The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform
Meng Tang - One of the best experts on this subject based on the ideXlab platform.
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flow characteristics of blade unit of a tridimensional rotational flow Sieve Tray under concurrent gas liquid flow
Authorea Preprints, 2020Co-Authors: Hongkai Wang, Meng Tang, Dewu Wang, Yishuo Zhang, Ruojin Wang, Baisong Hu, Shaofeng ZhangAbstract:The flow characteristics of the blade unit of a tridimensional rotational flow Sieve Tray was investigated experimentally in this study. First, the flow patterns are defined under different liquid arrangement methods. They are bilateral film flow, continuous perforated flow, and dispersion-mixing flow in overflow distribution and film and jet flow and jet and mixed flow in spray distribution. Second, the time and frequency domain analysis of the differential pressure pulsation signal in the blade unit is carried out. The influence of perforation and mixing intensity on the flow pattern transition is clarified. Third, the rotational flow ratio of the gas-liquid phase is measured. The influence of the operating conditions on the distribution of the rotational and perforated flow for the gas-liquid phase is investigated. Finally, a prediction model for the rotational flow ratio is proposed. The prediction results agree well with the experimental data.
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cfd simulation of gas flow field distribution and design optimization of the tridimensional rotational flow Sieve Tray with different structural parameters
Chemical Engineering Science, 2019Co-Authors: Meng Tang, Dewu Wang, Yishuo Zhang, Shaofeng Zhang, Lusha WangAbstract:Abstract Using CFD simulation, we first investigated the flow field distribution of the tridimensional rotational flow Sieve Tray (TRST) under different structural parameters (i.e. number of the blades, twist angle of the blades, Tray height and Sieve hole diameter) and installation methods (forward and backward) when gas flows downward through the TRST. Secondly, we carried out a comparative study of three modified structures of the Tray, i.e. no supporting ring, a closed internal cylinder and no Sieve holes present. Finally, we studied the transformed situations of the rotational flow and propose a dimensionless correlation to evaluate the performance of the Tray. The results show that, apart from the Tray with a smaller twist angle of the blade, the gas flow field distributions for all the other types of Trays are similar. When two Trays are installed, the gas flow field of the second Tray in a forward installation is obviously different to that of a backward installation. The transformed position of the rotational flow for most types of Trays is about half the depth of the Tray. After comprehensive evaluation, the optimized Tray structures are identified as a configuration with 8 blades, a 90° twist angle of the blades, a Tray height of 40 mm, and Sieve holes of 5 mm diameter. In addition, the Tray should have open internal cylinder without a supporting ring. When a multi-Tray is installed, the backward installation method should be adopted.
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experimental study and modeling development of pressure drop in concurrent gas liquid columns with a tridimensional rotational flow Sieve Tray
Chemical Engineering Science, 2018Co-Authors: Meng Tang, Dewu Wang, Shaofeng Zhang, Lusha WangAbstract:Abstract A novel column internal is proposed, named the tridimensional rotational flow Sieve Tray (TRST), which has a three-dimensional hollow structure that can make the gas form two kinds of flow pattern coupled with each other: one is rotational flow and the other is flow through the perforations. Using an air-liquid system, we experimentally measured the pressure drops (dry and wet) when gas-liquid flows concurrently downwards through the TRST. We also examined the effects of gas-liquid flux, various geometric parameters of the TRST (i.e. number of blades, twist angles of the blades, Tray heights and Sieve hole diameters), Tray installation methods (forward and backward) and number of installed Trays on the pressure drop. The results indicate that the pressure drop increases with increasing gas-liquid flux, number and twist angles of the blades, but decreases with increasing Tray heights and Sieve hole diameters. The pressure drop of the Tray is largest in backward installation, smaller in first installed location and smallest in forward installation. Compared with other new types of Trays, the pressure drop of the TRST is lower and there is a significant resistance performance advantage. In addition, according to the mechanism of gas-liquid flow in the TRST, we established the mathematical model of TRST performance in the range of operating conditions. The fitting values agree well with the experimental values.
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cfd simulation and experimental study of dry pressure drop and gas flow distribution of the tridimensional rotational flow Sieve Tray
Chemical Engineering Research & Design, 2017Co-Authors: Meng Tang, Dewu Wang, Shaofeng Zhang, Yishuo ZhangAbstract:Abstract A novel column internal was proposed, named tridimensional rotational flow Sieve Tray(TRST). Using CFD simulation and experimental methods, we examined the dry pressure drop and gas flow distribution when gas flows downward through the TRST. The results indicate that compared with other common Trays, the dry pressure drop of TRST is lower (less than 70 Pa). In the TRST, there are two kinds of gas flows: one is the rotational flow between the adjacent two twisted Sieve blades, the other is the flow through perforations at the Sieve holes. They are coupled with each other. Subjected to diversion and restriction from the twisted Sieve blades, in the upper part of the Tray, the gas is at the stage of starting rotational flow, the velocity is lower and the static pressure is larger, both the forward and backward flow through perforations exist; in the middle and lower part of the Tray, the gas is at the stage of full developed rotational flow, the velocity is larger, the static pressure is lower and the flow through perforations of gas is all in forward.
James R Fair - One of the best experts on this subject based on the ideXlab platform.
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a fundamental model for the prediction of distillation Sieve Tray efficiency 1 database development
Industrial & Engineering Chemistry Research, 2000Co-Authors: James R FairAbstract:A mechanistic model has been developed for the prediction of Sieve Tray point efficiency for both aqueous and hydrocarbon systems. A forerunner of the model was developed from fundamental relationships by Prado and Fair (Ind. Eng. Chem. Res. 1990, 29, 1031) and was based on gas−liquid transfer in systems predominantly air and water. The earlier model has now been modified and extended. Contacting on a Sieve Tray is considered analogous to gas−liquid contacting in a mechanically agitated vessel, and supporting research has been adapted to the Tray-contacting case. Studies in bubble columns have provided information on bubble size distribution and bubble stability at high pressure; these studies coupled with isotropic flow theory have formed the basis for correlating bubble size distribution as well as the fraction of small bubbles in the Sieve Tray froth. New Tray efficiency data taken on a semi-industrial scale have been combined with published data as well as new data released by Fractionation Research, ...
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a fundamental model for the prediction of distillation Sieve Tray efficiency 2 model development and validation
Industrial & Engineering Chemistry Research, 2000Co-Authors: James R FairAbstract:A mechanistic model has been developed for the prediction of Sieve Tray point efficiency for both aqueous and hydrocarbon systems. A forerunner of the model was developed from fundamental relationships by Prado and Fair in 1990 and was based on gas−liquid transfer in systems of predominantly air and water. The earlier model has now been modified and extended. Contacting on a Sieve Tray is considered analogous to gas−liquid contacting in a mechanically agitated vessel, and supporting research has been adapted to the Tray-contacting case. Studies in bubble columns have provided information on bubble size distribution and bubble stability at high pressure; these studies coupled with isotropic flow theory have formed the basis for correlating bubble size distribution as well as the fraction of small bubbles in the Sieve Tray froth. New Tray efficiency data taken on a semi-industrial scale have been combined with published data as well as new data released by Fractionation Research, Inc. to form a large databa...
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Sieve Tray extractor continuous phase mixing
Industrial & Engineering Chemistry Research, 1999Co-Authors: Bruce R Eldridge, James R FairAbstract:The continuous-phase-mixing characteristics of a Sieve-Tray extractor were studied in a specially designed single-stage experimental apparatus. Two chemical systems were studied: toluene−water and n-butanol−water. The degree of continuous-phase axial mixing was determined for various Tray geometries and phase flow rates. A predictive model was developed and combined with a point efficiency correlation to yield an overall Tray efficiency. The results indicate that the level of continuous-phase mixing does not significantly affect the overall mass-transfer efficiency of an extractor Sieve Tray.
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fundamental model for the prediction of Sieve Tray efficiency
Industrial & Engineering Chemistry Research, 1990Co-Authors: Miguel Prado, James R FairAbstract:Fundamental considerations of Sieve Tray hydraulics, such as hole activity (jet and bubble formation), bubble sizes and rise velocities, and average void fraction have been combined with diffusional mechanisms to develop a model for predicting mass transfer on an active Sieve Tray. Experiments were conducted to support model development. A computer-based data acquisition circuitry was designed and built to monitor digitally and simultaneously eight electroresistivity probes, independently located in separate holes of a Sieve Tray of an air-water simulator. With this monitoring system, it was possible to determine bubble size formation distributions and, importantly, the fraction of active holes that were either jetting or bubbling under a given set of hydrodynamic conditions. In addition, concurrent gas- and liquid-phase resistant mass-transfer efficiencies were measured
Lusha Wang - One of the best experts on this subject based on the ideXlab platform.
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cfd simulation of gas flow field distribution and design optimization of the tridimensional rotational flow Sieve Tray with different structural parameters
Chemical Engineering Science, 2019Co-Authors: Meng Tang, Dewu Wang, Yishuo Zhang, Shaofeng Zhang, Lusha WangAbstract:Abstract Using CFD simulation, we first investigated the flow field distribution of the tridimensional rotational flow Sieve Tray (TRST) under different structural parameters (i.e. number of the blades, twist angle of the blades, Tray height and Sieve hole diameter) and installation methods (forward and backward) when gas flows downward through the TRST. Secondly, we carried out a comparative study of three modified structures of the Tray, i.e. no supporting ring, a closed internal cylinder and no Sieve holes present. Finally, we studied the transformed situations of the rotational flow and propose a dimensionless correlation to evaluate the performance of the Tray. The results show that, apart from the Tray with a smaller twist angle of the blade, the gas flow field distributions for all the other types of Trays are similar. When two Trays are installed, the gas flow field of the second Tray in a forward installation is obviously different to that of a backward installation. The transformed position of the rotational flow for most types of Trays is about half the depth of the Tray. After comprehensive evaluation, the optimized Tray structures are identified as a configuration with 8 blades, a 90° twist angle of the blades, a Tray height of 40 mm, and Sieve holes of 5 mm diameter. In addition, the Tray should have open internal cylinder without a supporting ring. When a multi-Tray is installed, the backward installation method should be adopted.
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experimental study and modeling development of pressure drop in concurrent gas liquid columns with a tridimensional rotational flow Sieve Tray
Chemical Engineering Science, 2018Co-Authors: Meng Tang, Dewu Wang, Shaofeng Zhang, Lusha WangAbstract:Abstract A novel column internal is proposed, named the tridimensional rotational flow Sieve Tray (TRST), which has a three-dimensional hollow structure that can make the gas form two kinds of flow pattern coupled with each other: one is rotational flow and the other is flow through the perforations. Using an air-liquid system, we experimentally measured the pressure drops (dry and wet) when gas-liquid flows concurrently downwards through the TRST. We also examined the effects of gas-liquid flux, various geometric parameters of the TRST (i.e. number of blades, twist angles of the blades, Tray heights and Sieve hole diameters), Tray installation methods (forward and backward) and number of installed Trays on the pressure drop. The results indicate that the pressure drop increases with increasing gas-liquid flux, number and twist angles of the blades, but decreases with increasing Tray heights and Sieve hole diameters. The pressure drop of the Tray is largest in backward installation, smaller in first installed location and smallest in forward installation. Compared with other new types of Trays, the pressure drop of the TRST is lower and there is a significant resistance performance advantage. In addition, according to the mechanism of gas-liquid flow in the TRST, we established the mathematical model of TRST performance in the range of operating conditions. The fitting values agree well with the experimental values.
Shaofeng Zhang - One of the best experts on this subject based on the ideXlab platform.
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flow characteristics of blade unit of a tridimensional rotational flow Sieve Tray under concurrent gas liquid flow
Authorea Preprints, 2020Co-Authors: Hongkai Wang, Meng Tang, Dewu Wang, Yishuo Zhang, Ruojin Wang, Baisong Hu, Shaofeng ZhangAbstract:The flow characteristics of the blade unit of a tridimensional rotational flow Sieve Tray was investigated experimentally in this study. First, the flow patterns are defined under different liquid arrangement methods. They are bilateral film flow, continuous perforated flow, and dispersion-mixing flow in overflow distribution and film and jet flow and jet and mixed flow in spray distribution. Second, the time and frequency domain analysis of the differential pressure pulsation signal in the blade unit is carried out. The influence of perforation and mixing intensity on the flow pattern transition is clarified. Third, the rotational flow ratio of the gas-liquid phase is measured. The influence of the operating conditions on the distribution of the rotational and perforated flow for the gas-liquid phase is investigated. Finally, a prediction model for the rotational flow ratio is proposed. The prediction results agree well with the experimental data.
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cfd simulation of gas flow field distribution and design optimization of the tridimensional rotational flow Sieve Tray with different structural parameters
Chemical Engineering Science, 2019Co-Authors: Meng Tang, Dewu Wang, Yishuo Zhang, Shaofeng Zhang, Lusha WangAbstract:Abstract Using CFD simulation, we first investigated the flow field distribution of the tridimensional rotational flow Sieve Tray (TRST) under different structural parameters (i.e. number of the blades, twist angle of the blades, Tray height and Sieve hole diameter) and installation methods (forward and backward) when gas flows downward through the TRST. Secondly, we carried out a comparative study of three modified structures of the Tray, i.e. no supporting ring, a closed internal cylinder and no Sieve holes present. Finally, we studied the transformed situations of the rotational flow and propose a dimensionless correlation to evaluate the performance of the Tray. The results show that, apart from the Tray with a smaller twist angle of the blade, the gas flow field distributions for all the other types of Trays are similar. When two Trays are installed, the gas flow field of the second Tray in a forward installation is obviously different to that of a backward installation. The transformed position of the rotational flow for most types of Trays is about half the depth of the Tray. After comprehensive evaluation, the optimized Tray structures are identified as a configuration with 8 blades, a 90° twist angle of the blades, a Tray height of 40 mm, and Sieve holes of 5 mm diameter. In addition, the Tray should have open internal cylinder without a supporting ring. When a multi-Tray is installed, the backward installation method should be adopted.
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experimental study and modeling development of pressure drop in concurrent gas liquid columns with a tridimensional rotational flow Sieve Tray
Chemical Engineering Science, 2018Co-Authors: Meng Tang, Dewu Wang, Shaofeng Zhang, Lusha WangAbstract:Abstract A novel column internal is proposed, named the tridimensional rotational flow Sieve Tray (TRST), which has a three-dimensional hollow structure that can make the gas form two kinds of flow pattern coupled with each other: one is rotational flow and the other is flow through the perforations. Using an air-liquid system, we experimentally measured the pressure drops (dry and wet) when gas-liquid flows concurrently downwards through the TRST. We also examined the effects of gas-liquid flux, various geometric parameters of the TRST (i.e. number of blades, twist angles of the blades, Tray heights and Sieve hole diameters), Tray installation methods (forward and backward) and number of installed Trays on the pressure drop. The results indicate that the pressure drop increases with increasing gas-liquid flux, number and twist angles of the blades, but decreases with increasing Tray heights and Sieve hole diameters. The pressure drop of the Tray is largest in backward installation, smaller in first installed location and smallest in forward installation. Compared with other new types of Trays, the pressure drop of the TRST is lower and there is a significant resistance performance advantage. In addition, according to the mechanism of gas-liquid flow in the TRST, we established the mathematical model of TRST performance in the range of operating conditions. The fitting values agree well with the experimental values.
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cfd simulation and experimental study of dry pressure drop and gas flow distribution of the tridimensional rotational flow Sieve Tray
Chemical Engineering Research & Design, 2017Co-Authors: Meng Tang, Dewu Wang, Shaofeng Zhang, Yishuo ZhangAbstract:Abstract A novel column internal was proposed, named tridimensional rotational flow Sieve Tray(TRST). Using CFD simulation and experimental methods, we examined the dry pressure drop and gas flow distribution when gas flows downward through the TRST. The results indicate that compared with other common Trays, the dry pressure drop of TRST is lower (less than 70 Pa). In the TRST, there are two kinds of gas flows: one is the rotational flow between the adjacent two twisted Sieve blades, the other is the flow through perforations at the Sieve holes. They are coupled with each other. Subjected to diversion and restriction from the twisted Sieve blades, in the upper part of the Tray, the gas is at the stage of starting rotational flow, the velocity is lower and the static pressure is larger, both the forward and backward flow through perforations exist; in the middle and lower part of the Tray, the gas is at the stage of full developed rotational flow, the velocity is larger, the static pressure is lower and the flow through perforations of gas is all in forward.
Yishuo Zhang - One of the best experts on this subject based on the ideXlab platform.
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flow characteristics of blade unit of a tridimensional rotational flow Sieve Tray under concurrent gas liquid flow
Authorea Preprints, 2020Co-Authors: Hongkai Wang, Meng Tang, Dewu Wang, Yishuo Zhang, Ruojin Wang, Baisong Hu, Shaofeng ZhangAbstract:The flow characteristics of the blade unit of a tridimensional rotational flow Sieve Tray was investigated experimentally in this study. First, the flow patterns are defined under different liquid arrangement methods. They are bilateral film flow, continuous perforated flow, and dispersion-mixing flow in overflow distribution and film and jet flow and jet and mixed flow in spray distribution. Second, the time and frequency domain analysis of the differential pressure pulsation signal in the blade unit is carried out. The influence of perforation and mixing intensity on the flow pattern transition is clarified. Third, the rotational flow ratio of the gas-liquid phase is measured. The influence of the operating conditions on the distribution of the rotational and perforated flow for the gas-liquid phase is investigated. Finally, a prediction model for the rotational flow ratio is proposed. The prediction results agree well with the experimental data.
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cfd simulation of gas flow field distribution and design optimization of the tridimensional rotational flow Sieve Tray with different structural parameters
Chemical Engineering Science, 2019Co-Authors: Meng Tang, Dewu Wang, Yishuo Zhang, Shaofeng Zhang, Lusha WangAbstract:Abstract Using CFD simulation, we first investigated the flow field distribution of the tridimensional rotational flow Sieve Tray (TRST) under different structural parameters (i.e. number of the blades, twist angle of the blades, Tray height and Sieve hole diameter) and installation methods (forward and backward) when gas flows downward through the TRST. Secondly, we carried out a comparative study of three modified structures of the Tray, i.e. no supporting ring, a closed internal cylinder and no Sieve holes present. Finally, we studied the transformed situations of the rotational flow and propose a dimensionless correlation to evaluate the performance of the Tray. The results show that, apart from the Tray with a smaller twist angle of the blade, the gas flow field distributions for all the other types of Trays are similar. When two Trays are installed, the gas flow field of the second Tray in a forward installation is obviously different to that of a backward installation. The transformed position of the rotational flow for most types of Trays is about half the depth of the Tray. After comprehensive evaluation, the optimized Tray structures are identified as a configuration with 8 blades, a 90° twist angle of the blades, a Tray height of 40 mm, and Sieve holes of 5 mm diameter. In addition, the Tray should have open internal cylinder without a supporting ring. When a multi-Tray is installed, the backward installation method should be adopted.
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cfd simulation and experimental study of dry pressure drop and gas flow distribution of the tridimensional rotational flow Sieve Tray
Chemical Engineering Research & Design, 2017Co-Authors: Meng Tang, Dewu Wang, Shaofeng Zhang, Yishuo ZhangAbstract:Abstract A novel column internal was proposed, named tridimensional rotational flow Sieve Tray(TRST). Using CFD simulation and experimental methods, we examined the dry pressure drop and gas flow distribution when gas flows downward through the TRST. The results indicate that compared with other common Trays, the dry pressure drop of TRST is lower (less than 70 Pa). In the TRST, there are two kinds of gas flows: one is the rotational flow between the adjacent two twisted Sieve blades, the other is the flow through perforations at the Sieve holes. They are coupled with each other. Subjected to diversion and restriction from the twisted Sieve blades, in the upper part of the Tray, the gas is at the stage of starting rotational flow, the velocity is lower and the static pressure is larger, both the forward and backward flow through perforations exist; in the middle and lower part of the Tray, the gas is at the stage of full developed rotational flow, the velocity is larger, the static pressure is lower and the flow through perforations of gas is all in forward.