Review
Mechanics
Stephen K. Wilson, Hannah-May D'Ambrosio
Summary: The evaporation of a sessile droplet of liquid is a complex and multifaceted fundamental topic. It has drawn significant multidisciplinary research efforts in recent decades due to its key role in numerous physical and biological processes. This review focuses on the insights gained from simple mathematical models and discusses potential future directions in the field.
ANNUAL REVIEW OF FLUID MECHANICS
(2023)
Article
Mechanics
Abhishek Kaushal, Vishwajeet Mehandia, Purbarun Dhar
Summary: This article investigates the morphing of evaporation kinetics of paramagnetic saline sessile droplets in the presence of a magnetic field stimulus, showing that the evaporation rates are significantly augmented by the magnetic field strength, and the thermo-solutal advection within the droplets is enhanced. The magneto-thermal and magneto-solutal modes of internal ferrohydrodynamics are revealed to be the dominant mechanisms behind the augmented evaporation dynamics, with experimentally obtained internal velocities in excellent compliance with model predictions. These findings have important implications for magnetic field-modulated microfluidic thermal and species transport systems.
Article
Mechanics
Desheng Chen, Tingting Wang, Lining Ming, Man Qiu, Zhe Lin
Summary: This paper investigates the collision of moving droplets with sessile droplets using high-speed photography. The main characteristics of the collision phenomena under different collision speeds and volume ratios are quantified, and the phenomena are explained from an energy analysis perspective. The findings are significant for solving practical engineering problems and improving equipment operation stability.
Article
Chemistry, Physical
V. Gigiberiya, M. Manilo, N. Lebovka
Summary: The drying process of sessile droplets of binary colloidal mixtures of carbon nanotubes and Laponite has been studied. Different zones, including a transparent center, a gray outer ring, and a thin outer boundary ring, were observed. The effects were explained by considering the influence of Laponite on the dispersion of carbon nanotubes in aqueous systems.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2024)
Article
Chemistry, Multidisciplinary
Hongyue Chen, Yongjian Zhang, Heyi Wang, Xin Dong, Duyang Zang
Summary: Controlled buckling of colloidal droplets via acoustic levitation is important in pharmaceutical, coating, and material self-assembly. This study investigated the evaporation process of PTFE colloidal droplets with different particle concentrations under acoustic levitation and observed surface invagination. Higher particle concentration led to invagination on the upper surface, forming a bowl-shaped structure, while lower particle concentration resulted in invagination on both upper and lower surfaces, forming a doughnut-like structure. The hollow cavity on the droplet surface absorbed sound energy and caused positive acoustic radiation pressure, promoting the invagination process.
Article
Thermodynamics
Liansheng Liu, Xuanchen Liu, Wenqi Jia, Wenjia Ren, Liang Tian, Runze Duan
Summary: This study investigates the evaporation characteristics of droplets attached to a high temperature wall, revealing the intense evaporation process in the boiling regime and the transition from static evaporation to nucleate boiling. The study verifies the feasibility of numerical simulation for studying droplet evaporation in the boiling regime, which is consistent with experimental results.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
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, Multidisciplinary
Sanghamitro Chatterjee, Janani Srree Murallidharan, Rajneesh Bhardwaj
Summary: In this study, we experimentally and theoretically investigate the spreading, evaporation, and dried deposits of colloidal particle-laden droplets on a surface in an alcohol vapor environment. We find that the particle size plays a crucial role in the behavior of the droplet, and efficient self-sorting of bidispersed particles is achieved.
Article
Thermodynamics
Shangpei Dai, Xuhong Jia, Xiaoyu Zhang, Jing Tang, Junhao Ma, Quanyi Liu, Yulong Zhu
Summary: This study experimentally investigated the evaporation behavior of different fuel droplets on hot surfaces, revealing various thermal patterns and heat transfer mechanisms. The results showed that the evaporation rate of droplets is largely determined by the saturation vapor pressure.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Mechanics
Cosimo Brondi, Nicolo G. Di Novo, Nicola M. Pugno, Giuseppe Mensitieri, Massimiliano Fraldi
Summary: The spread of respiratory diseases through saliva droplets can be affected by the water evaporation process, which influences virus viability. The drying time of virus-laden droplets is influenced by environmental conditions, physical properties, and wetting regime. By simulating the evaporation behavior and drying time of aqueous sodium chloride droplets and a surrogate virus (MS2) under different wetting regimes and ambient conditions, the importance of wetting regimes on evaporation behavior and drying time was revealed.
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
Thermodynamics
Sanjeev Kumar, Marc Medale, David Brutin
Summary: A numerical model is developed and validated to understand the evaporation process of sessile drops. The study reveals a correlation between substrate temperature and evaporation rate, and analyzes the flow motion to investigate the effects of the Marangoni effect and secondary instabilities on the evaporation rate.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Yang Shen, Feng Kang, Yongpan Cheng, Kai Zhang, Yi Sui
Summary: In this study, theoretical analysis and numerical simulation were conducted to investigate the evaporation of droplets with coupled flow, heat, and vapor transfer fields. The findings show that droplet evaporation can be deteriorated by evaporative cooling effect, while enhanced by internal thermocapillary convection flow and external natural convection. Additionally, a correction factor was proposed to quantify the deviation of actual evaporation rates from those predicted by the isothermal model.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Chemistry, Physical
A. W. Zaibudeen, Ranjini Bandyopadhyay
Summary: This study investigates the correlation between the evaporation dynamics of a gold nanorod dispersion droplet and the formation of a coffee stain with distinct microstructures. The droplet retraction, pinning, and quick evaporation during different drying phases are found to be clearly correlated with the aggregation regions in the coffee stain. The unique assemblies of gold nanorods in the coffee stain edge have the potential to be used for plasmonic sensors, while the large clusters of nanorods outside the stain could enhance the fluorescence of low quantum yield molecules. Controlling the evaporating droplet kinetics can tailor the solute deposition pattern.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Thermodynamics
Saravanan Balusamy, Sayak Banerjee, Kirti Chandra Sahu
Summary: The spreading of respiratory diseases like COVID-19 from contaminated surfaces is largely influenced by the drying time of virus-containing droplets, which is affected by environmental conditions and physical properties. Respiratory droplets contain salt, protein, and surfactant in addition to water, which are expected to impact evaporation significantly.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Chemistry, Physical
Laxman K. Malla, Rajneesh Bhardwaj, Adrian Neild
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2020)
Article
Chemistry, Multidisciplinary
Sagar N. Agnihotri, Mohammad Reza Raveshi, Rajneesh Bhardwaj, Adrian Neild
Article
Engineering, Manufacturing
Ankit Kumar, Rajneesh Bhardwaj, Suhas S. Joshi
MACHINING SCIENCE AND TECHNOLOGY
(2020)
Article
Mechanics
Manish Kumar, Rajneesh Bhardwaj, Kirti Chandra Sahu
Article
Engineering, Mechanical
Rahul Mishra, Atul Soti, Rajneesh Bhardwaj, Salil S. Kulkarni, Mark C. Thompson
JOURNAL OF FLUIDS AND STRUCTURES
(2020)
Article
Mechanics
Rajneesh Bhardwaj, Amit Agrawal
Article
Mechanics
Amit Agrawal, Rajneesh Bhardwaj
Article
Engineering, Mechanical
Rahul Mishra, Rajneesh Bhardwaj, Salil S. Kulkarni, Mark C. Thompson
Summary: This study investigates the effect of structural nonlinearity on the vortex-induced vibration of a rigid circular cylinder at a fixed mass ratio of m* = 2.546 and Re = 150. By changing the damping ratio and nonlinearity strength, the response of the cylinder to VIV is examined. Increasing system nonlinearity leads to richer spectral content in displacement and force signals, indicating a potential benefit for energy extraction applications.
JOURNAL OF FLUIDS AND STRUCTURES
(2021)
Article
Engineering, Multidisciplinary
Amitosh Dash, Prathamesh G. Bange, Nagesh D. Patil, Rajneesh Bhardwaj
SADHANA-ACADEMY PROCEEDINGS IN ENGINEERING SCIENCES
(2020)
Article
Mechanics
Sanghamitro Chatterjee, Janani Srree Murallidharan, Amit Agrawal, Rajneesh Bhardwaj
Summary: The study found that the survival time of coronavirus on porous surfaces is shorter than that on impermeable surfaces due to the changes in the evaporation mechanism and mass loss of droplets in porous materials. Capillary imbibition process and faster film evaporation on porous surfaces play a key role in the faster decay of the virus.
Article
Multidisciplinary Sciences
Javed Shaikh, Nagesh D. Patil, Atul Sharma, Rajneesh Bhardwaj
Summary: The study focuses on the partial/complete coalescence dynamics of a droplet surrounded by air over a horizontal pool of the same liquid. Both experimental and numerical studies were carried out for droplets of constant diameter in isopropanol and glycerol. The numerical study, particularly on isopropanol droplets, investigated the influence of droplet diameter and surface tension coefficient on coalescence dynamics. The study presented a flow and vorticity dynamics-based quantitative evidence of the coalescence mechanism, identified critical values for transition from partial to full coalescence, and demonstrated excellent agreement with existing literature correlations for transition boundaries under varying droplet parameters.
SN APPLIED SCIENCES
(2021)
Article
Thermodynamics
Hemanshul Garg, Atul Kumar Soti, Rajneesh Bhardwaj
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2020)
Article
Materials Science, Multidisciplinary
Ankit Kumar, Rajneesh Bhardwaj, Suhas S. Joshi
ADVANCES IN MATERIALS AND PROCESSING TECHNOLOGIES
(2020)
Article
Mechanics
Rajneesh Bhardwaj, Amit Agrawal
Article
Multidisciplinary Sciences
Anup Kundu, Atul K. Soti, Hemanshul Garg, Rajneesh Bhardwaj, Mark C. Thompson
SN APPLIED SCIENCES
(2020)