scholarly journals Magnetohydrodynamic Control of Hypersonic Separation Flows

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Shichao Luo ◽  
Jun Liu ◽  
Hao Jiang ◽  
Junyuan Wang
Keyword(s):  
Electromagnetic Field ◽  
Flow Control ◽  
External Electromagnetic Field ◽  
Separation Flow ◽  
Negative Effects ◽  
Low Velocity ◽  
Laminar Separation ◽  
Flow Acceleration ◽  
Hypersonic Inlet ◽  
Separation Flows

Magnetohydrodynamic (MHD) control of hypersonic laminar separation flows is investigated in this paper. A series of numerical simulations over various geometry configurations, namely, a compression corner and a double wedge ramp hypersonic inlet, have been conducted by application of an external electromagnetic field. Results show that the performance of MHD separation flow control is mainly determined by flow acceleration of the Lorentz force directed in the streamwise direction. The Joule heating term always brings negative effects on the MHD separation flow control and increased the static pressure locally, where the electromagnetic field is applied. With an external electromagnetic field applied, the low velocity fluid in the boundary layer can be accelerated. Moreover, there exists a best location for the MHD zone to be applied and completely eliminate the separation of the flow from the surface.

Exact solution for the linear response of atomic hydrogen to an external electromagnetic field

1974 ◽  
Vol 47 (6) ◽  
pp. 447-448 ◽  
Author(s):  
M. Luban ◽  
B. Nudler ◽  
I. Freund
Keyword(s):  
Exact Solution ◽  
Electromagnetic Field ◽  
Atomic Hydrogen ◽  
Linear Response ◽  
External Electromagnetic Field

Separation flow control on a generic ground vehicle using steady microjet arrays

2010 ◽  
Author(s):  
Sandrine Aubrun ◽  
Farrukh Alvi ◽  
Azeddine Kourta
Keyword(s):  
Flow Control ◽  
Separation Flow ◽  
Ground Vehicle

scholarly journals PSEUDOCLASSICAL MODEL OF SPINNING PARTICLE WITH ANOMALOUS MAGNETIC MOMENTUM

1993 ◽  
Vol 08 (05) ◽  
pp. 463-468 ◽  
Author(s):  
D.M. GITMAN ◽  
A.V. SAA
Keyword(s):  
Electromagnetic Field ◽  
External Electromagnetic Field ◽  
Invariant Form ◽  
Pauli Equation ◽  
Spinning Particle ◽  
Dirac Quantization

A generalization of the pseudoclassical action of a spinning particle in the presence of an anomalous magnetic momentum is given. The action is written in reparametrization and supergauge invariant form. The Dirac quantization, based on the Hamiltonian analyzes of the model, leads to the Dirac-Pauli equation for a particle with an anomalous magnetic momentum in an external electromagnetic field. Due to the structure of first class constraints in that case, the Dirac quantization demands for consistency to take into account an operator’s ordering problem.

An FDTD Method for the Transient Terminal Response of Twisted-Wire Pairs Illuminated by an External Electromagnetic Field

2018 ◽  
Vol 60 (2) ◽  
pp. 435-443 ◽  
Author(s):  
Youjie Yan ◽  
Lin Meng ◽  
Xiaolong Liu ◽  
Tingyong Jiang ◽  
Jin Chen ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
Fdtd Method ◽  
External Electromagnetic Field ◽  
Terminal Response ◽  
Twisted Wire

Electrospun Sodium-Cobalt Oxide Ceramic Nanofiber and the Electromagnetic Responses

2017 ◽  
Author(s):  
Arturo G. Bautista ◽  
Juan A. Aguado ◽  
Yong X. Gan
Keyword(s):  
Electromagnetic Field ◽  
Cobalt Oxide ◽  
External Electromagnetic Field ◽  
Dielectric Behavior ◽  
Ceramic Fiber ◽  
Oxide Ceramic ◽  
Hyperthermia Treatment ◽  
Electromagnetic Responses ◽  
Sodium Cobalt Oxide ◽  
Heating Behavior

In this work, a sodium-cobalt oxide (NaxCo2O4) ceramic composite nanofiber was manufactured through electrospinning. The response of the fiber to external electromagnetic field was characterized to observe the heat generation in the fiber. In addition, we also measured the current passing through the fiber under the polarization of DC potential. It is found that the fiber has intensive heating behavior when it is exposed to the electromagnetic field. The temperature increases more than 5 degrees in Celsius scale only after 5 s exposure. The current – potential curve of the fiber reveals its dielectric behavior. It is concluded that this ceramic fiber has the potential to be used for hyperthermia treatment in biomedical engineering or for energy conversions.

Effect of external electromagnetic field and bias voltage on the vapor growth, morphology and properties of carbon micro coils

Carbon ◽  
2000 ◽  
Vol 38 (4) ◽  
pp. 565-571 ◽  
Author(s):  
W In-Hwang ◽  
Xiuqin Chen ◽  
T Kuzuya ◽  
K Kawabe ◽  
S Motojima
Keyword(s):  
Electromagnetic Field ◽  
Bias Voltage ◽  
External Electromagnetic Field ◽  
Growth Morphology ◽  
Vapor Growth

scholarly journals Performance and wake characteristics of tidal turbines in an infinitely large array

2021 ◽  
Vol 925 ◽  
Author(s):  
Pablo Ouro ◽  
Takafumi Nishino
Keyword(s):  
Bulk Velocity ◽  
Large Array ◽  
Negative Effects ◽  
Local Flow ◽  
Flow Acceleration ◽  
Positive Effects ◽  
Tidal Turbines ◽  
Macro Scale ◽  
Wake Interactions ◽  
Blockage Effect

The efficiency of tidal stream turbines in a large array depends on the balance between negative effects of turbine-wake interactions and positive effects of bypass-flow acceleration due to local blockage, both of which are functions of the layout of turbines. In this study we investigate the hydrodynamics of turbines in an infinitely large array with aligned or staggered layouts for a range of streamwise and lateral turbine spacing. First, we present a theoretical analysis based on an extension of the linear momentum actuator disc theory for perfectly aligned and staggered layouts, employing a hybrid inviscid-viscous approach to account for the local blockage effect within each row of turbines and the viscous (turbulent) wake mixing behind each row in a coupled manner. We then perform large-eddy simulation (LES) of open-channel flow for 28 layouts of tidal turbines using an actuator line method with doubly periodic boundary conditions. Both theoretical and LES results show that the efficiency of turbines (or the power of turbines for a given bulk velocity) in an aligned array decreases as we reduce the streamwise turbine spacing, whereas that in a staggered array remains high and may even increase due to the positive local blockage effect (causing the local flow velocity upstream of each turbine to exceed the bulk velocity) if the lateral turbine spacing is sufficiently small. The LES results further reveal that the amplitude of wake meandering tends to decrease as we reduce the lateral turbine spacing, which leads to a lower wake recovery rate in the near-wake region. These results will help to understand and improve the efficiency of tidal turbines in future large arrays, even though the performance of real tidal arrays may depend not only on turbine-to-turbine interactions within the array but also on macro-scale interactions between the array and natural tidal currents, the latter of which are outside the scope of this study.

ELECTROMAGNETIC DETECTION OF AXIONS IN A WAVE GUIDE

1998 ◽  
Vol 13 (11) ◽  
pp. 873-878 ◽  
Author(s):  
DANG VAN SOA
Keyword(s):  
Electromagnetic Field ◽  
Cross Sections ◽  
Differential Cross ◽  
External Electromagnetic Field ◽  
Wave Guide ◽  
Differential Cross Sections ◽  
Electromagnetic Detection

The conversion of photons into axions in a periodic external electromagnetic field, i.e. the TEm0 mode, is considered in details by using Feynman methods. The differential cross-sections are given. It is shown that the lowest mode gives the main contribution to the considered process.

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