Article
Mechanics
Seyyed Saeed Shojaee Zadeh, Vanessa Egan, Pat Walsh
Summary: This study provides a thorough understanding of the parameters influencing droplet velocity in liquid-liquid droplet flows. It reveals a complex relationship between droplet velocity and droplet length, viscosity ratio, and Bond number. The study also proposes a new expression to estimate the velocity of elongated droplets.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2022)
Article
Thermodynamics
Abdullah Al-Sharafi, Bekir S. Yilbas, Ahmet Z. Sahin, Hussain M. Al-Qahtani
Summary: Localized heating of hydrophobic droplets was studied, with a focus on the effects of restricted area heating and droplet size on heat transfer. Experimental results showed that hydrophobizing samples resulted in uniform contact angles over the entire surface, and increasing pin diameter and droplet size altered flow structures inside the droplet.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Engineering, Multidisciplinary
Eva de Botton, J. Barry Greenberg, Alumah Arad, David Katoshevski, Visakh Vaikuntanathan, Matthias Ibach, Bernhard Weigand
Summary: This study mathematically analyzes the motion of two dissimilar spherical non-evaporating liquid droplets moving vertically along their line of centers. It is found that under appropriate operating conditions, droplet grouping can occur, and the behavior of the distance between the droplets can be described and solved using an analytical method.
APPLIED MATHEMATICAL MODELLING
(2022)
Article
Thermodynamics
Ahmet Gultekin, Nejdet Erkan, Erdal Ozdemir, Uner Colak, Shunichi Suzuki
Summary: This study experimentally investigates the hydrodynamic behavior of multiple droplets impacting a heated sapphire glass, revealing that the simultaneous impact of multiple droplets exhibits different dynamics compared to a single droplet, with strong effects observed from the horizontal spacing and Weber number on the spreading area and uprising sheet. The research provides real-time high quality images and data, contributing to the limited experimental studies on simultaneous multiple droplet impact on a heated surface.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2021)
Article
Thermodynamics
Xiaoliang Liu, Lizhen Huang, Xuan Zhang, Long Zhang, Mengjie Song, Jun Shen
Summary: The freezing characteristics of sessile and pendant water droplets were studied under different conditions. It was found that there was almost no difference in the freezing characteristics of sessile and pendant droplets when the Bond number was below 1. However, when the Bond number was greater than 1, pendant droplets had a longer freezing time and higher height. The freezing height was approximately proportional to the initial height, and the ratio of freezing time by the pendant droplet to that by the sessile one scaled as Bo(1/4) when Bo > 1.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Mina M. K. Mikhaeel, Anthony M. Jacobi
Summary: The paper proposes and validates a model for predicting the transitional film Reynolds number between droplet and jet modes, which relies on thermodynamic availability and achieves higher accuracy and shorter computation time compared to existing models.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Engineering, Chemical
Guoqiang Wu, Sheng Chen
Summary: This study examines the collision of a droplet against a moving/fixed particle and compares the two scenarios using the lattice Boltzmann method. It is found that the collision of a moving droplet against a fixed particle exhibits three regimes, while the collision of a moving droplet against a moving particle only exhibits two regimes. Additionally, the deposition regime of a droplet colliding against a moving particle is observed to have two sub regimes for the first time.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Engineering, Electrical & Electronic
Danyil Azarkh, Melanie Geiger, Se-Hyeong Jung, Erik Noetzel, Rudolf Merkel, Andrij Pich, Uwe Schnakenberg
Summary: In this study, a magnet measurement setup based on electromagnets was developed to characterize the physical material properties of soft materials. The deformations of ferrofluid droplets were measured to calculate viscosity and Young's modulus values. The setup can be used to investigate local and time-dependent rheological properties of soft materials.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Engineering, Chemical
Weixi Guo, Chunying Zhu, Taotao Fu, Youguang Ma
Summary: Experimental investigation of droplet coalescence in a T-junction microchannel revealed four coalescence regimes and showed that droplets with different viscosities tend to coalesce, especially with a viscosity ratio between 1 and 6. The study also systematically examined the effects of viscosity ratio and droplet size on film drainage time and critical capillary number.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Physical
Nilamani Sahoo, Purbarun Dhar, Devranjan Samanta
Summary: This article investigates the magnetohydrodynamics of ferrofluid droplets impacting on different wettability surfaces in the presence of vertical magnetic field and discusses the effects of magnetic field on droplet dynamics. The study reveals that magnetic field can delay droplet pinch-off, suppress rebound, and a theoretical formulation based on energy conservation principle is proposed. The research shows that in high Bom conditions, the capillary waves and motion of the contact line of droplets are inhibited.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Energy & Fuels
Rong Gen Neo, Boo Cheong Khoo
Summary: This study demonstrates a significantly improved electrode configuration for water droplet energy harvesting devices, achieving a 55.42 times increase in output, and showing simple and cost-effective fabrication. Among different electrode configurations studied, the checkered-like electrode configuration performed the best.
Article
Engineering, Multidisciplinary
Amirmahdi Jafari, Amir Shamloo
Summary: This study utilized computational fluid dynamics (CFD) to investigate droplet formation in a square microfluidic cross-junction device. The impact of viscosity ratios on droplet characteristics was examined, with interesting behavior observed in the transition regime between dripping and jetting. The study also explored modifying the outflow channel's design to shift the transition boundary between squeezing and jetting regimes, without altering the operating conditions for both phases.
ENGINEERING APPLICATIONS OF COMPUTATIONAL FLUID MECHANICS
(2023)
Article
Chemistry, Physical
Zhifeng Hu, Xuan Zhang, Sihang Gao, Zhiping Yuan, Yukai Lin, Fuqiang Chu, Xiaomin Wu
Summary: This study reveals the spreading dynamics of droplets on ridged superhydrophobic surfaces through experiments, numerical simulations, and theoretical analysis. It shows significant asymmetry in the spreading and retraction dynamics in the axial and spanwise directions, as well as the existence of a critical size ratio affecting the maximum axial spreading coefficient. The maximum axial spreading coefficient can be reduced by 25-40% at the critical size ratio compared with that on flat surfaces.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Thermodynamics
Xiao Liu, Xiaoxin Yao, Ze Wang, Chenglong Tang
Summary: This study experimentally investigated the macroscopic and microscopic characteristics of liquid ammonia spray under different pressure ratios and ambient temperatures. It was found that the spray morphology and droplet size distribution vary significantly with different pressure and temperature conditions. The spray expands in the radial direction in the flare flash boiling region, while it contracts in the penetration direction in the transition flash boiling region. The droplet size and number density change with the increase of pressure, leading to a more uniform droplet size distribution. The ambient temperature has limited influence on the spray penetration and droplet size distribution.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Xiao Liu, Xiaoxin Yao, Ze Wang, Chenglong Tang
Summary: In this study, the macroscopic and microscopic characteristics of liquid ammonia spray were experimentally investigated. The results show that the spray expands significantly in the flare flash boiling region, while it is more contracted in the transition flash boiling region. Additionally, the spray tip penetration and velocity generally increase with the increase of pressure ratio, and the most probable droplet diameter moves to a larger value. The ambient temperature has limited influence on the spray penetration behaviors or the droplet size distribution.
APPLIED THERMAL ENGINEERING
(2023)
Article
Chemistry, Physical
Wenjing Tan, Chunmei Gao, Shifeng Ji, Yunqing Xing, Yi Guo, Baogui Liang
Summary: Membrane separation technology is widely used in wastewater treatment due to its cost-effectiveness and productivity. However, organic membrane fouling caused by humic acid is a major barrier to its further development. This study successfully addressed this issue through the production of composite materials and self-cleaning membranes, providing beneficial strategies and solutions for membrane contamination problems.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2024)
Article
Chemistry, Physical
Qichang Peng, Qingdong Ruan, Bin Wang, Jinyuan Liu, Chao Huang, Xingwang Zhu, Dan Li, Liangliang Liu, Yinchuan Wang, Xiaolin Zhang, Jia Yan, Paul K. Chu, Hui Xu
Summary: The escalating issue of water pollution has led to significant attention in the field of photocatalysis. In this study, OV-Sb2WO6-X photocatalyst with oxygen vacancies was synthesized, which exhibited enhanced charge separation efficiency and improved photocatalytic activity. The introduction of oxygen vacancies was successfully controlled and characterized, and the modified photocatalyst showed superior degradation efficiency for dye wastewater treatment.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2024)
Article
Chemistry, Physical
Wangcheng Zhang, Cunchuan Zheng, Hu Xie, Weichao Du
Summary: By using a specific curing agent ETB, the problem of dispersion and stability for oily epoxy resin in cement slurry system has been successfully solved. The application of the emulsified curing agent ETB in oilfield cement slurry system shows good rheological performance, resistance to high temperature and high pressure water loss, and corrosion resistance.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2024)
Article
Chemistry, Physical
O. I. Krivonos, A. Babenko, O. B. Belskaya
Summary: This study synthesized biochar based on sapropel and investigated the effects of chemical modification on its textural characteristics, acid-base properties, and adsorption properties. The results showed that the chemical modification increased the fraction of micropores, specific surface area, and changed the surface properties of biochar. The experiment also revealed that biochar pretreated with alkali exhibited the maximum adsorption capacity for copper ions. A conceptual model identifying the mechanisms of copper adsorption on sapropel-based biosorbent was proposed.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2024)
Article
Chemistry, Physical
H. Lachhab, N. Benzbiria, A. Titi, S. Echihi, M. E. Belghiti, Y. Karzazi, A. Zarrouk, R. Touzani, C. Jama, F. Bentiss
Summary: The corrosion inhibitory potency of two new pyrimidine-pyrazole derivatives, PPA and PPC, was evaluated for mild steel in 1 M HCl. The results showed enhanced inhibition activities with increased concentration, reaching maximal values of 91.15% and 92.39% for PPA and PPC, respectively. However, the mitigation potency decreased with increasing temperature. SEM and XPS analysis revealed that PPA and PPC adsorbed on the mild steel surface, forming a shielding layer that prevented the dissolution of the steel in the acidic solution.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2024)
Article
Chemistry, Physical
Shanmugapriya Sivalingam, D. Jeya Sundara Sharmila, Goutham Golla, Lakshmanan Arunachalam, Tarunendu Singh, G. Karthikeyan, A. Shanthi, Kannan Malaichamy
Summary: This study aims to develop a nano-biofungicide comprising of volatile essential oil molecules to enhance its efficacy in the field of agriculture through easily scalable green synthesis technique. The nano biofungicide was prepared through one pot hot melt ultrasonication technique with easy water dispersibility and long term stability. The physico-chemical analysis revealed that, nano bio-fungicides were amorphous sphere-shaped nanoparticles with low melting point. The encapsulation efficiency of major components of essential oil was determined, and it was found that they followed Higuchi model of release kinetics. The essential oil loaded nanostructured lipid carrier showed significantly higher mycelial growth inhibition compared to pure essential oil, indicating enhanced bio-efficacy.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2024)
Article
Chemistry, Physical
Yinlong Li, Yingqing Zhan, Yiwen Chen, Hongshan Jia, Ximin Chen, Fei Zhu, Xulin Yang
Summary: In this study, ZnO quantum dots decorated MXene nanosheets were used as a functional filler for waterborne epoxy coating. The improved dispersion and synergy of ZnO QDs and MXene nanosheets enhanced the anticorrosion performance of the coating.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2024)
Article
Chemistry, Physical
Fucheng Guan, Jing Tao, Qiang Yao, Zheng Li, Yihang Zhang, Shi Feng, Jianbin Sun, Qiang Yang, Xuecui Song, Jing Guo, Yuanfa Liu
Summary: This paper presents a method for preparing adsorbent materials based on biomass that can efficiently adsorb methylene blue. The experimental results show that the material has a hierarchical structure, high adsorption capacity, and reusability.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2024)
Article
Chemistry, Physical
Pengfei Hu, Zuli Mo, Weiliang Wang, Chengzhe Li, Zhaojia Guo, Guanqing Lin, Zhimin Guo
Summary: This study developed a novel in-situ particle vision and measurement (PVM) system to investigate heterocoagulation between coarse and fine particles in mineral processing. The experimental results showed that the degree of heterocoagulation decreased with increasing pH and stirring speed. Furthermore, under certain hydrodynamic conditions, coal particles were more distributed at the rear of the glass bead.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2024)
Article
Chemistry, Physical
Tanveer ul Haq Zia, Anwar ul Haq Ali Shah, Behisht Ara, Kashif Gul
Summary: A label-free immunosensor for detection of hepatitis C core antigen was fabricated using a ternary nanocomposite based on polypyrrole, silver doped zinc oxide, and exfoliated graphene. The immunosensor demonstrated low detection limit, high selectivity, and stability.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2024)
Article
Chemistry, Physical
Xiaoyan Feng, Jiachen Li, Lijun Liang, Linli Zhu, Sa Liu, Li Ren
Summary: In this study, polystyrene divinylbenzene microspheres were surface-modified by poly(carboxybetaine methacrylate) to develop an efficient hemoperfusion adsorbent for the removal of protein-bound toxins. The modified microspheres showed increased adsorption capacity and better biocompatibility, making them promising for clinical hemoperfusion therapy.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2024)
Article
Chemistry, Physical
Xiaoye Bi, Dong Xue, Yunpeng Wang, Chencheng Lv, Zexiong Li, Tao Zhao
Summary: This research aimed to develop a durable and formaldehyde-free flame retardant treatment for cotton fabrics. The results demonstrated successful grafting of phosphorous acid (PA) onto cotton fabrics, leading to enhanced flame resistance while maintaining the desired fabric characteristics.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2024)
Article
Chemistry, Physical
Ruolin Wang, Wenjuan Sun, Haisheng Han, Dongping Tao
Summary: This study finds that Al-starch colloidal depressants can effectively inhibit the flotation of ultrafine calcite and chlorite, and increase the grade of valuable minerals. The chemisorption of Al-starch on mineral surface changes the functional group peaks and generates new O-Al functional groups.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2024)
Article
Chemistry, Physical
Wondimu K. Wakejo, Ali Maged, Beteley T. Meshesha, Joon W. Kang, Abayneh G. Demesa, Sandip Chakrabarti, Thallada Bhaskar, Ashok Kumar Gupta, Amit Bhatnagar
Summary: Simultaneously removing different pharmaceutical pollutants from wastewater is an important environmental issue, and the use of a system that can remove multiple contaminants at once is necessary. Functionalized biochar (FBC) has been found to be effective in simultaneously removing acetaminophen and ciprofloxacin and other pharmaceutical pollutants.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2024)
Article
Chemistry, Physical
Yu Wang, Fengwen Yan, Jie Wu, Zhijun Huang, Liuting Song, Shunda Yuan
Summary: In this study, Cu single atoms are anchored on the external surface of g-C3N4 nanofibers to maximize atom utilization. This catalyst exhibits excellent Fenton-like catalytic activity and good stability due to the full utilization of Cu active sites.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2024)