Pub Date : 2025-01-10DOI: 10.1016/j.powtec.2025.120650
Chi Thi Ha Nguyen , Kien Trung Nguyen , Bac Quang Nguyen , Chuc Ngoc Pham , Quang Van Ngo , Hoanh Ngoc Dao , Ha Thi Viet Luu , Mai Vu Ngoc Nguyen , Nhiem Ngoc Dao
This work attempts to remediate amoxicillin (AMX) as a long-life antibiotic model in aquatic environments using the BiVO4 (BVO) semiconductor photocatalyst. Monoclinic clinobisvanite BVO materials (BVO90, BVO120, BVO150, and BVO180) were prepared by the hydrothermal method at different calcination temperatures (90, 120, 150, and 180 °C). The homogeneous BVO150 particles with a visible-light-response bandgap energy of 2.36 eV showed the highest performance for AMX photodegradation within the as-prepared catalyst. AMX degradation in the solutions containing an initial AMX concentration of ≤10 ppm and a BVO150 dosage of ≥50 mg/L at pH 4 demonstrated a photodegradation efficiency of ≥93 % after 120 min. Moreover, AMX degradation on BVO photocatalysts also followed a pseudo-first-order kinetic model. The evaluation of BVO150 before and after five cycles of AMX photodegradation exhibited good durability and stability of materials. Finally, based on the data obtained from product analyses, a proposed mechanism and degradation pathway were discussed.
{"title":"Synthesis of monoclinic clinobisvanite BiVO4 for effective visible-light degradation of antibiotics in water: Photocatalytic performance, reaction kinetics, and mechanism","authors":"Chi Thi Ha Nguyen , Kien Trung Nguyen , Bac Quang Nguyen , Chuc Ngoc Pham , Quang Van Ngo , Hoanh Ngoc Dao , Ha Thi Viet Luu , Mai Vu Ngoc Nguyen , Nhiem Ngoc Dao","doi":"10.1016/j.powtec.2025.120650","DOIUrl":"10.1016/j.powtec.2025.120650","url":null,"abstract":"<div><div>This work attempts to remediate amoxicillin (AMX) as a long-life antibiotic model in aquatic environments using the BiVO<sub>4</sub> (BVO) semiconductor photocatalyst. Monoclinic clinobisvanite BVO materials (BVO90, BVO120, BVO150, and BVO180) were prepared by the hydrothermal method at different calcination temperatures (90, 120, 150, and 180 °C). The homogeneous BVO150 particles with a visible-light-response bandgap energy of 2.36 eV showed the highest performance for AMX photodegradation within the as-prepared catalyst. AMX degradation in the solutions containing an initial AMX concentration of ≤10 ppm and a BVO150 dosage of ≥50 mg/L at pH 4 demonstrated a photodegradation efficiency of ≥93 % after 120 min. Moreover, AMX degradation on BVO photocatalysts also followed a pseudo-first-order kinetic model. The evaluation of BVO150 before and after five cycles of AMX photodegradation exhibited good durability and stability of materials. Finally, based on the data obtained from product analyses, a proposed mechanism and degradation pathway were discussed.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"453 ","pages":"Article 120650"},"PeriodicalIF":4.5,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-09DOI: 10.1016/j.powtec.2025.120646
Haiming Yu , Yaowen Zhang , Yao Xie , Sen Xie , Peibei Wang
For the problem of serious dust pollution in the workface of integrated mechanized coal mining, this study proposes a new type of local negative pressure sealing dust prevention method. On account of the CFD-DPM approach, mechanisms of the impact of using a new method on dust pollution in diverse situations was studied. This study analyzed the diffusion of diverse sizes of dust. The results show that in the control group, the maximal dust loading in the footwalk void was above 500 mg/m3. During the coal cutting under a downwind or upwind situation, the cross-sectional size of the roadway where airflow passes through and the location of the coal mining wall altered, which resulted in a variation of the entering position and volume of the drum airflow into the footwalk void, thereby affecting the diffusion of dust. After using the new approach, under the downwind condition, the average value of dust load at the elevation of respiratory area in the footwalk void decreased by 93.2 %; under the upwind condition, the dust loading in the footwalk void should be controlled below 50.0 mg/m3. At an intake air speed of 1.5 m/s, the dust loading at the elevation of the pedestrian respiratory area is less than 156.6 mg/m3. The reduction in large particle dust reached 89 %, providing an innovative idea for coal mining operation dust reduction.
{"title":"Dust removal method for open space of fully mechanized mining face: A cutting area pressure balance method","authors":"Haiming Yu , Yaowen Zhang , Yao Xie , Sen Xie , Peibei Wang","doi":"10.1016/j.powtec.2025.120646","DOIUrl":"10.1016/j.powtec.2025.120646","url":null,"abstract":"<div><div>For the problem of serious dust pollution in the workface of integrated mechanized coal mining, this study proposes a new type of local negative pressure sealing dust prevention method. On account of the CFD-DPM approach, mechanisms of the impact of using a new method on dust pollution in diverse situations was studied. This study analyzed the diffusion of diverse sizes of dust. The results show that in the control group, the maximal dust loading in the footwalk void was above 500 mg/m<sup>3</sup>. During the coal cutting under a downwind or upwind situation, the cross-sectional size of the roadway where airflow passes through and the location of the coal mining wall altered, which resulted in a variation of the entering position and volume of the drum airflow into the footwalk void, thereby affecting the diffusion of dust. After using the new approach, under the downwind condition, the average value of dust load at the elevation of respiratory area in the footwalk void decreased by 93.2 %; under the upwind condition, the dust loading in the footwalk void should be controlled below 50.0 mg/m<sup>3</sup>. At an intake air speed of 1.5 m/s, the dust loading at the elevation of the pedestrian respiratory area is less than 156.6 mg/m<sup>3</sup>. The reduction in large particle dust reached 89 %, providing an innovative idea for coal mining operation dust reduction.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"453 ","pages":"Article 120646"},"PeriodicalIF":4.5,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100797","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-08DOI: 10.1016/j.powtec.2025.120637
Robert J. Macías , Juan C. Maya , Farid Chejne , Carlos M. Ceballos , Andrés F. Gómez
This work proposes a new scaling strategy for bubbling fluidized bed reactors. It is based on bubble size distribution, bubble coalescence phenomenon, and chemical reactivity, thus allowing us to deduct the dimensionless number which must remain around 0.45 at different scales to guarantee the fluidization regime. The proposed strategy is validated through computational simulations carried out under various operating conditions. Additionally, the limits for this scaling strategy to be valid were determined; they agree with those reported in the literature.
{"title":"A new scaling strategy for bubbling fluidized bed reactors based on population-balance model","authors":"Robert J. Macías , Juan C. Maya , Farid Chejne , Carlos M. Ceballos , Andrés F. Gómez","doi":"10.1016/j.powtec.2025.120637","DOIUrl":"10.1016/j.powtec.2025.120637","url":null,"abstract":"<div><div>This work proposes a new scaling strategy for bubbling fluidized bed reactors. It is based on bubble size distribution, bubble coalescence phenomenon, and chemical reactivity, thus allowing us to deduct the dimensionless number <span><math><mi>Φ</mi><mo>,</mo></math></span> which must remain around 0.45 at different scales to guarantee the fluidization regime. The proposed strategy is validated through computational simulations carried out under various operating conditions. Additionally, the limits for this scaling strategy to be valid were determined; they agree with those reported in the literature.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"453 ","pages":"Article 120637"},"PeriodicalIF":4.5,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-07DOI: 10.1016/j.powtec.2025.120630
Tian-sheng Liu , Tian-Li Bo
In this paper, a charging property measurement system for dust particles is developed that can reflect the particle collision process during real dust events. The experimental results show that with the increase of the incident velocity (vimp) of the impact particles and the particle size ratio (λ), the charge-to-mass ratio (q) of the impacted particle decreases. Upon comparing our results with existing experimental data, we observed that when the impacted particle is constrained, there is a possibility that the particle's q may be underestimated, and furthermore, there exists a qualitative difference in how q varies with the impact velocity (vimp). Based on the capacitor model, this paper presents a charge model of dust particles considering the vimp and λ. The representation equation of the parameter KQ in the model is determined based on the experimental data using the least squares method, indicating that its representation reflects the influence of both vimp and λ. Moreover, KQ dominates the influence of vimp on the q. The prediction results of the model are in good agreement with the experimental results.
{"title":"Experimental study on the charging process of dust particles","authors":"Tian-sheng Liu , Tian-Li Bo","doi":"10.1016/j.powtec.2025.120630","DOIUrl":"10.1016/j.powtec.2025.120630","url":null,"abstract":"<div><div>In this paper, a charging property measurement system for dust particles is developed that can reflect the particle collision process during real dust events. The experimental results show that with the increase of the incident velocity (<em>v</em><sub><em>imp</em></sub>) of the impact particles and the particle size ratio (λ), the charge-to-mass ratio (<em>q</em>) of the impacted particle decreases. Upon comparing our results with existing experimental data, we observed that when the impacted particle is constrained, there is a possibility that the particle's <em>q</em> may be underestimated, and furthermore, there exists a qualitative difference in how <em>q</em> varies with the impact velocity (<em>v</em><sub><em>imp</em></sub>). Based on the capacitor model, this paper presents a charge model of dust particles considering the <em>v</em><sub><em>imp</em></sub> and λ. The representation equation of the parameter <em>K</em><sub><em>Q</em></sub> in the model is determined based on the experimental data using the least squares method, indicating that its representation reflects the influence of both <em>v</em><sub><em>imp</em></sub> and λ. Moreover, <em>K</em><sub><em>Q</em></sub> dominates the influence of <em>v</em><sub><em>imp</em></sub> on the <em>q</em>. The prediction results of the model are in good agreement with the experimental results.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"453 ","pages":"Article 120630"},"PeriodicalIF":4.5,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-06DOI: 10.1016/j.powtec.2025.120625
Shijie Yu , Haishen Jiang , Ran Yang , Yuhan Liu , Xinhao Li , Shijun Li , Peng Guo , Long Huang , Yulong Zhang , Chenlong Duan , Haoran Song
In order to increase the vibration intensity of the screen surface and enhance the 1 mm elastic screening efficiency, a 1-mm complex additional excitation elastic screen surface was proposed. Through vibration tests, the kinematic characteristics of the complex additional excitation elastic screen surface at different operating stages are analyzed, the kinematic trajectory is reconstructed, and the influences of different parameters on the screen surface kinematic characteristics are explored. The screen surface undergoes large deformation, with the maximum average amplitude value in the x and z directions being 6.29 mm and 14.94 mm, respectively. The influences of different parameters on the elastic screening effect are assessed. With the increase of the excitation direction angle, total excitation force and excitation frequency, the screening efficiency firstly increased and then decreased. The order of significance obtained by response surface experiment is as follows: F > f > Ѱ. The actual screening efficiency was 79.47 %, and the total misplaced materials was 3.89 % under the optimal operating conditions.
{"title":"Research on the optimization of parameters of 1 mm elastic screening process with complex additional excitation","authors":"Shijie Yu , Haishen Jiang , Ran Yang , Yuhan Liu , Xinhao Li , Shijun Li , Peng Guo , Long Huang , Yulong Zhang , Chenlong Duan , Haoran Song","doi":"10.1016/j.powtec.2025.120625","DOIUrl":"10.1016/j.powtec.2025.120625","url":null,"abstract":"<div><div>In order to increase the vibration intensity of the screen surface and enhance the 1 mm elastic screening efficiency, a 1-mm complex additional excitation elastic screen surface was proposed. Through vibration tests, the kinematic characteristics of the complex additional excitation elastic screen surface at different operating stages are analyzed, the kinematic trajectory is reconstructed, and the influences of different parameters on the screen surface kinematic characteristics are explored. The screen surface undergoes large deformation, with the maximum average amplitude value in the <em>x</em> and <em>z</em> directions being 6.29 mm and 14.94 mm, respectively. The influences of different parameters on the elastic screening effect are assessed. With the increase of the excitation direction angle, total excitation force and excitation frequency, the screening efficiency firstly increased and then decreased. The order of significance obtained by response surface experiment is as follows: <em>F > f > Ѱ.</em> The actual screening efficiency was 79.47 %, and the total misplaced materials was 3.89 % under the optimal operating conditions.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"454 ","pages":"Article 120625"},"PeriodicalIF":4.5,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-06DOI: 10.1016/j.powtec.2024.120590
Jacob O. Wilson , Changmin Son , James Loebig , Rui Qiao
The impact of irregular micro-particles against ductile substrates is ubiquitous in engineering equipment, and predicting their rebound through reduced-order models is often necessary. Poor understanding of how non-spherical geometry influences rebound behavior – especially in the regime of finite plastic deformation of the substrate – greatly limits the utility of existing rebound models. Here, high-fidelity impact simulations are leveraged to extract the key features that emerge from irregular, fully resolved sand particle geometries and to identify the physical mechanisms driving them. We show that energy partitioning throughout the impact process differs fundamentally between the spherical and irregular sand particle geometries considered. Because of its relationship with rotation induced during impact, the normalized moment arm parameterization of global particle mass distribution is found to be highly effective in capturing these differences. Finer details of particle shape governing local contact geometry, e.g., local angularity, are argued to be of secondary importance.
{"title":"The role of irregular particle geometry in highly plastic impact","authors":"Jacob O. Wilson , Changmin Son , James Loebig , Rui Qiao","doi":"10.1016/j.powtec.2024.120590","DOIUrl":"10.1016/j.powtec.2024.120590","url":null,"abstract":"<div><div>The impact of irregular micro-particles against ductile substrates is ubiquitous in engineering equipment, and predicting their rebound through reduced-order models is often necessary. Poor understanding of how non-spherical geometry influences rebound behavior – especially in the regime of finite plastic deformation of the substrate – greatly limits the utility of existing rebound models. Here, high-fidelity impact simulations are leveraged to extract the key features that emerge from irregular, fully resolved sand particle geometries and to identify the physical mechanisms driving them. We show that energy partitioning throughout the impact process differs fundamentally between the spherical and irregular sand particle geometries considered. Because of its relationship with rotation induced during impact, the normalized moment arm parameterization of global particle mass distribution is found to be highly effective in capturing these differences. Finer details of particle shape governing local contact geometry, e.g., local angularity, are argued to be of secondary importance.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"453 ","pages":"Article 120590"},"PeriodicalIF":4.5,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-05DOI: 10.1016/j.powtec.2025.120607
Yutong Lai , Ci Peng , Weipeng Hu , Dejun Ning , Luhaibo Zhao , Zhiyong Tang
The establishment of a pressure prediction model in the gas-solid fluidization process enables acceptable forecasts of pressure drop, facilitating precise control and optimization of fluidized operations. Coupling effects between operational parameters and limited real-world samples further complicate model development. To address these issues, this paper proposes an industrial gas-solid fluidized bed axial pressure prediction model based on Scale-Invariant Feature Transform (SIFT) and Adaptive Optimization Random Forest (AO-RF). The SIFT module employs fixed distribution for data mapping, addressing the challenge of mismatch between feature and prediction data. Meanwhile, AO-RF effectively handles the complex relationships between limited samples and multi-scale data through Bayesian automatic hyperparameter optimization and robust model ensemble techniques, accurately capturing the nonlinear and dynamic characteristics of the fluidization process. Experimental results confirm the high prediction accuracy and generalization performance of the model, laying a solid foundation for AI (Artificial Intelligence) applications in industrial gas-solid fluidization processes.
{"title":"Adaptive optimization random forest for pressure prediction in industrial gas-solid fluidized beds","authors":"Yutong Lai , Ci Peng , Weipeng Hu , Dejun Ning , Luhaibo Zhao , Zhiyong Tang","doi":"10.1016/j.powtec.2025.120607","DOIUrl":"10.1016/j.powtec.2025.120607","url":null,"abstract":"<div><div>The establishment of a pressure prediction model in the gas-solid fluidization process enables acceptable forecasts of pressure drop, facilitating precise control and optimization of fluidized operations. Coupling effects between operational parameters and limited real-world samples further complicate model development. To address these issues, this paper proposes an industrial gas-solid fluidized bed axial pressure prediction model based on Scale-Invariant Feature Transform (SIFT) and Adaptive Optimization Random Forest (AO-RF). The SIFT module employs fixed distribution for data mapping, addressing the challenge of mismatch between feature and prediction data. Meanwhile, AO-RF effectively handles the complex relationships between limited samples and multi-scale data through Bayesian automatic hyperparameter optimization and robust model ensemble techniques, accurately capturing the nonlinear and dynamic characteristics of the fluidization process. Experimental results confirm the high prediction accuracy and generalization performance of the model, laying a solid foundation for AI (Artificial Intelligence) applications in industrial gas-solid fluidization processes.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"453 ","pages":"Article 120607"},"PeriodicalIF":4.5,"publicationDate":"2025-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-03DOI: 10.1016/j.powtec.2025.120612
Seong Hwan Kim , Donguk Kim , Hyun Wook Jung
Poly(vinyl alcohol) (PVA), as a polymeric binder, was incorporated into ceria-based suspensions to achieve better coating-relevant properties. The pH-dependent feature of PVA on the particle surface altered the interactions between the PVA-adsorbed ceria particles, significantly affecting the rheological and drying properties of the ceria–PVA suspensions. PVA adsorption on the ceria particles was determined by the PVA conformation, which resulted from the pH-dependent degree of ionization of its non-hydrolyzed acetate groups. This adsorption modified the primary interaction between PVA-adsorbed particles in suspensions, leading to either flocculation or stabilization, as confirmed with hydrodynamic diameter and zeta potential measurements. Suspensions with well-dispersed PVA-adsorbed ceria particles exhibited shear-thinning to Newtonian behavior, with weak thixotropic characteristics, whereas suspensions with flocculated particles displayed shear-thinning and strong thixotropic features. The mobility of the PVA-adsorbed ceria particles in sessile suspension droplets during drying, analyzed using multi-speckle diffusing wave spectroscopy, critically affected the final droplet patterns after drying.
{"title":"Effect of poly(vinyl alcohol) on the rheological and drying properties of aqueous ceria-based suspensions under various pH conditions","authors":"Seong Hwan Kim , Donguk Kim , Hyun Wook Jung","doi":"10.1016/j.powtec.2025.120612","DOIUrl":"10.1016/j.powtec.2025.120612","url":null,"abstract":"<div><div>Poly(vinyl alcohol) (PVA), as a polymeric binder, was incorporated into ceria-based suspensions to achieve better coating-relevant properties. The pH-dependent feature of PVA on the particle surface altered the interactions between the PVA-adsorbed ceria particles, significantly affecting the rheological and drying properties of the ceria–PVA suspensions. PVA adsorption on the ceria particles was determined by the PVA conformation, which resulted from the pH-dependent degree of ionization of its non-hydrolyzed acetate groups. This adsorption modified the primary interaction between PVA-adsorbed particles in suspensions, leading to either flocculation or stabilization, as confirmed with hydrodynamic diameter and zeta potential measurements. Suspensions with well-dispersed PVA-adsorbed ceria particles exhibited shear-thinning to Newtonian behavior, with weak thixotropic characteristics, whereas suspensions with flocculated particles displayed shear-thinning and strong thixotropic features. The mobility of the PVA-adsorbed ceria particles in sessile suspension droplets during drying, analyzed using multi-speckle diffusing wave spectroscopy, critically affected the final droplet patterns after drying.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"453 ","pages":"Article 120612"},"PeriodicalIF":4.5,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-03DOI: 10.1016/j.powtec.2024.120605
Fatemeh A. Talebi , Arash Rabbani , Mozhdeh Mehrabi , Andrew Stockdale , David Harbottle , Mehrdad Pasha , Ali Hassanpour
Powder adhesion often presents challenges within the pharmaceutical industry as it significantly affects powder flowability and understanding its relationship with powder flow, especially through modelling, presents a major advancement. Traditional approaches such as atomic force microscopy (AFM) and centrifuge method were previously utilised to measure the adhesive force of particles, however, these methods are both time and cost intensive necessitating the need for a more practical solution. This work endeavoured to investigate and develop a window of operation for measuring the effective work of adhesion of both regular and irregularly shaped powders using the drop test method, previously developed at the University of Leeds. For optimisation and accuracy in obtaining the critical diameter of adhesion, the drop test rig was further developed so as to ensure reliable and repeatable measurements of the impact velocity and contact time, which previously posed major challenges. The effective work of adhesion of ibuprofen powders across different sample volumes was measured, to establish a minimum number of analysed particles for ensuring the accuracy of the measured critical diameter. A minimum of 640 ibuprofen particles was required resulting into an effective work of adhesion of 19.6 ± 2.9 mJ/m2. Moreover, the approach was tested on spherical particles, where effective work of adhesion of spherical aluminium-alloy powders (7.7 ± 1.8 mJ/m2) was assessed. Furthermore, artificial intelligence is incorporated in parallel to effectively determine the critical diameter and compare it to the manually calculated values allowing for an efficient image analysis.
{"title":"Dynamic adhesion measurement of powders using the drop testing method: Defining a window of operation","authors":"Fatemeh A. Talebi , Arash Rabbani , Mozhdeh Mehrabi , Andrew Stockdale , David Harbottle , Mehrdad Pasha , Ali Hassanpour","doi":"10.1016/j.powtec.2024.120605","DOIUrl":"10.1016/j.powtec.2024.120605","url":null,"abstract":"<div><div>Powder adhesion often presents challenges within the pharmaceutical industry as it significantly affects powder flowability and understanding its relationship with powder flow, especially through modelling, presents a major advancement. Traditional approaches such as atomic force microscopy (AFM) and centrifuge method were previously utilised to measure the adhesive force of particles, however, these methods are both time and cost intensive necessitating the need for a more practical solution. This work endeavoured to investigate and develop a window of operation for measuring the effective work of adhesion of both regular and irregularly shaped powders using the drop test method, previously developed at the University of Leeds. For optimisation and accuracy in obtaining the critical diameter of adhesion, the drop test rig was further developed so as to ensure reliable and repeatable measurements of the impact velocity and contact time, which previously posed major challenges. The effective work of adhesion of ibuprofen powders across different sample volumes was measured, to establish a minimum number of analysed particles for ensuring the accuracy of the measured critical diameter. A minimum of 640 ibuprofen particles was required resulting into an effective work of adhesion of 19.6 ± 2.9 mJ/m<sup>2</sup>. Moreover, the approach was tested on spherical particles, where effective work of adhesion of spherical aluminium-alloy powders (7.7 ± 1.8 mJ/m<sup>2</sup>) was assessed. Furthermore, artificial intelligence is incorporated in parallel to effectively determine the critical diameter and compare it to the manually calculated values allowing for an efficient image analysis.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"453 ","pages":"Article 120605"},"PeriodicalIF":4.5,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100448","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-03DOI: 10.1016/j.powtec.2024.120604
Xiaofeng Mou, Wei Zhou, Zewei Bao, Weixing Huang
Precisely predicting the effective thermal conductivity (ETC) of gas–solid powder beds is crucial for industrial applications. In this study, influence of the Smoluchowski effect on the prediction of ETC under various pressures (pg) and gas atmospheres was analyzed. Subsequently, the Smoluchowski effect was incorporated to modify all terms associated with gas thermal conductivity in Kunii–Smith (KS) and simplified Zehner–Bauer–Schlünder (S-ZBS) models. Additionally, the modified S-ZBS and KS models were compared to another three classical theoretical models. Results indicate that the modified S-ZBS model showed the highest prediction accuracy, and could estimate precisely ETC of gas–solid powder beds under helium, nitrogen, and argon atmospheres at the temperature (Tave) of 20 and 60 °C, at pg = 0.3–4.0 MPa, and under air atmosphere at Tave = 30–75 °C. Finally, the reliability of the modified S-ZBS model was further validated by measured ETC results of four types of metal powder beds and experimental data from published literature.
{"title":"Modification and experimental validation of simplified Zehner-Bauer-Schlünder model for estimating effective thermal conductivity of gas–solid metal powder beds","authors":"Xiaofeng Mou, Wei Zhou, Zewei Bao, Weixing Huang","doi":"10.1016/j.powtec.2024.120604","DOIUrl":"10.1016/j.powtec.2024.120604","url":null,"abstract":"<div><div>Precisely predicting the effective thermal conductivity (ETC) of gas–solid powder beds is crucial for industrial applications. In this study, influence of the Smoluchowski effect on the prediction of ETC under various pressures (<em>p</em><sub>g</sub>) and gas atmospheres was analyzed. Subsequently, the Smoluchowski effect was incorporated to modify all terms associated with gas thermal conductivity in Kunii–Smith (KS) and simplified Zehner–Bauer–Schlünder (S-ZBS) models. Additionally, the modified S-ZBS and KS models were compared to another three classical theoretical models. Results indicate that the modified S-ZBS model showed the highest prediction accuracy, and could estimate precisely ETC of gas–solid powder beds under helium, nitrogen, and argon atmospheres at the temperature (<em>T</em><sub>ave</sub>) of 20 and 60 °C, at <em>p</em><sub>g</sub> = 0.3–4.0 MPa, and under air atmosphere at <em>T</em><sub>ave</sub> = 30–75 °C. Finally, the reliability of the modified S-ZBS model was further validated by measured ETC results of four types of metal powder beds and experimental data from published literature.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"453 ","pages":"Article 120604"},"PeriodicalIF":4.5,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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