The Experts below are selected from a list of 219 Experts worldwide ranked by ideXlab platform
Norio Saitoh - One of the best experts on this subject based on the ideXlab platform.
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pressure dependence of acetophenone n n n n tetramethylbenzidine exciplex in supercritical carbon dioxide
Chemical Physics Letters, 2002Co-Authors: Takafumi Aizawa, Siriporn Janttarakeeree, Yutaka Ikushima, Norio SaitohAbstract:Abstract The pressure dependence of the formation and decay processes of exciplex between two neutral species acetophenone (AP) and N , N , N ′ , N ′ -tetramethylbenzidine (TMB) in supercritical carbon dioxide was investigated by a transient absorption technique at 40 °C and at pressures from 9.0 to 14.7 MPa. The exciplex formation rate constant could be described by the Stokes–Einstein/Debye (SE/D) equation. The trend of the exciplex decay rate constant showed local density augmentation around the exciplex in the Low-Pressure Region.
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Pressure dependence of acetophenone N,N,N′,N′-tetramethylbenzidine exciplex in supercritical carbon dioxide
Chemical Physics Letters, 2002Co-Authors: Takafumi Aizawa, Siriporn Janttarakeeree, Yutaka Ikushima, Norio SaitohAbstract:Abstract The pressure dependence of the formation and decay processes of exciplex between two neutral species acetophenone (AP) and N , N , N ′ , N ′ -tetramethylbenzidine (TMB) in supercritical carbon dioxide was investigated by a transient absorption technique at 40 °C and at pressures from 9.0 to 14.7 MPa. The exciplex formation rate constant could be described by the Stokes–Einstein/Debye (SE/D) equation. The trend of the exciplex decay rate constant showed local density augmentation around the exciplex in the Low-Pressure Region.
Takafumi Aizawa - One of the best experts on this subject based on the ideXlab platform.
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pressure dependence of acetophenone n n n n tetramethylbenzidine exciplex in supercritical carbon dioxide
Chemical Physics Letters, 2002Co-Authors: Takafumi Aizawa, Siriporn Janttarakeeree, Yutaka Ikushima, Norio SaitohAbstract:Abstract The pressure dependence of the formation and decay processes of exciplex between two neutral species acetophenone (AP) and N , N , N ′ , N ′ -tetramethylbenzidine (TMB) in supercritical carbon dioxide was investigated by a transient absorption technique at 40 °C and at pressures from 9.0 to 14.7 MPa. The exciplex formation rate constant could be described by the Stokes–Einstein/Debye (SE/D) equation. The trend of the exciplex decay rate constant showed local density augmentation around the exciplex in the Low-Pressure Region.
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Pressure dependence of acetophenone N,N,N′,N′-tetramethylbenzidine exciplex in supercritical carbon dioxide
Chemical Physics Letters, 2002Co-Authors: Takafumi Aizawa, Siriporn Janttarakeeree, Yutaka Ikushima, Norio SaitohAbstract:Abstract The pressure dependence of the formation and decay processes of exciplex between two neutral species acetophenone (AP) and N , N , N ′ , N ′ -tetramethylbenzidine (TMB) in supercritical carbon dioxide was investigated by a transient absorption technique at 40 °C and at pressures from 9.0 to 14.7 MPa. The exciplex formation rate constant could be described by the Stokes–Einstein/Debye (SE/D) equation. The trend of the exciplex decay rate constant showed local density augmentation around the exciplex in the Low-Pressure Region.
Siriporn Janttarakeeree - One of the best experts on this subject based on the ideXlab platform.
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pressure dependence of acetophenone n n n n tetramethylbenzidine exciplex in supercritical carbon dioxide
Chemical Physics Letters, 2002Co-Authors: Takafumi Aizawa, Siriporn Janttarakeeree, Yutaka Ikushima, Norio SaitohAbstract:Abstract The pressure dependence of the formation and decay processes of exciplex between two neutral species acetophenone (AP) and N , N , N ′ , N ′ -tetramethylbenzidine (TMB) in supercritical carbon dioxide was investigated by a transient absorption technique at 40 °C and at pressures from 9.0 to 14.7 MPa. The exciplex formation rate constant could be described by the Stokes–Einstein/Debye (SE/D) equation. The trend of the exciplex decay rate constant showed local density augmentation around the exciplex in the Low-Pressure Region.
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Pressure dependence of acetophenone N,N,N′,N′-tetramethylbenzidine exciplex in supercritical carbon dioxide
Chemical Physics Letters, 2002Co-Authors: Takafumi Aizawa, Siriporn Janttarakeeree, Yutaka Ikushima, Norio SaitohAbstract:Abstract The pressure dependence of the formation and decay processes of exciplex between two neutral species acetophenone (AP) and N , N , N ′ , N ′ -tetramethylbenzidine (TMB) in supercritical carbon dioxide was investigated by a transient absorption technique at 40 °C and at pressures from 9.0 to 14.7 MPa. The exciplex formation rate constant could be described by the Stokes–Einstein/Debye (SE/D) equation. The trend of the exciplex decay rate constant showed local density augmentation around the exciplex in the Low-Pressure Region.
Yutaka Ikushima - One of the best experts on this subject based on the ideXlab platform.
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pressure dependence of acetophenone n n n n tetramethylbenzidine exciplex in supercritical carbon dioxide
Chemical Physics Letters, 2002Co-Authors: Takafumi Aizawa, Siriporn Janttarakeeree, Yutaka Ikushima, Norio SaitohAbstract:Abstract The pressure dependence of the formation and decay processes of exciplex between two neutral species acetophenone (AP) and N , N , N ′ , N ′ -tetramethylbenzidine (TMB) in supercritical carbon dioxide was investigated by a transient absorption technique at 40 °C and at pressures from 9.0 to 14.7 MPa. The exciplex formation rate constant could be described by the Stokes–Einstein/Debye (SE/D) equation. The trend of the exciplex decay rate constant showed local density augmentation around the exciplex in the Low-Pressure Region.
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Pressure dependence of acetophenone N,N,N′,N′-tetramethylbenzidine exciplex in supercritical carbon dioxide
Chemical Physics Letters, 2002Co-Authors: Takafumi Aizawa, Siriporn Janttarakeeree, Yutaka Ikushima, Norio SaitohAbstract:Abstract The pressure dependence of the formation and decay processes of exciplex between two neutral species acetophenone (AP) and N , N , N ′ , N ′ -tetramethylbenzidine (TMB) in supercritical carbon dioxide was investigated by a transient absorption technique at 40 °C and at pressures from 9.0 to 14.7 MPa. The exciplex formation rate constant could be described by the Stokes–Einstein/Debye (SE/D) equation. The trend of the exciplex decay rate constant showed local density augmentation around the exciplex in the Low-Pressure Region.
Satoshi Gunjishima - One of the best experts on this subject based on the ideXlab platform.
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An Explanation for Flow Features of Spike-Type Stall Inception in an Axial Compressor Rotor
Journal of Turbomachinery-transactions of The Asme, 2012Co-Authors: Kazutoyo Yamada, Hiroaki Kikuta, Kenichiro Ken-ichiro Iwakiri, Masato Furukawa, Satoshi GunjishimaAbstract:The unsteady behavior and three-dimensional flow structure of spike-type stall inception in an axial compressor rotor were investigated by experimental and numerical analyses. Previous studies revealed that the test compressor falls into a mild stall after emergence of a spike, in which multiple stall cells, each consisting of a tornado-like vortex, are rotating. However, the flow mechanism from the spike onset to the mild stall remains unexplained. The purpose of this study is to describe the flow mechanism of a spike stall inception in a compressor. In order to capture the transient phenomena of spike-type stall inception experimentally, an instantaneous casing pressure field measurement technique was developed, in which 30 pressure transducers measure an instantaneous casing pressure distribution inside the passage for one blade pitch at a rate of 25 samplings per blade passing period. This technique was applied to obtain the unsteady and transient pressure fields on the casing wall during the inception process of the spike stall. In addition, the details of the three-dimensional flow structure at the spike stall inception were analyzed by a numerical approach using the detached-eddy simulation (DES). The instantaneous casing pressure field measurement results at the stall inception show that a Low-Pressure Region starts traveling near the leading edge in the circumferential direction just after the spiky wave was detected in the casing wall pressure trace measured near the rotor leading edge. The DES results reveal the vortical flow structure behind the Low-Pressure Region on the casing wall at the stall inception, showing that the Low-Pressure Region is caused by a tornado-like separation vortex resulting from a leading-edge separation near the rotor tip. A leading-edge separation occurs near the tip at the onset of the spike stall and grows to form the tornado-like vortex connecting the blade suction surface and the casing wall. The casing-side leg of the tornado-like vortex generating the Low-Pressure Region circumferentially moves around the leading-edge line. When the vortex grows large enough to interact with the leading edge of the next blade, the leading-edge separation begins to propagate, and then the compressor falls into a stall with decreasing performance.
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An explanation for flow features of spike-type stall inception in an axial compressor rotor
Volume 8: Turbomachinery Parts A B and C, 2012Co-Authors: Kazutoyo Yamada, Hiroaki Kikuta, Kenichiro Ken-ichiro Iwakiri, Masato Furukawa, Satoshi GunjishimaAbstract:The unsteady behavior and three-dimensional flow structure of spike-type stall inception in an axial compressor rotor have been investigated by experimental and numerical analyses. Previous studies have revealed that the test compressor falls into a mild stall after emergence of a spike, in which multiple stall cells, each consisting of a tornado-like vortex, are rotating. However, the flow mechanism from the spike onset to the mild stall remains unexplained. The purpose of this study is to describe the flow mechanism of a spike stall inception in a compressor. In order to capture the transient phenomena of spike-type stall inception experimentally, an instantaneous casing pressure field measurement technique was developed, in which 30 pressure transducers measure an instantaneous casing pressure distribution inside the passage for one blade pitch at a rate of 25 samplings per blade passing period. This technique was applied to obtain the unsteady and transient pressure fields on the casing wall during the inception process of the spike stall. In addition, the details of the three-dimensional flow structure at the spike stall inception have been analyzed by a numerical approach using the detached-eddy simulation (DES). The instantaneous casing pressure field measurement results at the stall inception show that a Low-Pressure Region starts traveling near the leading edge in the circumferential direction just after the spiky wave was detected in the casing wall pressure trace measured near the rotor leading edge. The DES results reveal the vortical flow structure behind the Low-Pressure Region on the casing wall at the stall inception, showing that the Low-Pressure Region is caused by a tornado-like separation vortex resulting from a leading-edge separation near the rotor tip. A leading-edge separation occurs near the tip at the onset of the spike stall and grows to form the tornado-like vortex connecting the blade suction surface and the casing wall. The casing-side leg of the tornado-like vortex generating the Low-Pressure Region circumferentially moves around the leading-edge line. When the vortex grows large enough to interact with the leading edge of the next blade, the leading-edge separation begins to propagate, and then, the compressor falls into a stall with decreasing performance.