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Flow Instabilities and Control Mechanisms in Cylindrical Cavities with Top Bounding Walls 带顶壁圆柱形空腔中的流动不稳定性和控制机制
Journal of Fluids Engineering Pub Date : 2024-02-14 DOI: 10.1115/1.4064759
Aarthi Sekaran
{"title":"Flow Instabilities and Control Mechanisms in Cylindrical Cavities with Top Bounding Walls","authors":"Aarthi Sekaran","doi":"10.1115/1.4064759","DOIUrl":"https://doi.org/10.1115/1.4064759","url":null,"abstract":"\u0000 Cavity flows studied over the past few decades have led to an increased understanding of the flow physics and instability modes in a range of configurations. While a large number of these studies focus on two-dimensional and three-dimensional rectangular cavities, significant variations are seen with three-dimensional cylindrical cavities with a top bounding wall. The present work details the flow physics of such cavities with a compressible (air) flow past the cavity at two pressure drops of 3850 Pa and 2000 Pa. Results from Detached Eddy Simulations (DES) reveal the presence of the wake mode and shear layer instabilities respectively, with modified dynamics and oscillatory modes owing to the top wall. In the interest of preventing mode switching with changes in operating conditions, which could lead to large-scale flow disruptions, a passive flow control technique is tested. The modified cavity (with a downstream ramp scaled by the size of shed structures) is seen to maintain the same mode throughout the range of operation offering valuable insights into design modifications for such cavities in practical settings.","PeriodicalId":504378,"journal":{"name":"Journal of Fluids Engineering","volume":"478 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139839093","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 Instabilities and Control Mechanisms in Cylindrical Cavities with Top Bounding Walls 带顶壁圆柱形空腔中的流动不稳定性和控制机制
Journal of Fluids Engineering Pub Date : 2024-02-14 DOI: 10.1115/1.4064759
Aarthi Sekaran
{"title":"Flow Instabilities and Control Mechanisms in Cylindrical Cavities with Top Bounding Walls","authors":"Aarthi Sekaran","doi":"10.1115/1.4064759","DOIUrl":"https://doi.org/10.1115/1.4064759","url":null,"abstract":"\u0000 Cavity flows studied over the past few decades have led to an increased understanding of the flow physics and instability modes in a range of configurations. While a large number of these studies focus on two-dimensional and three-dimensional rectangular cavities, significant variations are seen with three-dimensional cylindrical cavities with a top bounding wall. The present work details the flow physics of such cavities with a compressible (air) flow past the cavity at two pressure drops of 3850 Pa and 2000 Pa. Results from Detached Eddy Simulations (DES) reveal the presence of the wake mode and shear layer instabilities respectively, with modified dynamics and oscillatory modes owing to the top wall. In the interest of preventing mode switching with changes in operating conditions, which could lead to large-scale flow disruptions, a passive flow control technique is tested. The modified cavity (with a downstream ramp scaled by the size of shed structures) is seen to maintain the same mode throughout the range of operation offering valuable insights into design modifications for such cavities in practical settings.","PeriodicalId":504378,"journal":{"name":"Journal of Fluids Engineering","volume":"84 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139779420","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
{"title":"Numerical Study of the Fluid Flow Over the Array of Rough Cylindrical Particles: An Analysis of Porous Media Flow","authors":"Pooja Thakur, Shruti Gautam, Aruna Thakur","doi":"10.1115/1.4064762","DOIUrl":"https://doi.org/10.1115/1.4064762","url":null,"abstract":"\u0000 The objective of the study is to thoroughly analyze the flow and heat transfer of Bingham plastic fluids through an array of uniformly gapped rough surface cylinders embedded between two confined boundaries. Radial notches are used as the surface roughness in the model, evenly distributed. Due to the formation of front vortices in uniformly gapped cylinders, a negative pressure gradient is developed. The results of the numerical simulation analysis have shown that, when compared to the averaged Nusselt number, roughness has a minimal effect on the drag coefficient and pressure drop. As the degree of roughness increases, the size of the vortices decreases, resulting in a drop in heat transfer. Moreover, the analysis of each column shows that the first column array of cylinders has a higher total drag coefficient and average Nusselt number.","PeriodicalId":504378,"journal":{"name":"Journal of Fluids Engineering","volume":"50 22","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139777355","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
Dual-Orthogonal-Plane Particle Image Velocimetry Measurement of the Turbulent Flow in the Channel Head of a Large-Scale Steam Generator Mock-Up 大型蒸汽发生器模型通道头部湍流的双正交平面粒子图像测速仪测量结果
Journal of Fluids Engineering Pub Date : 2024-02-12 DOI: 10.1115/1.4064754
Sen Li, Juan Liao, Chuangxin He, Chunjing Song, Yingzheng Liu, Yun Zhong
{"title":"Dual-Orthogonal-Plane Particle Image Velocimetry Measurement of the Turbulent Flow in the Channel Head of a Large-Scale Steam Generator Mock-Up","authors":"Sen Li, Juan Liao, Chuangxin He, Chunjing Song, Yingzheng Liu, Yun Zhong","doi":"10.1115/1.4064754","DOIUrl":"https://doi.org/10.1115/1.4064754","url":null,"abstract":"\u0000 In this work, a large-scale mock-up of a compact complex system integrating a steam generator (SG) and a reactor coolant pump (RCP) is considered. The three-dimensional turbulent flow in the steam generator channel head (SGCH) is measured in detail. Dual-orthogonal-plane particle image velocimetry (PIV) is employed to extract high-resolution flow information in two orthogonal planes. Two separate measurements are first made to see the three-dimensional time-mean flow dynamics and the statistical quantities in the two planes. These measurements highlight two distinct flow phenomena: jet arrays and massive turbulent separation bubbles (TSBs). These patterns are attributed to mass flow redistribution in the U-shaped tubes. Proper orthogonal decomposition (POD) identifies the first POD mode as corresponding to the TSB breathing-like motion, which significantly intensifies the side view streamwise velocity fluctuations, leading to them reaching 370% of the local mean velocity. To examine the unsteady behavior of massively separated regions, the dual-orthogonal-plane PIV system is then synchronized to simultaneously measure variations in the flow fields, and the missing data due to illumination interference is reconstructed using gappy POD. The synchronized analysis reveals a direct relationship between the low-frequency fluctuations in the side and front views. These fluctuations are in phase across both views, indicating a synchronized behavior that spans the entire field. This large-scale low-frequency breathing motion has critical implications for numerical simulations and sheds light on the unsteady behavior of the RCP system within the SGCH.","PeriodicalId":504378,"journal":{"name":"Journal of Fluids Engineering","volume":"24 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139784967","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
Design of a Simple Valveless Micropump Using Piezoelectric Actuators 利用压电致动器设计简单的无阀微型泵
Journal of Fluids Engineering Pub Date : 2024-02-12 DOI: 10.1115/1.4064755
Tai-Ho Yu, Chun-Hung Lai, Yuan-Hsin Chen
{"title":"Design of a Simple Valveless Micropump Using Piezoelectric Actuators","authors":"Tai-Ho Yu, Chun-Hung Lai, Yuan-Hsin Chen","doi":"10.1115/1.4064755","DOIUrl":"https://doi.org/10.1115/1.4064755","url":null,"abstract":"\u0000 An open valveless micropump pumped by a disc-shaped piezoelectric actuator was developed, and its working principles were investigated. The electrode of the pump buzzer was divided into two semicircles as piezoelectric actuators, and single-phase or dual-phase AC driving potential was applied. The flow rate of the pump was analyzed when actuated in basic symmetric (W00) and anti-symmetric (W01) modes. The finite element package software ANSYS was used to analyze the resonant frequency and mode of the buzzer under fluid loading, and the vibration displacement generated by the single-phase and dual-phase time-harmonic actuation was both simulated by using an additional mass method and experimentally investigated. The experimental results show that the resonant frequency of the disc-shaped actuator decreased due to the fluid loading effect and as the gap distance between the conduit and the actuator decreased. The maximum flow rates of the W00 and W01 mode actuated pumps were 133.13 and 9.63 mL/min, respectively. The driving frequency with the highest pump efficiency was slightly lower than the resonance frequency of the fluid-loaded buzzer. Applying a hydrophobic treatment to the back of the buzzer decreased the resonance frequency under fluid loading. The results show that simulating the structural resonance frequency for various fluid loads by the additional mass method is feasible. The flow direction could be controlled by activating the W01 mode.","PeriodicalId":504378,"journal":{"name":"Journal of Fluids Engineering","volume":"78 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139783559","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
Investigation of the Influence of Flow Pattern On the Internal Corrosion in Horizontal-Vertical Downward Pipe with Oil-Water Flow 流动模式对油水流动水平垂直向下管道内部腐蚀的影响研究
Journal of Fluids Engineering Pub Date : 2024-02-12 DOI: 10.1115/1.4064756
Yan Li, Guoqing Su, Qianlin Wang, Zhansheng Tao, Jianwen Zhang
{"title":"Investigation of the Influence of Flow Pattern On the Internal Corrosion in Horizontal-Vertical Downward Pipe with Oil-Water Flow","authors":"Yan Li, Guoqing Su, Qianlin Wang, Zhansheng Tao, Jianwen Zhang","doi":"10.1115/1.4064756","DOIUrl":"https://doi.org/10.1115/1.4064756","url":null,"abstract":"\u0000 In the petroleum and petrochemical industries, oil-water flow is widespread inside the pipes. The existence of water often results in internal corrosion in the horizontal-vertical downward pipe when water contacts the pipe wall. Surface wetting behavior and wall shear stress are two important factors affecting corrosion procedure, which are governed by the flow patterns. With the propose to mitigate corrosion, focus shall be concentrated on the impact of flow pattern towards corrosion. In this work, the flow regime with oil-water flow in the horizontal-vertical pipe are investigated by computational fluid dynamics simulations. The cases with different mixture velocity (0.1m/s-2.2m/s) and different water cut (3%-40%) are investigated. The key discovery in this paper is that five types of flow patterns can be identified based on the multiphase flow in the horizontal-vertical pipe, which is rarely reported in recent work. According to the results of the surface wetting status and wall shear stress distribution, the severe corrosion area is predicted and classified into five types. The inside wall of elbows and the outside wall of vertical pipes are the areas most susceptible to corrosion, and the results are well in line with the on-site data.","PeriodicalId":504378,"journal":{"name":"Journal of Fluids Engineering","volume":"36 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139784832","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
Bioinspired Fluid Dynamic Designs of Vertical-Axis Turbines: State-of-the-Art Review and the Way Forward 立轴涡轮机的生物流体动力学设计：最新技术回顾与前进方向
Journal of Fluids Engineering Pub Date : 2024-02-12 DOI: 10.1115/1.4064753
Umang H. Rathod, U. Saha, V. Kulkarni
{"title":"Bioinspired Fluid Dynamic Designs of Vertical-Axis Turbines: State-of-the-Art Review and the Way Forward","authors":"Umang H. Rathod, U. Saha, V. Kulkarni","doi":"10.1115/1.4064753","DOIUrl":"https://doi.org/10.1115/1.4064753","url":null,"abstract":"\u0000 With the increasing popularity of vertical axis turbines (VATs), researchers are now focussing on their performance improvement. Instead of adopting conventional means of performance improvements such as augmentation techniques and exhaustive parametric design optimization, the bioinspired turbine designs have become a centre of attraction, especially during the last decade. This review article attempts to compile the bioinspired designs belonging to the VATs. Bioinspired designs implemented in Savonius and Darrieus turbines are elaborated besides giving a detailed explanation of the corresponding bio-organism and natural phenomenon. How are the working principles of bio-organisms emulated in the form of fluid dynamic design is explained thoroughly in this paper. The bioinspired designs for VATs are classified pragmatically for the future designs. Research gaps are highlighted for the aspiring researchers, and this is followed by the important strategies and allied challenges.","PeriodicalId":504378,"journal":{"name":"Journal of Fluids Engineering","volume":"61 15","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139844467","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
Investigation of the Influence of Flow Pattern On the Internal Corrosion in Horizontal-Vertical Downward Pipe with Oil-Water Flow 流动模式对油水流动水平垂直向下管道内部腐蚀的影响研究
Journal of Fluids Engineering Pub Date : 2024-02-12 DOI: 10.1115/1.4064756
Yan Li, Guoqing Su, Qianlin Wang, Zhansheng Tao, Jianwen Zhang
{"title":"Investigation of the Influence of Flow Pattern On the Internal Corrosion in Horizontal-Vertical Downward Pipe with Oil-Water Flow","authors":"Yan Li, Guoqing Su, Qianlin Wang, Zhansheng Tao, Jianwen Zhang","doi":"10.1115/1.4064756","DOIUrl":"https://doi.org/10.1115/1.4064756","url":null,"abstract":"\u0000 In the petroleum and petrochemical industries, oil-water flow is widespread inside the pipes. The existence of water often results in internal corrosion in the horizontal-vertical downward pipe when water contacts the pipe wall. Surface wetting behavior and wall shear stress are two important factors affecting corrosion procedure, which are governed by the flow patterns. With the propose to mitigate corrosion, focus shall be concentrated on the impact of flow pattern towards corrosion. In this work, the flow regime with oil-water flow in the horizontal-vertical pipe are investigated by computational fluid dynamics simulations. The cases with different mixture velocity (0.1m/s-2.2m/s) and different water cut (3%-40%) are investigated. The key discovery in this paper is that five types of flow patterns can be identified based on the multiphase flow in the horizontal-vertical pipe, which is rarely reported in recent work. According to the results of the surface wetting status and wall shear stress distribution, the severe corrosion area is predicted and classified into five types. The inside wall of elbows and the outside wall of vertical pipes are the areas most susceptible to corrosion, and the results are well in line with the on-site data.","PeriodicalId":504378,"journal":{"name":"Journal of Fluids Engineering","volume":"57 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139844685","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
Design of a Simple Valveless Micropump Using Piezoelectric Actuators 利用压电致动器设计简单的无阀微型泵
Journal of Fluids Engineering Pub Date : 2024-02-12 DOI: 10.1115/1.4064755
Tai-Ho Yu, Chun-Hung Lai, Yuan-Hsin Chen
{"title":"Design of a Simple Valveless Micropump Using Piezoelectric Actuators","authors":"Tai-Ho Yu, Chun-Hung Lai, Yuan-Hsin Chen","doi":"10.1115/1.4064755","DOIUrl":"https://doi.org/10.1115/1.4064755","url":null,"abstract":"\u0000 An open valveless micropump pumped by a disc-shaped piezoelectric actuator was developed, and its working principles were investigated. The electrode of the pump buzzer was divided into two semicircles as piezoelectric actuators, and single-phase or dual-phase AC driving potential was applied. The flow rate of the pump was analyzed when actuated in basic symmetric (W00) and anti-symmetric (W01) modes. The finite element package software ANSYS was used to analyze the resonant frequency and mode of the buzzer under fluid loading, and the vibration displacement generated by the single-phase and dual-phase time-harmonic actuation was both simulated by using an additional mass method and experimentally investigated. The experimental results show that the resonant frequency of the disc-shaped actuator decreased due to the fluid loading effect and as the gap distance between the conduit and the actuator decreased. The maximum flow rates of the W00 and W01 mode actuated pumps were 133.13 and 9.63 mL/min, respectively. The driving frequency with the highest pump efficiency was slightly lower than the resonance frequency of the fluid-loaded buzzer. Applying a hydrophobic treatment to the back of the buzzer decreased the resonance frequency under fluid loading. The results show that simulating the structural resonance frequency for various fluid loads by the additional mass method is feasible. The flow direction could be controlled by activating the W01 mode.","PeriodicalId":504378,"journal":{"name":"Journal of Fluids Engineering","volume":"66 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139843605","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
Bioinspired Fluid Dynamic Designs of Vertical-Axis Turbines: State-of-the-Art Review and the Way Forward 立轴涡轮机的生物流体动力学设计：最新技术回顾与前进方向
Journal of Fluids Engineering Pub Date : 2024-02-12 DOI: 10.1115/1.4064753
Umang H. Rathod, U. Saha, V. Kulkarni
{"title":"Bioinspired Fluid Dynamic Designs of Vertical-Axis Turbines: State-of-the-Art Review and the Way Forward","authors":"Umang H. Rathod, U. Saha, V. Kulkarni","doi":"10.1115/1.4064753","DOIUrl":"https://doi.org/10.1115/1.4064753","url":null,"abstract":"\u0000 With the increasing popularity of vertical axis turbines (VATs), researchers are now focussing on their performance improvement. Instead of adopting conventional means of performance improvements such as augmentation techniques and exhaustive parametric design optimization, the bioinspired turbine designs have become a centre of attraction, especially during the last decade. This review article attempts to compile the bioinspired designs belonging to the VATs. Bioinspired designs implemented in Savonius and Darrieus turbines are elaborated besides giving a detailed explanation of the corresponding bio-organism and natural phenomenon. How are the working principles of bio-organisms emulated in the form of fluid dynamic design is explained thoroughly in this paper. The bioinspired designs for VATs are classified pragmatically for the future designs. Research gaps are highlighted for the aspiring researchers, and this is followed by the important strategies and allied challenges.","PeriodicalId":504378,"journal":{"name":"Journal of Fluids Engineering","volume":"70 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139784796","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
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