Pulsed-jet cleaning is recognized as the most efficient method to regenerate bag dust collectors traditionally used in industrial processes to control the emission of particulates.In this study,non-woven needle felt f...Pulsed-jet cleaning is recognized as the most efficient method to regenerate bag dust collectors traditionally used in industrial processes to control the emission of particulates.In this study,non-woven needle felt filter bags with and without a film coating material have been analyzed considering different geometries(different number N of pairs of pleated filter bag sides)in the frame of dedicated low-pressure pulsed-jet cleaning experiments.The flow structure inside the bag and the response characteristics of its wall have also been analyzed numerically through a computational fluid-dynamics/structural-dynamics(CFD-CSD)unidirectional fluid-solid coupling method.As shown by the experiments,the peak pressure(P_(0))on the wall of the filter bag with N=8 and 12 is higher,which indicates dust can be removed more effectively in these cases.The peak pressure on the wall increases first and then decreases along the direction of the bag length,while the peak pressure of the pleated filter bag with nonwoven needled felt film coating is greater than that without film coating.A comprehensive analysis of the time variation of acceleration,deformation,strain,stress and other factors,has led to the conclusion that the pleated filter bag with N=12 would be the optimal choice.展开更多
Pleated Skirts,an ethnic folk original picture book on Batik,creating intricate patterns on the fabric of Miao costumes with traditional dyeing techniques,this book has woven the intangible cultural heritage of Miao e...Pleated Skirts,an ethnic folk original picture book on Batik,creating intricate patterns on the fabric of Miao costumes with traditional dyeing techniques,this book has woven the intangible cultural heritage of Miao ethnic groups into a lively and interesting fairy tale,presenting young readers with a beautiful world full of folk wisdom,not only boasting boundless imagination but also aligning with traditional cultural values,promoting good and punishing evil,and emphasizing unity and mutual assistance.Adopting Miao batik as the illustration style,the unique blue and white colors and simple painting designs have fully embodied the Miao essence,especially the Danzhai batik,with the features of secondary dyeing popular in the region of west Guizhou Province,enriching the expressiveness of the picture.Additionally,the beauty of lines and blank space in traditional Chinese painting in such a book improves the children's perception of ethnic traditional art and cultivates their diverse acsthetic abilities.Thus,it is of great academic value and practical significance to study the profound connotation of the Miao traditional culture.展开更多
In this study, the three-dimensional physical model of pleated air filtration media was simplified to porous media model, and the calculation parameters of porous media were obtained based on experimental data. The mo...In this study, the three-dimensional physical model of pleated air filtration media was simplified to porous media model, and the calculation parameters of porous media were obtained based on experimental data. The model of V-shaped pleated air filter media is constructed, the height of the media pleat is 50 mm and the pleat thickness is 4 mm, the pleat angle is 3.7°. The Hertz-Mindlin contact model was modified by Johnson Kendall Roberts (JKR) adhesion contact model. The deposition process of particles in media was simulated based on computational fluid dynamics (CFD) theory and discrete element method (DEM). Results show that the CFD–DEM coupling method can be effectively applied to the macro research of pleated air filter media. The particles will form dust layer and dendrite structure on the fiber surface, and the dust layer will affect the subsequent air flow organization, and the dendrite structure will eventually form a “particle wall”. The formation of the “particle wall” will prevent the particles from moving further in the fluid domain, which makes area of pleated angle become the “low efficiency” part about the particle deposition. Compared with area of pleated angle, the particles are concentrated in the opening area and the middle area of the pleated to agglomerate and deposit.展开更多
In response to the limitations of conventional thermal management materials,such as restricted functionality,narrow temperature adaptability,and poor breathability,flexibility,and stretchability,this highlight present...In response to the limitations of conventional thermal management materials,such as restricted functionality,narrow temperature adaptability,and poor breathability,flexibility,and stretchability,this highlight presents a breathable,dual-mode leather-like nanotextile(LNT)with asymmetric pleated photonic microstructures and Janus wettability.This innovative design enables efficient and adaptive personal thermal regulation across a broad temperature range,while significantly improving wearer comfort through optimized moisture management and mechanical compliance.The proposed LNT opens new pathways for developing nextgeneration smart textiles,showing great potential for real-world applications in dynamic and demanding environments.展开更多
Due to the advantages of a large filtration area,elongated filter cartridges are gradually replacing filter bags in dust collectors.However,the production standards for these filter cartridges lack clarity in determin...Due to the advantages of a large filtration area,elongated filter cartridges are gradually replacing filter bags in dust collectors.However,the production standards for these filter cartridges lack clarity in determining various parameters.Therefore,this paper combines experimental validation with computational fluid dynamics simulations to analyze the resistance characteristics of elongated filter cartridges,aiming to establish recommended parameter combinations for their optimal design.Single factor analysis and Response Surface Methodology(RSM)are employed for parameter optimization.The study establishes a quadratic regression model to predict resistance based on various filter cartridge parameters.Single factor analysis indicates that the optimal combination of length and pleat number is approximately diagonally distributed.The RSM ranks the factors’impacts on resistance as follows:length(L)>pleat number(N)≈pleat length(Pl)>filtering velocity(v_(f))>outer radius(R).The optimal parameter combination under global optimization is:N=43,P_(l)=23 mm,R=76 mm,L=2 m.Additionally,the study analyzes the distribution of normal and tangential velocities of airflow on the filter medium surface to understand their impact on filter lifespan.Results indicate that tangential velocity has a significant impact on filter wear,and locations with higher tangential velocity are situated in the bottom region of the fold at the outlet.展开更多
基金This study was financially supported by Anhui Provincial Scientific and Technological Major Project(Grant No.18030801109).
文摘Pulsed-jet cleaning is recognized as the most efficient method to regenerate bag dust collectors traditionally used in industrial processes to control the emission of particulates.In this study,non-woven needle felt filter bags with and without a film coating material have been analyzed considering different geometries(different number N of pairs of pleated filter bag sides)in the frame of dedicated low-pressure pulsed-jet cleaning experiments.The flow structure inside the bag and the response characteristics of its wall have also been analyzed numerically through a computational fluid-dynamics/structural-dynamics(CFD-CSD)unidirectional fluid-solid coupling method.As shown by the experiments,the peak pressure(P_(0))on the wall of the filter bag with N=8 and 12 is higher,which indicates dust can be removed more effectively in these cases.The peak pressure on the wall increases first and then decreases along the direction of the bag length,while the peak pressure of the pleated filter bag with nonwoven needled felt film coating is greater than that without film coating.A comprehensive analysis of the time variation of acceleration,deformation,strain,stress and other factors,has led to the conclusion that the pleated filter bag with N=12 would be the optimal choice.
文摘Pleated Skirts,an ethnic folk original picture book on Batik,creating intricate patterns on the fabric of Miao costumes with traditional dyeing techniques,this book has woven the intangible cultural heritage of Miao ethnic groups into a lively and interesting fairy tale,presenting young readers with a beautiful world full of folk wisdom,not only boasting boundless imagination but also aligning with traditional cultural values,promoting good and punishing evil,and emphasizing unity and mutual assistance.Adopting Miao batik as the illustration style,the unique blue and white colors and simple painting designs have fully embodied the Miao essence,especially the Danzhai batik,with the features of secondary dyeing popular in the region of west Guizhou Province,enriching the expressiveness of the picture.Additionally,the beauty of lines and blank space in traditional Chinese painting in such a book improves the children's perception of ethnic traditional art and cultivates their diverse acsthetic abilities.Thus,it is of great academic value and practical significance to study the profound connotation of the Miao traditional culture.
文摘In this study, the three-dimensional physical model of pleated air filtration media was simplified to porous media model, and the calculation parameters of porous media were obtained based on experimental data. The model of V-shaped pleated air filter media is constructed, the height of the media pleat is 50 mm and the pleat thickness is 4 mm, the pleat angle is 3.7°. The Hertz-Mindlin contact model was modified by Johnson Kendall Roberts (JKR) adhesion contact model. The deposition process of particles in media was simulated based on computational fluid dynamics (CFD) theory and discrete element method (DEM). Results show that the CFD–DEM coupling method can be effectively applied to the macro research of pleated air filter media. The particles will form dust layer and dendrite structure on the fiber surface, and the dust layer will affect the subsequent air flow organization, and the dendrite structure will eventually form a “particle wall”. The formation of the “particle wall” will prevent the particles from moving further in the fluid domain, which makes area of pleated angle become the “low efficiency” part about the particle deposition. Compared with area of pleated angle, the particles are concentrated in the opening area and the middle area of the pleated to agglomerate and deposit.
文摘In response to the limitations of conventional thermal management materials,such as restricted functionality,narrow temperature adaptability,and poor breathability,flexibility,and stretchability,this highlight presents a breathable,dual-mode leather-like nanotextile(LNT)with asymmetric pleated photonic microstructures and Janus wettability.This innovative design enables efficient and adaptive personal thermal regulation across a broad temperature range,while significantly improving wearer comfort through optimized moisture management and mechanical compliance.The proposed LNT opens new pathways for developing nextgeneration smart textiles,showing great potential for real-world applications in dynamic and demanding environments.
基金supported by a commissioned project from the Shanghai JINYOU Fluorine Materials Co.,LTD(grant number:kh0100020221266)the Shanghai Professional Technical Service Platform of Smart and Low-Carbon Controlled Built Environment(grant number:23DZ2290100).
文摘Due to the advantages of a large filtration area,elongated filter cartridges are gradually replacing filter bags in dust collectors.However,the production standards for these filter cartridges lack clarity in determining various parameters.Therefore,this paper combines experimental validation with computational fluid dynamics simulations to analyze the resistance characteristics of elongated filter cartridges,aiming to establish recommended parameter combinations for their optimal design.Single factor analysis and Response Surface Methodology(RSM)are employed for parameter optimization.The study establishes a quadratic regression model to predict resistance based on various filter cartridge parameters.Single factor analysis indicates that the optimal combination of length and pleat number is approximately diagonally distributed.The RSM ranks the factors’impacts on resistance as follows:length(L)>pleat number(N)≈pleat length(Pl)>filtering velocity(v_(f))>outer radius(R).The optimal parameter combination under global optimization is:N=43,P_(l)=23 mm,R=76 mm,L=2 m.Additionally,the study analyzes the distribution of normal and tangential velocities of airflow on the filter medium surface to understand their impact on filter lifespan.Results indicate that tangential velocity has a significant impact on filter wear,and locations with higher tangential velocity are situated in the bottom region of the fold at the outlet.
