The Experts below are selected from a list of 1266 Experts worldwide ranked by ideXlab platform
Shiqiu Gao - One of the best experts on this subject based on the ideXlab platform.
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saturation carrying capacity at high Archimedes Number of vertical concurrent gas particle flow
Chemical Engineering Science, 2006Co-Authors: Ernstulrich Hartge, Joachim Werther, Shiqiu GaoAbstract:The existing literature data on the saturation carrying capacity G(S)* for vertical concurrent gas-particle flow are limited to Archimedes Numbers Ar below 1000. By experimental measurement and dimensionless analysis the present article extended Ar to 2500 to demonstrate how G(S)* varies with gas velocity under these high Ar values. The obtained result revealed that G(S)* is subject to the same kind of correlation with as velocity irrespective of Ar. The degree that G(S)* depends on gas velocity, however, generally decreases with raising Ar and it tends to be a constant when Ar becomes higher than 530. This shows in fact that the flows with heavy/large particles or dense/viscous gas possess a low increase in particle-carrying capability with increasing gas velocity until a steady specific capability per m/s is reached at Ar of 530. The article also reanalyzed the influence of column diameter on G(S)*, demonstrating that the column diameter influence exists only in small columns and for flows with heavy/large particles. The influence is negligible in commercial conveying columns and differs according to Ar in those small columns employed in laboratory studies. All of these findings resulted in an upgraded correlation for G(S)*, which manifested not only wide applicability to flows in differently sized columns and with Ar of up to 2500 but also better accuracy in the mentioned flow conditions when comparing with several other literature correlations. (c) 2006 Elsevier Ltd. All rights reserved.
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Saturation carrying capacity at high Archimedes Number of vertical concurrent gas–particle flow
Chemical Engineering Science, 2006Co-Authors: Ernstulrich Hartge, Joachim Werther, Shiqiu GaoAbstract:The existing literature data on the saturation carrying capacity G(S)* for vertical concurrent gas-particle flow are limited to Archimedes Numbers Ar below 1000. By experimental measurement and dimensionless analysis the present article extended Ar to 2500 to demonstrate how G(S)* varies with gas velocity under these high Ar values. The obtained result revealed that G(S)* is subject to the same kind of correlation with as velocity irrespective of Ar. The degree that G(S)* depends on gas velocity, however, generally decreases with raising Ar and it tends to be a constant when Ar becomes higher than 530. This shows in fact that the flows with heavy/large particles or dense/viscous gas possess a low increase in particle-carrying capability with increasing gas velocity until a steady specific capability per m/s is reached at Ar of 530. The article also reanalyzed the influence of column diameter on G(S)*, demonstrating that the column diameter influence exists only in small columns and for flows with heavy/large particles. The influence is negligible in commercial conveying columns and differs according to Ar in those small columns employed in laboratory studies. All of these findings resulted in an upgraded correlation for G(S)*, which manifested not only wide applicability to flows in differently sized columns and with Ar of up to 2500 but also better accuracy in the mentioned flow conditions when comparing with several other literature correlations. (c) 2006 Elsevier Ltd. All rights reserved.
Ernstulrich Hartge - One of the best experts on this subject based on the ideXlab platform.
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saturation carrying capacity at high Archimedes Number of vertical concurrent gas particle flow
Chemical Engineering Science, 2006Co-Authors: Ernstulrich Hartge, Joachim Werther, Shiqiu GaoAbstract:The existing literature data on the saturation carrying capacity G(S)* for vertical concurrent gas-particle flow are limited to Archimedes Numbers Ar below 1000. By experimental measurement and dimensionless analysis the present article extended Ar to 2500 to demonstrate how G(S)* varies with gas velocity under these high Ar values. The obtained result revealed that G(S)* is subject to the same kind of correlation with as velocity irrespective of Ar. The degree that G(S)* depends on gas velocity, however, generally decreases with raising Ar and it tends to be a constant when Ar becomes higher than 530. This shows in fact that the flows with heavy/large particles or dense/viscous gas possess a low increase in particle-carrying capability with increasing gas velocity until a steady specific capability per m/s is reached at Ar of 530. The article also reanalyzed the influence of column diameter on G(S)*, demonstrating that the column diameter influence exists only in small columns and for flows with heavy/large particles. The influence is negligible in commercial conveying columns and differs according to Ar in those small columns employed in laboratory studies. All of these findings resulted in an upgraded correlation for G(S)*, which manifested not only wide applicability to flows in differently sized columns and with Ar of up to 2500 but also better accuracy in the mentioned flow conditions when comparing with several other literature correlations. (c) 2006 Elsevier Ltd. All rights reserved.
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Saturation carrying capacity at high Archimedes Number of vertical concurrent gas–particle flow
Chemical Engineering Science, 2006Co-Authors: Ernstulrich Hartge, Joachim Werther, Shiqiu GaoAbstract:The existing literature data on the saturation carrying capacity G(S)* for vertical concurrent gas-particle flow are limited to Archimedes Numbers Ar below 1000. By experimental measurement and dimensionless analysis the present article extended Ar to 2500 to demonstrate how G(S)* varies with gas velocity under these high Ar values. The obtained result revealed that G(S)* is subject to the same kind of correlation with as velocity irrespective of Ar. The degree that G(S)* depends on gas velocity, however, generally decreases with raising Ar and it tends to be a constant when Ar becomes higher than 530. This shows in fact that the flows with heavy/large particles or dense/viscous gas possess a low increase in particle-carrying capability with increasing gas velocity until a steady specific capability per m/s is reached at Ar of 530. The article also reanalyzed the influence of column diameter on G(S)*, demonstrating that the column diameter influence exists only in small columns and for flows with heavy/large particles. The influence is negligible in commercial conveying columns and differs according to Ar in those small columns employed in laboratory studies. All of these findings resulted in an upgraded correlation for G(S)*, which manifested not only wide applicability to flows in differently sized columns and with Ar of up to 2500 but also better accuracy in the mentioned flow conditions when comparing with several other literature correlations. (c) 2006 Elsevier Ltd. All rights reserved.
Joachim Werther - One of the best experts on this subject based on the ideXlab platform.
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saturation carrying capacity at high Archimedes Number of vertical concurrent gas particle flow
Chemical Engineering Science, 2006Co-Authors: Ernstulrich Hartge, Joachim Werther, Shiqiu GaoAbstract:The existing literature data on the saturation carrying capacity G(S)* for vertical concurrent gas-particle flow are limited to Archimedes Numbers Ar below 1000. By experimental measurement and dimensionless analysis the present article extended Ar to 2500 to demonstrate how G(S)* varies with gas velocity under these high Ar values. The obtained result revealed that G(S)* is subject to the same kind of correlation with as velocity irrespective of Ar. The degree that G(S)* depends on gas velocity, however, generally decreases with raising Ar and it tends to be a constant when Ar becomes higher than 530. This shows in fact that the flows with heavy/large particles or dense/viscous gas possess a low increase in particle-carrying capability with increasing gas velocity until a steady specific capability per m/s is reached at Ar of 530. The article also reanalyzed the influence of column diameter on G(S)*, demonstrating that the column diameter influence exists only in small columns and for flows with heavy/large particles. The influence is negligible in commercial conveying columns and differs according to Ar in those small columns employed in laboratory studies. All of these findings resulted in an upgraded correlation for G(S)*, which manifested not only wide applicability to flows in differently sized columns and with Ar of up to 2500 but also better accuracy in the mentioned flow conditions when comparing with several other literature correlations. (c) 2006 Elsevier Ltd. All rights reserved.
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Saturation carrying capacity at high Archimedes Number of vertical concurrent gas–particle flow
Chemical Engineering Science, 2006Co-Authors: Ernstulrich Hartge, Joachim Werther, Shiqiu GaoAbstract:The existing literature data on the saturation carrying capacity G(S)* for vertical concurrent gas-particle flow are limited to Archimedes Numbers Ar below 1000. By experimental measurement and dimensionless analysis the present article extended Ar to 2500 to demonstrate how G(S)* varies with gas velocity under these high Ar values. The obtained result revealed that G(S)* is subject to the same kind of correlation with as velocity irrespective of Ar. The degree that G(S)* depends on gas velocity, however, generally decreases with raising Ar and it tends to be a constant when Ar becomes higher than 530. This shows in fact that the flows with heavy/large particles or dense/viscous gas possess a low increase in particle-carrying capability with increasing gas velocity until a steady specific capability per m/s is reached at Ar of 530. The article also reanalyzed the influence of column diameter on G(S)*, demonstrating that the column diameter influence exists only in small columns and for flows with heavy/large particles. The influence is negligible in commercial conveying columns and differs according to Ar in those small columns employed in laboratory studies. All of these findings resulted in an upgraded correlation for G(S)*, which manifested not only wide applicability to flows in differently sized columns and with Ar of up to 2500 but also better accuracy in the mentioned flow conditions when comparing with several other literature correlations. (c) 2006 Elsevier Ltd. All rights reserved.
Anne Sophie Hansen - One of the best experts on this subject based on the ideXlab platform.
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investigation of the displacement effect of a diffuse ceiling ventilation system
Energy and Buildings, 2014Co-Authors: Steffen Petersen, Niels Uhre Christensen, Caroline Heinsen, Anne Sophie HansenAbstract:Abstract This paper reports on an experimental and analytical investigation on the potential displacement effect of a diffuse ceiling ventilation system. Experimental data was generated in a test chamber where measurements of four test series were conducted for two different placements of the exhaust. Furthermore, CFD calculations were performed to support the analysis of the experimental results. The results show that tendencies known from conventional displacement ventilation occur at low heat loads and a development towards full mixing with increasing heat load. It has been demonstrated that the vertical air velocity profiles, temperature distribution and ventilation effectiveness are independent of the Archimedes Number.
Chang Keun Yi - One of the best experts on this subject based on the ideXlab platform.
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Type transition in onset condition of turbulent fluidization
Korean Journal of Chemical Engineering, 2011Co-Authors: Jeong-hoo Choi, Chang Keun YiAbstract:The type transition in onset condition of turbulent fluidization in gas fluidized beds was investigated to obtain the relation representing more precise roles of physical properties of gas and solid particles. The type transition in onset condition of turbulent fluidization occurs at Archimedes Number of 20.87 by type transition of bubble breakup. The maximum stable bubble diameter (d_ bmax ) is greater than the equilibrium bubble diameter (d_ beq ) in the region, Ar< 20.87, but d_beq>d_ bmax in the region, Ar>20.87. Therefore, the onset of turbulent fluidization is determined in the region, Ar20.87, by d_ bmax as the limit of bubble growth. The uc decreases in the region, Ar20.87 as temperature increases.
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Type transition in onset condition of turbulent fluidization
Korean Journal of Chemical Engineering, 2011Co-Authors: Jeong-hoo Choi, Chang Keun YiAbstract:The type transition in onset condition of turbulent fluidization in gas fluidized beds was investigated to obtain the relation representing more precise roles of physical properties of gas and solid particles. The type transition in onset condition of turbulent fluidization occurs at Archimedes Number of 20.87 by type transition of bubble breakup. The maximum stable bubble diameter (d bmax ) is greater than the equilibrium bubble diameter (d beq ) in the region, Ar d bmax in the region, Ar>20.87. Therefore, the onset of turbulent fluidization is determined in the region, Ar 20.87, by d bmax as the limit of bubble growth. The uc decreases in the region, Ar 20.87 as temperature increases.
