We predict and analyze the drying time of respiratory droplets from a COVID-19 infected subject, which is crucial to infect another subject. Drying droplet predicted by using diffusion-limited evaporation model for sessile placed on partially wetted surface with pinned contact line. The variation in volume, angle, ambient temperature, humidity are considered. chances survival virus present based lifetime under several conditions find that strongly affected each these parameters. magnitude...

The value of tangential momentum accommodation coefficient (TMAC) is required while prescribing the boundary condition for flow gases in slip and transition regimes. precise determination its important several other applications as well. This article reviews experimental techniques employed by researchers over decades to measure this values reported literature, with relevance calculation velocity. review shows that TMAC dependent on a number parameters including nature gas, pressure material...

Abstract In this research work, we present a simple and efficient passive microfluidic device for plasma separation from pure blood. The microdevice has been fabricated using conventional photolithography technique on single layer of polydimethylsiloxane, extensively tested whole blood enhanced (upto 62%) hematocrit levels human employs elevated dimensions about 100 μm; such ensure clog-free operation the is relatively easy to fabricate. We show that our achieves almost 100% efficiency...

Motivated by the fact that drying time of respiratory droplets is related to spread COVID-19 [R. Bhardwaj and A. Agrawal, "Likelihood survival coronavirus in a droplet deposited on solid surface," Phys. Fluids

Previous studies reported that the drying time of a respiratory droplet on an impermeable surface along with residual film left it is correlated coronavirus survival time. Notably, earlier virus titer measurements revealed surprisingly less porous surfaces such as paper and cloth than surfaces. could not capture this distinct aspect media. We demonstrate how mass loss evaporation mechanism thin liquid are modified for media, which leads to faster decay While diffusion-limited governs from...

In this work, we estimate the probability of an infected person infecting another in vicinity by coughing context COVID-19. The analysis relies on experimental data Simha and Rao ["Universal trends human cough airflows at large distances," Phys. Fluids 32, 081905 (2020)] similarity Agrawal Bhardwaj ["Reducing chances COVID-19 infection a cloud closed space," 101704 to determine variation concentration aerosols with some distance from source. reveals within volume rapid exponential decay...

Flow transitions are an important fluid-dynamic phenomena for many reasons, including the direct effect on aerodynamic forces acting body. In present study, two-dimensional (2-D) and three-dimensional (3-D) wake of a NACA0012 airfoil studied angles attack in range $0^\circ \leq \alpha 20^\circ$ Reynolds numbers $500 {\textit {Re}} 5000$ . The study uses water-channel experiments 2-D 3-D numerical simulations based nodal spectral-element method, level-set function-based immersed-interface...

A coupled level-set and volume-of-fluid method is presented for modeling incompressible two-phase flows with surface tension. The algorithm conserves mass captures the complicated interfaces very accurately. planar simulation of bubble growth performed in water at near critical pressure different degrees superheat. effect superheat on frequency formation has been analyzed. In addition, film boiling refrigerant R134a far pressures. saturation also studied. deviation from periodic release...

In this paper, the low-Reynolds number ( Re = 80) flow around a row of nine square cylinders placed normal to oncoming is investigated using lattice-Boltzmann method. The effects cylinder spacing on are studied for diameter ratios 0.3 12. No significant interaction between wakes observed with spacings greater than six times diameter. At smaller spacings, regimes as revealed by vorticity field and drag coefficient signal are: synchronized, quasi-periodic chaotic. These shown result from...

The cough of a COVID-19 infected subject contaminates large volume surrounding air with coronavirus due to the entrainment in jet-like flow created by cough. In present work, we estimate this air, which may help us design ventilation closed spaces and, consequently, reduce spread disease. Recent experiments [P. P. Simha and S. M. Rao, “Universal trends human airflows at distances,” Phys. Fluids 32, 081905 (2020)] have shown that velocity cough-cloud decays exponentially distance. We analyze...

Antibacterial coatings are often employed to elastomer surfaces inhibit bacterial attachment. However, such approaches could lead increased antibiotic resistance. Surface micro-/nanotexturing is gaining significant attention recently, as it a passive approach reduce adhesion surfaces. To this end, work aims assess the anti-biofouling functionality of femtosecond laser-induced submicron topographies on biomedical Femtosecond laser processing was produce two types stainless-steel substrates....