scholarly journals A Parametric Study on the Effects of Process Conditions on Dehydrogenation, Wall Shear and Slag Entrainment in the Vacuum Arc Degasser Using Mathematical Modelling

2018 ◽  
Vol 58 (9) ◽  
pp. 1679-1686
Author(s):  
Faris Karouni ◽  
Bradley P Wynne ◽  
Jesus Talamantes-Silva ◽  
Stephen Phillips
Keyword(s):  
Mathematical Modelling ◽  
Parametric Study ◽  
Vacuum Arc ◽  
Process Conditions ◽  
Slag Entrainment ◽  
Wall Shear

scholarly journals Bed particle saltation in turbulent wall-shear flow: a review

2019 ◽  
Vol 475 (2223) ◽  
pp. 20180824 ◽  
Author(s):  
Sk Zeeshan Ali ◽  
Subhasish Dey
Keyword(s):  
Shear Flow ◽  
Mathematical Modelling ◽  
Critical Appraisal ◽  
Particle Collision ◽  
Particle Rotation ◽  
Current State ◽  
Wall Shear ◽  
Turbulent Wall ◽  
Particle Saltation

Bed particle saltation in turbulent wall-shear flow remains an intriguing phenomenon in applied hydro-dynamics. In this review, we report the current state of the art of bed particle saltation in turbulent wall-shear flow, highlighting the physical characteristics of bed particle saltation and its mathematical modelling. A critical appraisal of the mechanics of bed particle saltation is presented thorough ample experimental evidence. The salient features of bed particle saltation, encompassing the saltation height, saltation length, particle velocity, saltation duration, particle collision with the bed, particle rotation, particle resting time and particle re-entrainment, are thoroughly discussed. Both the deterministic and computational fluid dynamics approaches in modelling bed particle saltation are summarized, and the subtle role of the hydrodynamic forces is elaborated. The estimation of bedload flux in a fluvial environment, emanating from the mathematical modelling of bed particle saltation, is delineated using different modelling approaches. Finally, the challenges in modelling bed particle saltation are highlighted, and a new look at bed particle saltation is furnished.

Mathematical modelling and parametric study on a 30 kWel high temperature PEM fuel cell based residential micro cogeneration plant

2015 ◽  
Vol 40 (3) ◽  
pp. 1569-1583 ◽  
Author(s):  
Behzad Najafi ◽  
Alireza Haghighat Mamaghani ◽  
Andrea Baricci ◽  
Fabio Rinaldi ◽  
Andrea Casalegno
Keyword(s):  
High Temperature ◽  
Fuel Cell ◽  
Mathematical Modelling ◽  
Parametric Study ◽  
Pem Fuel Cell ◽  
Cogeneration Plant ◽  
High Temperature Pem

Mathematical modelling of the plasma arc behaviour in the vacuum arc remelting process

2003 ◽  
Vol 100 (7-8) ◽  
pp. 683-695
Author(s):  
P. Chapelle ◽  
J.-P. Bellot ◽  
H. Duval ◽  
A. Jardy ◽  
D. Ablitzer
Keyword(s):  
Mathematical Modelling ◽  
Vacuum Arc ◽  
Plasma Arc ◽  
Vacuum Arc Remelting

Microstructure and Interface Behavior in Diffusion Bonded Ni3Al+B Matrices Containing Continuous Al2O3 Fibers.

1990 ◽  
Vol 194 ◽  
Author(s):  
C. Lee ◽  
D. S. Grummon ◽  
G. Gottstein
Keyword(s):  
Diffusion Bonding ◽  
Nickel Aluminide ◽  
Vacuum Arc ◽  
Process Conditions ◽  
Matrix Composites ◽  
Boron Doped ◽  
Metallurgical Bonding ◽  
The Matrix ◽  
Reaction Zones ◽  
Fiber Reinforcements

AbstractDiffusion bonding is a well known method for fabricating metal matrix composites with continuous fiber reinforcements. However. little data yet exist regarding optimum processing conditions for production of such composites using intermetallic matrices. In this study, diffusion bonded couples were made from boron doped nickel aluminide slabs (vacuum arc remelted alloy IC-15 ) into which small numbers of continuous fibers of α-A12O3 were laid up. Diffusion bonding was carried out in vacuum at stresses between 20 and 50 MPa for 2 to 8 hours at 1273K to 1553K. The specimens were then fractured in uniaxial tension at room temperature and the microstructures and fracture surfaces examined. Preliminary data from optical and scanning electron microscopy showed complete metallurgical bonding of the IC-15 slabs occurred only when process temperatures exceeded 1533K. At these temperatures a 2-hour processing time resulted in considerable grain growth in both the matrix and in the fibers. Occasional fiber fracture was also found to have occurred during the bonding cycle. Auger electron spectroscopy revealed little interdiffusion between fiber and matrix after 2 hours at 1553K and no apparent fiber-matrix reaction zones were detected for any of the process conditions studied.

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