A comprehensive study of the induced current, the electromagnetic force field, and the velocity field in a complex electromagnetically driven flow system

1987 ◽  
Vol 18 (3) ◽  
pp. 529-538 ◽  
Author(s):  
J. L. Meyer ◽  
N. El-Kaddah ◽  
J. Szekely ◽  
C. Vivès ◽  
R. Ricou
Keyword(s):  
Velocity Field ◽  
Force Field ◽  
Electromagnetic Force ◽  
Flow System ◽  
Induced Current ◽  
Comprehensive Study

Effects of Organic Additives on Calcium Sulfate Scaling in Pipes

2009 ◽  
Vol 62 (8) ◽  
pp. 927 ◽  
Author(s):  
Tung A. Hoang ◽  
H. Ming Ang ◽  
Andrew L. Rohl
Keyword(s):  
Pipe Flow ◽  
Calcium Sulfate ◽  
Chemical Structure ◽  
Flow System ◽  
Organic Additives ◽  
Pipe System ◽  
Calcium Sulfate Scale ◽  
First Time ◽  
Over Time ◽  
Comprehensive Study

A comprehensive study of the effects of nine organic additives on the formation of calcium sulfate scale in a pipe system was conducted using a multiple pipe flow system. Several factors that influence the inhibitory capability of phosphonic and carboxylic additives such as their chemical structure, their concentration, and the run time were closely scrutinized. Results showed that the organic additives influence the deposition of calcium sulfate on the walls of a pipe flow system at various levels. The superiority of the phosphonic additives, especially N,N,N′,N′-ethylenediaminetetramethylenephosphonic acid (EDTP) and nitrilotrimethylenephosphonic acid (NTMP), to other organic compounds with respect to scale prevention is discussed thoroughly. For the first time, it was demonstrated that a solution with a given concentration of inhibitor that is continuously refreshed in a pipe reactor becomes less effective over time. The morphology of the scales formed in the presence of different additives is also studied, using scanning electron microscopy.

The Calculation of Transport Phenomena in Electromagnetically Levitated Metal Droplets

1981 ◽  
Vol 9 ◽  
Author(s):  
N. El-Kaddah ◽  
J. Szekely
Keyword(s):  
Temperature Field ◽  
Fluid Flow ◽  
Flow Field ◽  
Force Field ◽  
Electromagnetic Force ◽  
Stokes Equations ◽  
Concentration Field ◽  
Metal Droplet ◽  
Convective Transport ◽  
Mathematical Representation

ABSTRACTA mathematical representation has been developed for the electromagnetic force field, the fluid flow field, the temperature field (and for transport controlled kinetics) in a levitation melted metal droplet. The technique of mutual inductances was employed for the calculation of the electromagnetic force field, while the turbulent Navier-Stokes equations and the turbulent convective transport equations were used to represent the fluid flow field, the temperature field and the concentration field. The governing differential equations, written in spherical coordinates, were solved numerically.The computed results were found to be in good agreement with measurements reported in the literature, regarding the lifting force and the average temperature of the specimen.

Shaping inductor geometry for casting functionally graded composites

2016 ◽  
Vol 35 (1) ◽  
pp. 16-26 ◽  
Author(s):  
Slawomir Golak ◽  
Mirosław Kordos
Keyword(s):  
Force Field ◽  
Electromagnetic Force ◽  
Low Frequency ◽  
Casting Process ◽  
Optimization Methods ◽  
Optimization Method ◽  
Functionally Graded ◽  
Matrix Composites ◽  
Content Type ◽  
Functionally Graded Composites

Purpose – The attractiveness of functionally graded composites lies in the possibility of a gradual spatial change of their properties such as hardness, strength and wear resistance. The purpose of this paper is to discuss the use of electromagnetic buoyancy to separate the reinforcement particles during the casting process of such a composite. Design/methodology/approach – The basic problem encountered in the process of casting composites is to obtain electromagnetic buoyancy and simultaneously to avoid a flow of the liquid metal which destroys the desired composite structure. In this paper the authors present the methodology of numerical optimization of inductor geometry in order to homogenize the electromagnetic force field distribution. Findings – The optimization method based on searching the solution subspace created by applying knowledge of the modelled process physics proved better than the universal local optimization methods. These results were probably caused by the complex shape of the criterion function hypersurface characterized by the presence of local minima. Practical implications – Due to their characteristics, functionally graded composites are of great interest to the automotive, aerospace and defense industries. In the case of metal matrix composites casting techniques (as the presented one) are the most effective methods of producing functionally graded materials. Originality/value – The paper presents the optimization of a new process of casting functionally graded composites in a low-frequency alternating electromagnetic field. The process involves problems that did not occur previously in the area of electromagnetic processing of materials. The paper proposes the use of special design of inductors to homogenize the electromagnetic force field.

Analysis of DC bias vibration of transformer core based on electromagnetic force field coupling

2016 ◽  
Vol 50 (2) ◽  
pp. 297-309 ◽  
Author(s):  
Yongming Yang ◽  
Xingmou Liu ◽  
Fan Yang ◽  
Ammad Jadoon ◽  
Chenyang Zhang
Keyword(s):  
Force Field ◽  
Electromagnetic Force ◽  
Field Coupling ◽  
Dc Bias ◽  
Transformer Core
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