scholarly journals Nonlinear transport effects in mass separation by effusion

2011 ◽  
Vol 2011 (03) ◽  
pp. P03024 ◽  
Author(s):  
Pierre Gaspard ◽  
David Andrieux
Keyword(s):  
Mass Separation ◽  
Nonlinear Transport ◽  
Transport Effects

Symmetries in Hall-like systems: microwave and nonlinear transport effects

2008 ◽  
Vol 41 (30) ◽  
pp. 304036 ◽  
Author(s):  
Manuel Torres ◽  
Alejandro Kunold
Keyword(s):  
Nonlinear Transport ◽  
Transport Effects

scholarly journals Enhancing Thermoelectric Performance Using Nonlinear Transport Effects

2017 ◽  
Vol 7 (6) ◽  
Author(s):  
Jian-Hua Jiang ◽  
Yoseph Imry
Keyword(s):  
Thermoelectric Performance ◽  
Nonlinear Transport ◽  
Transport Effects

Investigating nonlinear transport effects in GaAs using electro-optic probing

2000 ◽  
Author(s):  
Khalid A. M. Ali ◽  
Anthony J. Vickers
Keyword(s):  
Nonlinear Transport ◽  
Electro Optic ◽  
Transport Effects

Atomistic methods in fluid simulation

2010 ◽  
Vol 368 (1916) ◽  
pp. 1547-1560 ◽  
Author(s):  
Kai Kadau ◽  
John L. Barber ◽  
Timothy C. Germann ◽  
Brad L. Holian ◽  
Berni J. Alder
Keyword(s):  
Direct Simulation Monte Carlo ◽  
Fluid Simulation ◽  
Dynamics Simulation ◽  
Navier Stokes ◽  
Future Research ◽  
Small Scale ◽  
Nonlinear Transport ◽  
Simulation Techniques ◽  
Current State ◽  
Transport Effects

Atomistic methods, such as molecular dynamics and direct simulation Monte Carlo, constitute a powerful and growing set of techniques for fluid-dynamics simulation. The more fundamental nature of such methods, which exhibit nonlinear transport effects and small-scale fluctuations, extends their modelling accuracy to a significantly wider range of scales and regimes than the more traditional Navier–Stokes-based continuum fluid-simulation techniques. In this paper, we describe the current state of the art in atomistic fluid simulation, from both a theoretical and a computational standpoint, and outline the advantages and limitations of such methods. In addition, we present an overview of some recent atomistic-simulation results on fluid instabilities and on the physical scaling of atomistic techniques. Finally, we suggest possible avenues of future research in the field.

Memory and nonlinear transport effects in charging–discharging of a supercapacitor

2016 ◽  
Vol 61 (2) ◽  
pp. 250-259 ◽  
Author(s):  
V. V. Uchaikin ◽  
A. S. Ambrozevich ◽  
R. T. Sibatov ◽  
S. A. Ambrozevich ◽  
E. V. Morozova
Keyword(s):  
Nonlinear Transport ◽  
Transport Effects

Carrier Transport Effects in SCH Laser Diodes

1998 ◽  
Vol 52 (2) ◽  
pp. 93-96
Author(s):  
I. A. Sukhoivanov ◽  
W. Freude
Keyword(s):  
Carrier Transport ◽  
Laser Diodes ◽  
Transport Effects

scholarly journals A critical look at the prediction of the temperature field around a laser-induced melt pool on metallic substrates

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yi Shu ◽  
Daniel Galles ◽  
Ottman A. Tertuliano ◽  
Brandon A. McWilliams ◽  
Nancy Yang ◽  
...  
Keyword(s):  
Laser Beam ◽  
Constant Velocity ◽  
Three Dimensional ◽  
Laser Beams ◽  
Poor Control ◽  
Metallic Substrates ◽  
Melt Pool ◽  
Mechanical Models ◽  
Transport Effects ◽  
Thermal Histories

AbstractThe study of microstructure evolution in additive manufacturing of metals would be aided by knowing the thermal history. Since temperature measurements beneath the surface are difficult, estimates are obtained from computational thermo-mechanical models calibrated against traces left in the sample revealed after etching, such as the trace of the melt pool boundary. Here we examine the question of how reliable thermal histories computed from a model that reproduces the melt pool trace are. To this end, we perform experiments in which one of two different laser beams moves with constant velocity and power over a substrate of 17-4PH SS or Ti-6Al-4V, with low enough power to avoid generating a keyhole. We find that thermal histories appear to be reliably computed provided that (a) the power density distribution of the laser beam over the substrate is well characterized, and (b) convective heat transport effects are accounted for. Poor control of the laser beam leads to potentially multiple three-dimensional melt pool shapes compatible with the melt pool trace, and therefore to multiple potential thermal histories. Ignoring convective effects leads to results that are inconsistent with experiments, even for the mild melt pools here.

scholarly journals The Knudsen Paradox in Micro-Channel Poiseuille Flows with a Symmetric Particle

2020 ◽  
Vol 11 (1) ◽  
pp. 351
Author(s):  
Ananda Subramani Kannan ◽  
Tejas Sharma Bangalore Narahari ◽  
Yashas Bharadhwaj ◽  
Andreas Mark ◽  
Gaetano Sardina ◽  
...  
Keyword(s):  
Flow Behavior ◽  
Direct Simulation Monte Carlo ◽  
Micro Channel ◽  
Confined Geometries ◽  
Rarefied Flows ◽  
Model Pore ◽  
Duct Geometry ◽  
Transport Effects ◽  
Non Local ◽  
Simulation Monte Carlo

The Knudsen paradox—the non-monotonous variation of mass-flow rate with the Knudsen number—is a unique and well-established signature of micro-channel rarefied flows. A particle which is not of insignificant size in relation to the duct geometry can significantly alter the flow behavior when introduced in such a system. In this work, we investigate the effects of a stationary particle on a micro-channel Poiseuille flow, from continuum to free-molecular conditions, using the direct simulation Monte-Carlo (DSMC) method. We establish a hydrodynamic basis for such an investigation by evaluating the flow around the particle and study the blockage effect on the Knudsen paradox. Our results show that with the presence of a particle this paradoxical behavior is altered. The effect is more significant as the particle becomes large and results from a shift towards relatively more ballistic molecular motion at shorter geometrical distances. The need to account for combinations of local and non-local transport effects in modeling reactive gas–solid flows in confined geometries at the nano-scale and in nanofabrication of model pore systems is discussed in relation to these results.

Nonlinear transport of rarefied Couette flows from low speed to high speed

2020 ◽  
Vol 32 (11) ◽  
pp. 112021
Author(s):  
Jihui Ou ◽  
Jie Chen
Keyword(s):  
High Speed ◽  
Nonlinear Transport ◽  
Low Speed
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