The Reynolds stress transport model and the Eulerian two-fluid model provided by the FLUENT code were applied to evaluate the gas-particle two-phase flow in the ceramic filter vessel. The ceramic filter vessel contain...The Reynolds stress transport model and the Eulerian two-fluid model provided by the FLUENT code were applied to evaluate the gas-particle two-phase flow in the ceramic filter vessel. The ceramic filter vessel contains six candle filters, which are arranged in the form of equilateral hexagon. The variation of the areal density of the filter cake during the filtration and the back-pulse process were analyzed. The coupling effect between filters, gas and solid, filtration and pulse cleaning process were investigated, respectively. The numerical results show a good approach to predict the particle distribution in the vessel and the particle deposition on the filter element. This study provides the base for the intensive study on the analysis of the gas-particle flow in the filter vessel.展开更多
Fast and accurate extraction of vascular structures from medical images is fundamental for many clinical procedures.However,most of the vessel segmentation techniques ignore the existence of the isolated and redundant...Fast and accurate extraction of vascular structures from medical images is fundamental for many clinical procedures.However,most of the vessel segmentation techniques ignore the existence of the isolated and redundant points in the segmentation results.In this study,we propose a vascular segmentation method based on a prior shape and local statistics.It could efficiently eliminate outliers and accurately segment thick and thin vessels.First,an improved vesselness filter is defined.This quantifies the likelihood of each voxel belonging to a bright tubular-shaped structure.A matching and connection process is then performed to obtain a blood-vessel mask.Finally,the region-growing method based on local statistics is implemented on the vessel mask to obtain the whole vascular tree without outliers.Experiments and comparisons with Frangi’s and Yang’s models on real magneticresonance-angiography images demonstrate that the proposed method can remove outliers while preserving the connectivity of vessel branches.展开更多
基金the National High Technology Research and Development Program of China(2007AA03Z524)
文摘The Reynolds stress transport model and the Eulerian two-fluid model provided by the FLUENT code were applied to evaluate the gas-particle two-phase flow in the ceramic filter vessel. The ceramic filter vessel contains six candle filters, which are arranged in the form of equilateral hexagon. The variation of the areal density of the filter cake during the filtration and the back-pulse process were analyzed. The coupling effect between filters, gas and solid, filtration and pulse cleaning process were investigated, respectively. The numerical results show a good approach to predict the particle distribution in the vessel and the particle deposition on the filter element. This study provides the base for the intensive study on the analysis of the gas-particle flow in the filter vessel.
基金Project supported by the National Natural Science Foundation of China(Nos.61472042 and 61802020)the Beijing Natural Science Foundation,China(No.4174094)the Fundamental Research Funds for the Central Universities,China(No.2015KJJCB25)
文摘Fast and accurate extraction of vascular structures from medical images is fundamental for many clinical procedures.However,most of the vessel segmentation techniques ignore the existence of the isolated and redundant points in the segmentation results.In this study,we propose a vascular segmentation method based on a prior shape and local statistics.It could efficiently eliminate outliers and accurately segment thick and thin vessels.First,an improved vesselness filter is defined.This quantifies the likelihood of each voxel belonging to a bright tubular-shaped structure.A matching and connection process is then performed to obtain a blood-vessel mask.Finally,the region-growing method based on local statistics is implemented on the vessel mask to obtain the whole vascular tree without outliers.Experiments and comparisons with Frangi’s and Yang’s models on real magneticresonance-angiography images demonstrate that the proposed method can remove outliers while preserving the connectivity of vessel branches.
