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.
{"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}
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.
{"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}
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.
{"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}
S. Suryanarayanan, Anthony Settlemier, David Goldstein
Turbulent spots are regions of turbulence surrounded by laminar flow that appear during the late stages of boundary layer transition. While turbulent spots are often studied in isolation, they usually occur near low-speed streaks and other disturbances during transition. This paper investigates the interaction between a turbulent spot and a subcritical low-speed streak using direct numerical simulations. The results, analyzed from streak instability and vorticity points of view, reveal mechanisms of the destabilization of the streak by the spot and provide insights into spot evolution in a realistic environment. Additional simulations involving intentional local control of portions of the streak provide further insight into the interaction mechanisms and potential transition mitigation strategies.
{"title":"The Interaction of Turbulent Spots with Low-Speed Streaks","authors":"S. Suryanarayanan, Anthony Settlemier, David Goldstein","doi":"10.1115/1.4064852","DOIUrl":"https://doi.org/10.1115/1.4064852","url":null,"abstract":"\u0000 Turbulent spots are regions of turbulence surrounded by laminar flow that appear during the late stages of boundary layer transition. While turbulent spots are often studied in isolation, they usually occur near low-speed streaks and other disturbances during transition. This paper investigates the interaction between a turbulent spot and a subcritical low-speed streak using direct numerical simulations. The results, analyzed from streak instability and vorticity points of view, reveal mechanisms of the destabilization of the streak by the spot and provide insights into spot evolution in a realistic environment. Additional simulations involving intentional local control of portions of the streak provide further insight into the interaction mechanisms and potential transition mitigation strategies.","PeriodicalId":504378,"journal":{"name":"Journal of Fluids Engineering","volume":"74 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140421426","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}
Xincheng Wang, Mingtai Song, Huaiyu Cheng, Bin Ji, Linmin Li
To simulate the microscale bubble distribution and its effect on high-frequency cavitation noise, we present a two-way transition and coupling Euler–Lagrange model. The model accounts for both cavity fission and environmental nucleation as sources of microscale bubbles, which are limited in the traditional mesh-based Euler models. We evaluate the model with the experimental data of truncated NACA0009 hydrofoil as well as the measured bubble size distributions, showing satisfactory results for velocity distribution, cavity patterns, and power law scalings of bubble size. Based on an acoustic analogy, we find that the model produces sound waves with smaller wavelengths and higher frequencies than the Euler model, which are mainly attributed to two factors: (1) microscale bubbles with high natural frequency and (2) intense multiple cavity collapse/rebound behavior. This model is promising for predicting the full-spectrum of cavitation noise.
{"title":"A Multiscale Euler–Lagrange Model for High-Frequency Cavitation Noise Prediction","authors":"Xincheng Wang, Mingtai Song, Huaiyu Cheng, Bin Ji, Linmin Li","doi":"10.1115/1.4064296","DOIUrl":"https://doi.org/10.1115/1.4064296","url":null,"abstract":"\u0000 To simulate the microscale bubble distribution and its effect on high-frequency cavitation noise, we present a two-way transition and coupling Euler–Lagrange model. The model accounts for both cavity fission and environmental nucleation as sources of microscale bubbles, which are limited in the traditional mesh-based Euler models. We evaluate the model with the experimental data of truncated NACA0009 hydrofoil as well as the measured bubble size distributions, showing satisfactory results for velocity distribution, cavity patterns, and power law scalings of bubble size. Based on an acoustic analogy, we find that the model produces sound waves with smaller wavelengths and higher frequencies than the Euler model, which are mainly attributed to two factors: (1) microscale bubbles with high natural frequency and (2) intense multiple cavity collapse/rebound behavior. This model is promising for predicting the full-spectrum of cavitation noise.","PeriodicalId":504378,"journal":{"name":"Journal of Fluids Engineering","volume":"23 24","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140442069","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}
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.
本研究调查了子网格尺度模型和液滴喷射模型在湍流两相喷雾流大涡模拟（LES）中的影响。三种 LES 子网格尺度（SGS）模型（斯马戈林斯基模型、壁面适应局部涡流粘度模型和动态斯马戈林斯基模型）和两种液滴喷射模型（锥形喷嘴喷射模型和条件液滴喷射模型）根据实验测量结果进行了验证。对于气相和液相，所有 SGS 模型都提供了可比较的结果，表明当前的两相流场对 LES SGS 模型并不表现出明显的敏感性。对于不同的液滴喷射模型和喷射分散角，气相平均速度和均方根速度曲线的预测结果差异很小。然而，对于液相的结果，CDIM（条件液滴喷射模型）对液滴平均直径和速度的预测与实验的吻合度较高，对喷雾分散角设置的敏感度较低。而 CNIM（锥形喷嘴喷射模型）对液滴直径的预测在增大分散角时准确性较低。研究表明，湍流两相喷雾流受喷雾边界条件的影响比 LES SGS 模型更大。
{"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}
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.
本研究调查了子网格尺度模型和液滴喷射模型在湍流两相喷雾流大涡模拟（LES）中的影响。三种 LES 子网格尺度（SGS）模型（斯马戈林斯基模型、壁面适应局部涡流粘度模型和动态斯马戈林斯基模型）和两种液滴喷射模型（锥形喷嘴喷射模型和条件液滴喷射模型）根据实验测量结果进行了验证。对于气相和液相，所有 SGS 模型都提供了可比较的结果，表明当前的两相流场对 LES SGS 模型并不表现出明显的敏感性。对于不同的液滴喷射模型和喷射分散角，气相平均速度和均方根速度曲线的预测结果差异很小。然而，对于液相的结果，CDIM（条件液滴喷射模型）对液滴平均直径和速度的预测与实验的吻合度较高，对喷雾分散角设置的敏感度较低。而 CNIM（锥形喷嘴喷射模型）对液滴直径的预测在增大分散角时准确性较低。研究表明，湍流两相喷雾流受喷雾边界条件的影响比 LES SGS 模型更大。
{"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}
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.
{"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":"128 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139837340","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}
Wastewater pumps are increasingly clogged by solids containing fibers. Closed 2-channel impellers in particular are often highly susceptible to clogging due to their geometric properties, even though they have among the highest clear water efficiencies compared to other wastewater impellers. With the help of a clogging test rig, a prototype that can accommodate different closed 2-channel geometries, the use of 3D-simulation as well as an optical access for high-speed recordings, a methodology is to be created, whereby this impeller type can be effectively optimized. In this paper, the first impeller modification is calculated, manufactured, simulated and tested with this methodology.
{"title":"Methodology for the Development of a Closed 2-Channel Impeller with Low Susceptibility to Clogging","authors":"David Beck, P. Thamsen","doi":"10.1115/1.4064761","DOIUrl":"https://doi.org/10.1115/1.4064761","url":null,"abstract":"\u0000 Wastewater pumps are increasingly clogged by solids containing fibers. Closed 2-channel impellers in particular are often highly susceptible to clogging due to their geometric properties, even though they have among the highest clear water efficiencies compared to other wastewater impellers. With the help of a clogging test rig, a prototype that can accommodate different closed 2-channel geometries, the use of 3D-simulation as well as an optical access for high-speed recordings, a methodology is to be created, whereby this impeller type can be effectively optimized. In this paper, the first impeller modification is calculated, manufactured, simulated and tested with this methodology.","PeriodicalId":504378,"journal":{"name":"Journal of Fluids Engineering","volume":"43 24","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139778333","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}
Wastewater pumps are increasingly clogged by solids containing fibers. Closed 2-channel impellers in particular are often highly susceptible to clogging due to their geometric properties, even though they have among the highest clear water efficiencies compared to other wastewater impellers. With the help of a clogging test rig, a prototype that can accommodate different closed 2-channel geometries, the use of 3D-simulation as well as an optical access for high-speed recordings, a methodology is to be created, whereby this impeller type can be effectively optimized. In this paper, the first impeller modification is calculated, manufactured, simulated and tested with this methodology.
{"title":"Methodology for the Development of a Closed 2-Channel Impeller with Low Susceptibility to Clogging","authors":"David Beck, P. Thamsen","doi":"10.1115/1.4064761","DOIUrl":"https://doi.org/10.1115/1.4064761","url":null,"abstract":"\u0000 Wastewater pumps are increasingly clogged by solids containing fibers. Closed 2-channel impellers in particular are often highly susceptible to clogging due to their geometric properties, even though they have among the highest clear water efficiencies compared to other wastewater impellers. With the help of a clogging test rig, a prototype that can accommodate different closed 2-channel geometries, the use of 3D-simulation as well as an optical access for high-speed recordings, a methodology is to be created, whereby this impeller type can be effectively optimized. In this paper, the first impeller modification is calculated, manufactured, simulated and tested with this methodology.","PeriodicalId":504378,"journal":{"name":"Journal of Fluids Engineering","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139838251","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}
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