Drying is a critical step in the fabrication of high-quality films for solar cells,directly affecting the film morphology,uniformity,crystallinity,and ultimately the performance and stability of the device[1,2].During...Drying is a critical step in the fabrication of high-quality films for solar cells,directly affecting the film morphology,uniformity,crystallinity,and ultimately the performance and stability of the device[1,2].During the drying process,the solvent used in film deposition is removed,enabling the proper formation and arrangement of active materials.展开更多
A dynamic uniform Cartesian grid system was developed in order to reduce the computational time in inundation simulation using a Godunov-type finite volume scheme. The reduction is achieved by excluding redundant dry ...A dynamic uniform Cartesian grid system was developed in order to reduce the computational time in inundation simulation using a Godunov-type finite volume scheme. The reduction is achieved by excluding redundant dry cells, which cannot be effectively avoided with a conventional Cartesian uniform grid system, as the wet area is unknown before computation. The new grid system expands dynamically with wetting, through addition of new cells according to moving wet-dry fronts. The new grid system is straightforward in implementation. Its application in a field-scale flood simulation shows that the new grid system is able to produce the same results as the conventional grid, but the computational efficiency is fairly improved.展开更多
The non-uniformity during the radio frequency(RF)-assisted hot air(HA)drying process can seriously affect the quality of jujube slices,leading to problems such as nutrient degradation,color deterioration,and prolonged...The non-uniformity during the radio frequency(RF)-assisted hot air(HA)drying process can seriously affect the quality of jujube slices,leading to problems such as nutrient degradation,color deterioration,and prolonged processing time.Existing research mainly focuses on the comparative study of the uniformity of material drying after processing by different drying methods,lacking research on the changes in uniformity during the drying process,their influencing mechanisms,and optimization schemes.In this study,coupled models of mass and heat transfer were respectively constructed for four drying processes:HA,RF applied in the early stage(E-HA+RF,0-1.5h),middle stage(M-HA+RF,1.5-3h)and late stage(L-HA+RF,1.5-3h)of HA.By using software such as MATLAB,the non-uniformity coefficient K was introduced to characterize the moisture distribution characteristics of jujube slices.The temperature distribution characteristics of jujube slices were characterized by the"overheated zone"and the temperature rise rate at the center of the jujube slices.After optimizing the radio frequency application mechanism through the coefficient of variation method,the quality indicators were experimentally verified.The results showed that M-HA+RF achieved the best drying effect.Compared with HA drying,the drying time of jujube slices was shortened by 43.75%,ΔE was reduced by 21.3%,and the VC content was increased by 18.6%.This study clarified the uniformity changes in RF-HA drying,their influencing mechanisms and optimization schemes,providing feasible strategies for improving the processing efficiency and product quality of agricultural products.展开更多
Spray drying is a typical method to produce particles in dry powder forms at industrial scale. Most spray-dried products often show a wide range of particle properties even within the same batch. At Monash University,...Spray drying is a typical method to produce particles in dry powder forms at industrial scale. Most spray-dried products often show a wide range of particle properties even within the same batch. At Monash University, we utilise a microfluidic spray drying approach to generate uniform microparticles with tightly controlled characteristics and sizes in a scalable, almost waste-flee process. The technique is useful to correlate the effects of formulation and spray drying conditions on the properties of spray-dried particles, and can be used to test new formulations for targeted applications such as encapsulation and release of active ingredients. The synthesis route can be applied to other self-assembling systems, includ- ing mesoporous, crystalline, and hierarchically structured microparticles. As spray drying is commonly used in commercial scales, the understanding of how functional particles are formed in relation to formulations and process conditions could assist in developing a cost effective, energy and material-efficient route to produce powders with better properties and ease of handling for more advanced applications such as selective adsorption and bio-separation.展开更多
This work is aimed to study the effects of component size and solubility on the surface composition of spray dried(SD)uniform two-component particles fabricated by micro-fluidic spray dryer.Various precursor liquid co...This work is aimed to study the effects of component size and solubility on the surface composition of spray dried(SD)uniform two-component particles fabricated by micro-fluidic spray dryer.Various precursor liquid consisting of small molecular of methionine(Met,33 g/L)or lysine(Lys,739 g/L)and large-sized silica(12 nm)were prepared by adjusting the mass ratio of components.X-ray energy disper-sive results showed that the respective enrichment degree(De)of Met and Lys on the surface of SD-M1S9 and-L1S9 prepared at 150 C were 182±9% and 125±14%.The De of hydrophobic Met for SD-M1S1 and-M9S1 were 46±9% and 4±2%,respectively,whereas relative hydrophilic Lys mainly distributed internal of the particle meanwhile the De of silica on the surface for SD-L1S1 and-L9S1 were 17±4%and 12±1%,respectively.Drying temperature(120 and 180℃)showed more apparent effect on the De of amino acid for the particles of less amino acid.The possible formation mechanism of surface composition and the surface composition impact on the wettability of particles were explored.These results provide new guidance for manufacturing functional SD powders with various components.展开更多
Low desulfurization efficiency impedes the wide application of dry desulfurization technology,which is a low-cost and simple process,and one significant solution is the development and manufacture of high-performance ...Low desulfurization efficiency impedes the wide application of dry desulfurization technology,which is a low-cost and simple process,and one significant solution is the development and manufacture of high-performance desulfurizers.In this study,firstly,a steam jet mill was used to digest quicklime;then,we utilized numerical simulation to study the flow field distribution and analyze the driving factors of quicklime digestion;and lastly,the desulfurization performance of the desulfurizer was evaluated under different relative humidities.The results show that the desulfurizer prepared via the steam jet mill had better apparent activity than traditional desulfurizers.Also,the entire jet flow field of the steam jet mill is in a supersonic and highly turbulent flow state,with high crushing intensity and good particle acceleration performance.Sufficient contact with the nascent surface maximizes the formation of slaked lime.The experiments demonstrated that the operating time with 100%desulfurization efficiency and the“break-through”time for the desulfurizer prepared via the steam jet mill is longer than that of traditional desulfurizers,and has significant advantages,especially at low flue gas relative humidity.Compared with traditional desulfurizers,the desulfurizer prepared via steam jet mill expands the range of acceptable flue gas temperature,and the failure temperature is 1.625 times that of traditional desulfurizers.This work breaks through the technical bottleneck of low dry desulfurization efficiency,which is an important step in pushing forward the application of dry desulfurization.展开更多
文摘Drying is a critical step in the fabrication of high-quality films for solar cells,directly affecting the film morphology,uniformity,crystallinity,and ultimately the performance and stability of the device[1,2].During the drying process,the solvent used in film deposition is removed,enabling the proper formation and arrangement of active materials.
基金supported by the National Natural Science Foundation of China(Grant No.19672016)the National Key R&D Program of China(Grant No.2016YFC0402704)+1 种基金the State Key Program of the National Natural Science Foundation of China(Grant No.41330858)the UK Natural Environment Research Council(NERC)(Grant No.NE/K008781/1)
文摘A dynamic uniform Cartesian grid system was developed in order to reduce the computational time in inundation simulation using a Godunov-type finite volume scheme. The reduction is achieved by excluding redundant dry cells, which cannot be effectively avoided with a conventional Cartesian uniform grid system, as the wet area is unknown before computation. The new grid system expands dynamically with wetting, through addition of new cells according to moving wet-dry fronts. The new grid system is straightforward in implementation. Its application in a field-scale flood simulation shows that the new grid system is able to produce the same results as the conventional grid, but the computational efficiency is fairly improved.
基金supported by the National Natural Science Foundation of China(Grant No.32460595)the Tianshan Talent Training Program(2023).
文摘The non-uniformity during the radio frequency(RF)-assisted hot air(HA)drying process can seriously affect the quality of jujube slices,leading to problems such as nutrient degradation,color deterioration,and prolonged processing time.Existing research mainly focuses on the comparative study of the uniformity of material drying after processing by different drying methods,lacking research on the changes in uniformity during the drying process,their influencing mechanisms,and optimization schemes.In this study,coupled models of mass and heat transfer were respectively constructed for four drying processes:HA,RF applied in the early stage(E-HA+RF,0-1.5h),middle stage(M-HA+RF,1.5-3h)and late stage(L-HA+RF,1.5-3h)of HA.By using software such as MATLAB,the non-uniformity coefficient K was introduced to characterize the moisture distribution characteristics of jujube slices.The temperature distribution characteristics of jujube slices were characterized by the"overheated zone"and the temperature rise rate at the center of the jujube slices.After optimizing the radio frequency application mechanism through the coefficient of variation method,the quality indicators were experimentally verified.The results showed that M-HA+RF achieved the best drying effect.Compared with HA drying,the drying time of jujube slices was shortened by 43.75%,ΔE was reduced by 21.3%,and the VC content was increased by 18.6%.This study clarified the uniformity changes in RF-HA drying,their influencing mechanisms and optimization schemes,providing feasible strategies for improving the processing efficiency and product quality of agricultural products.
文摘Spray drying is a typical method to produce particles in dry powder forms at industrial scale. Most spray-dried products often show a wide range of particle properties even within the same batch. At Monash University, we utilise a microfluidic spray drying approach to generate uniform microparticles with tightly controlled characteristics and sizes in a scalable, almost waste-flee process. The technique is useful to correlate the effects of formulation and spray drying conditions on the properties of spray-dried particles, and can be used to test new formulations for targeted applications such as encapsulation and release of active ingredients. The synthesis route can be applied to other self-assembling systems, includ- ing mesoporous, crystalline, and hierarchically structured microparticles. As spray drying is commonly used in commercial scales, the understanding of how functional particles are formed in relation to formulations and process conditions could assist in developing a cost effective, energy and material-efficient route to produce powders with better properties and ease of handling for more advanced applications such as selective adsorption and bio-separation.
基金supported by the National Natural Science Foundation of China(No.21878197)the Natural Science Foundation of Jjiangsu Province(No.BK20180096)+2 种基金Jiangsu Higher Education Iinstitutions(No.18KJA530004)the Suzhou Municipal Science and Technology Bureau(No.SYG201810)the Post-Doctoral Science Foundation ofjangsu(2021K356C)。
文摘This work is aimed to study the effects of component size and solubility on the surface composition of spray dried(SD)uniform two-component particles fabricated by micro-fluidic spray dryer.Various precursor liquid consisting of small molecular of methionine(Met,33 g/L)or lysine(Lys,739 g/L)and large-sized silica(12 nm)were prepared by adjusting the mass ratio of components.X-ray energy disper-sive results showed that the respective enrichment degree(De)of Met and Lys on the surface of SD-M1S9 and-L1S9 prepared at 150 C were 182±9% and 125±14%.The De of hydrophobic Met for SD-M1S1 and-M9S1 were 46±9% and 4±2%,respectively,whereas relative hydrophilic Lys mainly distributed internal of the particle meanwhile the De of silica on the surface for SD-L1S1 and-L9S1 were 17±4%and 12±1%,respectively.Drying temperature(120 and 180℃)showed more apparent effect on the De of amino acid for the particles of less amino acid.The possible formation mechanism of surface composition and the surface composition impact on the wettability of particles were explored.These results provide new guidance for manufacturing functional SD powders with various components.
基金supported by the Southwest University of Science and Technology(No.22zx7168)the Sichuan Science and Technology Program(No.2020YFG0186)。
文摘Low desulfurization efficiency impedes the wide application of dry desulfurization technology,which is a low-cost and simple process,and one significant solution is the development and manufacture of high-performance desulfurizers.In this study,firstly,a steam jet mill was used to digest quicklime;then,we utilized numerical simulation to study the flow field distribution and analyze the driving factors of quicklime digestion;and lastly,the desulfurization performance of the desulfurizer was evaluated under different relative humidities.The results show that the desulfurizer prepared via the steam jet mill had better apparent activity than traditional desulfurizers.Also,the entire jet flow field of the steam jet mill is in a supersonic and highly turbulent flow state,with high crushing intensity and good particle acceleration performance.Sufficient contact with the nascent surface maximizes the formation of slaked lime.The experiments demonstrated that the operating time with 100%desulfurization efficiency and the“break-through”time for the desulfurizer prepared via the steam jet mill is longer than that of traditional desulfurizers,and has significant advantages,especially at low flue gas relative humidity.Compared with traditional desulfurizers,the desulfurizer prepared via steam jet mill expands the range of acceptable flue gas temperature,and the failure temperature is 1.625 times that of traditional desulfurizers.This work breaks through the technical bottleneck of low dry desulfurization efficiency,which is an important step in pushing forward the application of dry desulfurization.
