The Experts below are selected from a list of 1341 Experts worldwide ranked by ideXlab platform
Hongbing Ding - One of the best experts on this subject based on the ideXlab platform.
-
measurement of vortex Flowmeter using tri axis acceleration probe based on multi parameter adjustable Mist Flow loop
The Journal of Thoracic and Cardiovascular Surgery, 2020Co-Authors: Hongjun Sun, Wenqiang Zhang, Hongbing DingAbstract:To study the measurement characteristics of vortex Flowmeter in Mist Flow, a multi-parameter adjustable control system based on the Mist Flow loop was developed to provide stable and various experimental conditions. A film extraction device was developed to remove the deposited liquid film and measure the film Flow rate. Then, a probe based on three-axis accelerometer was developed to acquire the vortex signal. The calibration experiments in dry gas and the signal analysis on various Mist Flow conditions were carried out. Finally, the over-reading (OR) of the gas Flow rate and the signal amplitude were analyzed in detail. The results indicate that the single-phase measurement accuracy of the acceleration probe is within ± 1%, and the amplitude shows a quadratic function relationship with the Flow rate. In Mist Flow, OR increases with the increase of the droplet loading, and the amplitude decreases.
-
I2MTC - Measurement of vortex Flowmeter using tri-axis acceleration probe based on multi-parameter adjustable Mist Flow loop
2020 IEEE International Instrumentation and Measurement Technology Conference (I2MTC), 2020Co-Authors: Hongjun Sun, Wenqiang Zhang, Hongbing DingAbstract:To study the measurement characteristics of vortex Flowmeter in Mist Flow, a multi-parameter adjustable control system based on the Mist Flow loop was developed to provide stable and various experimental conditions. A film extraction device was developed to remove the deposited liquid film and measure the film Flow rate. Then, a probe based on three-axis accelerometer was developed to acquire the vortex signal. The calibration experiments in dry gas and the signal analysis on various Mist Flow conditions were carried out. Finally, the over-reading (OR) of the gas Flow rate and the signal amplitude were analyzed in detail. The results indicate that the single-phase measurement accuracy of the acceleration probe is within ± 1%, and the amplitude shows a quadratic function relationship with the Flow rate. In Mist Flow, OR increases with the increase of the droplet loading, and the amplitude decreases.
-
I2MTC - Signal analysis of vortex Flow field in Mist Flow using transient pressure sensor array
The Journal of Thoracic and Cardiovascular Surgery, 2019Co-Authors: Hongjun Sun, Hongbing DingAbstract:The vortex Flowmeter can be used to measure the Flowrate of wet gas Mist Flow. In order to analyze the characteristics of vortex Flowmeter in wet gas Mist Flow, the transient pressure sensor array was utilized to acquire the signal of near-wall vortex Flow field. The amplitude-frequency response characteristics of the probe–transducer systems were analyzed to ensure the transient pressure measurement accuracy. Then, experiments were carried out on the Mist Flow facility, and vortex field signals were obtained by the sensor array. The signal’s amplitudes on different pressure-sampling positions were compared and the signal qualities on different liquid mass loadings were analyzed by correlation measurement. What’s more, the convection velocity of vortex core was measured by the cross-correlation method. The results indicated that the signal quality deteriorates greatly with the increase of liquid mass loading, and the convection velocity of vortex core in Mist Flow is obviously lower than that of the single gas condition.
-
signal analysis of vortex Flow field in Mist Flow using transient pressure sensor array
The Journal of Thoracic and Cardiovascular Surgery, 2019Co-Authors: Hongjun Sun, Hongbing DingAbstract:The vortex Flowmeter can be used to measure the Flowrate of wet gas Mist Flow. In order to analyze the characteristics of vortex Flowmeter in wet gas Mist Flow, the transient pressure sensor array was utilized to acquire the signal of near-wall vortex Flow field. The amplitude-frequency response characteristics of the probe–transducer systems were analyzed to ensure the transient pressure measurement accuracy. Then, experiments were carried out on the Mist Flow facility, and vortex field signals were obtained by the sensor array. The signal’s amplitudes on different pressure-sampling positions were compared and the signal qualities on different liquid mass loadings were analyzed by correlation measurement. What’s more, the convection velocity of vortex core was measured by the cross-correlation method. The results indicated that the signal quality deteriorates greatly with the increase of liquid mass loading, and the convection velocity of vortex core in Mist Flow is obviously lower than that of the single gas condition.
-
Characteristics of vortex Flowmeter in vapor-liquid Mist Flow
2018 IEEE International Instrumentation and Measurement Technology Conference (I2MTC), 2018Co-Authors: Jinxia Li, Chao Wang, Hongbing DingAbstract:To improve the measurement accuracy of vortex Flowmeter in Mist Flow of wet steam, the meter over-reading of vapor Flowrate was investigated. Four general impact factors for dimensionless vortex frequency, namely Strouhal number, were obtained by dimensional analysis. A two-fluid model using Eulerian-Eulerian method was established and validated by the experiments. Then, the unsteady numerical simulations for Mist Flow around a bluff body were conducted, which indicated that the over-reading is dominantly affected by droplet mass loading and dimensionless droplet diameter. Moreover, the over-reading of vapor Flowrate will increase with droplet mass loading, and its growth rate is negatively related with droplet diameter.
Hongjun Sun - One of the best experts on this subject based on the ideXlab platform.
-
measurement of vortex Flowmeter using tri axis acceleration probe based on multi parameter adjustable Mist Flow loop
The Journal of Thoracic and Cardiovascular Surgery, 2020Co-Authors: Hongjun Sun, Wenqiang Zhang, Hongbing DingAbstract:To study the measurement characteristics of vortex Flowmeter in Mist Flow, a multi-parameter adjustable control system based on the Mist Flow loop was developed to provide stable and various experimental conditions. A film extraction device was developed to remove the deposited liquid film and measure the film Flow rate. Then, a probe based on three-axis accelerometer was developed to acquire the vortex signal. The calibration experiments in dry gas and the signal analysis on various Mist Flow conditions were carried out. Finally, the over-reading (OR) of the gas Flow rate and the signal amplitude were analyzed in detail. The results indicate that the single-phase measurement accuracy of the acceleration probe is within ± 1%, and the amplitude shows a quadratic function relationship with the Flow rate. In Mist Flow, OR increases with the increase of the droplet loading, and the amplitude decreases.
-
I2MTC - Measurement of vortex Flowmeter using tri-axis acceleration probe based on multi-parameter adjustable Mist Flow loop
2020 IEEE International Instrumentation and Measurement Technology Conference (I2MTC), 2020Co-Authors: Hongjun Sun, Wenqiang Zhang, Hongbing DingAbstract:To study the measurement characteristics of vortex Flowmeter in Mist Flow, a multi-parameter adjustable control system based on the Mist Flow loop was developed to provide stable and various experimental conditions. A film extraction device was developed to remove the deposited liquid film and measure the film Flow rate. Then, a probe based on three-axis accelerometer was developed to acquire the vortex signal. The calibration experiments in dry gas and the signal analysis on various Mist Flow conditions were carried out. Finally, the over-reading (OR) of the gas Flow rate and the signal amplitude were analyzed in detail. The results indicate that the single-phase measurement accuracy of the acceleration probe is within ± 1%, and the amplitude shows a quadratic function relationship with the Flow rate. In Mist Flow, OR increases with the increase of the droplet loading, and the amplitude decreases.
-
I2MTC - Signal analysis of vortex Flow field in Mist Flow using transient pressure sensor array
The Journal of Thoracic and Cardiovascular Surgery, 2019Co-Authors: Hongjun Sun, Hongbing DingAbstract:The vortex Flowmeter can be used to measure the Flowrate of wet gas Mist Flow. In order to analyze the characteristics of vortex Flowmeter in wet gas Mist Flow, the transient pressure sensor array was utilized to acquire the signal of near-wall vortex Flow field. The amplitude-frequency response characteristics of the probe–transducer systems were analyzed to ensure the transient pressure measurement accuracy. Then, experiments were carried out on the Mist Flow facility, and vortex field signals were obtained by the sensor array. The signal’s amplitudes on different pressure-sampling positions were compared and the signal qualities on different liquid mass loadings were analyzed by correlation measurement. What’s more, the convection velocity of vortex core was measured by the cross-correlation method. The results indicated that the signal quality deteriorates greatly with the increase of liquid mass loading, and the convection velocity of vortex core in Mist Flow is obviously lower than that of the single gas condition.
-
signal analysis of vortex Flow field in Mist Flow using transient pressure sensor array
The Journal of Thoracic and Cardiovascular Surgery, 2019Co-Authors: Hongjun Sun, Hongbing DingAbstract:The vortex Flowmeter can be used to measure the Flowrate of wet gas Mist Flow. In order to analyze the characteristics of vortex Flowmeter in wet gas Mist Flow, the transient pressure sensor array was utilized to acquire the signal of near-wall vortex Flow field. The amplitude-frequency response characteristics of the probe–transducer systems were analyzed to ensure the transient pressure measurement accuracy. Then, experiments were carried out on the Mist Flow facility, and vortex field signals were obtained by the sensor array. The signal’s amplitudes on different pressure-sampling positions were compared and the signal qualities on different liquid mass loadings were analyzed by correlation measurement. What’s more, the convection velocity of vortex core was measured by the cross-correlation method. The results indicated that the signal quality deteriorates greatly with the increase of liquid mass loading, and the convection velocity of vortex core in Mist Flow is obviously lower than that of the single gas condition.
Yun Sun - One of the best experts on this subject based on the ideXlab platform.
-
Mist Flow Chemical Vapor Deposition Growth of Thin Single-Wall Carbon Nanotubes Using Fe18 Clusters as the Catalyst Precursor
Nano, 2015Co-Authors: Yun Sun, Takuya NakayamaAbstract:An investigation about the fabrication of thin single-walled carbon nanotubes (SWCNTs) using Fe 18 clusters as the catalyst precursor by means of Mist Flow chemical vapor deposition (CVD) has been carried out. The advantage of Fe 18 clusters is the uniform and small particle size. As a result, choosing the acetonitrile (MeCN), the original solvent for preparing Fe 18 clusters, as the carbon source can lead to the mean diameter of as-grown SWCNTs around 0.81 nm and thinner than some published results (zeolite-supported CVD and HiPco). In addition, according to the measured diameter distribution of as-grown SWCNTs, we are aware that thin SWCNTs less than 1.0 nm are dominant within the as-grown products corresponding to photoluminescence (PL) map indicating that Mist Flow CVD could be another option for the fabrication of thin SWCNTs in a floating CVD system and beneficial for the application of SWCNTs and development of CNT-based semiconducting electronic devices.
-
Metal catalyst-free Mist Flow chemical vapor deposition growth of single-wall carbon nanotubes using C60 colloidal solutions
Carbon, 2014Co-Authors: Yun Sun, Ryo Kitaura, Yasumitsu Miyata, Jinying Zhang, Hisanori ShinoharaAbstract:Abstract Metal catalyst-free Mist Flow chemical vapor deposition (CVD) growth of single-walled carbon nanotubes (SWCNTs) with C 60 fullerenes has been investigated by using an aqueous colloidal C 60 solution. Under the optimum reaction condition, relatively uniform SWCNTs with a mean diameter of 1.28 nm can be synthesized without any treatments of C 60 prior to CVD. Cap opening, nucleation and the growth of SWCNTs have been occurring almost simultaneously during the present CVD. C 60 can be used as the seeds (i.e., end-caps) of SWCNTs, in which oxygen atoms from water molecules provide etching of C 60 into caps. Furthermore, the coalescence of C 60 caps into a larger one leads to the growth of SWCNTs with larger diameters.
-
CONTROLLABLE CHEMICAL VAPOR DEPOSITION SYNTHESIS OF SINGLE-WALL CARBON NANOTUBES USING Mist Flow METHOD
NANO, 2012Co-Authors: Yun Sun, Ryo Kitaura, Takuya Nakayama, Yasumitsu Miyata, Hisanori ShinoharaAbstract:The influences of synthesis parameters on the mean diameter and diameter distribution of as-grown single-wall carbon nanotubes (SWCNTs) with chemical vapor deposition (CVD) using the Mist Flow method have been investigated in detail with Raman spectroscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). We found that CVD reaction temperature and Flow rate play an essential role in controlling the mean diameter and the quality of as-grown SWCNTs. Furthermore, we found that the carbon supply kinetics can be a dominant factor to determine the diameter of as-grown SWCNTs in the present Mist Flow method. Under a different combination of various parameters, the mean diameter of SWCNTs can be varied from 0.9 nm to 1.5 nm controllably.
Takuya Nakayama - One of the best experts on this subject based on the ideXlab platform.
-
Mist Flow Chemical Vapor Deposition Growth of Thin Single-Wall Carbon Nanotubes Using Fe18 Clusters as the Catalyst Precursor
Nano, 2015Co-Authors: Yun Sun, Takuya NakayamaAbstract:An investigation about the fabrication of thin single-walled carbon nanotubes (SWCNTs) using Fe 18 clusters as the catalyst precursor by means of Mist Flow chemical vapor deposition (CVD) has been carried out. The advantage of Fe 18 clusters is the uniform and small particle size. As a result, choosing the acetonitrile (MeCN), the original solvent for preparing Fe 18 clusters, as the carbon source can lead to the mean diameter of as-grown SWCNTs around 0.81 nm and thinner than some published results (zeolite-supported CVD and HiPco). In addition, according to the measured diameter distribution of as-grown SWCNTs, we are aware that thin SWCNTs less than 1.0 nm are dominant within the as-grown products corresponding to photoluminescence (PL) map indicating that Mist Flow CVD could be another option for the fabrication of thin SWCNTs in a floating CVD system and beneficial for the application of SWCNTs and development of CNT-based semiconducting electronic devices.
-
CONTROLLABLE CHEMICAL VAPOR DEPOSITION SYNTHESIS OF SINGLE-WALL CARBON NANOTUBES USING Mist Flow METHOD
NANO, 2012Co-Authors: Yun Sun, Ryo Kitaura, Takuya Nakayama, Yasumitsu Miyata, Hisanori ShinoharaAbstract:The influences of synthesis parameters on the mean diameter and diameter distribution of as-grown single-wall carbon nanotubes (SWCNTs) with chemical vapor deposition (CVD) using the Mist Flow method have been investigated in detail with Raman spectroscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). We found that CVD reaction temperature and Flow rate play an essential role in controlling the mean diameter and the quality of as-grown SWCNTs. Furthermore, we found that the carbon supply kinetics can be a dominant factor to determine the diameter of as-grown SWCNTs in the present Mist Flow method. Under a different combination of various parameters, the mean diameter of SWCNTs can be varied from 0.9 nm to 1.5 nm controllably.
Hisanori Shinohara - One of the best experts on this subject based on the ideXlab platform.
-
Metal catalyst-free Mist Flow chemical vapor deposition growth of single-wall carbon nanotubes using C60 colloidal solutions
Carbon, 2014Co-Authors: Yun Sun, Ryo Kitaura, Yasumitsu Miyata, Jinying Zhang, Hisanori ShinoharaAbstract:Abstract Metal catalyst-free Mist Flow chemical vapor deposition (CVD) growth of single-walled carbon nanotubes (SWCNTs) with C 60 fullerenes has been investigated by using an aqueous colloidal C 60 solution. Under the optimum reaction condition, relatively uniform SWCNTs with a mean diameter of 1.28 nm can be synthesized without any treatments of C 60 prior to CVD. Cap opening, nucleation and the growth of SWCNTs have been occurring almost simultaneously during the present CVD. C 60 can be used as the seeds (i.e., end-caps) of SWCNTs, in which oxygen atoms from water molecules provide etching of C 60 into caps. Furthermore, the coalescence of C 60 caps into a larger one leads to the growth of SWCNTs with larger diameters.
-
CONTROLLABLE CHEMICAL VAPOR DEPOSITION SYNTHESIS OF SINGLE-WALL CARBON NANOTUBES USING Mist Flow METHOD
NANO, 2012Co-Authors: Yun Sun, Ryo Kitaura, Takuya Nakayama, Yasumitsu Miyata, Hisanori ShinoharaAbstract:The influences of synthesis parameters on the mean diameter and diameter distribution of as-grown single-wall carbon nanotubes (SWCNTs) with chemical vapor deposition (CVD) using the Mist Flow method have been investigated in detail with Raman spectroscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). We found that CVD reaction temperature and Flow rate play an essential role in controlling the mean diameter and the quality of as-grown SWCNTs. Furthermore, we found that the carbon supply kinetics can be a dominant factor to determine the diameter of as-grown SWCNTs in the present Mist Flow method. Under a different combination of various parameters, the mean diameter of SWCNTs can be varied from 0.9 nm to 1.5 nm controllably.