Respiratory droplets-which may contain disease spreading virus-exhaled during speaking, coughing, or sneezing are one of the significant causes for spread ongoing COVID-19 pandemic. The droplet dispersion depends on surrounding air velocity, ambient temperature, and relative humidity. In a confined space like an elevator, risk transmission becomes higher when there is infected person inside elevator with other individuals. this work, numerical investigation carried out in three-dimensional...

A new cerium(III)-based coordination polymer, [Ce(HCOO)(2,5-pydc)] (where 2,5-pydc = 2,5-pyridinedicarboxylate), 1, has been fruitfully synthesized using the solvothermal method. single-crystal X-ray diffraction study established three-dimensional structure of compound 1. Ce3+ ions are in a tricapped trigonal prismatic geometry. The phase purity 1 confirmed by powder diffraction, thermogravimetric analysis, and IR spectroscopic studies. Aqueous dispersion gives luminescence emission at 350...

Efficient particle sorting in microfluidic systems is vital for advancements biomedical diagnostics and industrial applications. This study numerically investigates migration passive symmetric serpentine microchannels, leveraging inertial centrifugal forces label-free, high-throughput separation. Using a two-dimensional numerical model, dynamics were analyzed across varying flow rates, diameter ratios (1.2, 1.5, 2), channel configurations. The optimized geometry achieved separation...

In recent development, the type of dopants, strain, vacancies, and band alignment in reduced graphene oxide, namely, window, can be a promising candidate to exhibit high near-infrared light detection. this work, we delineate structural effects, in-plane hopping defects, vacancies that enhance p-type behavior nitrogen/oxygen functionalized oxide (NORG). The NORG-6/30 has been prepared from pyrazole at different time intervals (6-30 h). A combined spectroscopic approach ab initio calculation...

Abstract The current work uses computational simulations to study the effect of Reynolds number on phase-averaged velocity profiles and turbulence characteristics for environments with wave-current flow. presented model utilized a Reynolds-Averaged Navier-Stokes (RANS) solver, which is closed using K-ω Shear Stress Transport (SST) equations. volume fluid (VOF) method employed capture analyze wave related water surface dynamics. A new user-defined function created simulate waves, are then...

A Tb-doped Y-based MOF was constructed for simultaneous recognition of noxious anions HAsO₄²⁻, PO₄³⁻, MnO₄⁻, CrO₄²⁻ and Cr₂O₇²⁻ in water.

This study reports a detailed comparison of dispersed-phase holdup and onset different operating regimes in PSPC (pulsed sieve-plate column) PDDC disc-and-doughnut for 3 N nitric acid–30% tributyl phosphate (TBP) dodecane system. Experiments are performed 3-inch glass column with SS internals aqueous-continuous mode operation keeping O/A ratio at 1:3. The effects throughput (0.0097–0.0219 m/s) pulsing velocity (0.011–0.039 on studied compared. Holdup is found to be consistently more than...

Numerical simulations of liquid–liquid counter-current two-phase flow in pulsed disc and doughnut columns (PDDCs) are performed. The simulation methodology comprises two steps. In the first step, Euler–Euler method is used to obtain turbulent field. Turbulence simulated by using standard k-ε mixture model. dispersed phase assumed be monodispersed. second step solution species transport equation together with equations residence time distribution (RTD) continuous phase. RTD estimate axial...

The education sector has suffered a catastrophic setback due to the ongoing COVID pandemic, with classrooms being closed indefinitely. current study aims solve existing dilemma by examining transmission inside classroom and providing long-term sustainable solutions. In this work, standard 5 × 3 m3 is considered where 24 students are seated, accompanied teacher. A computational fluid dynamics simulation based on OpenFOAM performed using Eulerian–Lagrangian framework. Based stochastic...

A numerical analysis using OpenFOAM has been performed in this work to investigate the infection risk due droplet dispersal an enclosed environment resembling elevator, since such confined places is very high. The effect of two scenarios on dispersal, namely, quiescent and fan-driven ventilation, both subjected various climatic conditions (of temperature humidity) ranging from cold–humid (15 °C, 70% relative hot–dry (30 30% have studied. factor derived a dose–response model constructed upon...

In chemical industries, multiphase flows in a bubble column reactor are frequently observed. The nonlinearity associated with hydrodynamics, such as bubble-bubble and bubble-liquid interactions, gives rise to complex spatiotemporal patterns increased gas or liquid velocities, which extremely difficult model predict. the current study, we propose new, computationally efficient recurrence-based approach involving angular separation between suitably defined state vectors implement it on...

Micro-combustors, which are emerging as portable power sources, have serious flame stabilization issues due to enhanced heat losses. Hydrogen, an eco-friendly alternative conventional fossil fuels, can be a potential fuel for micro-combustors because of its high calorific value, leading energy density. In the present work, numerical simulations premixed lean (equivalence ratio = 0.5) hydrogen-air flames in 2 mm wide channel with three different wall materials (glass, steel, and aluminum)...

CFD simulations of pulsed disc and doughnut columns are performed to understand the effects operating geometric parameters on axial dispersion pressure drop in single-phase flow. have been carried out using a two-step approach. In first step, flow field is obtained by solving continuity momentum equations along with standard k–ε model turbulence. second species transport equation additionally solved obtain residence time distribution hence Peclet number coefficient. The computational...

Computational fluid dynamics – population balance (CFD-PB) simulations are performed to predict Sauter mean drop diameter and dispersed phase holdup for liquid–liquid two-phase flow in a pulsed disc doughnut column (PDDC). The continuity momentum equations of the two-phases along with standard k–ε mixture model turbulence an appropriate interphase exchange solved obtain temporal spatial variations holdup. is obtained from Quadrature Method Moments (QMOM)-based (PBM) which takes into account...