scholarly journals STUDIES ON CONVECTIVE COOLING OF CRYOGENIC FLUIDS TOWARDS SUPERCONDUCTING APPLICATIONS

2017 ◽  
Author(s):  
KAMALAKANTA SATPATHY ◽  
CHARLES DUBOIS ◽  
ALEXIS DUCHESNE ◽  
JEAN-FRANÇOIS FAGNARD ◽  
HERVÉ CAPS ◽  
...  
Keyword(s):  
Convective Cooling ◽  
Cryogenic Fluids ◽  
Superconducting Applications

Electrotechnical prospects for superconducting applications

1988 ◽  
Vol 13 (5) ◽  
pp. 365-379
Author(s):  
Y. Brunet ◽  
M. Renard
Keyword(s):  
Superconducting Applications

Fundamental Issues and Recent Advancements in Analysis of Aircraft Brake Natural Convective Cooling

1998 ◽  
Vol 120 (4) ◽  
pp. 840-857 ◽  
Author(s):  
M. P. Dyko ◽  
K. Vafai
Keyword(s):  
Heat Transfer ◽  
Natural Convection ◽  
Flow Field ◽  
Three Dimensional ◽  
Convective Cooling ◽  
Cooling Flow ◽  
Physical Mechanisms ◽  
Braking System ◽  
Flow And Heat Transfer ◽  
Convection Cooling

A heightened awareness of the importance of natural convective cooling as a driving factor in design and thermal management of aircraft braking systems has emerged in recent years. As a result, increased attention is being devoted to understanding the buoyancy-driven flow and heat transfer occurring within the complex air passageways formed by the wheel and brake components, including the interaction of the internal and external flow fields. Through application of contemporary computational methods in conjunction with thorough experimentation, robust numerical simulations of these three-dimensional processes have been developed and validated. This has provided insight into the fundamental physical mechanisms underlying the flow and yielded the tools necessary for efficient optimization of the cooling process to improve overall thermal performance. In the present work, a brief overview of aircraft brake thermal considerations and formulation of the convection cooling problem are provided. This is followed by a review of studies of natural convection within closed and open-ended annuli and the closely related investigation of inboard and outboard subdomains of the braking system. Relevant studies of natural convection in open rectangular cavities are also discussed. Both experimental and numerical results obtained to date are addressed, with emphasis given to the characteristics of the flow field and the effects of changes in geometric parameters on flow and heat transfer. Findings of a concurrent numerical and experimental investigation of natural convection within the wheel and brake assembly are presented. These results provide, for the first time, a description of the three-dimensional aircraft braking system cooling flow field.

Overall Effectiveness for a Film Cooled Turbine Blade Leading Edge With Varying Hole Pitch

2010 ◽  
Author(s):  
Thomas E. Dyson ◽  
Dave G. Bogard ◽  
Justin D. Piggush ◽  
Atul Kohli
Keyword(s):  
Turbine Blade ◽  
Hot Spots ◽  
Leading Edge ◽  
Stagnation Line ◽  
Convective Cooling ◽  
Impingement Cooling ◽  
Blowing Ratio ◽  
Cylindrical Holes ◽  
Overall Effectiveness ◽  
Blade Leading Edge

Overall effectiveness, φ, for a simulated turbine blade leading edge was experimentally measured using a model constructed with a relatively high conductivity material selected so that the Biot number of the model matched engine conditions. The model incorporated three rows of cylindrical holes with the center row positioned on the stagnation line. Internally the model used an impingement cooling configuration. Overall effectiveness was measured for pitch variation from 7.6d to 9.6d for blowing ratios ranging from 0.5 to 3.0, and angle of attack from −7.7° to +7.7°. Performance was evaluated for operation with a constant overall mass flow rate of coolant. Consequently when increasing the pitch, the blowing ratio was increased proportionally. The increased blowing ratio resulted in increased impingement cooling internally and increased convective cooling through the holes. The increased internal and convective cooling compensated, to a degree, for the decreased coolant coverage with increased pitch. Performance was evaluated in terms of laterally averaged φ, but also in terms of the minimum φ. The minimum φ evaluation revealed localized hot spots which are arguably more critical to turbine blade durability than the laterally averaged results. For small increases in pitch there was negligible decrease in performance.

Temperature-programmed nitridation of monodispersed VOx nanoparticles into nanocrystalline superconducting oxygen-doped vanadium nitride

2021 ◽  
Author(s):  
Khemchand Dewangan ◽  
Dadan Singh ◽  
Sandeep Kumar Singh Patel ◽  
Kamlesh Kumar Shrivas
Keyword(s):  
Thermal Decomposition ◽  
Synthesis Process ◽  
Vanadium Nitride ◽  
High Quality ◽  
Two Stage ◽  
Stage Synthesis ◽  
Temperature Programmed ◽  
Superconducting Applications

A two-stage synthesis process was employed to prepare high-quality nanocrystalline vanadium nitride (VN) for superconducting applications. Firstly, monodispersed amorphous VOx nanoparticles were obtained via thermal-decomposition of vanadium (III) acetylacetonate [V(acac)3]...

Free D atoms in pulse radiolysis of methane in cryogenic fluids

1995 ◽  
Vol 99 (28) ◽  
pp. 11122-11130 ◽  
Author(s):  
I. A. Shkrob ◽  
A. D. Trifunac
Keyword(s):  
Pulse Radiolysis ◽  
Cryogenic Fluids
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