R. Handler
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View article: Efficient turbulent drag reduction using targeted polymer additives
Efficient turbulent drag reduction using targeted polymer additives Open
The effectiveness of polymer drag reduction by targeted injection is studied in comparison with that of a uniform concentration (or polymer ocean) in a turbulent channel flow. Direct numerical simulations are performed using a pseudo-spect…
View article: Model for the structure function constant for index of refraction fluctuations in Rayleigh-Benard turbulence
Model for the structure function constant for index of refraction fluctuations in Rayleigh-Benard turbulence Open
A model for the structure function constant associated with index of refraction fluctuations in Rayleigh-Benard turbulence is developed. The model is based upon the following assumptions: (1) the turbulence is homogeneous and isotropic at …
View article: Generation of Laminar Vortex Rings by an Impulsive Body Force
Generation of Laminar Vortex Rings by an Impulsive Body Force Open
It is shown that laminar vortex rings can be generated by impulsive body forces having particular spatial and temporal characteristics. The method produces vortex rings in a fluid initially at rest, and once generated, the flow field autom…
View article: A household-scale life cycle assessment model for understanding the food-energy-water nexus
A household-scale life cycle assessment model for understanding the food-energy-water nexus Open
The household is an important locus of decision-making regarding food, energy, and water (FEW) consumption. Changes in household FEW consumption behaviors can lead to significant reductions in environmental impacts, but it can be difficult…
View article: Numerical Simulation and Linearized Theory of Vortex Waves in a Viscoelastic, Polymeric Fluid
Numerical Simulation and Linearized Theory of Vortex Waves in a Viscoelastic, Polymeric Fluid Open
In a high viscosity, polymeric fluid initially at rest, the release of elastic energy produces vorticity in the form of coherent motions (vortex rings). Such behavior may enhance mixing in the low Reynolds number flows encountered in micro…
View article: The nature of bubble entrapment in a Lamb–Oseen vortex
The nature of bubble entrapment in a Lamb–Oseen vortex Open
Bubble trajectories in the presence of a decaying Lamb–Oseen vortex are calculated using a modified Maxey–Riley equation. Some bubbles are shown to get trapped within the vortex in quasi-equilibrium states. All the trapped bubbles exit the…
View article: Polyacrylamide in glycerol solutions from an atomistic perspective of the energetics, structure, and dynamics
Polyacrylamide in glycerol solutions from an atomistic perspective of the energetics, structure, and dynamics Open
All-atom molecular dynamics is used to investigate the structural, energetic, and dynamical properties of polyacrylamide (PAM) oligomers of different lengths solvated in pure glycerol, a 90:10 glycerol–water mixture, and pure water. We pre…
View article: Vortex generation in a finitely extensible nonlinear elastic Peterlin fluid initially at rest
Vortex generation in a finitely extensible nonlinear elastic Peterlin fluid initially at rest Open
It is well known that the mixing of two or more species in flows at low Reynolds numbers cannot be easily achieved since inertial effects are essentially absent and molecular diffusion is slow. To achieve mixing in Newtonian fluids under t…
View article: Front Cover Image, Volume 2, Number 3, March 2020
Front Cover Image, Volume 2, Number 3, March 2020 Open
The cover image is based on the Research Article Vortex generation in a finitely extensible nonlinear elastic Peterlin fluid initially at rest by Robert A. Handler et al., https://doi.org/10.1002/eng2.12135.
View article: Editorial: Applications of Infrared Methods in Fluid Mechanics
Editorial: Applications of Infrared Methods in Fluid Mechanics Open
EDITORIAL article Front. Mech. Eng., 20 December 2019Sec. Thermal and Mass Transport Volume 5 - 2019 | https://doi.org/10.3389/fmech.2019.00066
View article: Numerical Solution of the Radiation Transport Equation at an Air-Water Interface for a Stratified Medium
Numerical Solution of the Radiation Transport Equation at an Air-Water Interface for a Stratified Medium Open
This paper is a continuation of previous work that analytically examined the strength of radiation leaving an air-water interface. The approach here is to numerically integrate the radiation transport equation in order to capture the non-l…
View article: Analysis of Infrared Radiation at an Air-Water Interface
Analysis of Infrared Radiation at an Air-Water Interface Open
The problem of determining the strength of the infrared radiation from an air-water interface has been addressed analytically. The approach taken here is to express the Planck spectrum as a linear function of the temperature, an approximat…
View article: Estimating air-water gas transfer velocity during low wind condition with and without buoyancy
Estimating air-water gas transfer velocity during low wind condition with and without buoyancy Open
This work aims at refining the gas transfer velocity parameterization during low wind conditions with and withoutbuoyancy, to be used in regional and global climate models. This parameterization and the enhanced understanding of the smalls…
View article: Surface shear stress dependence of gas transfer velocity parameterizations using <scp>DNS</scp>
Surface shear stress dependence of gas transfer velocity parameterizations using <span>DNS</span> Open
Air‐water gas‐exchange is studied in direct numerical simulations (DNS) of free‐surface flows driven by natural convection and weak winds. The wind is modeled as a constant surface‐shear‐stress and the gas‐transfer is modeled via a passive…
View article: Near-surface physics during convection affecting air-water gas transfer
Near-surface physics during convection affecting air-water gas transfer Open
The gas flux at the water surface is affected by physical processes including turbulence from wind shear, microscale wave breaking, large-scale breaking, and convection due to heat loss at the surface. The main route in the parameterizatio…
View article: An evaluation of gas transfer velocity parameterizations during natural convection using <scp>DNS</scp>
An evaluation of gas transfer velocity parameterizations during natural convection using <span>DNS</span> Open
Direct numerical simulations (DNS) of free surface flows driven by natural convection are used to evaluate different methods of estimating air‐water gas exchange at no‐wind conditions. These methods estimate the transfer velocity as a func…