops on the gas and air sides increase by 5% and less than 12.4%, respectively. This work provides a computational framework for optimization of cross-flow-corrugated plate heat exchangers to achieve desired thermo-hydraulic performance.","PeriodicalId":517827,"journal":{"name":"International Journal of Fluid Engineering","volume":" January","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141669673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Studies on the inhibitory effect of different surfactants on ammonium chloride corrosion 不同表面活性剂对氯化铵腐蚀的抑制作用研究

International Journal of Fluid Engineering Pub Date : 2024-06-01 DOI: 10.1063/5.0193079

Dexiao Fu, Xishui Yu, Xin Huang, Guofu Ou, Tongzao Zhou, Zhenqian He

{"title":"Studies on the inhibitory effect of different surfactants on ammonium chloride corrosion","authors":"Dexiao Fu, Xishui Yu, Xin Huang, Guofu Ou, Tongzao Zhou, Zhenqian He","doi":"10.1063/5.0193079","DOIUrl":"https://doi.org/10.1063/5.0193079","url":null,"abstract":"Corrosion of heat exchangers by ammonium chloride (NH4Cl) is a common occurrence in the refineries. A variety of methods have been adopted to prolong the service life of equipment in such circumstances, such as the use of various additives such as surfactants or by washing with water. In this paper, a series of experiments are performed to investigate the effects of different surfactants (cationic, anionic, amphoteric, and nonionic) on NH4Cl corrosion using the sessile drop technique and electrochemical measurements. The results show that the presence of a surfactant can increase the wettability of an NH4Cl solution, decreasing the contact angle between the solution and a test material. The surface tension of an NH4Cl solution containing an anionic surfactant is the lowest, but the self-corrosion potential of such a solution is the greatest. The addition of a cationic surfactant has no inhibitory effect on corrosion, and indeed increases the corrosion rate. However, with a nonionic surfactant, it is possible to significantly decrease the corrosion rate of an NH4Cl solution, although the inhibitory effect decreases with increasing temperature.","PeriodicalId":517827,"journal":{"name":"International Journal of Fluid Engineering","volume":"57 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141404838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanism analysis of the vortex ring and its effects on an axial descending rotor 涡流环的机理分析及其对轴向下降转子的影响

International Journal of Fluid Engineering Pub Date : 2024-05-09 DOI: 10.1063/5.0200688

Lifang Zeng, Zeming Gao, Tianyu Xu, Liangquan Wang

{"title":"Mechanism analysis of the vortex ring and its effects on an axial descending rotor","authors":"Lifang Zeng, Zeming Gao, Tianyu Xu, Liangquan Wang","doi":"10.1063/5.0200688","DOIUrl":"https://doi.org/10.1063/5.0200688","url":null,"abstract":"A vortex ring is a flow phenomenon involving a complex toroidal vortex system. When a rotor is in descending flight, it may enter the vortex ring state (VRS), which will affect the rotor’s aerodynamic characteristics and even endanger it. In this paper, to clarify the aerodynamic mechanism by which the vortex ring exerts its effects on an axial descending rotor, an unsteady numerical simulation method for the rotor integrated with structured moving overset grids is proposed and validated using experimental data. This numerical simulation method is then applied to analyze the aerodynamic characteristics of the rotor in descending flight. The variations of the aerodynamic forces and the flow characteristics in the slipstream are analyzed to elucidate the physical mechanisms responsible for the relationships between the aerodynamic loads, flow field, and vortices when the rotor is in the VRS. The effects of the VRS cause a sharp drop in the average aerodynamic forces, which directly affects the safety and reliability of a rotor aircraft. In the slipstream of the descending rotor, a distinct vortex ring forms and moves upward as the velocity of descent increases. The most severe VRS occurs at a nondimensional velocity of descent of 1.13 when the center of the highly unsteady vortex ring is right at the blade tip, and this can be used as an indicator of the VRS. The physical mechanism by which the VRS exerts its effects can be attributed to the low pressure induced by strong vortices. The VRS decreases the pressure on the lower surface of the blade and increases the pressure on the upper surface, resulting in a reduction in the aerodynamic loads. In comparison with the hovering state, the VRS results in a much larger vortex strength and possesses a different vortex structure.","PeriodicalId":517827,"journal":{"name":"International Journal of Fluid Engineering","volume":" 23","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140996394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Flow across a circular cylinder in an inclined channel stabilized by buoyancy 通过浮力稳定倾斜通道中圆形圆柱体上的水流

International Journal of Fluid Engineering Pub Date : 2024-04-10 DOI: 10.1063/5.0201281

Wei Zhang, Ravi Samtaney

{"title":"Flow across a circular cylinder in an inclined channel stabilized by buoyancy","authors":"Wei Zhang, Ravi Samtaney","doi":"10.1063/5.0201281","DOIUrl":"https://doi.org/10.1063/5.0201281","url":null,"abstract":"In this study, flow across a circular cylinder confined in an inclined channel is considered, with account taken of mixed convection. Cases with opposing or aiding buoyancy that is not in alignment with the incoming flow are considered, and it is found that the flow around and in the wake of the cylinder is affected. The effects of inclination and buoyancy on the flow and heat transfer patterns are investigated, with a focus on the stabilization and destabilization of flow by these two factors. Simulation results are analyzed with regard to the flow field, lift and drag forces, heat transfer, the deviation of separation and through-flow in the channel, and the temperatures on the channel walls. The flow is more strongly destabilized by an opposing buoyancy, but can be fully stabilized by an aiding buoyancy in an inclined channel. The drag on the cylinder is minimized around a critical Richardson number Ricr. The inclination of the channel has significant effects on the local heat transfer on the cylinder and on the characteristics of the through-flow. The pattern of the wake flow, i.e., whether it is steady or unsteady, affects the heating of the channel walls.","PeriodicalId":517827,"journal":{"name":"International Journal of Fluid Engineering","volume":"1987 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140719217","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A modified CFD-DEM method for accurate prediction of the minimum fluidization velocity 精确预测最小流化速度的改进型 CFD-DEM 方法

International Journal of Fluid Engineering Pub Date : 2024-04-04 DOI: 10.1063/5.0200589

Xuan He, Yaxiong Yu, Zhouzun Xie, Qiang Zhou

引用次数: 0

Bi-reforming with a ratio of CH4/CO2/H2O = 3/1/2 by gliding arc plasma catalysis for power to fuels 通过滑行电弧等离子体催化技术实现 CH4/CO2/H2O = 3/1/2 比率的双转化，将动力转化为燃料

International Journal of Fluid Engineering Pub Date : 2024-04-03 DOI: 10.1063/5.0197581

Jing‐Lin Liu, Aimin Zhu

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A review of bubble collapse near particles 微粒附近气泡坍塌研究综述

International Journal of Fluid Engineering Pub Date : 2024-03-28 DOI: 10.1063/5.0193451

Jiaxin Yu, Jinxin Luo, Yiming Li, Yuning Zhang

引用次数: 0

Multiscale modeling and simulation of turbulent flows in porous media 多孔介质中湍流的多尺度建模与模拟

International Journal of Fluid Engineering Pub Date : 2024-03-01 DOI: 10.1063/5.0190279

Yan Jin, Andrey V. Kuznetsov

{"title":"Multiscale modeling and simulation of turbulent flows in porous media","authors":"Yan Jin, Andrey V. Kuznetsov","doi":"10.1063/5.0190279","DOIUrl":"https://doi.org/10.1063/5.0190279","url":null,"abstract":"Numerical simulation is an important tool for understanding the physics of flows in porous media and for making predictions. The state of the art of multiscale modeling and simulation of turbulent flows in porous media is reviewed in this paper. Numerical simulations of flows in porous media can be classified as microscopic simulations, in which both macroscopic and pore-scale flows are directly resolved, and macroscopic simulations, in which the pore-scale motions are modeled while the volume-averaged equations are solved. Studies in the past few years have shown that microscopic simulations improve the understanding of turbulent flows in porous media considerably; this motivates the development of more efficient and more accurate turbulence models for macroscopic simulations. On the basis of this review, we believe that simulation of flows with higher Reynolds numbers, understanding the transport of macroscopic turbulence, modeling of turbulent flows in inhomogeneous and anisotropic porous media, simulation of compressible and multiphase turbulent flows in porous media, and fluid–structure interaction in deformable porous matrices are important topics to be studied in the future.","PeriodicalId":517827,"journal":{"name":"International Journal of Fluid Engineering","volume":"261 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140286805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0