Powder Technology最新文献

英文中文

Optimizing multistage fluidized bed reactor performance: Computational insights and design modifications

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-03-04 DOI: 10.1016/j.powtec.2025.120804

Haile Jose, Swapna Singha Rabha

Multistage fluidized bed reactors (MFBR) offer enhanced gas–solid interactions, longer residence times, and reduced bubble growth compared to conventional fluidized bed reactors, making them promising candidates for carbon capture applications. Understanding the hydrodynamics is crucial for optimizing the reactor design. This study presents a 2D numerical investigation of the hydrodynamics in a two-stage MFBR using the Euler–Euler Two-Fluid model, with the Syamlal O’Brien drag model tuned to experimental minimum fluidization conditions. The predicted pressure drops across the reactor stages closely matched experimental data, validating the model’s accuracy. Key parameters such as clearance height, gas velocity, and particle size were analyzed for their effects on pressure drop, solid holdup, velocity profiles, and solid entrainment flux. Additionally, the power consumption of the MFBR, based on pressure drop, was evaluated and compared to that of a conventional fluidized bed reactor. The results provide critical insights into the hydrodynamic behavior of MFBRs under various operating conditions, offering valuable guidance for optimizing reactor design, particularly for carbon capture using solid sorbents.

{"title":"Optimizing multistage fluidized bed reactor performance: Computational insights and design modifications","authors":"Haile Jose, Swapna Singha Rabha","doi":"10.1016/j.powtec.2025.120804","DOIUrl":"10.1016/j.powtec.2025.120804","url":null,"abstract":"<div><div>Multistage fluidized bed reactors (MFBR) offer enhanced gas–solid interactions, longer residence times, and reduced bubble growth compared to conventional fluidized bed reactors, making them promising candidates for carbon capture applications. Understanding the hydrodynamics is crucial for optimizing the reactor design. This study presents a 2D numerical investigation of the hydrodynamics in a two-stage MFBR using the Euler–Euler Two-Fluid model, with the Syamlal O’Brien drag model tuned to experimental minimum fluidization conditions. The predicted pressure drops across the reactor stages closely matched experimental data, validating the model’s accuracy. Key parameters such as clearance height, gas velocity, and particle size were analyzed for their effects on pressure drop, solid holdup, velocity profiles, and solid entrainment flux. Additionally, the power consumption of the MFBR, based on pressure drop, was evaluated and compared to that of a conventional fluidized bed reactor. The results provide critical insights into the hydrodynamic behavior of MFBRs under various operating conditions, offering valuable guidance for optimizing reactor design, particularly for carbon capture using solid sorbents.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"456 ","pages":"Article 120804"},"PeriodicalIF":4.5,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550813","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}

引用次数: 0

Numerical study on the collection performance according to tilt angle of the collection plate in ESPs

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-03-03 DOI: 10.1016/j.powtec.2025.120873

Jeong Geun Gwon , Ho Yeon Choi , Young Min Seo , Seokho Kim , Hoon Ki Choi , Yong Gap Park

Particulate matter poses serious accident risks and health hazards, making control technologies essential. This study aims to analyze the effectiveness of electrostatic precipitators (ESPs) using corona discharge in reducing particulate matter. We analyze three performance influencing parameters: the applied voltage (φ_wire = 6, 9, and 12 kV), volumetric flow rate (Q = 0.05, 0.1, and 0.15 m³/s), and tilt angle of collection plate (θ_tilt = −2.1, −1.4, −0.7, 0, 0.7, 1.4, and 2.1°). In the electric field, the average corona current per unit length of the discharge electrode is enhanced by a maximum of 14.08 % at θ_tilt = 2.1° and − 2.1° when compared to that at θ_tilt = 0°. In the gas flow field, as the tilt angle increases at θ_tilt = 0.7° ∼ 2.1°, the pressure drop also increases corresponding to the applied voltage. This result is reversed at θ_tilt = −2.1° ∼ −0.7°. In particle motion, the larger the tilt angle, the greater the charge of the particle. The collection efficiency at θ_tilt = 2.1° increases by approximately 10 % at φ_wire = 9 kV and Q = 0.1 m³/s, compared to that at θ_tilt = −2.1°. However, in long-term operation, θ_tilt = −2.1° is most advantageous due to its even distribution of particles across the collection plate.

{"title":"Numerical study on the collection performance according to tilt angle of the collection plate in ESPs","authors":"Jeong Geun Gwon , Ho Yeon Choi , Young Min Seo , Seokho Kim , Hoon Ki Choi , Yong Gap Park","doi":"10.1016/j.powtec.2025.120873","DOIUrl":"10.1016/j.powtec.2025.120873","url":null,"abstract":"<div><div>Particulate matter poses serious accident risks and health hazards, making control technologies essential. This study aims to analyze the effectiveness of electrostatic precipitators (ESPs) using corona discharge in reducing particulate matter. We analyze three performance influencing parameters: the applied voltage (<em>φ</em><sub>wire</sub> = 6, 9, and 12 kV), volumetric flow rate (<em>Q</em> = 0.05, 0.1, and 0.15 m<sup>3</sup>/s), and tilt angle of collection plate (<em>θ</em><sub>tilt</sub> = −2.1, −1.4, −0.7, 0, 0.7, 1.4, and 2.1°). In the electric field, the average corona current per unit length of the discharge electrode is enhanced by a maximum of 14.08 % at <em>θ</em><sub>tilt</sub> = 2.1° and − 2.1° when compared to that at <em>θ</em><sub>tilt</sub> = 0°. In the gas flow field, as the tilt angle increases at <em>θ</em><sub>tilt</sub> = 0.7° ∼ 2.1°, the pressure drop also increases corresponding to the applied voltage. This result is reversed at <em>θ</em><sub>tilt</sub> = −2.1° ∼ −0.7°. In particle motion, the larger the tilt angle, the greater the charge of the particle. The collection efficiency at <em>θ</em><sub>tilt</sub> = 2.1° increases by approximately 10 % at <em>φ</em><sub>wire</sub> = 9 kV and <em>Q</em> = 0.1 m<sup>3</sup>/s, compared to that at <em>θ</em><sub>tilt</sub> = −2.1°. However, in long-term operation, <em>θ</em><sub>tilt</sub> = −2.1° is most advantageous due to its even distribution of particles across the collection plate.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120873"},"PeriodicalIF":4.5,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143562419","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}

引用次数: 0

Improving heat transfer efficiency in a ribbed channel with two test sections using hybrid nanofluid

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-03-03 DOI: 10.1016/j.powtec.2025.120875

Fatima-Zahra Barhdadi , Ikrame Jamal , Salah Daoudi , Abderrahmane Kaouachi

Improving the rate of heat transfer is a key factor in making thermal devices for various industries more efficient and less energy consuming. With the development of corrugated channels that improve convection in an affordable way, passive techniques to optimize heat transfer have come to market. The objective of this study was to evaluate the performance of a new geometric design of a corrugated channel and the effect of hybrid nanofluids (Ag-ZnO/water, Ag-TiO₂/water, Ag-Al₂O₃/water and Ag-MgO/water) with different volume concentrations on heat transfer enhancement. The results show that the new geometry of the corrugated channel increases the Nusselt number and the Performance Evaluation Criterion by 94 % and 13,73 % respectively compared to the smooth channel and by 10,31 % compared to the previously studied ribbed channel. The increase the Reynolds number improves the heat transfer due to higher flow velocities and rib disturbance. However, the presence of ribs results in higher friction factors and pressure drop compared to smooth channels, which we have attempted to reduce by up to 14 % by increasing the rib width. The introduction of Ag (0.5 %)-TiO₂(1.5 %)/water hybrid nanofluid increases heat transfer by 16.75 % compared to water. In addition, the use of Syltherm 800 as the base fluid increases the heat transfer enhancement to a good level. These results contribute to understanding the effects of rib distribution over two test sections, rib width and nanoparticle volume fraction in hybrid nanofluids on ribbed channel performance. They also help to optimize the design of efficient heat transfer systems.

{"title":"Improving heat transfer efficiency in a ribbed channel with two test sections using hybrid nanofluid","authors":"Fatima-Zahra Barhdadi , Ikrame Jamal , Salah Daoudi , Abderrahmane Kaouachi","doi":"10.1016/j.powtec.2025.120875","DOIUrl":"10.1016/j.powtec.2025.120875","url":null,"abstract":"<div><div>Improving the rate of heat transfer is a key factor in making thermal devices for various industries more efficient and less energy consuming. With the development of corrugated channels that improve convection in an affordable way, passive techniques to optimize heat transfer have come to market. The objective of this study was to evaluate the performance of a new geometric design of a corrugated channel and the effect of hybrid nanofluids (Ag-ZnO/water, Ag-TiO<sub>2</sub>/water, Ag-Al<sub>2</sub>O<sub>3</sub>/water and Ag-MgO/water) with different volume concentrations on heat transfer enhancement. The results show that the new geometry of the corrugated channel increases the Nusselt number and the Performance Evaluation Criterion by 94 % and 13,73 % respectively compared to the smooth channel and by 10,31 % compared to the previously studied ribbed channel. The increase the Reynolds number improves the heat transfer due to higher flow velocities and rib disturbance. However, the presence of ribs results in higher friction factors and pressure drop compared to smooth channels, which we have attempted to reduce by up to 14 % by increasing the rib width. The introduction of Ag (0.5 %)-TiO<sub>2</sub>(1.5 %)/water hybrid nanofluid increases heat transfer by 16.75 % compared to water. In addition, the use of Syltherm 800 as the base fluid increases the heat transfer enhancement to a good level. These results contribute to understanding the effects of rib distribution over two test sections, rib width and nanoparticle volume fraction in hybrid nanofluids on ribbed channel performance. They also help to optimize the design of efficient heat transfer systems.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120875"},"PeriodicalIF":4.5,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143562418","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}

引用次数: 0

Clustering behavior of solid particles in gas-liquid-solid circulating fluidized beds studied by telecentric photography

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-03-02 DOI: 10.1016/j.powtec.2025.120857

Yongli Ma , Jiaming Zhang , Hang Xiao , Mingyan Liu

The clustering behavior of solid particles in the riser of a gas-liquid-solid circulating fluidized bed significantly affects phase mixing, mass and heat transfer characteristics, but little work has been carried out on this topic. To fill this knowledge gap, we used an invasive telecentric photography to measure and investigate the axial and radial distributions of cluster characteristics of solid particles in the riser of the three-phase circulating fluidized bed. The results showed that at present experimental conditions, cluster size followed a log-normal distribution in the riser. Within the ranges of superficial gas, liquid and particle velocity of 5.6 × 10⁻³ to 11.2 × 10⁻³ m/s, 112 × 10⁻³ to 162 × 10⁻³ m/s, and 0.85 × 10⁻³ to 2 × 10⁻³ m/s (or auxiliary liquid velocity 20 × 10⁻³ to 50 × 10⁻³ m/s), respectively, 90 % of clusters consisted of about 2 solid particles, with sizes ranging from 0.7 mm to 1.2 mm. Cluster size and velocity increased with superficial liquid velocity, but they were less affected by superficial gas velocity and exhibited a radial structure. Particle aggregation by shedding vortices leads to the cluster formation.

{"title":"Clustering behavior of solid particles in gas-liquid-solid circulating fluidized beds studied by telecentric photography","authors":"Yongli Ma , Jiaming Zhang , Hang Xiao , Mingyan Liu","doi":"10.1016/j.powtec.2025.120857","DOIUrl":"10.1016/j.powtec.2025.120857","url":null,"abstract":"<div><div>The clustering behavior of solid particles in the riser of a gas-liquid-solid circulating fluidized bed significantly affects phase mixing, mass and heat transfer characteristics, but little work has been carried out on this topic. To fill this knowledge gap, we used an invasive telecentric photography to measure and investigate the axial and radial distributions of cluster characteristics of solid particles in the riser of the three-phase circulating fluidized bed. The results showed that at present experimental conditions, cluster size followed a log-normal distribution in the riser. Within the ranges of superficial gas, liquid and particle velocity of 5.6 × 10<sup>−3</sup> to 11.2 × 10<sup>−3</sup> m/s, 112 × 10<sup>−3</sup> to 162 × 10<sup>−3</sup> m/s, and 0.85 × 10<sup>−3</sup> to 2 × 10<sup>−3</sup> m/s (or auxiliary liquid velocity 20 × 10<sup>−3</sup> to 50 × 10<sup>−3</sup> m/s), respectively, 90 % of clusters consisted of about 2 solid particles, with sizes ranging from 0.7 mm to 1.2 mm. Cluster size and velocity increased with superficial liquid velocity, but they were less affected by superficial gas velocity and exhibited a radial structure. Particle aggregation by shedding vortices leads to the cluster formation.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"456 ","pages":"Article 120857"},"PeriodicalIF":4.5,"publicationDate":"2025-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550819","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}

引用次数: 0

Addition of superfine natural zeolite to improve rheological properties of self-consolidating concrete

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-03-01 DOI: 10.1016/j.powtec.2025.120868

J.J. Chen , G.X. Guan

A high packing density is essential to provide self-consolidating concrete (SCC) superior rheological performance. The superfine natural zeolite (SNZ), ground from natural zeolite to have a size finer than cement, can fill the voids between cement grains for packing density improvement. To evaluate the effect of SNZ on rheological properties and the effect of this change in rheological properties on flowability, a total of 28 concrete mixes with different SNZ contents at different paste volume were produced to test yield stress, apparent viscosity, pseudoplastic index, slump-flow and flow rate. The roles of yield stress and apparent viscosity on flowability of SNZ concrete were quantified. And, to reveal the causes of these effects of SNZ on rheological properties and flowability, the changes in packing density and film thicknesses of the concrete mixes were measured. The results disclosed that the effect of SNZ on rheological properties was dependent on the SNZ content and the paste volume. The SNZ affected the flowability through film thicknesses and consequently through rheological properties, and affected the pseudoplastic index mainly through packing density. Addition of 10 % SNZ increased the strength, decreased yield stress and apparent viscosity and slightly increased pseudoplastic index. It is concluded that SNZ has a potential to improve rheological properties to produce high-strength SCC.

{"title":"Addition of superfine natural zeolite to improve rheological properties of self-consolidating concrete","authors":"J.J. Chen , G.X. Guan","doi":"10.1016/j.powtec.2025.120868","DOIUrl":"10.1016/j.powtec.2025.120868","url":null,"abstract":"<div><div>A high packing density is essential to provide self-consolidating concrete (SCC) superior rheological performance. The superfine natural zeolite (SNZ), ground from natural zeolite to have a size finer than cement, can fill the voids between cement grains for packing density improvement. To evaluate the effect of SNZ on rheological properties and the effect of this change in rheological properties on flowability, a total of 28 concrete mixes with different SNZ contents at different paste volume were produced to test yield stress, apparent viscosity, pseudoplastic index, slump-flow and flow rate. The roles of yield stress and apparent viscosity on flowability of SNZ concrete were quantified. And, to reveal the causes of these effects of SNZ on rheological properties and flowability, the changes in packing density and film thicknesses of the concrete mixes were measured. The results disclosed that the effect of SNZ on rheological properties was dependent on the SNZ content and the paste volume. The SNZ affected the flowability through film thicknesses and consequently through rheological properties, and affected the pseudoplastic index mainly through packing density. Addition of 10 % SNZ increased the strength, decreased yield stress and apparent viscosity and slightly increased pseudoplastic index. It is concluded that SNZ has a potential to improve rheological properties to produce high-strength SCC.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"456 ","pages":"Article 120868"},"PeriodicalIF":4.5,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550818","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}

引用次数: 0

Experimental study on static and discharge lateral pressure of three-compartment cement silo wall

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-03-01 DOI: 10.1016/j.powtec.2025.120866

Haiyan Liu , Xianmei He , Lingyu Wu , Qiang Liu , Xiaoxuan Fan , Xuefei Lu

In engineering applications, multi-compartment silos are employed to store and distribute various types of cement efficiently. In this paper, a three compartment silo with a diameter of 25 m and a height of 50 m is taken as the prototype. Based on it, two silo models are designed: a flat - bottomed model (Model 1) and an inverted cone bottomed model (Model 2). Both models have a diameter of 1 m and a height of 2 m. Cement static-discharging tests were carried out. The results showed that the deviation of static lateral pressure from Janssen's theory after fitting the two models was less than 10 %. Model 2 shows greater material inhomogeneity. During discharging, the lateral pressure peaks exhibit no obvious pattern, and a significant percentage of the lateral pressure peaks occur during the mass flow phase (98.8 % for Model 1 and 97.4 % for Model 2). Analyzing discharge side pressures using over-pressure coefficients has limitations. The revised lateral pressure formulas for three - compartment silos according to Chinese, European, and American standards are presented, and a lateral pressure calculation model is established.

{"title":"Experimental study on static and discharge lateral pressure of three-compartment cement silo wall","authors":"Haiyan Liu , Xianmei He , Lingyu Wu , Qiang Liu , Xiaoxuan Fan , Xuefei Lu","doi":"10.1016/j.powtec.2025.120866","DOIUrl":"10.1016/j.powtec.2025.120866","url":null,"abstract":"<div><div>In engineering applications, multi-compartment silos are employed to store and distribute various types of cement efficiently. In this paper, a three compartment silo with a diameter of 25 m and a height of 50 m is taken as the prototype. Based on it, two silo models are designed: a flat - bottomed model (Model 1) and an inverted cone bottomed model (Model 2). Both models have a diameter of 1 m and a height of 2 m. Cement static-discharging tests were carried out. The results showed that the deviation of static lateral pressure from Janssen's theory after fitting the two models was less than 10 %. Model 2 shows greater material inhomogeneity. During discharging, the lateral pressure peaks exhibit no obvious pattern, and a significant percentage of the lateral pressure peaks occur during the mass flow phase (98.8 % for Model 1 and 97.4 % for Model 2). Analyzing discharge side pressures using over-pressure coefficients has limitations. The revised lateral pressure formulas for three - compartment silos according to Chinese, European, and American standards are presented, and a lateral pressure calculation model is established.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120866"},"PeriodicalIF":4.5,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143551949","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}

引用次数: 0

Research on the parameter calibration and the interaction mechanisms of irregular wet particles

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-03-01 DOI: 10.1016/j.powtec.2025.120869

Jiacheng Zhou , Fei Liu , Libin Zhang , Liuyang Chen , Xuesong Wang , Chenlong Duan , Haishen Jiang , Miao Pan

To increase the accuracy of simulation parameters for wet irregular particles and investigate the interaction mechanisms between wet particles, the parameters for three types of irregular wet particles are calibrated and validated. Firstly, the models for the three types of wet irregular particles are constructed, and the corresponding stacking angles are obtained. Then, the linear regression equation between the significant parameters and the particle stacking angle is established to validate the relative errors. The results showed that the relative errors for the simulated and experimental stacking angles of the capsule, cassia seed, and colored sand particles are 1.83 %, 1.51 %, and 2.23 %, respectively. These relative errors are lower than those reported in existing literature. Moreover, particle fluidity tests are conducted to explore the particle interaction mechanisms. The results indicate that the smooth and hydrophilic particle surfaces are more likely to accumulate water molecules and form liquid bridges, which lead to enhanced adhesion and decreased particle fluidity. On the contrary, the liquid bridge is more prone to fracture on a rough and hydrophobic particle surface, which leads to decreased adhesion and enhanced particle fluidity. The study demonstrates that this parameter calibration method and the interaction mechanisms of wet irregular particles are reliable.

{"title":"Research on the parameter calibration and the interaction mechanisms of irregular wet particles","authors":"Jiacheng Zhou , Fei Liu , Libin Zhang , Liuyang Chen , Xuesong Wang , Chenlong Duan , Haishen Jiang , Miao Pan","doi":"10.1016/j.powtec.2025.120869","DOIUrl":"10.1016/j.powtec.2025.120869","url":null,"abstract":"<div><div>To increase the accuracy of simulation parameters for wet irregular particles and investigate the interaction mechanisms between wet particles, the parameters for three types of irregular wet particles are calibrated and validated. Firstly, the models for the three types of wet irregular particles are constructed, and the corresponding stacking angles are obtained. Then, the linear regression equation between the significant parameters and the particle stacking angle is established to validate the relative errors. The results showed that the relative errors for the simulated and experimental stacking angles of the capsule, cassia seed, and colored sand particles are 1.83 %, 1.51 %, and 2.23 %, respectively. These relative errors are lower than those reported in existing literature. Moreover, particle fluidity tests are conducted to explore the particle interaction mechanisms. The results indicate that the smooth and hydrophilic particle surfaces are more likely to accumulate water molecules and form liquid bridges, which lead to enhanced adhesion and decreased particle fluidity. On the contrary, the liquid bridge is more prone to fracture on a rough and hydrophobic particle surface, which leads to decreased adhesion and enhanced particle fluidity. The study demonstrates that this parameter calibration method and the interaction mechanisms of wet irregular particles are reliable.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120869"},"PeriodicalIF":4.5,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143562420","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}

引用次数: 0

Achieved fluidized crystal coating of aspirin by ensuring core stability and minimizing drug migration within the sustained layer

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-03-01 DOI: 10.1016/j.powtec.2025.120863

Yupeng Feng , Xin Liu , Zilin Song , Tong Liu , Zixu Liu , Peifu Xiao , Tian Yin , Yu Zhang , Haibing He , Jingxin Gou , Yanjiao Wang , Xing Tang

In this study, the fluidized crystal coating (FCC) method was proposed to prepare aspirin sustained-release capsules (ASC). The properties of aspirin crystals and their respective coating solutions were systematically investigated. Additionally, the crystal properties of aspirin (ASP) were analyzed by evaluating the contact angle and solid surface characteristics. The surface energy of the crystals before and after the coating process was also measured, providing essential insights into the preparation process. Pellets with coating weight gains of 2 % to 4 % (Part A) and 14 % to 17 % (Part B) were mixed in a 3:7 ratio to obtain the ASC. The resulting ASC exhibited a clear sustained-release effect. Nanoindentation experiments offered critical data supporting the FCC coating process and provided practical guidance for the operation of the coating process. Furthermore, Raman spectroscopy and TEM were employed to investigate the structure of the coated crystals. DSC and XRD analyses confirmed that the aspirin crystals did not undergo any crystallographic changes during the process. The combined results of these experiments demonstrate that the preparation of ASC using the FCC method is feasible and provides a new approach for the FCC coating process.

{"title":"Achieved fluidized crystal coating of aspirin by ensuring core stability and minimizing drug migration within the sustained layer","authors":"Yupeng Feng , Xin Liu , Zilin Song , Tong Liu , Zixu Liu , Peifu Xiao , Tian Yin , Yu Zhang , Haibing He , Jingxin Gou , Yanjiao Wang , Xing Tang","doi":"10.1016/j.powtec.2025.120863","DOIUrl":"10.1016/j.powtec.2025.120863","url":null,"abstract":"<div><div>In this study, the fluidized crystal coating (FCC) method was proposed to prepare aspirin sustained-release capsules (ASC). The properties of aspirin crystals and their respective coating solutions were systematically investigated. Additionally, the crystal properties of aspirin (ASP) were analyzed by evaluating the contact angle and solid surface characteristics. The surface energy of the crystals before and after the coating process was also measured, providing essential insights into the preparation process. Pellets with coating weight gains of 2 % to 4 % (Part A) and 14 % to 17 % (Part B) were mixed in a 3:7 ratio to obtain the ASC. The resulting ASC exhibited a clear sustained-release effect. Nanoindentation experiments offered critical data supporting the FCC coating process and provided practical guidance for the operation of the coating process. Furthermore, Raman spectroscopy and TEM were employed to investigate the structure of the coated crystals. DSC and XRD analyses confirmed that the aspirin crystals did not undergo any crystallographic changes during the process. The combined results of these experiments demonstrate that the preparation of ASC using the FCC method is feasible and provides a new approach for the FCC coating process.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"456 ","pages":"Article 120863"},"PeriodicalIF":4.5,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550814","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}

引用次数: 0

Effect of ethanol on in-situ deposition of nano calcium carbonate on cotton fibers

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-03-01 DOI: 10.1016/j.powtec.2025.120837

Zongbao Han , Yunli Wang , Weilin Xu

In this study, a method was employed to treat cotton fabrics with a mixed calcium hydroxide/ethanol/water solution system following the introduction of carbon dioxide, facilitating the in-situ deposition of nano calcium carbonate (NCC) on the cotton fibers. The findings revealed that the NCC particles formed on the fibers exhibit a diamond-shaped cubic morphology, characteristic of the calcite crystal type, with dimensions ranging from tens to hundreds of nanometers. The addition of ethanol contributes to the formation of NCC, with a maximum increase of about 2 times in calcium element content. The breaking strength of the cotton fabric was notably enhanced after deposition, with the addition of ethanol resulting in an approximate 8–10 % increase in breaking strength, much higher than that of sample without ethanol (∼ 4.2 %). The deposition modification did not significantly alter the chemical or crystalline structure of the cotton fibers. Additionally, the crystallization index of the fibers was improved to a certain degree, without compromising their hydrophilicity, thus not affecting subsequent dyeing and finishing processes. This has introduced a novel avenue for researchers to investigate and enhance the physical and mechanical properties of cotton fiber materials, which is beneficial for expanding their application fields.

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引用次数: 0

Inhibition mechanism of an expandable chemical inhibitor on aluminum dust explosions

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2025-02-28 DOI: 10.1016/j.powtec.2025.120855

Songling Jin, Wei Gao, Mingshu Bi, Haipeng Jiang, Fengyu Zhao, Tianjiao Zhang

In this study, an expandable chemical inhibitor was development synthesized using the mechanical alloying technique to mitigate aluminum dust explosions. The inhibition mechanism of aluminum dust explosion was further explored through numerical simulations. The results indicate that KHCO₃-EG powder achieved a maximum reduction of 89.85 % for flame propagation velocity. KHCO₃-EG compound powder formed a barrier that obstructed O₂ access and reduced heat transfer effects between powder particles by creating a dense, porous carbon layer with a worm-like structure. KHCO₃-EG compound powder absorbed heat produced during the combustion of aluminum particles, undergoing thermal decomposition to produce K-containing products. Kinetic simulations demonstrated that the composite inhibitor significantly decreased the concentrations of AlO and O, leading to stable O₂ formation. Catalytic cycles (K⇔KO and KO⇔KO₂) further decreased O atoms, lessening collisions between active groups and reducing explosive intensity. The study contributes theoretical and technical support for preventing and controlling aluminum dust explosion disasters.

{"title":"Inhibition mechanism of an expandable chemical inhibitor on aluminum dust explosions","authors":"Songling Jin, Wei Gao, Mingshu Bi, Haipeng Jiang, Fengyu Zhao, Tianjiao Zhang","doi":"10.1016/j.powtec.2025.120855","DOIUrl":"10.1016/j.powtec.2025.120855","url":null,"abstract":"<div><div>In this study, an expandable chemical inhibitor was development synthesized using the mechanical alloying technique to mitigate aluminum dust explosions. The inhibition mechanism of aluminum dust explosion was further explored through numerical simulations. The results indicate that KHCO<sub>3</sub>-EG powder achieved a maximum reduction of 89.85 % for flame propagation velocity. KHCO<sub>3</sub>-EG compound powder formed a barrier that obstructed O<sub>2</sub> access and reduced heat transfer effects between powder particles by creating a dense, porous carbon layer with a worm-like structure. KHCO<sub>3</sub>-EG compound powder absorbed heat produced during the combustion of aluminum particles, undergoing thermal decomposition to produce K-containing products. Kinetic simulations demonstrated that the composite inhibitor significantly decreased the concentrations of AlO and O, leading to stable O<sub>2</sub> formation. Catalytic cycles (K⇔KO and KO⇔KO<sub>2</sub>) further decreased O atoms, lessening collisions between active groups and reducing explosive intensity. The study contributes theoretical and technical support for preventing and controlling aluminum dust explosion disasters.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120855"},"PeriodicalIF":4.5,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143562421","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}

引用次数: 0

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