Numerical simulations of liquid metal experiments on cosmic magnetic fields

2009 ◽  
Vol 23 (6) ◽  
pp. 405-429 ◽  
Author(s):  
Frank Stefani ◽  
André Giesecke ◽  
Gunter Gerbeth
Keyword(s):  
Magnetic Fields ◽  
Liquid Metal ◽  
Numerical Simulations

scholarly journals Models of radio galaxies with tangled magnetic fields – II. Numerical simulations and their interpretation

1990 ◽  
Vol 242 (4) ◽  
pp. 623-635 ◽  
Author(s):  
A. P. Matthews ◽  
P. A. G. Scheuer
Keyword(s):  
Magnetic Fields ◽  
Numerical Simulations ◽  
Radio Galaxies

Direct numerical simulations for liquid metal applications

2019 ◽  
pp. 219-244 ◽  
Author(s):  
I. Tiselj ◽  
E. Stalio ◽  
D. Angeli ◽  
J. Oder
Keyword(s):  
Liquid Metal ◽  
Numerical Simulations ◽  
Direct Numerical Simulations

Recollimation shocks in relativistic jets

2018 ◽  
Vol 27 (10) ◽  
pp. 1844011 ◽  
Author(s):  
José M. Martí ◽  
Manel Perucho ◽  
José L. Gómez ◽  
Antonio Fuentes
Keyword(s):  
Magnetic Fields ◽  
Numerical Simulations ◽  
Theoretical Background ◽  
Synchrotron Emission ◽  
Relativistic Jets ◽  
Dominant Type ◽  
X Ray ◽  
Extragalactic Jets ◽  
X Ray Binaries ◽  
Selection Of

Recollimation shocks (RS) appear associated with relativistic flows propagating through pressure mismatched atmospheres. Astrophysical scenarios invoking the presence of such shocks include jets from AGNs and X-ray binaries and GRBs. We shall start reviewing the theoretical background behind the structure of RS in overpressured jets. Next, basing on numerical simulations, we will focus on the properties of RS in relativistic steady jets threaded by helical magnetic fields depending on the dominant type of energy. Synthetic radio maps from the simulation of the synchrotron emission for a selection of models in the context of parsec-scale extragalactic jets will also be discussed.

Eddy Current Flow Meter Performance in Liquid Metal Flows Inclined to the Sensor Axis

2021 ◽  
Author(s):  
Nico Krauter ◽  
Vladimir Galindo ◽  
Thomas Wondrak ◽  
Sven Eckert ◽  
Gunter Gerbeth
Keyword(s):  
Liquid Metal ◽  
Numerical Simulations ◽  
Eddy Current ◽  
Current Flow ◽  
Fast Reactors ◽  
Flow Meter ◽  
Flow Angle ◽  
Model Experiments ◽  
Inductive Sensor ◽  
Pipe Flows

Abstract The Eddy Current Flow Meter is a reliable and robust inductive sensor for the measurement of flowrates in liquid metal flows. This kind of sensor is usually being used in pipe flows where the flow is mostly parallel to the sensor axis. When this sensor is used as part of the safety instrumentation above the subassemblies in liquid metal cooled fast reactors, the flow angle may change rapidly according to the conditions within the reactor. In this paper we investigate the performance of the Eddy Current Flow Meter in flows inclined to the sensor axis by numerical simulations as well as model experiments. We demonstrate that the Eddy Current Flow Meter yields reliable results for flow angles up to 30° while the sensitivity of the sensor is significantly reduced for larger angles.

scholarly journals A Liquid-Metal-Based Dielectrophoretic Microdroplet Generator

Micromachines ◽  
2019 ◽  
Vol 10 (11) ◽  
pp. 769 ◽  
Author(s):  
Wang ◽  
Zhang ◽  
Gao ◽  
Wang ◽  
Deng ◽  
...  
Keyword(s):  
Liquid Metal ◽  
Electric Field ◽  
Numerical Simulations ◽  
Parametric Study ◽  
Microfluidic Channel ◽  
Droplet Generator ◽  
Metal Electrodes ◽  
Droplet Generators

This paper proposes a novel microdroplet generator based on the dielectrophoretic (DEP) force. Unlike the conventional continuous microfluidic droplet generator, this droplet generator is more like “invisible electric scissors”. It can cut the droplet off from the fluid matrix and modify droplets’ length precisely by controlling the electrodes’ length and position. These electrodes are made of liquid metal by injection. By applying a certain voltage on the liquid-metal electrodes, the electrodes generate an uneven electric field inside the main microfluidic channel. Then, the uneven electric field generates DEP force inside the fluid. The DEP force shears off part from the main matrix, in order to generate droplets. To reveal the mechanism, numerical simulations were performed to analyze the DEP force. A detailed experimental parametric study was also performed. Unlike the traditional droplet generators, the main separating force of this work is DEP force only, which can produce one droplet at a time in a more precise way.

Study of Liquid-Metal Based Heating Method for Temperature Gradient Focusing Purpose

2013 ◽  
Vol 135 (9) ◽  
Author(s):  
M. Gao ◽  
L. Gui ◽  
J. Liu
Keyword(s):  
Optimal Design ◽  
Temperature Gradient ◽  
Liquid Metal ◽  
Theoretical Analysis ◽  
Numerical Simulations ◽  
Microfluidic Channels ◽  
Heating Method ◽  
Electrical Heater ◽  
Temperature Gradient Focusing ◽  
A New Technique

Temperature gradient focusing (TGF) is a highly efficient focusing technique for the concentration and separation of charged analytes in microfluidic channels. The design of an appropriate temperature gradient is very important for the focusing efficiency. In this study, we proposed a new technique to generate the temperature gradient. This technique utilizes a microchannel filled with liquid-metal as an electrical heater in a microfluidic chip. By applying an electric current, the liquid-metal heater generates Joule heat, forming the temperature gradient in the microchannel. To optimize the temperature gradient and find out the optimal design for the TGF chip, numerical simulations on four typical designs were studied. The results showed that design 1 can provide a best focusing method, which has the largest temperature gradient. For this best design, the temperature is almost linearly distributed along the focusing microchannel. The numerical simulations were then validated both theoretically and experimentally. The following experiment and theoretical analysis on the best design also provide a useful guidance for designing and fabricating the liquid-metal based TGF microchip.

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