Influence of size and shape effects on the high-pressure solubility of n-alkanes: Experimental data, correlation and prediction

Concentration gradients resulting from long range diffusion during Severe Plastic Deformation (SPD) have been investigated with the 3D Atom Probe technique (3D-AP). First, in a pearlitic steel where alloying elements (Mn, Si and Cr) are partitioned between the ferrite and carbides in the non-deformed state. After processing by High Pressure Torsion (HPT), they are homogeneously distributed in the nanostructure, indicating that long range diffusion occurred along with the dissolution of carbides. 3D-AP data of a Cu-Fe composite processed by HPT show as well a significant interdiffusion of Cu and Fe, probably promoted by additional vacancies. On the basis of these experimental data, and using the theory described for irradiated materials, vacancy fluxes and vacancy production rates were estimated assuming that new vacancies are continuously produced and eliminated on grain boundaries.

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Integration of Al-Fill Processes for Contacts and VIAS

MRS Proceedings ◽

10.1557/proc-427-253 ◽

1996 ◽

Vol 427 ◽

Cited By ~ 9

Author(s):

H. J. Barth

Keyword(s):

High Pressure ◽

Chip Design ◽

Size And Shape ◽

Future Developments ◽

Pattern Density ◽

New Challenges ◽

On Chip ◽

Damascene Interconnects ◽

Low K ◽

Electrical Data

AbstractToday different Al-fill techniques are used for the fill of submicron contacts and vias. The integration aspects of the most promising approaches, Al-reflow, cold/hot Al-planarization and high pressure Al-fill (Forcefill) are compared to the widely used W-plug technique. The filling properties are discussed with respect to future applications in ULSI devices. Special attention is given to the barrier stability in contacts and the influence on patterning. Various electrical data and reliability results are compared to metallizations with W-plugs. The implications of the Al-fill processes on chip design, especially on the size and shape of holes, the pattern density, the possibility of producing stacked contacts/vias and the metal to contact/via overlap are considered also. In an outlook for future developments, e.g. the introduction of low k dielectrics, the inverse metallization architecture with (dual) damascene interconnects and the emerging Cu metallizations, Alfill processes are facing new challenges which will be discussed.

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Vortex configurations in mesoscopic superconducting triangles: Finite-size and shape effects

EPL (Europhysics Letters) ◽

10.1209/0295-5075/83/17008 ◽

2008 ◽

Vol 83 (1) ◽

pp. 17008 ◽

Cited By ~ 26

Author(s):

H. J. Zhao ◽

V. R. Misko ◽

F. M. Peeters ◽

S. Dubonos ◽

V. Oboznov ◽

...

Keyword(s):

Finite Size ◽

Size And Shape ◽

Shape Effects

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Volumetric and transport properties of ternary mixtures containing 1-propanol, triethylamine or tri-n-butylamine and cyclohexane at 303.15K: Experimental data, correlation and prediction by ERAS model

Thermochimica Acta ◽

10.1016/j.tca.2008.09.006 ◽

2008 ◽

Vol 479 (1-2) ◽

pp. 17-27 ◽

Cited By ~ 21

Author(s):

Ramesh L. Gardas ◽

Shantilal Oswal

Keyword(s):

Experimental Data ◽

Transport Properties ◽

Ternary Mixtures ◽

Data Correlation ◽

Eras Model

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CO2 Induced Foaming Behavior of Polystyrene near the Glass Transition

International Journal of Polymer Science ◽

10.1155/2017/7804743 ◽

2017 ◽

Vol 2017 ◽

pp. 1-15

Author(s):

Salah Al-Enezi

Keyword(s):

Experimental Data ◽

High Pressure ◽

Glass Transition ◽

Dissolved Gas ◽

Foaming Process ◽

Foaming Behavior ◽

Potential Applications ◽

Model C ◽

Parameter Values ◽

Good Agreement

This paper examines the effect of high-pressure carbon dioxide on the foaming process in polystyrene near the glass transition temperature and the foaming was studied using cylindrical high-pressure view cell with two optical windows. This technique has potential applications in the shape foaming of polymers at lower temperatures, dye impregnation, and the foaming of polystyrene. Three sets of experiments were carried out at operating temperatures of 50, 70, and 100°C, each over a range of pressures from 24 to 120 bar. Foaming was not observed when the polymer was initially at conditions below Tg but was observed above Tg. The nucleation appeared to occur randomly leading to subsequent bubble growth from these sites, with maximum radius of 0.02–0.83 mm. Three models were applied on the foaming experimental data. Variable diffusivity and viscosity model (Model C) was applied to assess the experimental data with the WLF equation. The model shows very good agreement by using realistic parameter values. The expansion occurs by diffusion of a dissolved gas from the supersaturated polymer envelope into the bubble.

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HPHT synthesis and enhanced TE performance of Te and Sn/Se elements binary-doped CoSb3

Functional Materials Letters ◽

10.1142/s1793604718501059 ◽

2019 ◽

Vol 12 (01) ◽

pp. 1850105 ◽

Cited By ~ 1

Author(s):

Hairui Sun ◽

Pin Lv ◽

Chao Wang ◽

Yunxian Liu ◽

Xiaopeng Jia ◽

...

Keyword(s):

Experimental Data ◽

Thermal Conductivity ◽

High Pressure ◽

High Temperature ◽

Seebeck Coefficient ◽

Grain Boundaries ◽

Preparation Methods ◽

Synthesis Time ◽

Lattice Disorder ◽

Positive Effect

A series of binary-doped CoSb3 with Te and Se/Sn bulk compounds Co4Sb[Formula: see text]TexSny/Sey ([Formula: see text] and 0.6, [Formula: see text] and 0.3), have been successfully prepared via a simple high pressure and high-temperature (HPHT) method. And, the influence of the doping elements on the microstructure of the samples synthesized under diverse pressures and the corresponding TE performance were studied in detail. Comparing with other preparation methods, the synthesis time of HPHT was acutely shortened. The obtained samples contain more grain boundaries, lattice disorder, dislocations and the possible “nanodot”, which have positive effect on reducing thermal conductivity. The experimental data indicate that the absolute values of Seebeck coefficient increases with pressure. What’s more, the thermal conductivities show a monotone decreasing trend as the synthesis pressure rises. The minimum value obtained is 1.93[Formula: see text]Wm[Formula: see text]K[Formula: see text] at normal temperature for Co4Sb[Formula: see text]Te[Formula: see text]Se[Formula: see text] prepared under 3[Formula: see text]GPa.

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Comparison of 3D Unsteady Transient Conjugate Heat Transfer Analysis on a High Pressure Cooled Turbine Stage With Experimental Data

Volume 5A: Heat Transfer ◽

10.1115/gt2017-64596 ◽

2017 ◽

Author(s):

Jong-Shang Liu ◽

Mark C. Morris ◽

Malak F. Malak ◽

Randall M. Mathison ◽

Michael G. Dunn

Keyword(s):

Heat Transfer ◽

Experimental Data ◽

Heat Flux ◽

High Pressure ◽

High Temperature ◽

Gas Turbine ◽

Conjugate Heat Transfer ◽

Turbine Rotor ◽

Turbine Stage ◽

Cooling Flow

In order to have higher power to weight ratio and higher efficiency gas turbine engines, turbine inlet temperatures continue to rise. State-of-the-art turbine inlet temperatures now exceed the turbine rotor material capability. Accordingly, one of the best methods to protect turbine airfoil surfaces is to use film cooling on the airfoil external surfaces. In general, sizable amounts of expensive cooling flow delivered from the core compressor are used to cool the high temperature surfaces. That sizable cooling flow, on the order of 20% of the compressor core flow, adversely impacts the overall engine performance and hence the engine power density. With better understanding of the cooling flow and accurate prediction of the heat transfer distribution on airfoil surfaces, heat transfer designers can have a more efficient design to reduce the cooling flow needed for high temperature components and improve turbine efficiency. This in turn lowers the overall specific fuel consumption (SFC) for the engine. Accurate prediction of rotor metal temperature is also critical for calculations of cyclic thermal stress, oxidation, and component life. The utilization of three-dimensional computational fluid dynamics (3D CFD) codes for turbomachinery aerodynamic design and analysis is now a routine practice in the gas turbine industry. The accurate heat-transfer and metal-temperature prediction capability of any CFD code, however, remains challenging. This difficulty is primarily due to the complex flow environment of the high-pressure turbine, which features high speed rotating flow, coupling of internal and external unsteady flows, and film-cooled, heat transfer enhancement schemes. In this study, conjugate heat transfer (CHT) simulations are performed on a high-pressure cooled turbine stage, and the heat flux results at mid span are compared to experimental data obtained at The Ohio State University Gas Turbine Laboratory (OSUGTL). Due to the large difference in time scales between fluid and solid, the fluid domain is simulated as steady state while the solid domain is simulated as transient in CHT simulation. This paper compares the unsteady and transient results of the heat flux on a high-pressure cooled turbine rotor with measurements obtained at OSUGTL.

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