The Experts below are selected from a list of 46980 Experts worldwide ranked by ideXlab platform
Kun Huang - One of the best experts on this subject based on the ideXlab platform.
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wettability and spreading behavior of organic extractant and its effect on formation of Gas Bubble supported organic liquid membrane for large phase ratio extraction
Chemical Engineering and Processing, 2019Co-Authors: Kun Huang, Kaiqiang Zhang, Xiaohong Wu, Zhenmin ZhaoAbstract:Abstract Our previous works suggested a novel method by spreading and covering a layer of organic extractant on the surface of Gas Bubbles to perform Gas Bubble-supported organic liquid membrane extraction at large aqueous-to-organic phase ratios. However, details about wettability and spreading kinetic behavior of organic extractant within the annular gaps between the internal Gas and the external oil needles in the injector was not clear, and so did its effect on formation of Gas Bubble-supported organic liquid membrane. In present work, spreading of P507 organic extractant on surface of two kinds of typical solid substrates, glass and PVC, with different hydrophilic-hydrophobicity is investigated. It is found that the spreading empirical coefficient k is a simple mathematical function of three crucial operation parameters in the process of Gas Bubble-supported organic membrane extraction: P507 concentration, saponification degree of P507, and pre-loading amount of rare earths in the organic phase. A feasible mathematical model is suggested for theoretical prediction of the spreading rate. Calculation based on the new model is more convenient than de Gennes’s model. The present work provides a scientific foundation for the design of hydrophilic-hydrophobicity of the materials for making the internal Gas and the external oil needles in the injector.
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chemical reaction driven spreading of an organic extractant on the Gas water interface insight into the controllable formation of a Gas Bubble supported organic extractant liquid membrane
Langmuir, 2019Co-Authors: Kun HuangAbstract:The extraction and recovery of low-concentration valuable metals from various complex aqueous solutions or industrial waste waters have attracted extensive interests in recent years. In our previous works, we suggested a novel technique called bubbling organic liquid membrane extraction by spreading and covering an organic extractant with extremely small volume on the surface of Gas Bubbles to form a layer of the Gas Bubble-supported organic liquid membrane for selective extraction and enrichment of low-concentration targets from dilute aqueous solutions. It was found that for successfully performing the bubbling organic liquid membrane extraction, a prerequisite is knowing how to control the formation of a stable organic liquid membrane covered on the surface of Gas Bubbles. However, once the organic extractant starts to spread on the surface of Gas Bubbles, the extraction chemical reaction at the interface between the organic extractant liquid membrane and the rare-earth aqueous solution will occur. In ...
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chemical reaction driven spreading of an organic extractant on the Gas water interface insight into the controllable formation of a Gas Bubble supported organic extractant liquid membrane
Langmuir, 2019Co-Authors: Jie Liu, Kun Huang, Wenqian Liu, Huizhou LiuAbstract:The extraction and recovery of low-concentration valuable metals from various complex aqueous solutions or industrial waste waters have attracted extensive interests in recent years. In our previous works, we suggested a novel technique called bubbling organic liquid membrane extraction by spreading and covering an organic extractant with extremely small volume on the surface of Gas Bubbles to form a layer of the Gas Bubble-supported organic liquid membrane for selective extraction and enrichment of low-concentration targets from dilute aqueous solutions. It was found that for successfully performing the bubbling organic liquid membrane extraction, a prerequisite is knowing how to control the formation of a stable organic liquid membrane covered on the surface of Gas Bubbles. However, once the organic extractant starts to spread on the surface of Gas Bubbles, the extraction chemical reaction at the interface between the organic extractant liquid membrane and the rare-earth aqueous solution will occur. In the present work, the spreading behavior of the organic extractant P507 on the surface of rare-earth aqueous solutions was investigated and was compared with the behaviors on the surface of deionized water. It was revealed that the spreading of the organic extractant P507 on the surface of aqueous solutions containing rare-earth ions was accelerated because of the occurrence of the chemical reactions at the Gas-water interface. The difference in the spreading rate of organic extractant P507 liquid droplets on the surface of deionized water and on that of Er(III) aqueous solutions with an increase in the P507 concentration, the saponification degrees of the P507 extractant, and the preloading amount of Er(III) in the P507 extractant revealed that the chemical reaction at the interface between the spreading P507 thin liquid membrane and the Er(III) aqueous solution would result in the Marangoni convection along the interface, which is in favor of overcoming the resistance from the viscous force when the surface tension gradient replaces gravity as a dominant driving force for the spreading. The present work provides an experimental foundation toward understanding the effect of the interfacial chemical reaction on the spreading behavior of an organic oil droplet on the Gas-water interface. It is beneficial for the development of our suggested new technique of bubbling organic liquid membrane extraction and to achieve a controllable generation of a stable Gas Bubble-supported organic liquid membrane for performing solvent extraction at large aqueous-to-oil phase ratios.
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Chemical Reaction-Driven Spreading of an Organic Extractant on the Gas–Water Interface: Insight into the Controllable Formation of a Gas Bubble-Supported Organic Extractant Liquid Membrane
2019Co-Authors: Jie Liu, Kun Huang, Wenqian Liu, Huizhou LiuAbstract:The extraction and recovery of low-concentration valuable metals from various complex aqueous solutions or industrial waste waters have attracted extensive interests in recent years. In our previous works, we suggested a novel technique called bubbling organic liquid membrane extraction by spreading and covering an organic extractant with extremely small volume on the surface of Gas Bubbles to form a layer of the Gas Bubble-supported organic liquid membrane for selective extraction and enrichment of low-concentration targets from dilute aqueous solutions. It was found that for successfully performing the bubbling organic liquid membrane extraction, a prerequisite is knowing how to control the formation of a stable organic liquid membrane covered on the surface of Gas Bubbles. However, once the organic extractant starts to spread on the surface of Gas Bubbles, the extraction chemical reaction at the interface between the organic extractant liquid membrane and the rare-earth aqueous solution will occur. In the present work, the spreading behavior of the organic extractant P507 on the surface of rare-earth aqueous solutions was investigated and was compared with the behaviors on the surface of deionized water. It was revealed that the spreading of the organic extractant P507 on the surface of aqueous solutions containing rare-earth ions was accelerated because of the occurrence of the chemical reactions at the Gas–water interface. The difference in the spreading rate of organic extractant P507 liquid droplets on the surface of deionized water and on that of Er(III) aqueous solutions with an increase in the P507 concentration, the saponification degrees of the P507 extractant, and the preloading amount of Er(III) in the P507 extractant revealed that the chemical reaction at the interface between the spreading P507 thin liquid membrane and the Er(III) aqueous solution would result in the Marangoni convection along the interface, which is in favor of overcoming the resistance from the viscous force when the surface tension gradient replaces gravity as a dominant driving force for the spreading. The present work provides an experimental foundation toward understanding the effect of the interfacial chemical reaction on the spreading behavior of an organic oil droplet on the Gas–water interface. It is beneficial for the development of our suggested new technique of bubbling organic liquid membrane extraction and to achieve a controllable generation of a stable Gas Bubble-supported organic liquid membrane for performing solvent extraction at large aqueous-to-oil phase ratios
H W Weijers - One of the best experts on this subject based on the ideXlab platform.
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Impact of Trapped Helium Gas Bubble in Liquid Helium on the Cooling in High Magnetic Field
IEEE Transactions on Applied Superconductivity, 2015Co-Authors: W D Markiewicz, H W Weijers, A. Voran, P. D. Noyes, B. Jarvis, W. R. Sheppard, Z. L. Johnson, S. R. Gundlach, S T HannahsAbstract:Liquid helium is used as the coolant for high field superconducting magnets or samples tested in the high magnetic field at the National High Magnetic Field Laboratory. When the magnetic field is ramping up, the boil-off helium Gas generated by heat losses in the coil and from external environment of the cryostat can be trapped in the liquid helium bath in a region where Bz · dBz/dz is less than -2100 T2 due to the weakly diamagnetic property of helium. It results to the surfaces of the magnet or samples being covered partially or even fully with the accumulated helium Gas instead of liquid helium. The very low thermal conductivity of helium Gas may cause an inefficient cooling for the magnets or samples. In the beginning stage of YBCO coils development, the trapped Gas Bubble caused a temperature increase in the region of trapped Gas Bubble and prevented the test coils ramped up to a higher current. This raised an issue for the cooling of the 32-T magnet, which is to be cooled in a liquid helium bath, because the trapped Gas Bubble may cause inefficient cooling of the magnet in this Gas Bubble region. Relevant tests were performed, and the trapped Gas Bubble was observed in recent tests of the 32-T magnet prototype coils. The impact of the Gas Bubble on the cooling of the 32-T YBCO prototype coils was tested, and the test results are presented.
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helium Gas Bubble trapped in liquid helium in high magnetic field
Applied Physics Letters, 2014Co-Authors: S T Hannahs, W D Markiewicz, H W WeijersAbstract:High magnetic field magnets are used widely in the area of the condensed matter physics, material science, chemistry, geochemistry, and biology at the National High Magnetic Field Laboratory. New high field magnets of state-of-the-art are being pursued and developed at the lab, such as the current developing 32 T, 32 mm bore fully superconducting magnet. Liquid Helium (LHe) is used as the coolant for superconducting magnets or samples tested in a high magnetic field. When the magnetic field reaches a relatively high value the boil-off helium Gas Bubble generated by heat losses in the cryostat can be trapped in the LHe bath in the region where BzdBz/dz is less than negative 2100 T2/m, instead of floating up to the top of LHe. Then the magnet or sample in the trapped Bubble region may lose efficient cooling. In the development of the 32 T magnet, a prototype Yttrium Barium Copper Oxide coil of 6 double pancakes with an inner diameter of 40 mm and an outer diameter of 140 mm was fabricated and tested in a re...
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helium Gas Bubble trapped in liquid helium in high magnetic field
Applied Physics Letters, 2014Co-Authors: Hongyu Bai, S T Hannahs, W D Markiewicz, H W WeijersAbstract:High magnetic field magnets are used widely in the area of the condensed matter physics, material science, chemistry, geochemistry, and biology at the National High Magnetic Field Laboratory. New high field magnets of state-of-the-art are being pursued and developed at the lab, such as the current developing 32 T, 32 mm bore fully superconducting magnet. Liquid Helium (LHe) is used as the coolant for superconducting magnets or samples tested in a high magnetic field. When the magnetic field reaches a relatively high value the boil-off helium Gas Bubble generated by heat losses in the cryostat can be trapped in the LHe bath in the region where BzdBz/dz is less than negative 2100 T2/m, instead of floating up to the top of LHe. Then the magnet or sample in the trapped Bubble region may lose efficient cooling. In the development of the 32 T magnet, a prototype Yttrium Barium Copper Oxide coil of 6 double pancakes with an inner diameter of 40 mm and an outer diameter of 140 mm was fabricated and tested in a resistive magnet providing a background field of 15 T. The trapped Gas Bubble was observed in the tests when the prototype coil was ramped up to 7.5 T at a current of 200 A. This letter reports the test results on the trapped Gas Bubble and the comparison with the analytical results which shows they are in a good agreement.
Akira Kariyasaki - One of the best experts on this subject based on the ideXlab platform.
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behavior of a single coherent Gas Bubble chain and surrounding liquid jet flow structure
Chemical Engineering Science, 2005Co-Authors: Toshiyuki Sanada, Tohru Fukano, Masao Watanabe, Akira KariyasakiAbstract:Abstract The motion of a single nitrogen Gas Bubble chain and the structure of water flow field surrounding the chain were experimentally studied. We developed a Bubble generator that can control both the Bubble diameter and the generation frequency independently. Experimental conditions of Bubble Reynolds number and Bubble distance divided by Bubble diameter were from 300 to 650 and from 6.5 to 300, respectively. We discuss the interaction effects on the motion of each Bubble rising in a chain, as compared to the effects of a single rising Bubble. The Bubble trajectories and the surrounding water flow fields in the state of Bubbles rising in a chain were investigated using a high-speed digital video camera and an analog single-lens-reflex camera. We observed two important physical phenomena. First, Bubbles passed through a nearly identical path in the case of low frequency of Bubble production. On the contrary, at a height of approximately 50 mm from the nozzle, the Bubbles in the case of high frequency deviated and scattered from this path due to Bubble–Bubble interaction. Second, with higher Bubble production frequency, coherent Bubble chain and the characteristic structure of the surrounding water flow called “liquid jet” were observed near the nozzle. The direction of liquid jet flow differed from the Bubble trajectory. We theoretically investigated the relation of coherent Bubble chain and liquid jet by applying the conservation of liquid momentum.
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behavior of a single coherent Gas Bubble chain and surrounding liquid jet flow structure
Chemical Engineering Science, 2005Co-Authors: Toshiyuki Sanada, Tohru Fukano, Masao Watanabe, Akira KariyasakiAbstract:Abstract The motion of a single nitrogen Gas Bubble chain and the structure of water flow field surrounding the chain were experimentally studied. We developed a Bubble generator that can control both the Bubble diameter and the generation frequency independently. Experimental conditions of Bubble Reynolds number and Bubble distance divided by Bubble diameter were from 300 to 650 and from 6.5 to 300, respectively. We discuss the interaction effects on the motion of each Bubble rising in a chain, as compared to the effects of a single rising Bubble. The Bubble trajectories and the surrounding water flow fields in the state of Bubbles rising in a chain were investigated using a high-speed digital video camera and an analog single-lens-reflex camera. We observed two important physical phenomena. First, Bubbles passed through a nearly identical path in the case of low frequency of Bubble production. On the contrary, at a height of approximately 50 mm from the nozzle, the Bubbles in the case of high frequency deviated and scattered from this path due to Bubble–Bubble interaction. Second, with higher Bubble production frequency, coherent Bubble chain and the characteristic structure of the surrounding water flow called “liquid jet” were observed near the nozzle. The direction of liquid jet flow differed from the Bubble trajectory. We theoretically investigated the relation of coherent Bubble chain and liquid jet by applying the conservation of liquid momentum.
Huizhou Liu - One of the best experts on this subject based on the ideXlab platform.
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chemical reaction driven spreading of an organic extractant on the Gas water interface insight into the controllable formation of a Gas Bubble supported organic extractant liquid membrane
Langmuir, 2019Co-Authors: Jie Liu, Kun Huang, Wenqian Liu, Huizhou LiuAbstract:The extraction and recovery of low-concentration valuable metals from various complex aqueous solutions or industrial waste waters have attracted extensive interests in recent years. In our previous works, we suggested a novel technique called bubbling organic liquid membrane extraction by spreading and covering an organic extractant with extremely small volume on the surface of Gas Bubbles to form a layer of the Gas Bubble-supported organic liquid membrane for selective extraction and enrichment of low-concentration targets from dilute aqueous solutions. It was found that for successfully performing the bubbling organic liquid membrane extraction, a prerequisite is knowing how to control the formation of a stable organic liquid membrane covered on the surface of Gas Bubbles. However, once the organic extractant starts to spread on the surface of Gas Bubbles, the extraction chemical reaction at the interface between the organic extractant liquid membrane and the rare-earth aqueous solution will occur. In the present work, the spreading behavior of the organic extractant P507 on the surface of rare-earth aqueous solutions was investigated and was compared with the behaviors on the surface of deionized water. It was revealed that the spreading of the organic extractant P507 on the surface of aqueous solutions containing rare-earth ions was accelerated because of the occurrence of the chemical reactions at the Gas-water interface. The difference in the spreading rate of organic extractant P507 liquid droplets on the surface of deionized water and on that of Er(III) aqueous solutions with an increase in the P507 concentration, the saponification degrees of the P507 extractant, and the preloading amount of Er(III) in the P507 extractant revealed that the chemical reaction at the interface between the spreading P507 thin liquid membrane and the Er(III) aqueous solution would result in the Marangoni convection along the interface, which is in favor of overcoming the resistance from the viscous force when the surface tension gradient replaces gravity as a dominant driving force for the spreading. The present work provides an experimental foundation toward understanding the effect of the interfacial chemical reaction on the spreading behavior of an organic oil droplet on the Gas-water interface. It is beneficial for the development of our suggested new technique of bubbling organic liquid membrane extraction and to achieve a controllable generation of a stable Gas Bubble-supported organic liquid membrane for performing solvent extraction at large aqueous-to-oil phase ratios.
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Chemical Reaction-Driven Spreading of an Organic Extractant on the Gas–Water Interface: Insight into the Controllable Formation of a Gas Bubble-Supported Organic Extractant Liquid Membrane
2019Co-Authors: Jie Liu, Kun Huang, Wenqian Liu, Huizhou LiuAbstract:The extraction and recovery of low-concentration valuable metals from various complex aqueous solutions or industrial waste waters have attracted extensive interests in recent years. In our previous works, we suggested a novel technique called bubbling organic liquid membrane extraction by spreading and covering an organic extractant with extremely small volume on the surface of Gas Bubbles to form a layer of the Gas Bubble-supported organic liquid membrane for selective extraction and enrichment of low-concentration targets from dilute aqueous solutions. It was found that for successfully performing the bubbling organic liquid membrane extraction, a prerequisite is knowing how to control the formation of a stable organic liquid membrane covered on the surface of Gas Bubbles. However, once the organic extractant starts to spread on the surface of Gas Bubbles, the extraction chemical reaction at the interface between the organic extractant liquid membrane and the rare-earth aqueous solution will occur. In the present work, the spreading behavior of the organic extractant P507 on the surface of rare-earth aqueous solutions was investigated and was compared with the behaviors on the surface of deionized water. It was revealed that the spreading of the organic extractant P507 on the surface of aqueous solutions containing rare-earth ions was accelerated because of the occurrence of the chemical reactions at the Gas–water interface. The difference in the spreading rate of organic extractant P507 liquid droplets on the surface of deionized water and on that of Er(III) aqueous solutions with an increase in the P507 concentration, the saponification degrees of the P507 extractant, and the preloading amount of Er(III) in the P507 extractant revealed that the chemical reaction at the interface between the spreading P507 thin liquid membrane and the Er(III) aqueous solution would result in the Marangoni convection along the interface, which is in favor of overcoming the resistance from the viscous force when the surface tension gradient replaces gravity as a dominant driving force for the spreading. The present work provides an experimental foundation toward understanding the effect of the interfacial chemical reaction on the spreading behavior of an organic oil droplet on the Gas–water interface. It is beneficial for the development of our suggested new technique of bubbling organic liquid membrane extraction and to achieve a controllable generation of a stable Gas Bubble-supported organic liquid membrane for performing solvent extraction at large aqueous-to-oil phase ratios
Toshiyuki Sanada - One of the best experts on this subject based on the ideXlab platform.
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behavior of a single coherent Gas Bubble chain and surrounding liquid jet flow structure
Chemical Engineering Science, 2005Co-Authors: Toshiyuki Sanada, Tohru Fukano, Masao Watanabe, Akira KariyasakiAbstract:Abstract The motion of a single nitrogen Gas Bubble chain and the structure of water flow field surrounding the chain were experimentally studied. We developed a Bubble generator that can control both the Bubble diameter and the generation frequency independently. Experimental conditions of Bubble Reynolds number and Bubble distance divided by Bubble diameter were from 300 to 650 and from 6.5 to 300, respectively. We discuss the interaction effects on the motion of each Bubble rising in a chain, as compared to the effects of a single rising Bubble. The Bubble trajectories and the surrounding water flow fields in the state of Bubbles rising in a chain were investigated using a high-speed digital video camera and an analog single-lens-reflex camera. We observed two important physical phenomena. First, Bubbles passed through a nearly identical path in the case of low frequency of Bubble production. On the contrary, at a height of approximately 50 mm from the nozzle, the Bubbles in the case of high frequency deviated and scattered from this path due to Bubble–Bubble interaction. Second, with higher Bubble production frequency, coherent Bubble chain and the characteristic structure of the surrounding water flow called “liquid jet” were observed near the nozzle. The direction of liquid jet flow differed from the Bubble trajectory. We theoretically investigated the relation of coherent Bubble chain and liquid jet by applying the conservation of liquid momentum.
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behavior of a single coherent Gas Bubble chain and surrounding liquid jet flow structure
Chemical Engineering Science, 2005Co-Authors: Toshiyuki Sanada, Tohru Fukano, Masao Watanabe, Akira KariyasakiAbstract:Abstract The motion of a single nitrogen Gas Bubble chain and the structure of water flow field surrounding the chain were experimentally studied. We developed a Bubble generator that can control both the Bubble diameter and the generation frequency independently. Experimental conditions of Bubble Reynolds number and Bubble distance divided by Bubble diameter were from 300 to 650 and from 6.5 to 300, respectively. We discuss the interaction effects on the motion of each Bubble rising in a chain, as compared to the effects of a single rising Bubble. The Bubble trajectories and the surrounding water flow fields in the state of Bubbles rising in a chain were investigated using a high-speed digital video camera and an analog single-lens-reflex camera. We observed two important physical phenomena. First, Bubbles passed through a nearly identical path in the case of low frequency of Bubble production. On the contrary, at a height of approximately 50 mm from the nozzle, the Bubbles in the case of high frequency deviated and scattered from this path due to Bubble–Bubble interaction. Second, with higher Bubble production frequency, coherent Bubble chain and the characteristic structure of the surrounding water flow called “liquid jet” were observed near the nozzle. The direction of liquid jet flow differed from the Bubble trajectory. We theoretically investigated the relation of coherent Bubble chain and liquid jet by applying the conservation of liquid momentum.
