Article
Chemistry, Physical
Janine Wilkinson, Chak Tam, Alexandros Askounis, Sheng Qi
Summary: This study aimed to minimize the coffee ring effect (CRE) by adding polymeric excipients to pharmaceutical solutions. It was found that increasing the viscosity of the solution can effectively prevent the undesirable radial flow of solute to the edge of the droplet, suppressing the CRE formation.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Chemistry, Physical
Michael J. Hertaeg, Clare Rees-Zimmerman, Rico F. Tabor, Alexander F. Routh, Gil Garnier
Summary: The study focuses on the formation of coffee rings in drying colloidal systems, showing that ring profiles are formed at low contact angles, which is consistent with experimental results.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Mechanics
Madeleine R. Moore, Alexander W. Wray
Summary: This study investigates the influence of gravity on solute transport during evaporation of thin droplets. Two asymptotic regimes are identified based on the size of the Bond number. The results provide quantitative predictions of the size, location, and shape of the solute mass profile, taking into account the interplay between advection, diffusion, surface tension, and gravity.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Chemistry, Physical
R. Mulka, A. Kujawska, B. Zajaczkowski, S. Mancin, M. H. Buschmann
Summary: By studying the formation and cracking process of coffee rings, this research discovered that the cracking speed of straight cracks is one order of magnitude greater than that of spiral cracks, providing insights into the formation of crack patterns following the desiccation of silica droplets.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Engineering, Chemical
N. M. Eijkelboom, A. C. M. Swinkels, J. de Ruiter, R. M. Boom, P. F. C. Wilms, M. A. I. Schutyser
Summary: In this study, high-resolution thermography and high-speed camera monitoring were used to characterize the drying behavior of single droplets containing solutes. A heat and mass transfer-based model accurately predicted the drying behavior of the droplets and explained the remaining differences. Tracking temperature with thermography allows for a better understanding of drying behavior and morphology development, leading to improved models for spray drying behavior.
JOURNAL OF FOOD ENGINEERING
(2023)
Article
Chemistry, Physical
Anusuya Pal, Amalesh Gope, Anupam Sengupta
Summary: Drying of biologically-relevant sessile droplets has great potential in biomedical applications, and this review provides an overview of the experimental progress in drying bio-colloidal droplets on solid substrates. The physical and material properties of relevant bio-colloids are summarized, and their composition is linked to the emerging drying patterns. The potential applications of drying droplets in diagnosing specific diseases and the recent investigations on bio-mimetic and salivary drying droplets in the context of COVID-19 are also discussed.
ADVANCES IN COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Physical
Abdur Rasheed, Omkar Hegde, Ritika Chatterjee, Srinivas Rao Sampathirao, Dipshikha Chakravortty, Saptarshi Basu
Summary: In naturally evaporating droplets, bacteria self-assemble into unique patterns based on their spatial location, resulting in varying physical forces and affecting their viability and infectivity. Self-assembly favors bacteria at the edge of the droplet, which has significant implications for understanding bacterial infection through droplets.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Physical
Junheng Ren, Alexandru Crivoi, Fei Duan
Summary: The formation of dendritic particle deposition after complete evaporation of unpinned sessile nanofluid droplets is related to particle self-assembly. Thicker branches and larger central cores are observed with an increase of particle concentrations.Experiment results show qualitative agreement with numerical simulations.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Chemistry, Physical
Gannena K. S. Raghuram, Lalit Bansal, Saptarshi Basu, Aloke Kumar
Summary: This study experimentally investigates the concentration and molecular weight dependence of deposit patterns of polymer droplets on hydrophobic surfaces. The results show a transition from ring to non-ring patterns with increasing concentration, while decreasing the polymer molecular weight does not suppress the coffee ring formation. The findings provide insights for applications like inkjet printing, surface coatings, and biotechnology assays where tuning polymer deposit patterns is important.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Thermodynamics
Longfei Xu, Liran Ma, Xuefeng Xu, Jianbin Luo
Summary: The study found that during the initial stage of droplet evaporation, the vapor concentration changes monotonically while the temperature changes nonmonotonically, with the initial transient times for both variables being almost the same. The duration of the initial transients in droplet evaporation is generally longer than the transient processes, indicating a longer adjustment period for vapor concentration and temperature as the evaporation proceeds.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Chemistry, Multidisciplinary
Yunjia Liu, Si Lin, Yali Zhu, Xiaoying Gao, Zhipeng Wang, Shenghong Yang, Jian Liu
Summary: A simple polyvinyl alcohol (PVA)-mediated evaporation drying strategy is introduced to uniformly deposit functional constituents on porous foam. PVA enhances the coffee-ring effect and stabilizes various functional constituents, resulting in homogeneous accumulation on the surface periphery of the foam. The deposition thickness is dependent on the feeding amounts of PVA but independent of drying temperature. Furthermore, the formation of core-shell foams is induced by 3D outward capillary flow driven by contact surface pinning and continual interfacial evaporation. The enhanced interfacial photothermal effect and solar desalination performance of PVA/polypyrrole-coated foam are demonstrated.
Article
Engineering, Chemical
Pallavi Katre, Sayak Banerjee, Saravanan Balusamy, Kirti Chandra Sahu
Summary: We investigated the retention force factor of pure and binary droplets laden with alumina nanoparticles placed on an inclined substrate. The critical angle of ethanol droplet increased with nanoparticles concentration, while for water-ethanol droplets, it reached a plateau and slightly decreased after 0.6 wt% nanoparticle loading. We proposed correlations for the retention force factor and critical angle and found that evaporating droplets with nanoparticle loading exhibited richer hydrothermal waves. This study is the first attempt to investigate the retention force factor for droplets loaded with nanoparticles on an inclined substrate.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Engineering, Chemical
M. Janocha, E. Tsotsas
Summary: The experimental investigation focused on the build-up of small coating layers from deposited droplets dried under forced convection. The evolution from single droplet residue to multi-deposit coating layer, as well as the development of porosity during incremental layer formation, were analyzed. The study compared three model substances representing nano-and microsuspensions, as well as solutions, and investigated the morphologies, porosities, and characteristic phenomena of resulting layers obtained via sessile droplet drying on a flat, partially wetting substrate.
Article
Chemistry, Physical
Anton Starostin, Vladimir Strelnikov, Leonid A. Dombrovsky, Shraga Shoval, Oleg Gendelman, Edward Bormashenko
Summary: The shape of the freezing tip formed by water droplet crystallization shows universality and is not affected by cooling rate or substrate properties. The orientation of the freezing cone can vary, possibly due to changes in the direction of heat flux.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Nanoscience & Nanotechnology
Yuanchao Liu, Jie Pan, Guobin Zhang, Binbin Zhou, Zebiao Li, Pikting Cheung, Weiliang Wang, Yuying Zhu, Siyi Xiao, Lianbo Guo, Condon Lau
Summary: This article proposes a substrate-free strategy to suppress the coffee ring effect, enrich analytes, and self-assemble a signal-amplifying platform for multimode laser sensing. The platform can dramatically enrich analytes and enables ultrasensitive multimode laser sensing.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Thermodynamics
Simiao Fan, Wei Tong, Fei Duan
Summary: The research found that the TiO2 nanotube coating has a significant impact on pool boiling heat transfer, improving both heat transfer coefficient and critical heat flux, and enhancing bubble dynamics and effective rewetting of dry spots.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Acoustics
Alexandru Crivoi, Zheng Fan
Summary: The sound attenuation capabilities of a specific class of subwavelength sound barriers based on wall-embedded Helmholtz resonators and a ventilation duct were studied both theoretically and numerically. The research introduced a simple analytical expression for broadband integral transmission attenuation for this type of metasurface structures. The results showed that the sound blocking performance depended on the main operational frequency, thickness, and ventilation capacity of the structure, highlighting the trade-off between barrier performance and physical footprint.
Article
Thermodynamics
Govind Harikumar, Lu Shen, Kai Wang, Swapnil Dubey, Fei Duan
Summary: A transient simulation of a hybrid thermoacoustic system is used to study temporal evolution of flow structures as well as the velocity and temperature variations within the channels of the stack. The simulation results show the presence of a residual vortex layer inside the channel, and the velocity and temperature variations are more prominent at resonance frequencies.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Lu Shen, Junheng Ren, Fei Duan
Summary: Experimental investigations reveal the linkage of nonuniform interfacial temperature and flow field in an ethanol droplet evaporating on a heated substrate before the final phase of drying. The Benard-Marangoni instability is suggested to be responsible for the regular thermal patterns formed at the evaporating interface. The evolution of deformed Benard-Marangoni convection cells in the sessile droplet is solely dependent on the instant contact angle.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Polymer Science
Baris Burak Kanbur, Yi Zhou, Suping Shen, Kim Hai Wong, Charles Chen, Abe Shocket, Fei Duan
Summary: This study focuses on the manufacturing of plastic injection mold inserts with conformal cooling channels (CCCs) using metal additive manufacturing (MAM). The research includes computational simulations, performance assessments, and multiobjective optimization to achieve better cooling performance and thermal uniformity compared to traditional channels.
Article
Thermodynamics
Zhen Qin, Zheng Hua Low, Chenzhen Ji, Fei Duan
Summary: This research aims to validate the effect of the inclined angle of metal fins on PCM melting and evaluate the efficacy of angled fins in enhancing PCM melting in the LHTES system. Experimental results show that the inclined fins significantly influence the temperature evolution of solid PCM around the fins. Different inclined angles of fins have varying effects on the PCM melting time, with downward inclined fins being the most effective in reducing the melting time.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Energy & Fuels
Zhen Qin, Chenzhen Ji, Zheng Hua Low, Wei Tong, Chenlong Wu, Fei Duan
Summary: Waste heat recovery from industrial exhaust gases is crucial for reducing fuel consumption and improving energy efficiency. This study focuses on the effect of PCM container geometry on melting behavior and heat storage performance. The results show that a protruding-shaped container with high convection strength significantly improves PCM melting and thermal storage rates.
Article
Acoustics
Alexandru Crivoi, Liangfen Du, Zheng Fan
Summary: This study investigates the performance of a multilayer sound attenuating metamaterial with ventilation capacity based on arrays of wall-embedded Helmholtz resonators analytically, numerically, and experimentally. The sound attenuation in the audible range can be improved by using multiple layers with a unique peak resonance frequency assigned to each corresponding layer. However, trade-offs between thickness, ventilation capacity, operational frequency range, and integral sound attenuation exist. The simplicity of the structural design and theoretical methods make this proposed barrier a good candidate for applications with a known desired attenuation spectrum.
Article
Physics, Applied
Lu Shen, Junfei Tai, Alexandru Crivoi, Junfei Li, Steven Cummer, Zheng Fan
Summary: This paper investigates the mechanism of self-stabilizing, three-dimensional Mie particle manipulation in water via an acoustic tweezer with a single transducer. A carefully designed acoustic lens is attached to the transducer to form an acoustic vortex, which provides angular momentum on the trapped polymer sphere and leads to a fast-spinning motion. The spinning motion of the trapped sphere links the acoustic radiation force and hydrodynamic forces together, so that the sphere can spontaneously achieve new force balance and follow the translational motion of the acoustic tweezer. Non-spherical objects can also be manipulated by this acoustic tweezer.
APPLIED PHYSICS LETTERS
(2023)
Article
Thermodynamics
Jing Zhou, Baris Burak Kanbur, Duc Van Le, Rui Tan, Fei Duan
Summary: With the rapid development of information technology, the increase in the number and scale of data centers highlights the importance of energy-saving cooling. This study proposes multi-criteria assessments to analyze the comprehensive interactions of internal and external factors in air-cooled data centers. The impacts of refrigerant charge, evaporation pressure control limits, and hot aisle containment on increasing supply air temperature are compared and analyzed. Overall, increasing the supply air temperature leads to a decrease in power usage effectiveness, but the effects of refrigerant charge and evaporation pressure control vary depending on the thermoeconomic aspects.
Article
Thermodynamics
Li Yi, Fei Duan, Minqiang Pan
Summary: This paper proposes an immersion spray array cooling vapor chamber (ISVC) for high-power electronic devices and conducts experimental and numerical studies on thermal performance and flow pattern. It is shown that increasing the inlet temperature of the coolant facilitates the heat transfer performance and temperature uniformity of the ISVC within the safe working temperature range of electronic devices. The ISVC achieves enhanced heat transfer capacity and temperature uniformity with larger inlet flow rates, compared to existing integrated heat sink combined vapor chamber and array jet impingement. The operating limit heating power of the ISVC is increased by at least 68%.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Engineering, Marine
Yuqing Hou, Hui Li, Hong Chen, Shengnan Shen, Fei Duan, Wei Wei, Jiayue Wang, Yicang Huang, Xiawei Guan, Yinghao Liao
Summary: This study proposes a novel SEConv1D framework for predicting the hydrodynamic characteristics of unidentified underwater vehicles. The framework combines Conv1D and SENet, and uses a hydrodynamic dataset based on CFD that is verified by experiments. The results show that the framework can accurately predict the total resistance coefficient (Cd) of REMUS UUV and SUBOFF AFF-1, with a small error compared to experimental data and significant reductions in error compared to other popular network models.
Article
Chemistry, Physical
Jiaxing Song, Mengying Liu, Xiangchao Ma, Quanwei Tian, Jingkai Feng, Xiting Zhong, Fei Duan
Summary: The thermal decomposition behaviors of alpha (α) and beta (13) manganese dioxide (MnO2) nanorods are investigated. Differential scanning calorimeter and thermogravimetric analysis are used to study the thermal process difference. X-ray diffraction analysis and scanning electron microscope are employed to examine crystal structures and morphologies at different temperatures. The results show that α-MnO2 nanorods have better thermal resistance than 13-MnO2, which is important for the selection of thermal stable materials in electrochemistry industries and energy materials application.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Biochemical Research Methods
Wenhan Zhao, Xiaopeng Shang, Boran Zhang, Dan Yuan, Binh Thi Thanh Nguyen, Wenshuai Wu, Jing Bo Zhang, Niancai Peng, Ai Qun Liu, Fei Duan, Lip Ket Chin
Summary: This study systematically investigates the flow transition process in the hydrodynamic focusing mechanism, revealing the transition from the squeezed focusing state to the over-squeezed anti-focusing state. The recovery rate of cell analysis can be maintained by limiting the Reynolds number below 30. These findings provide new insights into microfluidic cytometric analyses with various applications in food safety, water monitoring, and healthcare sectors.
Article
Chemistry, Physical
Yilin Liu, Jincai Su, Fei Duan, Xin Cui, Weichao Yan, Liwen Jin
Summary: This paper investigates the micro-mechanism of enhanced water vapor separation using graphene oxide-polyvinyl alcohol (GO-PVA) nanocomposite membranes. The study reveals that embedding GO into a PVA matrix increases glass transition temperature and fractional free volume, leading to enhanced gas diffusion in the membranes. The interaction between polymer chains and GO nanoparticles promotes water vapor adsorption and inhibits nitrogen adsorption in the membranes. These findings provide a basis for optimizing and synthesizing gas separation membranes.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
