scholarly journals Diffusion and radiation in magnetized collisionless plasmas with small-scale Whistler turbulence

2016 ◽  
Vol 82 (2) ◽  
Author(s):  
Brett D. Keenan ◽  
Mikhail V. Medvedev
Keyword(s):  
Numerical Study ◽  
High Energy ◽  
High Energy Density ◽  
Larmor Radius ◽  
Small Scale ◽  
Collisionless Plasmas ◽  
Correlation Scale ◽  
Scale Turbulence ◽  
Solar Plasmas ◽  
High Energy Density Plasmas

Magnetized high-energy-density plasmas can often have strong electromagnetic fluctuations whose correlation scale is smaller than the electron Larmor radius. Radiation from the electrons in such plasmas – which markedly differs from both synchrotron and cyclotron radiation – is tightly related to their energy and pitch-angle diffusion. In this paper, we present a comprehensive theoretical and numerical study of particle transport in cold, ‘small-scale’ Whistler-mode turbulence and its relation to the spectra of radiation simultaneously produced by these particles. We emphasize that this relation is a superb diagnostic tool of laboratory, astrophysical, interplanetary and solar plasmas with a mean magnetic field and strong small-scale turbulence.

scholarly journals Demonstration of Geometric Effects and Resonant Scattering in the X-Ray Spectra of High-Energy-Density Plasmas

2021 ◽  
Vol 126 (8) ◽  
Author(s):  
G. Pérez-Callejo ◽  
E. V. Marley ◽  
D. A. Liedahl ◽  
L. C. Jarrott ◽  
G. E. Kemp ◽  
...  
Keyword(s):  
Energy Density ◽  
Resonant Scattering ◽  
High Energy ◽  
High Energy Density ◽  
X Ray ◽  
High Energy Density Plasmas ◽  
Geometric Effects

Experimental investigation of opacity models for stellar interior, inertial fusion, and high energy density plasmas

2009 ◽  
Vol 16 (5) ◽  
pp. 058101 ◽  
Author(s):  
J. E. Bailey ◽  
G. A. Rochau ◽  
R. C. Mancini ◽  
C. A. Iglesias ◽  
J. J. MacFarlane ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Energy Density ◽  
High Energy ◽  
High Energy Density ◽  
Inertial Fusion ◽  
Stellar Interior ◽  
High Energy Density Plasmas

scholarly journals Measurements of Ion Stopping Around the Bragg Peak in High-Energy-Density Plasmas

2015 ◽  
Vol 115 (20) ◽  
Author(s):  
J. A. Frenje ◽  
P. E. Grabowski ◽  
C. K. Li ◽  
F. H. Séguin ◽  
A. B. Zylstra ◽  
...  
Keyword(s):  
Energy Density ◽  
Bragg Peak ◽  
High Energy ◽  
High Energy Density ◽  
High Energy Density Plasmas

scholarly journals Momentum transport and nonlocality in heat-flux-driven magnetic reconnection in high-energy-density plasmas

2017 ◽  
Vol 96 (4) ◽  
Author(s):  
Chang Liu ◽  
William Fox ◽  
Amitava Bhattacharjee ◽  
Alexander G. R. Thomas ◽  
Archis S. Joglekar
Keyword(s):  
Heat Flux ◽  
Energy Density ◽  
Magnetic Reconnection ◽  
High Energy ◽  
Momentum Transport ◽  
High Energy Density ◽  
High Energy Density Plasmas

scholarly journals NUMERICAL STUDY OF THE GEOMETRIC INFLUENCE OF A FIN IN A CYLINDRICAL HEAT EXCHANGER FOR MELTING OF PCM

2019 ◽  
Vol 18 (1) ◽  
pp. 78
Author(s):  
F. C. Spengler ◽  
B. Oliveira ◽  
R. C. Oliveski ◽  
L. A. O. Rocha
Keyword(s):  
Heat Exchanger ◽  
Aspect Ratio ◽  
Phase Change ◽  
Latent Heat ◽  
Heat Storage ◽  
Numerical Study ◽  
Melting Process ◽  
High Energy ◽  
High Energy Density ◽  
Melting Time

The thermal heat storage it’s an effective way to suit the energy availability with the demand schedule. It can be stored in the means of sensible or latent heat, the latter applying a material denominated Phase Change Material (PCM), which is provided as organic compounds, hydrated salts, paraffins, among others. The latent heat storage systems offer several advantages, like the practically isothermal process of loading and unloading and the high energy density. However, the low thermal conductivity makes the cycle prolonged on these systems, restricting its applicability. Applying computational fluid dynamics, the behavior of the PCM melting process was studied in cylindrical cavities with horizontal and vertical fins, aiming the optimization of the fin geometry. In this way the fin area was kept constant, varying its aspect ratio. The numerical model was validated with results from the literature and it’s composed of the continuity, momentum and energy equations increased by the phase change model. Qualitative and quantitative results are presented, referring to mesh independence, contours of velocity, net fraction and temperature at different moments of the process. The results of the study indicate that the position of the fin in the heat exchanger influences the melting process, although the vertical fins have a faster total melting process, horizontal fins can reach larger partial liquid fractions in less time in the heat exchanger. Such as the position of the fin, the increase of its length propitiates the reduction of the melting time, evidencing the optimal aspect ratio.

Design of a Compliant Industrial Gripper Driven by a Bistable Shape Memory Alloy Actuator

2020 ◽  
Author(s):  
Dominik Scholtes ◽  
Stefan Seelecke ◽  
Gianluca Rizzello ◽  
Paul Motzki
Keyword(s):  
Shape Memory ◽  
High Energy ◽  
Industrial Applications ◽  
High Energy Density ◽  
Small Scale ◽  
Monitoring And Control ◽  
Actuation System ◽  
First Results ◽  
Functional Prototype ◽  
And Control

Abstract Within industrial manufacturing most processing steps are accompanied by transporting and positioning of workpieces. The active interfaces between handling system and workpiece are industrial grippers, which often are driven by pneumatics, especially in small scale areas. On the way to higher energy efficiency and digital factories, companies are looking for new actuation technologies with more sensor integration and better efficiencies. Commonly used actuators like solenoids and electric engines are in many cases too heavy and large for direct integration into the gripping system. Due to their high energy density shape memory alloys (SMA) are suited to overcome those drawbacks of conventional actuators. Additionally, they feature self-sensing abilities that lead to sensor-less monitoring and control of the actuation system. Another drawback of conventional grippers is their design, which is based on moving parts with linear guides and bearings. These parts are prone to wear, especially in abrasive environments. This can be overcome by a compliant gripper design that is based on flexure hinges and thus dispenses with joints, bearings and guides. In the presented work, the development process of a functional prototype for a compliant gripper driven by a bistable SMA actuation unit for industrial applications is outlined. The focus lies on the development of the SMA actuator, while the first design approach for the compliant gripper mechanism with solid state joints is proposed. The result is a working gripper-prototype which is mainly made of 3D-printed parts. First results of validation experiments are discussed.

Sign in / Sign up

Export Citation Format

Share Document