- Auxetic structures are characterised by a negative Poisson’s ratio. There are a variety of auxetic structures out of which the relevant ones are highlighted. After a simulative comparison of the thermal and mechanical properties, the most suitable structure and topology is selected for the application in turbomachinery. A parameter variation of this topology leads to an analytical model that describes the mechanical behaviour of the recursive lattice structure as a function of these geometric sizes: the recursive angle 𝛩 , the aspect ratio 𝛼 , the normalised wall thickness 𝛽 , the normalised radius 𝜅 and the cell density 𝑛 . Regarding the thermal properties, the so-called resistance length 𝑅 L is introduced, which allows a good prediction of the thermal behaviour depending on the cell dimensions. Finally, potential fields of application in the literature are outlined. not able to fully display the interrelationships between the factors and the geometry behaviour. A meta-model has to be generated to broadly understand the structure and effects of the different parameters.
{"title":"An Auxetic Construction Kit for Turbomachinery Application","authors":"Stefan Schröter, Lukas Reisinger, V. Gümmer","doi":"10.11159/icmie22.104","DOIUrl":"https://doi.org/10.11159/icmie22.104","url":null,"abstract":"- Auxetic structures are characterised by a negative Poisson’s ratio. There are a variety of auxetic structures out of which the relevant ones are highlighted. After a simulative comparison of the thermal and mechanical properties, the most suitable structure and topology is selected for the application in turbomachinery. A parameter variation of this topology leads to an analytical model that describes the mechanical behaviour of the recursive lattice structure as a function of these geometric sizes: the recursive angle 𝛩 , the aspect ratio 𝛼 , the normalised wall thickness 𝛽 , the normalised radius 𝜅 and the cell density 𝑛 . Regarding the thermal properties, the so-called resistance length 𝑅 L is introduced, which allows a good prediction of the thermal behaviour depending on the cell dimensions. Finally, potential fields of application in the literature are outlined. not able to fully display the interrelationships between the factors and the geometry behaviour. A meta-model has to be generated to broadly understand the structure and effects of the different parameters.","PeriodicalId":385356,"journal":{"name":"Proceedings of the 8th World Congress on Mechanical, Chemical, and Material Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134213360","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}
{"title":"Preparation of Metallographic Specimen of Copper and Bronze","authors":"Tanja Ž. Antić, M. Leban, T. Kosec","doi":"10.11159/mmme22.112","DOIUrl":"https://doi.org/10.11159/mmme22.112","url":null,"abstract":"","PeriodicalId":385356,"journal":{"name":"Proceedings of the 8th World Congress on Mechanical, Chemical, and Material Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130917614","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 was conducted to develop a flat plate, calorimetric based, mass airflow sensor capable of measuring low-speed flow typically found in heating, ventilation, and air conditioning (HVAC) systems. Moreover, to develop a numerical model that accurately predicts the fluidic and thermal behaviour of the sensor design. Current findings indicate that the numerical and experimental results were in close agreement, with the predicted leading-edge temperatures within 1-2% of those recorded experimentally. However, this error increased in the trailing edge to a maximum of 8%; inclusion of the trailing edge flap within the numerical model reduced this to less than 3%, suggesting that the flap generates enhanced cooling within the trailing region. The temperature deltas predicted by the numerical model were on average twice that of the experimental values, however, the average temperature change was still less than 0.03°C per 1 m/s increase in velocity. It was concluded that the copper sensor design was unsuitable for mass flow measurement. The numerical findings for the stainless-steel sensor indicate a 600% increase in the maximum temperature delta measured from 0.069°C to 0.49°C. Which suggests the subsequent increase in accuracy is a result of the decreased thermal diffusivity of stainless-steel, which is 96% lower than that of copper. Other findings include, a further increase in temperature delta values when the heater size is decreased, resulting in a maximum temperature delta value of 0.58°C and an average change of 0.49°C for a 1 m/s change in flow velocity. Thus, it can be implied that the modified calorimetric airflow sensor would accurately predict the mass flow rates within HVAC ducting systems.
{"title":"Development of a Thermal Mass Airflow Sensor for Low Velocity Ducted Flow Applications","authors":"E. Eoin, Conor Macken, V. Egan","doi":"10.11159/htff22.165","DOIUrl":"https://doi.org/10.11159/htff22.165","url":null,"abstract":"- This study was conducted to develop a flat plate, calorimetric based, mass airflow sensor capable of measuring low-speed flow typically found in heating, ventilation, and air conditioning (HVAC) systems. Moreover, to develop a numerical model that accurately predicts the fluidic and thermal behaviour of the sensor design. Current findings indicate that the numerical and experimental results were in close agreement, with the predicted leading-edge temperatures within 1-2% of those recorded experimentally. However, this error increased in the trailing edge to a maximum of 8%; inclusion of the trailing edge flap within the numerical model reduced this to less than 3%, suggesting that the flap generates enhanced cooling within the trailing region. The temperature deltas predicted by the numerical model were on average twice that of the experimental values, however, the average temperature change was still less than 0.03°C per 1 m/s increase in velocity. It was concluded that the copper sensor design was unsuitable for mass flow measurement. The numerical findings for the stainless-steel sensor indicate a 600% increase in the maximum temperature delta measured from 0.069°C to 0.49°C. Which suggests the subsequent increase in accuracy is a result of the decreased thermal diffusivity of stainless-steel, which is 96% lower than that of copper. Other findings include, a further increase in temperature delta values when the heater size is decreased, resulting in a maximum temperature delta value of 0.58°C and an average change of 0.49°C for a 1 m/s change in flow velocity. Thus, it can be implied that the modified calorimetric airflow sensor would accurately predict the mass flow rates within HVAC ducting systems.","PeriodicalId":385356,"journal":{"name":"Proceedings of the 8th World Congress on Mechanical, Chemical, and Material Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133330435","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}
Karolina Kosowska, P. Koziol, D. Liberda, T. Wróbel
Extended Abstract Fourier transform infrared microspectroscopy (FT-IR) is a nondestructive, information-rich, and label-free technique successfully applied for years in material science. The introduction of linear polarization enriches the technique with the possibility of studying the orientation of macromolecules. Until now, experiments focused on using the absorbance of a single band to retrieve the in-plane orientation and the degree of order. The extended four-polarization (4P) method, which enables the visualization of the macromolecule orientation regardless of the choice of the direction of polarization, was proposed by Hikima et al. for polymers [1]. The application of IR imaging with 4P on heterogeneous structure, human tissue microarrays, was presented for the first time by our team in 2020 [2], [3]. A deeper characterization of the sample structure is the next step. Simultaneous analysis of two bands of roughly perpendicular transition moment orientations was proposed by Lee in 2018 as a method of determining the orientation of the molecule in three-dimensional space [4]. The first application of “concurrent analysis” (4P-3D) to
{"title":"Imaging of Three-dimensional Orientation of Molecules in Polymers Using FT-IR, Raman, and O-PTIR Microspectroscopies","authors":"Karolina Kosowska, P. Koziol, D. Liberda, T. Wróbel","doi":"10.11159/iccpe22.118","DOIUrl":"https://doi.org/10.11159/iccpe22.118","url":null,"abstract":"Extended Abstract Fourier transform infrared microspectroscopy (FT-IR) is a nondestructive, information-rich, and label-free technique successfully applied for years in material science. The introduction of linear polarization enriches the technique with the possibility of studying the orientation of macromolecules. Until now, experiments focused on using the absorbance of a single band to retrieve the in-plane orientation and the degree of order. The extended four-polarization (4P) method, which enables the visualization of the macromolecule orientation regardless of the choice of the direction of polarization, was proposed by Hikima et al. for polymers [1]. The application of IR imaging with 4P on heterogeneous structure, human tissue microarrays, was presented for the first time by our team in 2020 [2], [3]. A deeper characterization of the sample structure is the next step. Simultaneous analysis of two bands of roughly perpendicular transition moment orientations was proposed by Lee in 2018 as a method of determining the orientation of the molecule in three-dimensional space [4]. The first application of “concurrent analysis” (4P-3D) to","PeriodicalId":385356,"journal":{"name":"Proceedings of the 8th World Congress on Mechanical, Chemical, and Material Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126582455","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}
W. Rakpakdee, Teerapat Thungthong, W. Chaiworapuek, Kanet Katchasuwanmanee, S. Kreuawan, V. T. Tuan
- In this paper, air-cooling models are investigated numerically on a new design of metal fin heat sinks based on the motor of the motorcycle using the Computational Fluid Dynamics (CFD) package ANSYS Fluent. The standard k - ε turbulence model was used in the numerical simulation. The domain was a rectangular geometry, and the metal fins created in the numerical model had three types: square pin, circle short pin, and circle long pin. These metal fin models were heated by a heat source at a power of 150-200 W based on the working range of the motorcycle’s motor. Also, the air velocity for cooling was in the range of 40-60 km/h based on the motorcycle’s speed. The temperature contours of the three models were used to compare the heat dissipation. The results showed that the thermal resistance did not change significantly when the heat source was changed. Notably, the circle long pin had the best effectiveness in dissipating heat compared to the others. The results from this research were important information that will help design and develop the heat sinks of the motor in the future.
{"title":"Comparison of Air-Cooling on Metal Heat Sinks Using Numerical Modelling","authors":"W. Rakpakdee, Teerapat Thungthong, W. Chaiworapuek, Kanet Katchasuwanmanee, S. Kreuawan, V. T. Tuan","doi":"10.11159/htff22.158","DOIUrl":"https://doi.org/10.11159/htff22.158","url":null,"abstract":"- In this paper, air-cooling models are investigated numerically on a new design of metal fin heat sinks based on the motor of the motorcycle using the Computational Fluid Dynamics (CFD) package ANSYS Fluent. The standard k - ε turbulence model was used in the numerical simulation. The domain was a rectangular geometry, and the metal fins created in the numerical model had three types: square pin, circle short pin, and circle long pin. These metal fin models were heated by a heat source at a power of 150-200 W based on the working range of the motorcycle’s motor. Also, the air velocity for cooling was in the range of 40-60 km/h based on the motorcycle’s speed. The temperature contours of the three models were used to compare the heat dissipation. The results showed that the thermal resistance did not change significantly when the heat source was changed. Notably, the circle long pin had the best effectiveness in dissipating heat compared to the others. The results from this research were important information that will help design and develop the heat sinks of the motor in the future.","PeriodicalId":385356,"journal":{"name":"Proceedings of the 8th World Congress on Mechanical, Chemical, and Material Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128912870","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}
R. Cerqueira, R. Perissinotto, W. Fonseca, W. M. Verde, Biazussi J. L., Franklin E.J. L., M. Castro, A. Bannwart
- The current work presents a framework for the simultaneous characterization of different phases in a dispersed oil-water two-phase flow. The framework is based on the coupling of the PIV and PTV techniques in raw PIV acquisition images. The PIV technique computes the water velocity fields, while the PTV technique calculates the oil drop velocities. Thus, the proposed technique allows the simultaneous measurement of the water phase and dispersed oil drop velocity from the same image. In order to present the advantages of the coupled PIV/PTV technique, the flow within a centrifugal pump impeller is completely analyzed by computing the oil and water phase-ensembled velocities. the phase-averaged velocity fields of the oil drops are presented. The results show that the oil drops move slower than the continuous phase on the majority of the impeller channels, except close to the oil injection ports. These results may help the oil drop dynamics within centrifugal pump impellers, the of drag/lift/virtual mass closure models, typically used in Computational Fluid Dynamics (CFD) applications.
{"title":"A Coupled PIV PTV Technique for the Dispersed Oil-Water Two-Phase\u0000Flows Within a Centrifugal Pump Impeller","authors":"R. Cerqueira, R. Perissinotto, W. Fonseca, W. M. Verde, Biazussi J. L., Franklin E.J. L., M. Castro, A. Bannwart","doi":"10.11159/htff22.186","DOIUrl":"https://doi.org/10.11159/htff22.186","url":null,"abstract":"- The current work presents a framework for the simultaneous characterization of different phases in a dispersed oil-water two-phase flow. The framework is based on the coupling of the PIV and PTV techniques in raw PIV acquisition images. The PIV technique computes the water velocity fields, while the PTV technique calculates the oil drop velocities. Thus, the proposed technique allows the simultaneous measurement of the water phase and dispersed oil drop velocity from the same image. In order to present the advantages of the coupled PIV/PTV technique, the flow within a centrifugal pump impeller is completely analyzed by computing the oil and water phase-ensembled velocities. the phase-averaged velocity fields of the oil drops are presented. The results show that the oil drops move slower than the continuous phase on the majority of the impeller channels, except close to the oil injection ports. These results may help the oil drop dynamics within centrifugal pump impellers, the of drag/lift/virtual mass closure models, typically used in Computational Fluid Dynamics (CFD) applications.","PeriodicalId":385356,"journal":{"name":"Proceedings of the 8th World Congress on Mechanical, Chemical, and Material Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114419971","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}
{"title":"A Study on Traveling-Wave Motor for Miniature Particles Delivery","authors":"Yun Ting, Chih-Hsuan Yu, S. Abbas","doi":"10.11159/icmie22.113","DOIUrl":"https://doi.org/10.11159/icmie22.113","url":null,"abstract":"","PeriodicalId":385356,"journal":{"name":"Proceedings of the 8th World Congress on Mechanical, Chemical, and Material Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114923115","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}
- Lighting fixtures are finding a wide range of applications in Roadways, Sports lighting, Architectural lighting, Industries, etc. Lumen requirement for these applications is constantly increasing thereby augmenting the power needed and consequently the heat generation. To suffice these needs, high power density luminaries with lumens output in several thousand are used. Hitherto, thermal management of these luminaires was achieved through passive cooling with the help of heatsinks attached at the back of LEDs. Heatsinks utilized for this high-power density fixtures are relatively large to provide a higher surface area for heat transfer. With the larger heatsinks in the lighting system, the cost associated with packaging, mounting, manufacturing increases significantly. In addition, weight and EPA of these fixtures increases as well which has a negative impact on retrofit applications where existing infrastructure is designed for lighter weight products and replacing with higher weight and EPA product is not an optimal solution. To address these concerns, the present study focuses on utilizing an active cooling method with multiple fans placed in parallel to reduce the system size and weight. Several parameters such as fan speed, number of fins, fin height, input power, are varied to evaluate LED temperatures. Comparison is made with various design configurations and optimized design obtained through analysis is used for the final product development. Overall reduction in the weight and cost associated is then discussed in details in the summary.
{"title":"Impact of Active Cooling On High Power Density Fixtures","authors":"P. Joshi, Khurram Moghal","doi":"10.11159/htff22.142","DOIUrl":"https://doi.org/10.11159/htff22.142","url":null,"abstract":"- Lighting fixtures are finding a wide range of applications in Roadways, Sports lighting, Architectural lighting, Industries, etc. Lumen requirement for these applications is constantly increasing thereby augmenting the power needed and consequently the heat generation. To suffice these needs, high power density luminaries with lumens output in several thousand are used. Hitherto, thermal management of these luminaires was achieved through passive cooling with the help of heatsinks attached at the back of LEDs. Heatsinks utilized for this high-power density fixtures are relatively large to provide a higher surface area for heat transfer. With the larger heatsinks in the lighting system, the cost associated with packaging, mounting, manufacturing increases significantly. In addition, weight and EPA of these fixtures increases as well which has a negative impact on retrofit applications where existing infrastructure is designed for lighter weight products and replacing with higher weight and EPA product is not an optimal solution. To address these concerns, the present study focuses on utilizing an active cooling method with multiple fans placed in parallel to reduce the system size and weight. Several parameters such as fan speed, number of fins, fin height, input power, are varied to evaluate LED temperatures. Comparison is made with various design configurations and optimized design obtained through analysis is used for the final product development. Overall reduction in the weight and cost associated is then discussed in details in the summary.","PeriodicalId":385356,"journal":{"name":"Proceedings of the 8th World Congress on Mechanical, Chemical, and Material Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122030368","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}
M. Schepperle, Shayan Junaid, A. Mandal, D. Selvam, P. Woias
Extended Abstract The void fraction is one of the most critical parameters for characterizing two-phase flow boiling in microscale channels. Several important thermal-hydraulic parameters such as two-phase viscosity and two-phase density can be derived from the knowledge of the void fraction. In addition, it is used in numerous models to predict heat transfer, pressure drop and flow patterns in microchannels. The most commonly used definition of void fraction in this context is the cross-sectional void fraction, which is the ratio of the cross-sectional area occupied by the vapor phase to the total cross-sectional area at a given location in the channel [1]. This void fraction is often determined roughly by electrical impedance measurements using the Maxwell-Garnett equations, which relate impedance and void fraction [2], or with high precision by optical studies at specific locations in the microchannel. However, the lack of suitable image processing makes the optical determination of the void fraction very time-consuming, since it must be calculated manually for each frame. In this study, computer vision was applied to realize an automatic and accurate calculation of cross-sectional void fractions perpendicular to the fluid flow direction at different locations in microchannels. The void fractions of each channel location could be linked together to provide a map of the average void fraction of the entire channel. Therefore, two-phase flow boiling experiments were performed with DI water in rectangular stainless-steel microchannels with hydraulic diameters of 430 and 750 µm and lengths of 65 mm. The mass flow rate ranged from 1.5 to 5 g/min and the heat load applied to the
{"title":"Determination of Void Fraction in Microchannel Flow Boiling Using Computer Vision","authors":"M. Schepperle, Shayan Junaid, A. Mandal, D. Selvam, P. Woias","doi":"10.11159/htff22.164","DOIUrl":"https://doi.org/10.11159/htff22.164","url":null,"abstract":"Extended Abstract The void fraction is one of the most critical parameters for characterizing two-phase flow boiling in microscale channels. Several important thermal-hydraulic parameters such as two-phase viscosity and two-phase density can be derived from the knowledge of the void fraction. In addition, it is used in numerous models to predict heat transfer, pressure drop and flow patterns in microchannels. The most commonly used definition of void fraction in this context is the cross-sectional void fraction, which is the ratio of the cross-sectional area occupied by the vapor phase to the total cross-sectional area at a given location in the channel [1]. This void fraction is often determined roughly by electrical impedance measurements using the Maxwell-Garnett equations, which relate impedance and void fraction [2], or with high precision by optical studies at specific locations in the microchannel. However, the lack of suitable image processing makes the optical determination of the void fraction very time-consuming, since it must be calculated manually for each frame. In this study, computer vision was applied to realize an automatic and accurate calculation of cross-sectional void fractions perpendicular to the fluid flow direction at different locations in microchannels. The void fractions of each channel location could be linked together to provide a map of the average void fraction of the entire channel. Therefore, two-phase flow boiling experiments were performed with DI water in rectangular stainless-steel microchannels with hydraulic diameters of 430 and 750 µm and lengths of 65 mm. The mass flow rate ranged from 1.5 to 5 g/min and the heat load applied to the","PeriodicalId":385356,"journal":{"name":"Proceedings of the 8th World Congress on Mechanical, Chemical, and Material Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130012819","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}
- In copper solvent extraction, phenolic hydroxy oximes-based extractant has been observed to deteriorate progressively during extraction. Hydrolysis, rather than oxidation or Beckmann rearrangement, produce majority of the degradation products. Degradation products impact the solvent extraction method by lowering extraction efficiency, reaction kinetics, and Cu/Fe selectivity, slowing the phase disengagement time and polluting the electrolyte. Activated clay using sodium hydroxide (NaOH) was used to regenerate deteriorated extractant. After the regeneration step, the organic phase's performance improved: extraction efficiency increased from 67 to 97.3 % maximum, Cu/Fe selectivity increased from 169 to 283 and phase disengagement time decreased from 113 to 88 seconds.
{"title":"Regeneration Of Degraded Extractant By Sodium Hydroxide Activated Clay And Evaluation Of Its Per-formances In Copper Solvent Extraction","authors":"Ruffine Kishiko, W. Nheta","doi":"10.11159/mmme22.118","DOIUrl":"https://doi.org/10.11159/mmme22.118","url":null,"abstract":"- In copper solvent extraction, phenolic hydroxy oximes-based extractant has been observed to deteriorate progressively during extraction. Hydrolysis, rather than oxidation or Beckmann rearrangement, produce majority of the degradation products. Degradation products impact the solvent extraction method by lowering extraction efficiency, reaction kinetics, and Cu/Fe selectivity, slowing the phase disengagement time and polluting the electrolyte. Activated clay using sodium hydroxide (NaOH) was used to regenerate deteriorated extractant. After the regeneration step, the organic phase's performance improved: extraction efficiency increased from 67 to 97.3 % maximum, Cu/Fe selectivity increased from 169 to 283 and phase disengagement time decreased from 113 to 88 seconds.","PeriodicalId":385356,"journal":{"name":"Proceedings of the 8th World Congress on Mechanical, Chemical, and Material Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128921827","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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