Article
Chemistry, Physical
Mohammad Abo Jabal, Ekhlas Homede, Anna Zigelman, Ofer Manor
Summary: The experiment found that the Marangoni vortices, temperature variations, and wetting dynamics in sessile drops all vary concurrently in time and with the initial composition. In particular, maximum intensity levels of these phenomena were observed when the initial toluene proportion in the drops was 60%.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Mechanics
Linfeng Piao, Hyungmin Park
Summary: This study experimentally investigates the interfacial instabilities in a cylindrical container oscillating about its axis with two immiscible liquids, oil and water. The thresholds for the onset of different instabilities responsible for each regime are presented by the amplitude and frequency of rotation, with viscosity playing an important role in shaping the boundary of SD and multiple-droplet regimes.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Polymer Science
Yichuan Zhang, Hanqi Zhang, Mingming Guo, Joel De Coninck, David Seveno
Summary: In this study, the reactive wetting dynamics of molten maleic anhydride-grafted polypropylene (MA-g-PP) liquids were modeled using molecular-kinetic theory (MKT). The dependencies of contact line friction (zeta) and viscosity (eta) were compared for reactive and nonreactive wetting polymer systems. The reactive wetting system showed a nonlinear relationship, unlike the linear dependencies observed in nonreactive wetting systems. The formation of a new interface and entanglements of polymer chains in the chemistry-affected regime contribute to the dependence of zeta on eta in the capillary regime.
Article
Engineering, Petroleum
Jianjun Zhu, Hanjun Zhao, Guangqiang Cao, Hattan Banjar, Haiwen Zhu, Jianlin Peng, Hong-Quan Zhang
Summary: This paper introduces a new rheology model to predict the effective viscosity of oil-water emulsions and integrates it into the mechanical model of ESP boosting pressure, resulting in accurate predictions. Experimental data validation shows that the model's prediction error for ESP boosting pressure is less than 15%.
Article
Multidisciplinary Sciences
Masatoshi Ohashi, Atsushi Toramaru, Atsuko Namiki
Summary: Understanding the dynamics of growth-driven coalescence is crucial in various fields of natural science and engineering. In this study, we experimentally and theoretically investigate the coalescence of two growing bubbles in a Hele-Shaw cell, and find that the film capillary number plays a crucial role in determining the bubble distortion.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Physical
Guotao Zhang, Weijie Cai, Baohong Tong, Yanhong Sun, Enzhu Hu
Summary: In this paper, the gas-liquid two-phase flow behavior in unsaturated pores of porous self-lubricating materials with different wettability was investigated. The results help to clarify the two-phase flow mechanism within unsaturated pores and provide guidance for the self-lubrication design of porous materials.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Mechanics
Alireza Mohammad Karim, Wieslaw J. Suszynski, Saswati Pujari, Lorraine F. Francis, Marcio S. Carvalho
Summary: The rheological characteristics of liquids play a critical role in the flow near dynamic contact lines. Effects of shear thinning and extensional thickening on liquid contact line dynamics in the curtain coating of polymer solutions were experimentally studied. Critical web speeds for heel formation and air entrainment were compared to behavior of a Newtonian liquid, with contact line dynamics described using dimensionless parameters.
Article
Mechanics
C. Ruyer-Quil, D. Bresch, M. Gisclon, G. L. Richard, M. Kessar, N. Cellier
Summary: A mathematical and numerical framework is proposed to compute the displacement and merging dynamics of sliding droplets under the action of a constant shear exerted by a gas flow. The model includes surface tension with the full curvature of the free surface, shallow-water evolution equations, and an additional quantity taking into account capillary effects and enstrophy. The model is hyperbolic and considers the effect of viscosity and shear stress. The model is completed with a disjoining pressure formulation that accounts for the hysteresis of the static contact angle.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Mechanics
Fei Wang, Haodong Zhang, Yanchen Wu, Britta Nestler
Summary: In this study, a thermodynamically consistent diffuse interface model is proposed to describe the wetting effect for ternary fluids. The model is validated by simulating the equilibrium contact angle and thermodynamic pressure, and different dynamic wetting flow patterns are demonstrated. Additionally, the evaporation process of a ternary droplet is modeled and the same power law as previous experiments is obtained. The model allows for the modeling of the coffee-ring phenomenon by relating interfacial energies with surface composition.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Mechanics
Kevin R. Murphy, Jonathan B. Boreyko
Summary: When a sessile droplet contacts an opposing solid surface, the droplet can transfer based on wettabilities and surface velocity. This study used high-speed imaging to capture the transfer process from a solid substrate to a porous surface, varying parameters such as wettability, pore size, droplet volume, and working fluid. The transfer process is divided into wetting and wicking regimes, with wicking being significantly longer than wetting. The wetting regime has two sub-regimes, donor-independent and donor-dependent, while the wicking regime follows Darcy's law to complete the transfer.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Mechanics
Ehud Yariv
Summary: The shape of a sessile drop on a horizontal substrate is determined by the Bond number and the contact angle. For small contact angles, the drop shape can be approximated as a pancake, with capillary forces mainly concentrated near the edge. However, at a specific Bond number, the drop shape transitions to a spherical cap.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Mechanics
Vanessa R. Kern, Cathy Jin, J. B. Bostwick, P. H. Steen
Summary: This study investigates the deposition of a falling drop during oblique impact and demonstrates that post-impact observations of the frequency spectrum and energy partition can be used to determine the drop's characteristics and wetting properties.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Mechanics
D. Ding, J. B. Bostwick
Summary: This study investigates the frequency spectrum of pressure disturbances in drop-on-demand printing applications, which is influenced by the static contact angle and an empirical constant relating the reservoir pressure to volume exchanged. Instabilities in axisymmetric and non-axisymmetric modes are found to be related to center-of-mass motions, and the model parameters affect the spectral degeneracy of the Rayleigh drop modes.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Mechanics
Peter D. Hicks
Summary: The application of Wagner theory to non-flat droplet impacts on continuous substrates is studied in this paper. Both single and double impacts are analyzed, and the effect of separation between impact sites on the free surface, loads, and moments is evaluated. The formation and saturation of voids between the droplet and substrate are also investigated. The evolution of the free surface and the influence of periodic roughness on the contact line are examined. Results show that double impacts enhance liquid penetration and increase load and moment on the substrate.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Mechanics
Sheng Xu, Wenqi Fan, Wangxia Wu, Haocheng Wen, Bing Wang
Summary: In this study, the wave converging phenomena inside a two-dimensional water column impacted by different curved shock waves is investigated using theoretical ray analysis and numerical simulations. The results show that both the first and second reflected waves focus inside the water column regardless of the incident shock wave shape. The effects of the incident shock wave intensity on pressure variations at focus points are also examined.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Materials Science, Coatings & Films
Chen Feng, Michael Gibbons, Sanjeev Chandra
JOURNAL OF THERMAL SPRAY TECHNOLOGY
(2019)
Article
Thermodynamics
Chen Feng, Sanjeev Chandra
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2019)
Article
Mechanics
D. J. Bouchard, S. Chandra
Article
Chemistry, Applied
A. Dalili, K. Sidawi, S. Chandra
JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH
(2020)
Article
Chemistry, Applied
Marina Curak, Nazli Saranjam, Sanjeev Chandra
PROGRESS IN ORGANIC COATINGS
(2019)
Article
Thermodynamics
C. Feng, M. J. Gibbons, M. Marengo, S. Chandra
APPLIED THERMAL ENGINEERING
(2020)
Article
Thermodynamics
N. Lipson, S. Chandra
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2020)
Article
Engineering, Mechanical
D. J. Bouchard, S. Chandra
EXPERIMENTS IN FLUIDS
(2020)
Article
Materials Science, Coatings & Films
Sudarshan Devaraj, Bobby Anand, Michael Gibbons, Andre McDonald, Sanjeev Chandra
SURFACE & COATINGS TECHNOLOGY
(2020)
Article
Materials Science, Multidisciplinary
Michael J. Gibbons, Saeid Nikafshar, Tina Saravi, Katie Ohno, Sanjeev Chandra, Mojgan Nejad
Article
Chemistry, Applied
K. Sidawi, P. Moroz, S. Chandra
Summary: The experimental study focused on the effects of rotational speed of the bell-cup, paint flow rate, and shaping air flow rate on droplet size and surface coverage. The results showed that increasing rotational speed reduced droplet diameter but had little effect on coverage, while increasing paint flow rate and shaping air flow rate significantly increased surface coverage. The application of an electrostatic potential slightly enhanced surface coverage.
JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH
(2021)
Review
Materials Science, Coatings & Films
S. Devaraj, A. McDonald, S. Chandra
Summary: In this study, metallic coatings were successfully applied on porous polyethylene using a twin wire-arc spray process, without prior surface preparation, to form coatings with high adhesion strength compared to the ultimate fracture strength of the porous material. Porosity in the polymer helped to overcome the challenges of metallizing polyethylene and significantly reduce the weight of the polymer. These properties aided in fabricating an extremely lightweight, composite material with potential use in thermal management applications.
JOURNAL OF THERMAL SPRAY TECHNOLOGY
(2021)
Review
Materials Science, Textiles
Ariana Khakpour, Michael Gibbons, Sanjeev Chandra
Summary: This research investigated the rate of water vapor transmission through microporous nylon and nanofibrous Gore-Tex membranes, and explored the impact of pore blockage on the moisture diffusion rate through the membranes. Liquid contamination on the porous membrane was found to reduce moisture diffusion rate due to pore blockage, while water evaporation from the membrane's surface increased the mass of vapor diffusing through the membrane.
JOURNAL OF INDUSTRIAL TEXTILES
(2022)
Article
Materials Science, Coatings & Films
S. Yugeswaran, P. Amarnath, P. Ananthapadmanabhan, L. Pershin, J. Mostaghimi, S. Chandra, T. W. Coyle
Summary: In this study, porous Inconel 625 coatings were produced using dual injection plasma spraying, with polyester powder as the pore former. After heat treatment, the coatings were found to have porosity levels ranging from 4+/-2% to 48+/-9%. Results showed that as the porosity level in the coating microstructures increased, the thermal conductivity decreased and oxidation rate increased.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Engineering, Mechanical
K. Sidawi, P. Moroz, S. Chandra
Summary: The study investigated the atomization mechanism of an Electrostatic Rotating Bell atomizer, focusing on the impact of serrations at the bell-cup's edge on fluid behaviour. Results showed that serrated edges caused the fluid to be ejected as thin ligaments, while non-serrated edges resulted in sheet-like ejection. The SMD decreased with increasing angular frequency of the bell-cup, and sprays generated by different bell-cups at various angular frequencies showed equal performance when plotted against the stretching rate.
EXPERIMENTS IN FLUIDS
(2021)
