Journal of Fluids Engineering最新文献_第5页

Analysis of Electroosmotically Modulated Peristaltic Transport of Third Grade Fluid in a Microtube Considering Slip-Dependent Zeta Potential 考虑到滑动依赖性 Zeta 电位的微管中三级流体的电渗调制蠕动传输分析

Journal of Fluids Engineering Pub Date : 2024-03-05 DOI: 10.1115/1.4064997

Kaushik Mahanta, D. Banerjee, Priyanshu Bariar, Pawan Kumar Sah, Shamsul Arefin, Sukumar Pati, Pankaj Biswas

{"title":"Analysis of Electroosmotically Modulated Peristaltic Transport of Third Grade Fluid in a Microtube Considering Slip-Dependent Zeta Potential","authors":"Kaushik Mahanta, D. Banerjee, Priyanshu Bariar, Pawan Kumar Sah, Shamsul Arefin, Sukumar Pati, Pankaj Biswas","doi":"10.1115/1.4064997","DOIUrl":"https://doi.org/10.1115/1.4064997","url":null,"abstract":"\u0000 The present study investigates electroosmotically modulated peristaltic transport of third-grade fluid through a microtube taking into consideration the intricate coupling of zeta potential and hydrodynamic slippage. The analytical results encompass the mathematical expressions for dimensionless electrical potential distribution as well as series solutions for stream function and axial pressure gradient up to first order utilizing the perturbation technique for small Deborah number coupled with the Cauchy product for infinite series. Critical values and ranges of wavelength have been obtained where the axial pressure gradient vanishes. Moreover, pivotal values and ranges of wavelength have also been noted for the invariance of pressure gradient with respect to Deborah number as well as Debye-Hückel parameter. Trapping phenomenon has also been investigated by contours of streamlines wherein the zones of recirculation or trapped boluses are formed predominantly near the microtube walls. Additionally, the relative enhancement in hydrodynamic slippage amplifies the trapped bolus size, whereas, a diminishing behavior on bolus size is observed by the electroosmotic parameter.","PeriodicalId":504378,"journal":{"name":"Journal of Fluids Engineering","volume":"132 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140078604","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

Experimental and Numerical Evaluations of Dynamic Transfer Matrix for a Three-Dimensional Centrifugal Impeller Based On Unsteady Energy Conservation 基于非稳态能量守恒的三维离心叶轮动态传递矩阵的实验和数值评估

Journal of Fluids Engineering Pub Date : 2024-03-05 DOI: 10.1115/1.4064996

Izuru Kambayashi, Chengye Dou, Donghyuk Kang

{"title":"Experimental and Numerical Evaluations of Dynamic Transfer Matrix for a Three-Dimensional Centrifugal Impeller Based On Unsteady Energy Conservation","authors":"Izuru Kambayashi, Chengye Dou, Donghyuk Kang","doi":"10.1115/1.4064996","DOIUrl":"https://doi.org/10.1115/1.4064996","url":null,"abstract":"\u0000 Under unsteady operating conditions in turbomachinery, the performance is unable to respond rapidly enough to follow characteristic curves for the steady condition. To design a reliable turbomachinery under unexpected unsteady conditions, we evaluated the dynamic transfer matrix of a three-dimensional centrifugal impeller. The working fluid is incompressible air. To make the current results more applicable in a broader sense such as pumps, all parameters and results were normalized. The experimental results showed a more significant negative slope in the unsteady performance curve compared to that in the steady performance curve. This was mainly caused by the phase delay of the pressure rise to the pulsating flow rate. We clarified the changes in gain and phase delay under unsteady conditions by conducting numerical simulations. The numerical results showed that the unsteady pressure rise was primarily generated by inertia and power terms in the unsteady energy conservation equation. The power term was predominantly influenced by the angular momentum flow rate difference and the change rate of angular momentum. Each term was quantitatively evaluated, and its contribution to the unsteady pressure rise was discussed. Within the range of frequencies tested in this study, the transfer matrix for the three-dimensional centrifugal impeller could be effectively approximated through a first-order lag approximation considering a series-connected derivative system. We believe that our findings can be extended to centrifugal pumps when disregarding the compressibility effects such as cavitation.","PeriodicalId":504378,"journal":{"name":"Journal of Fluids Engineering","volume":"211 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140265002","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

Validation of a RANS CFD Model for a S833 Wind Turbine Airfoil with a Trailing Edge Flap Using Oil Visualization and Pressure Taps 利用油可视化和压力抽头验证带有后缘襟翼的 S833 风力涡轮机机翼的 RANS CFD 模型

Journal of Fluids Engineering Pub Date : 2024-02-28 DOI: 10.1115/1.4064853

Rafat Jami, David A. Johnson

{"title":"Validation of a RANS CFD Model for a S833 Wind Turbine Airfoil with a Trailing Edge Flap Using Oil Visualization and Pressure Taps","authors":"Rafat Jami, David A. Johnson","doi":"10.1115/1.4064853","DOIUrl":"https://doi.org/10.1115/1.4064853","url":null,"abstract":"\u0000 The aerodynamics of a small wind turbine blade was captured using a γ - Reθ k - ω SST transitional turbulence model tuned with production limiter coefficients at a Reynolds number of 1.70×10^5. The CFD simulations were validated against wind tunnel experiments that included airfoil pressure tap measurements and surface oil flow visualization (SOFV) to capture the flow field. The uniqueness of this blade included a trailing edge flap that was 20% of the chord controlled using a servomotor. The test matrix included angle of attack (AOA) between 1° and 7° with flap angles of 10° in the upward and downward position. Two locations were always observed on the airfoil: a leading edge region of high shear, a midsection of flow separation. Within the flow separation section, two distinct regions existed: a complete detachment of flow from the airfoil surface creating a stagnation region which was followed by a reverse flow region. A third location of flow reattachment near the trailing edge was observed for all cases excluding a downward angled trailing edge flap. The utilization of the flap resulted in changes to the size of the separation zone and the movement of the separation zone along the chord. The numerical skin friction coefficient, oil residue profiles from the SOFV and pressure tap measurements all showed onset of separation locations on the chord within 10%. The CFD model also predicted the coefficient of pressure across the chord of the airfoil within 10% in comparison to the experimental measurements.","PeriodicalId":504378,"journal":{"name":"Journal of Fluids Engineering","volume":"85 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140421639","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

The Interaction of Turbulent Spots with Low-Speed Streaks 湍流热点与低速条纹的相互作用

Journal of Fluids Engineering Pub Date : 2024-02-28 DOI: 10.1115/1.4064852

S. Suryanarayanan, Anthony Settlemier, David Goldstein

引用次数: 0

A Multiscale Euler–Lagrange Model for High-Frequency Cavitation Noise Prediction 用于高频气蚀噪声预测的多尺度欧拉-拉格朗日模型

Journal of Fluids Engineering Pub Date : 2024-02-22 DOI: 10.1115/1.4064296

Xincheng Wang, Mingtai Song, Huaiyu Cheng, Bin Ji, Linmin Li

引用次数: 1

Large Eddy Simulation of a Turbulent Polydisperse Spray Flow: a Comparative Study of Subgrid Scale Models and Droplet Injection Models 湍流多分散喷雾流的大涡流模拟：亚网格尺度模型与液滴喷射模型的比较研究

Journal of Fluids Engineering Pub Date : 2024-02-14 DOI: 10.1115/1.4064760

Teng Zhang, Jinghua Li, Yingwen Yan, Yuxin Fan

{"title":"Large Eddy Simulation of a Turbulent Polydisperse Spray Flow: a Comparative Study of Subgrid Scale Models and Droplet Injection Models","authors":"Teng Zhang, Jinghua Li, Yingwen Yan, Yuxin Fan","doi":"10.1115/1.4064760","DOIUrl":"https://doi.org/10.1115/1.4064760","url":null,"abstract":"\u0000 This study performs an investigation of the effects of the subgrid-scale and droplet injection models in the large eddy simulation (LES) of turbulent two-phase spray flows. Three LES subgrid-scale (SGS) models (Smagorinsky, wall-adapting local eddy viscosity, and dynamic Smagorinsky) and two droplet injection models (cone nozzle injection and conditional droplet injection) are validated to the experimental measurements. For both gaseous and liquid phases, all SGS models provide comparable results, indicating that the current two-phase flow field does not exhibit a pronounced sensitivity to the LES SGS model. As for different droplet injection models and spray dispersion angles, minimal differences are observed in the prediction of the gaseous mean and RMS velocity profiles. However, for the result of liquid phase, CDIM (conditional droplet injection model) predictions of the droplet mean diameter and velocity are in better agreement with experiments, and less sensitive to spray dispersion angle settings. While the CNIM (cone nozzle injection model) prediction of droplet diameter is less accurate when increasing the dispersion angle. The study suggests that turbulent two-phase spray flows are more influenced by the spray boundary conditions rather than the LES SGS models.","PeriodicalId":504378,"journal":{"name":"Journal of Fluids Engineering","volume":"32 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139776988","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

Large Eddy Simulation of a Turbulent Polydisperse Spray Flow: a Comparative Study of Subgrid Scale Models and Droplet Injection Models 湍流多分散喷雾流的大涡流模拟：亚网格尺度模型与液滴喷射模型的比较研究

Journal of Fluids Engineering Pub Date : 2024-02-14 DOI: 10.1115/1.4064760

Teng Zhang, Jinghua Li, Yingwen Yan, Yuxin Fan

{"title":"Large Eddy Simulation of a Turbulent Polydisperse Spray Flow: a Comparative Study of Subgrid Scale Models and Droplet Injection Models","authors":"Teng Zhang, Jinghua Li, Yingwen Yan, Yuxin Fan","doi":"10.1115/1.4064760","DOIUrl":"https://doi.org/10.1115/1.4064760","url":null,"abstract":"\u0000 This study performs an investigation of the effects of the subgrid-scale and droplet injection models in the large eddy simulation (LES) of turbulent two-phase spray flows. Three LES subgrid-scale (SGS) models (Smagorinsky, wall-adapting local eddy viscosity, and dynamic Smagorinsky) and two droplet injection models (cone nozzle injection and conditional droplet injection) are validated to the experimental measurements. For both gaseous and liquid phases, all SGS models provide comparable results, indicating that the current two-phase flow field does not exhibit a pronounced sensitivity to the LES SGS model. As for different droplet injection models and spray dispersion angles, minimal differences are observed in the prediction of the gaseous mean and RMS velocity profiles. However, for the result of liquid phase, CDIM (conditional droplet injection model) predictions of the droplet mean diameter and velocity are in better agreement with experiments, and less sensitive to spray dispersion angle settings. While the CNIM (cone nozzle injection model) prediction of droplet diameter is less accurate when increasing the dispersion angle. The study suggests that turbulent two-phase spray flows are more influenced by the spray boundary conditions rather than the LES SGS models.","PeriodicalId":504378,"journal":{"name":"Journal of Fluids Engineering","volume":"147 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139836569","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

Numerical Study of the Fluid Flow Over the Array of Rough Cylindrical Particles: An Analysis of Porous Media Flow 粗糙圆柱形颗粒阵列上的流体流动数值研究：多孔介质流分析

Journal of Fluids Engineering Pub Date : 2024-02-14 DOI: 10.1115/1.4064762

Pooja Thakur, Shruti Gautam, Aruna Thakur

引用次数: 0

Methodology for the Development of a Closed 2-Channel Impeller with Low Susceptibility to Clogging 低堵塞封闭式双通道叶轮的开发方法

Journal of Fluids Engineering Pub Date : 2024-02-14 DOI: 10.1115/1.4064761

David Beck, P. Thamsen

引用次数: 0

Methodology for the Development of a Closed 2-Channel Impeller with Low Susceptibility to Clogging 低堵塞封闭式双通道叶轮的开发方法

Journal of Fluids Engineering Pub Date : 2024-02-14 DOI: 10.1115/1.4064761

David Beck, P. Thamsen

引用次数: 0