The Experts below are selected from a list of 23949 Experts worldwide ranked by ideXlab platform
Yingguang Wang - One of the best experts on this subject based on the ideXlab platform.
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Investigation on the role of Drainage Structure in preventing the mass accumulation induced by shock/boundary-layer interactions in supersonic separators
Chemical Engineering and Processing - Process Intensification, 2020Co-Authors: Yingguang WangAbstract:Abstract The occurrence of shock wave in nozzle and the blockage of fluid at the so called "second throat" are closely related to the Drainage Structure of supersonic separator, which result from the thickening of the boundary layer owing to the interaction between boundary layer and shock waves. Two types of Drainage Structures are proposed to solve the above problems and promote the separation performance for gas purification. The CFD modeling is used to optimize and evaluate the different Drainage Structures. The results show that the cylindrical Drainage and the cascade Drainage can efficiently alleviate or remove the mass accumulation at the "second throat". The cascade Drainage with reflux channel and oblique openings is superior to other Drainage Structures, due to the low flow velocity and high centrifugal acceleration in the Drainage section. The flow velocity and temperature in the cascade Drainage chamber with reflux channel are opposing for separation performance of the supersonic separator. It means that high flow rate in cascade Drainage section will lead to lower temperature, but increase the number of droplets carried by airflow, and vice versa.
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Improvement of Drainage Structure and numerical investigation of droplets trajectories and separation efficiency for supersonic separators
Chemical Engineering and Processing - Process Intensification, 2020Co-Authors: Yingguang Wang, Yu Yang, Xu Dongxu, Yi Liangying, Ye Zhang, Sibo ZhangAbstract:Abstract As a new type of separation device, supersonic separator has received more and more attention in many areas. However, the interaction between boundary layer and shock wave in supersonic section results in the reverse pressure gradient and makes the boundary layer thicken, which form a so-called "second throat" that reduces the actual flow area and causes the fluid to be chocked. A novel cylinder Drainage Structure with larger Drainage area was developed. When shock wave occurs, the high pressure will make more fluid enter into the openings on cylinder Drainage Structure, which is equivalent to increase the flow capacity. Therefore, the shock wave is weakened and the total pressure loss is reduced. Moreover, the prediction model of discrete phase coupling verified by experiments was adopted in order to predict the trajectory of droplets and separation efficiency for supersonic separator. The results show that with the increase of droplet size, the separation efficiency increases gradually and the particle diameter of 2 - 4 µm is sensitive to the separation. The droplets trajectory is more clear and regular in the nozzle with reflux channel and cylindrical Drainage Structure.
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Experimental investigation and numerical analysis of separation performance for supersonic separator with novel Drainage Structure and reflux channel
Applied Thermal Engineering, 2020Co-Authors: Yingguang Wang, Yu YangAbstract:Abstract Recently, a novel supersonic separator with reflux channel has been developed that has a better refrigeration and separation performance. However, the previous studies are limited to the investigation of numerical simulation, too little attention has been paid to the experiment research. In the paper, an experimental platform for performance evaluation of the supersonic separator was established. The effects of reflux channel, Drainage Structure and operation conditions on separation performance were studied by experiment and 3d numerical simulation. The research results show that the consistency between experiment and numerical simulation can be increased by adopting material with small roughness and increasing pressure ratio. The reflux channel can effectively improve the flow field and separation performance. And the novel cylindrical Drainage Structures can weaken the interaction between shock wave and boundary layer, in favor of forming the lower and more balanced temperature field in the nozzle. The experimental investigation and simulation analysis were utilized to confirm the optimum reflux Structure: LDepth = 30 mm, Dinsert = 7 mm and Dreflow = 24 mm. The δsteam and ΔTd can reach 47.72% and 17.41 K, respectively for nozzle with reflux channel and flush Drainage, which are 9.02% and 5.42 K higher than those for nozzle with flush Drainage and without reflux channel. The circular opening Drainage without reflux channel has the greatest δsteam and ΔTd which are 48.28% and 17.98 K, respectively.
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Structure improvements and performance study of Supersonic Separation device with reflux channel
Chemical Engineering and Processing - Process Intensification, 2019Co-Authors: Yingguang Wang, Yu Yang, Ren WenwenAbstract:Abstract A new supersonic separator with reflux channel has been proposed to obtain better refrigeration and separation performance. However, the specific Structure of the new separator has not been reported so far. Moreover, the length of the conical Drainage Structure is too short to allow sufficient time to discharge the condensate. Therefore, in the paper, a new hybrid two-stage Drainage Structure is designed by adding additional side Drainage Structure after the conical Drainage Structure. Effect of the above Structure changes on separation performance are investigated with three-dimensional numerical simulation. The results show that the increasing of reflux can greatly optimize the flow field. As the reflux flow increases, the shock wave position moves backwards and the condensation area is expanded. At the same time, the centrifugal acceleration decreases which can be overcome by optimizing the exit angle of swirler blades. The hybrid two-stage Drainage Structure extends the condensation area and prolongs the time of the condensate through the outlet. Moreover, the insertion depth of 30mm, the diameter of the reflux outlet of 7mm and the diameter of the reflux channel of 24 mm are recommended based on the comprehensive consideration of good expansion characteristics and the location of the shock wave.
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Experimental and numerical investigation on the blade angle of axial-flow swirling generator and Drainage Structure for supersonic separators with diversion cone
Chemical Engineering Research & Design, 2018Co-Authors: Yingguang Wang, Dapeng HuAbstract:Abstract The effect of axial-flow swirling generator and Drainage Structure with diversion cone on separation performance is very important to supersonic separators. But there is in the absence of experimental studies on separation characteristics of above-mentioned Structure. In this paper, both experimental and numerical methods are utilized to investigate the influences of swirling generator and Drainage Structure. Good agreements are achieved between experimental data and high-order numerical simulation. The results demonstrate that the rotation strength decreases as the outlet angle of the swirler increases. The rotational flow causes the inconsistency of the radial distribution of the fluid in the nozzle and the inconsistency is more noticeable with the increase of rotation intensity. So the blade angle of swirling generator should be determined to find the balance between the expansion characteristic and swirling flow. Comparing two types of Drainage Structures, the internal extension Structure has seriously damaged the supersonic flow in the nozzle, while the flush type Drainage port has less influence on fluid. And the smaller outlet angle of Drainage port can reduce the effect of Drainage port on supersonic flow. When the pressure ratio is 1.4 for the flush type Drainage Structure, the optimal structural parameter is that the outlet angle of swirler is 55° and the inclination of the Drainage Structure is 22°. Under the optimum conditions, the ethanol removal rate is 57.06%.
Yu Yang - One of the best experts on this subject based on the ideXlab platform.
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Improvement of Drainage Structure and numerical investigation of droplets trajectories and separation efficiency for supersonic separators
Chemical Engineering and Processing - Process Intensification, 2020Co-Authors: Yingguang Wang, Yu Yang, Xu Dongxu, Yi Liangying, Ye Zhang, Sibo ZhangAbstract:Abstract As a new type of separation device, supersonic separator has received more and more attention in many areas. However, the interaction between boundary layer and shock wave in supersonic section results in the reverse pressure gradient and makes the boundary layer thicken, which form a so-called "second throat" that reduces the actual flow area and causes the fluid to be chocked. A novel cylinder Drainage Structure with larger Drainage area was developed. When shock wave occurs, the high pressure will make more fluid enter into the openings on cylinder Drainage Structure, which is equivalent to increase the flow capacity. Therefore, the shock wave is weakened and the total pressure loss is reduced. Moreover, the prediction model of discrete phase coupling verified by experiments was adopted in order to predict the trajectory of droplets and separation efficiency for supersonic separator. The results show that with the increase of droplet size, the separation efficiency increases gradually and the particle diameter of 2 - 4 µm is sensitive to the separation. The droplets trajectory is more clear and regular in the nozzle with reflux channel and cylindrical Drainage Structure.
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Experimental investigation and numerical analysis of separation performance for supersonic separator with novel Drainage Structure and reflux channel
Applied Thermal Engineering, 2020Co-Authors: Yingguang Wang, Yu YangAbstract:Abstract Recently, a novel supersonic separator with reflux channel has been developed that has a better refrigeration and separation performance. However, the previous studies are limited to the investigation of numerical simulation, too little attention has been paid to the experiment research. In the paper, an experimental platform for performance evaluation of the supersonic separator was established. The effects of reflux channel, Drainage Structure and operation conditions on separation performance were studied by experiment and 3d numerical simulation. The research results show that the consistency between experiment and numerical simulation can be increased by adopting material with small roughness and increasing pressure ratio. The reflux channel can effectively improve the flow field and separation performance. And the novel cylindrical Drainage Structures can weaken the interaction between shock wave and boundary layer, in favor of forming the lower and more balanced temperature field in the nozzle. The experimental investigation and simulation analysis were utilized to confirm the optimum reflux Structure: LDepth = 30 mm, Dinsert = 7 mm and Dreflow = 24 mm. The δsteam and ΔTd can reach 47.72% and 17.41 K, respectively for nozzle with reflux channel and flush Drainage, which are 9.02% and 5.42 K higher than those for nozzle with flush Drainage and without reflux channel. The circular opening Drainage without reflux channel has the greatest δsteam and ΔTd which are 48.28% and 17.98 K, respectively.
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Structure improvements and performance study of Supersonic Separation device with reflux channel
Chemical Engineering and Processing - Process Intensification, 2019Co-Authors: Yingguang Wang, Yu Yang, Ren WenwenAbstract:Abstract A new supersonic separator with reflux channel has been proposed to obtain better refrigeration and separation performance. However, the specific Structure of the new separator has not been reported so far. Moreover, the length of the conical Drainage Structure is too short to allow sufficient time to discharge the condensate. Therefore, in the paper, a new hybrid two-stage Drainage Structure is designed by adding additional side Drainage Structure after the conical Drainage Structure. Effect of the above Structure changes on separation performance are investigated with three-dimensional numerical simulation. The results show that the increasing of reflux can greatly optimize the flow field. As the reflux flow increases, the shock wave position moves backwards and the condensation area is expanded. At the same time, the centrifugal acceleration decreases which can be overcome by optimizing the exit angle of swirler blades. The hybrid two-stage Drainage Structure extends the condensation area and prolongs the time of the condensate through the outlet. Moreover, the insertion depth of 30mm, the diameter of the reflux outlet of 7mm and the diameter of the reflux channel of 24 mm are recommended based on the comprehensive consideration of good expansion characteristics and the location of the shock wave.
N. Goldscheider - One of the best experts on this subject based on the ideXlab platform.
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Neue Erkenntnisse zur Struktur der Karstentwässerung im aktiven Höhlensystem des Blautopfs
Grundwasser, 2013Co-Authors: Ute Lauber, W. Ufrecht, N. GoldscheiderAbstract:Der Blautopf, eine der größten Karstquellen Deutschlands, entwässert ein 165 km^2 großes Einzugsgebiet auf der Schwäbischen Alb. Dort befinden sich zwei große, aktive Karsthöhlen: das Blauhöhlensystem (10 km) und die Hessenhauhöhle (3,5 km). Aufgrund deren schwerer Zugänglichkeit war über die interne Entwässerungsstruktur dieses Karstsystems bisher nichts bekannt. Im Frühjahr 2012 wurde der erste Markierungsversuch mit Tracereingaben direkt in die beiden Höhlenflüsse durchgeführt, um die Verbindung zwischen den Höhlen zu lokalisieren. Durch zwei weitere Eingaben an der Geländeoberfläche sollte die Anbindung des Einzugsgebiets an die Höhlen erkundet werden. Mittels Feldfluorimetern wurden die Tracer-Durchgangskurven im Höhlensystem beobachtet. So konnte ein dendritischer Aufbau der unterirdischen Entwässerung nachgewiesen und für beide Höhlenflüsse eigene Teileinzugsgebiete abgegrenzt werden, die jeweils etwa 50 % zur Gesamtschüttung beitragen. Neue geologisch-tektonische Befunde ermöglichten eine verbesserte hydrogeologische Modellvorstellung. Demnach liegt ein komplexes Karstsystem mit zwei Grundwasserstockwerken und hydraulischer Kontinuität durch eine bisher als weitgehend trennend geltende Mergelformation hindurch vor. The Blautopf (“blue pot”), one of Germany’s largest karst springs, drains a catchment area of 165 km^2 in the Swabian Alb. There are two large, active caves: the Blue Cave System (10 km) and the Hessenhau Cave (3.5 km). Because of the difficult accessibility, the internal Drainage Structure had previously been unknown. The first tracer injections directly into cave streams were conducted in 2012 to localize connections between the two caves. Two surface injections in remote parts of the catchment were aimed at investigating Drainage towards the caves. Field fluorometers allowed tracer monitoring in the caves. This demonstrated the dendritic Structure of the Drainage network and identified two sub-catchments that each contribute about 50 % to the total discharge. New geologic-tectonic findings allowed an improved conceptual model, according to which the karst system consists of two aquifers with hydraulic continuity across a marl aquitard previously considered as impervious.
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Spatially resolved information on karst conduit flow from in-cave dye-tracing
Hydrology and Earth System Sciences Discussions, 2013Co-Authors: U. Lauber, W. Ufrecht, N. GoldscheiderAbstract:Abstract. Artificial tracers are powerful tools to investigate karst systems. Tracers are commonly injected into sinking streams or dolines, while springs serve as monitoring sites. The obtained flow and transport parameters represent mixed information from the vadose, epiphreatic and phreatic zones, i.e., the aquifer remains a black box. Accessible active caves constitute valuable but underexploited natural laboratories to gain detailed insights into the hydrologic functioning of the aquifer. Two multi-tracer tests in the catchment of a major karst spring (Blautopf, Germany) with injections and monitoring in two associated water caves aimed at obtaining spatially and temporally resolved information on groundwater flow in different compartments of the system. Two tracers were injected in the caves to characterize the hydraulic connections between them and with the spring. Two injections at the land surface, far from the spring, aimed at resolving the aquifer's internal Drainage Structure. Tracer breakthrough curves were monitored by field fluorimeters in caves and at the spring. Results demonstrate the dendritic Drainage Structure of the aquifer. It was possible to obtain relevant flow and transport parameters for different sections of this system. The highest mean flow velocities (275 m h−1) were observed in the near-spring epiphreatic section (open-channel flow), while velocities in the phreatic zone (pressurized flow) were one order of magnitude lower. Determined conduit water volumes confirm results of water balances and hydrograph analyses. In conclusion, experiments and monitoring in caves can deliver spatially resolved information on karst aquifer heterogeneity and dynamics that cannot be obtained by traditional investigative methods.
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Spatially resolved information on karst conduit flow from in-cave dye tracing
Hydrology and Earth System Sciences, 2013Co-Authors: U. Lauber, W. Ufrecht, N. GoldscheiderAbstract:Artificial tracers are powerful tools for investigat- ing karst systems. Tracers are commonly injected into sink- ing streams or dolines, while springs serve as monitoring sites. The obtained flow and transport parameters represent mixed information from the vadose, epiphreatic and phreatic zones (that is, the aquifer remains a black box). Accessi- ble active caves constitute valuable but underexploited nat- ural laboratories to gain detailed insights into the hydrologic functioning of the aquifer. Two multi-tracer tests in the catch- ment of a major karst spring (Blautopf, Germany) with injec- tions and monitoring in two associated water caves aimed at obtaining spatially and temporally resolved information on groundwater flow in different compartments of the sys- tem. Two tracers were injected into the caves to characterize the hydraulic connections between them and with the spring. Two injections at the land surface, far from the spring, aimed at resolving the aquifer's internal Drainage Structure. Tracer breakthrough curves were monitored by field fluorimeters in caves and at the spring. Results demonstrate the dendritic Drainage Structure of the aquifer. It was possible to obtain relevant flow and transport parameters for different sections of this system. The highest mean flow velocities (275 m h 1 ) were observed in the near-spring epiphreatic section (open- channel flow), while velocities in the phreatic zone (pressur- ized flow) were one order of magnitude lower. Determined conduit water volumes confirm results of water balances and hydrograph analyses. In conclusion, experiments and moni- toring in caves can deliver spatially resolved information on karst aquifer heterogeneity and dynamics that cannot be ob- tained by traditional investigative methods.
U. Lauber - One of the best experts on this subject based on the ideXlab platform.
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Spatially resolved information on karst conduit flow from in-cave dye-tracing
Hydrology and Earth System Sciences Discussions, 2013Co-Authors: U. Lauber, W. Ufrecht, N. GoldscheiderAbstract:Abstract. Artificial tracers are powerful tools to investigate karst systems. Tracers are commonly injected into sinking streams or dolines, while springs serve as monitoring sites. The obtained flow and transport parameters represent mixed information from the vadose, epiphreatic and phreatic zones, i.e., the aquifer remains a black box. Accessible active caves constitute valuable but underexploited natural laboratories to gain detailed insights into the hydrologic functioning of the aquifer. Two multi-tracer tests in the catchment of a major karst spring (Blautopf, Germany) with injections and monitoring in two associated water caves aimed at obtaining spatially and temporally resolved information on groundwater flow in different compartments of the system. Two tracers were injected in the caves to characterize the hydraulic connections between them and with the spring. Two injections at the land surface, far from the spring, aimed at resolving the aquifer's internal Drainage Structure. Tracer breakthrough curves were monitored by field fluorimeters in caves and at the spring. Results demonstrate the dendritic Drainage Structure of the aquifer. It was possible to obtain relevant flow and transport parameters for different sections of this system. The highest mean flow velocities (275 m h−1) were observed in the near-spring epiphreatic section (open-channel flow), while velocities in the phreatic zone (pressurized flow) were one order of magnitude lower. Determined conduit water volumes confirm results of water balances and hydrograph analyses. In conclusion, experiments and monitoring in caves can deliver spatially resolved information on karst aquifer heterogeneity and dynamics that cannot be obtained by traditional investigative methods.
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Spatially resolved information on karst conduit flow from in-cave dye tracing
Hydrology and Earth System Sciences, 2013Co-Authors: U. Lauber, W. Ufrecht, N. GoldscheiderAbstract:Artificial tracers are powerful tools for investigat- ing karst systems. Tracers are commonly injected into sink- ing streams or dolines, while springs serve as monitoring sites. The obtained flow and transport parameters represent mixed information from the vadose, epiphreatic and phreatic zones (that is, the aquifer remains a black box). Accessi- ble active caves constitute valuable but underexploited nat- ural laboratories to gain detailed insights into the hydrologic functioning of the aquifer. Two multi-tracer tests in the catch- ment of a major karst spring (Blautopf, Germany) with injec- tions and monitoring in two associated water caves aimed at obtaining spatially and temporally resolved information on groundwater flow in different compartments of the sys- tem. Two tracers were injected into the caves to characterize the hydraulic connections between them and with the spring. Two injections at the land surface, far from the spring, aimed at resolving the aquifer's internal Drainage Structure. Tracer breakthrough curves were monitored by field fluorimeters in caves and at the spring. Results demonstrate the dendritic Drainage Structure of the aquifer. It was possible to obtain relevant flow and transport parameters for different sections of this system. The highest mean flow velocities (275 m h 1 ) were observed in the near-spring epiphreatic section (open- channel flow), while velocities in the phreatic zone (pressur- ized flow) were one order of magnitude lower. Determined conduit water volumes confirm results of water balances and hydrograph analyses. In conclusion, experiments and moni- toring in caves can deliver spatially resolved information on karst aquifer heterogeneity and dynamics that cannot be ob- tained by traditional investigative methods.
Ren Wenwen - One of the best experts on this subject based on the ideXlab platform.
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Structure improvements and performance study of Supersonic Separation device with reflux channel
Chemical Engineering and Processing - Process Intensification, 2019Co-Authors: Yingguang Wang, Yu Yang, Ren WenwenAbstract:Abstract A new supersonic separator with reflux channel has been proposed to obtain better refrigeration and separation performance. However, the specific Structure of the new separator has not been reported so far. Moreover, the length of the conical Drainage Structure is too short to allow sufficient time to discharge the condensate. Therefore, in the paper, a new hybrid two-stage Drainage Structure is designed by adding additional side Drainage Structure after the conical Drainage Structure. Effect of the above Structure changes on separation performance are investigated with three-dimensional numerical simulation. The results show that the increasing of reflux can greatly optimize the flow field. As the reflux flow increases, the shock wave position moves backwards and the condensation area is expanded. At the same time, the centrifugal acceleration decreases which can be overcome by optimizing the exit angle of swirler blades. The hybrid two-stage Drainage Structure extends the condensation area and prolongs the time of the condensate through the outlet. Moreover, the insertion depth of 30mm, the diameter of the reflux outlet of 7mm and the diameter of the reflux channel of 24 mm are recommended based on the comprehensive consideration of good expansion characteristics and the location of the shock wave.
