Review
Materials Science, Multidisciplinary
Hamed Aghajani Derazkola, Eduardo Garcia Gil, Alberto Murillo-Marrodan, Damien Meresse
Summary: This review discusses the evolution of microstructure and mechanical behavior of high-chromium content stainless steels during hot deformation, highlighting the process of continuous dynamic recrystallization and the formation of new ultrafine grains regardless of stacking fault energies. Limited understanding of flow stress and microstructure changes during hot forming of martensitic stainless steels is noted, emphasizing the need for further research in this area. Recent studies have explored the relationship between microstructural changes and mechanical properties under thermomechanical conditions, shedding light on the dynamic recrystallization behavior of this type of steel during the deformation phase.
Article
Thermodynamics
Zhongyi Liu, Siqi Li, Xiaolong Pan, Haisheng Fang
Summary: The paper presents a numerical model based on the SPH method to predict the outcome of nanofluid droplets in detail. The model takes into consideration the surface tension of droplets and the properties of nanofluids. The results show that the SPH model is capable of predicting the evolution of droplet surface and thermal distribution.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Chemistry, Physical
Johnathan Hoggarth, Jean-Christophe Ono-dit-biot, Kari Dalnoki-Veress
Summary: When a pile of sand is poured out of a funnel onto a surface, the friction between the grains allows the pile to grow taller and spread out. In this study, we investigated a similar process using a two-dimensional pile of oil droplets. Unlike sand, the droplets have buoyancy and adhesion, and friction is negligible. As the pile grows, it reaches a critical height at which it spreads out across the boundary. Interestingly, although the behavior is granular, the growth process is similar to that of a continuous liquid. This can be described by a granular capillary length, which determines the critical height of the pile based on the balance between buoyancy and adhesion.
Review
Chemistry, Physical
Alexandre M. Emelyanenko, Ludmila B. Boinovich
Summary: The dispersion of nanodispersions provides an inexpensive and convenient solution to improve the functional properties of base fluids and solve various industrial and technical problems. This review aims to highlight recent important results regarding wetting and spreading processes of nanofluids on different surfaces.
CURRENT OPINION IN COLLOID & INTERFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Carolina Hermida-Merino, Fernando Pardo, Gabriel Zarca, Joao M. M. Araujo, Ane Urtiaga, Manuel M. Pineiro, Ana B. Pereiro
Summary: In this study, polymeric membranes functionalized with ILs and xGnP were developed for gas separation, showing high compatibility and good mixing between the polymer and IoNF. Characterization techniques like TGA, SEM, and FTIR were used to determine the stability, morphology, and interactions of the membranes. The gradual decrease in melting point and complete disappearance of crystallinity with increasing IL content demonstrate the effectiveness of these functionalized membranes.
Article
Engineering, Marine
Woongshik Nam, Mojtaba Mokhtari, Jorgen Amdahl
Summary: The study investigates the impact of LNG spills on the integrity of marine steel structures, conducting thermal-structural analysis and pool boiling tests on steel specimens under non-spreading cryogenic spills. The research also discusses the effect of surface roughness on cooling rates and boiling regimes. Numerical simulations of the experiments resulted in a heat flux curve for EH36 steel-LN2 pool boiling.
SHIPS AND OFFSHORE STRUCTURES
(2022)
Article
Thermodynamics
Seddik Kherroubi, Youb Khaled Benkahla, Nabila Labsi, Karim Ragui, Abdelghani Bensaci, Abdelkader Boutra, Seif-Eddine Ouyahia, Mandi Benzema
Summary: This paper focuses on the three-dimensional fluid flow and heat transfer of Al2O3 nanofluid within ventilated enclosures, considering the impact of main parameters such as Reynolds number and nanoparticles volume fraction. The results show that heat exchange rate increases and pressure drop decreases as Reynolds number increases, with the two-dimensional model valid for low Reynolds numbers. Additionally, a correlation for the pressure drop is obtained in polynomial form.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Engineering, Geological
Julia Leuthold, Eleni Gerolymatou, Maximiliano R. Vergara, Theodoros Triantafyllidis
Summary: Experimental studies on soft porous rocks showed that discrete compaction bands form under high confining stresses, while shear bands form under low confining stresses. Axial permeability decreases with increasing axial strain, with a maximum permeability decrease of three orders of magnitude at 40% axial strain.
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Engineering, Geological
Yang Xiao, Zengchun Sun, Ninghao Wang, Haotian Guo, Huanran Wu, Minqiang Meng
Summary: This study investigates the shear responses and thermal effects of binary mixtures of quartz sand and kaolin clay using temperature-controlled triaxial drained compression tests. The results demonstrate that confining pressure, fine content, and temperature considerably influence the thermo-mechanical properties of the mixtures.
Article
Chemistry, Physical
Gabriela Huminic, Angel Huminic, Claudiu Fleaca, Florian Dumitrache, Ion Morjan
Summary: The study focuses on the development of new hybrid nanofluids with distinct iron-based and silicon nanophases through experimental analysis of dynamic viscosity at different temperatures and concentrations, leading to the proposal of new correlations. The findings contribute to understanding the mechanisms of viscosity changes and finding preparation methods for long-term stability.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Engineering, Mechanical
Marthe Braut, Luis Gonzalez-Fernandez, Anna Kosinska, Yaroslav Grosu, Pawel Kosinski
Summary: This research found that nanofluids containing 1.33 wt% TiO2 have erosive effects on copper and plastic surfaces, while causing nanoparticle deposition on rubber surfaces.
Article
Optics
Suning Zhao, Zhengdong Tan, Haiying Wang, Ming Gao
Summary: By developing a new integrating sphere platform to simulate laser soldering, it was found that the soldering process can be divided into 5 stages. It was discovered that LR is not directly correlated to the shape or temperature of the solder paste, but rather depends on laser reflections, melt surface reflection, and heat conduction.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Energy & Fuels
Xiahua Zuo, Weimin Yang, Meinong Shi, Hua Yan, Changfeng Guan, Sida Wu, Zhenghe Zhang, Xibiao Li, Zhao Li
Summary: In this study, lampblack ink was used as a heat collecting medium for photothermal conversion. The results showed that the lampblack ink nanofluids had better photothermal conversion performance compared to deionized water, with a maximum efficiency of 76.7% under a solar simulator. The study provides new insights for the application of photothermal technologies in addressing energy shortages effectively and at a low cost.
Article
Energy & Fuels
Patrick Osswald, Julia Zinsmeister, Trupti Kathrotia, Maira Alves-Fortunato, Victor Burger, Rina van der Westhuizen, Carl Viljoen, Kalle Lehto, Reetu Sallinen, Kati Sandberg, Manfred Aigner, Patrick Le Clercq, Markus Kohler
Summary: A series of three interrelated parts present an experimental and numerical study on detailed combustion chemistry and pollutant formation using a comprehensive collection of technical aviation fuels. The study focuses on the impact of complex chemical fuel composition on intermediate species pool and the relationship between soot precursor concentration and degree of unsaturation, hydrogen content, and naphthalene content.
Article
Thermodynamics
Xiangyu Tong, Dong Li, Ruitong Yang, Muslum Arici, Yangyang Wu, Changyu Liu, Cagatay Yildiz
Summary: Paraffin, as a phase change material (PCM), is widely used in solar energy storage and utilization. However, its poor photothermal properties restrict its application due to low thermal conductivity and weak spectral absorption. In this study, a hybrid PCM-based nanofluid was developed by incorporating zinc (Zn) and zinc oxide (ZnO) nanoparticles into paraffin wax, and its thermal and optical properties were experimentally investigated. The results showed that the addition of Zn and ZnO nanoparticles improved the thermal conductivity and specific heat capacity of the nanofluid. However, the transmission of the nanofluid decreased with increasing optical length and nanoparticles concentration. The Zn-ZnO/paraffin hybrid nanofluid exhibited enhanced photothermal properties at lower concentrations and higher irradiance range, with a maximum photothermal conversion efficiency of 42.97%.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Chemistry, Physical
Alex Nikolov, Darsh Wasan, Jongju Lee
ADVANCES IN COLLOID AND INTERFACE SCIENCE
(2018)
Article
Chemistry, Physical
Heon Ki Cho, Alex D. Nikolov, Darsh T. Wasan
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2018)
Article
Chemistry, Physical
Alex Nikolov, Pingkeng Wu, Darsh Wasan
ADVANCES IN COLLOID AND INTERFACE SCIENCE
(2019)
Article
Chemistry, Physical
Alex Nikolov, Darsh Wasan
ADVANCES IN COLLOID AND INTERFACE SCIENCE
(2019)
Article
Chemistry, Physical
Alex Nikolov, Pingkeng Wu, Darsh Wasan
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2019)
Article
Chemistry, Physical
Alex Nikolov, Sohail Murad, Darsh Wasan, Pingkeng Wu
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2020)
Review
Chemistry, Physical
Alex D. Nikolov, Darsh T. Wasan, Pingkeng Wu
Summary: This article reviews recent advances on the mechanisms behind colloidal nano altered wetting phenomenon, focusing on the importance of thermal and solutal Marangoni flow in the coffee ring phenomenon, as well as the role of particle self-assembly and Marangoni flow in superspreading. While the exact mechanisms behind superspreading are not fully understood, it is suggested that Marangoni flow plays a crucial role in this process.
CURRENT OPINION IN COLLOID & INTERFACE SCIENCE
(2021)
Article
Green & Sustainable Science & Technology
Dan P. Lambert, Alex D. Nikolov, Darsh T. Wasan, Matthew S. Williams, Anthony M. Howe, Wesley H. Woodham
Summary: Legacy radioactive waste in South Carolina poses a significant environmental challenge, with approximately 35 million gallons still needing treatment. A new defoamer has been developed to address this issue, providing a more efficient and safer processing method.
ENVIRONMENTAL PROGRESS & SUSTAINABLE ENERGY
(2021)
Article
Chemistry, Physical
Alex Nikolov, Darsh Wasan
Summary: Understanding the stability and demulsification of water-in-oil emulsion films is important for science and technology, but remains challenging. This study aims to investigate the role of asphaltene-resin nanoparticles in bitumen film and emulsion stability, proposing methods for optimizing demulsifier performance.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Review
Chemistry, Physical
Alex D. Nikolov, Darsh T. Wasan, Pingkeng Wu
Summary: This work reviews the origins, similarities, measurement techniques, and differences of the solvation and nano-colloidal oscillatory structural forces in confined domains. It also highlights the critical roles of these forces on the wetting and spreading of simple and complex liquids on solid surfaces. Experimental observations and computational methods were used to investigate the structural transitions of particles under increasing confinement.
CURRENT OPINION IN COLLOID & INTERFACE SCIENCE
(2022)
Article
Chemistry, Physical
Alex D. Nikolov, Darsh T. Wasan
Summary: This study reveals that particles in a foam film formed from complex fluids self-organize into layers as the film thins. The thinning process of the film occurs in a stepwise manner, with the film's area playing a crucial role. A particle dislocation-diffusion-osmotic pressure model is proposed to explain the mechanism of the film's stepwise thinning.
ADVANCES IN COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Physical
Jongju Lee, Alex D. Nikolov, Darsh Wasan
Summary: The research discusses the history and recent advances in the measurement and modeling of oscillatory structural forces (OSF), including the use of advanced techniques and Henderson's theory. It also proposes a method to extend the theory to model the layer and in-layer structural transition of a capillary system.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Chemistry, Physical
Alex Nikolov, Jongju Lee, Darsh Wasan
Summary: This paper explores two models for dispersion stability theory. The classical DLVO model considers the attractive London-van der Waals interaction and electrostatic repulsive interaction in the frame of the Debye-Huckel theory. The solvent, an aqueous electrolyte solution, is treated as the continuous phase. Henderson and Lozada-Cassou (HC) use statistical mechanics to calculate the film free energy and predict dispersion stability by considering hard spheres immersed in a fluid of dispersed small particles. HC's theoretical approach also explains the stability of complex fluid films and discusses the differences between solvation oscillatory layering forces and colloidal oscillatory structural forces. The application of the DLVO model to dispersion stability is critically reviewed, and the role of nanobubbles in dispersion stability is discussed.
ADVANCES IN COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Physical
Jongju Lee, Sohail Murad, Alex Nikolov
Summary: This article presents a brief history of the development of ballpoint/rollerball and fountain pens, comparing their operational principles. The writing manner of ballpoint/rollerball pens was monitored and recorded using lens end fiber optics, while the ball rotation rate was measured with a piezoelectric disk oscilloscope technique. The role of ink chemistry in wetting phenomenon was explained, along with methods for studying and evaluating ink-film-ball-paper surface wetting.
COLLOIDS AND INTERFACES
(2023)
Review
Chemistry, Physical
Pingkeng Wu, Alex D. Nikolov, Darsh T. Wasan
Summary: Nanofluids have promising applications in enhanced oil recovery due to their efficient oscillatory structural forces, which promote wetting and spreading on solid surfaces, enhancing oil separation from reservoirs.
COLLOIDS AND INTERFACES
(2022)