Thermopower of Bi Nanowire Array Composites.

2000 ◽  
Vol 626 ◽  
Author(s):  
T.E. Huber ◽  
M.J. Graf ◽  
C.A. Foss ◽  
P. Constant
Keyword(s):  
High Pressure ◽  
Seebeck Coefficient ◽  
Contact Resistance ◽  
Nanowire Array ◽  
High Mobility ◽  
Nanowire Arrays ◽  
Pressure Injection ◽  
Dense Arrays ◽  
Bi Nanowire ◽  
High Pressure Injection

The small effective mass and high mobility of electrons in Bi, make Bi nanowires a promising system for thermoelectric applications. Dense arrays of 20–200 nm diameter Bi nanowires were fabricated by high pressure injection of the melt. Transport properties and Seebeck coefficient were investigated for Bi nanowires with various wire diameters as a function of temperature (1 K < T < 300 K) and magnetic fields (B < 0.6 T). We discuss the problem of the contact resistance of Bi nanowire arrays.

Processing, Characterization, and Measurement of the Seebeck Coefficient of Bismuth Microwire Array Composites

2000 ◽  
Vol 626 ◽  
Author(s):  
T.E. Huber ◽  
P. Constant
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
Seebeck Coefficient ◽  
Room Temperature ◽  
Volume Fraction ◽  
Lattice Plane ◽  
Crystalline Orientation ◽  
Pressure Injection ◽  
The Individual ◽  
High Pressure Injection

ABSTRACTWe have fabricated Bi microwire array composites ranging in diameter from 10 to 50 micrometer using the method of high-pressure-injection (HPI) of the Bi melt into microchannel arrays (MCA) templates. The composites are dense, with Bi volume fraction in excess of 70 %. The parallel Bi nanowires, whose length appears to be limited only by the thickness of the host template (up to 2 mm), terminate at both sides of the composite in the Bi bulk. The individual Bi microwire crystal structure is rhombohedral, with the same lattice parameters as that of bulk Bi; the wires crystalline orientation is predominantly perpendicular to the (113) lattice plane. The transversal magnetoresistance and Seebeck effect of the wires has been measured in magnetic fields up to 0.8 Tesla and for temperatures ranging between 77 K and room temperature.

A Numerical Investigation on Mixing Characteristics of Natural Gas Jets With High-Pressure Injection

2021 ◽  
Author(s):  
Long Liu ◽  
Tianyang Dai ◽  
Qian Xiong ◽  
Yuehua Qian ◽  
Bo Liu
Keyword(s):  
High Pressure ◽  
Natural Gas ◽  
Air Entrainment ◽  
Gas Jet ◽  
Swirl Ratio ◽  
Marine Engine ◽  
Low Speed ◽  
Pressure Injection ◽  
Mixing Characteristics ◽  
High Pressure Injection

Abstract With increasingly stringent emissions limitation of greenhouse gas and atmospheric pollutants for ship, the direct injection of natural gas on the cylinder head with high-pressure injection is an effective method to make a high power output and decrease harmful gas emissions in marine natural gas dual fuel engines. However, the effects on mixing characteristics of high-pressure natural gas underexpanded jet have not been fully understood. Especially, the injection pressure is up to 30 MPa with large injection quantity and critical surrounding gas conditions for the low-speed two-stroke marine engine. Therefore, this research is focused on the flow and mixing process of the natural gas jet with high-pressure injection under the in-cylinder conditions of low-speed two-stroke marine engine. The gas jet penetration, the distribution of velocity and density, the equivalence ratio and air entrainment have been analyzed under different nozzle hole diameters by numerical simulation. The effects of surrounding gas conditions including pressure, temperature and swirl ratio on air entrainment and equivalence ratio distribution were studied in detail. From the numerical simulation, it is found that the mixing characteristics of natural gas jet can be improved under in-cylinder conditions of higher ambient temperature and swirl ratio, which is relevant to the low-speed two-stroke marine engine.

scholarly journals High-Pressure Injection Injuries from Thinners. A Case Report.

1998 ◽  
Vol 47 (3) ◽  
pp. 995-997
Author(s):  
Goichi Okahara ◽  
Hiroshi Hokama ◽  
Kunihiko Uehara ◽  
Fuminori Kanaya
Keyword(s):  
High Pressure ◽  
Case Report ◽  
Pressure Injection ◽  
High Pressure Injection

Understanding High-pressure Injection Primary Breakup by Using Large Eddy Simulation and X-ray Spray Imaging

MTZ worldwide ◽  
2017 ◽  
Vol 78 (5) ◽  
pp. 50-57 ◽  
Author(s):  
Junmei Shi ◽  
Pablo Lopez Aguado ◽  
Noureddine Guerrassi ◽  
Gavin Dober
Keyword(s):  
High Pressure ◽  
Large Eddy Simulation ◽  
X Ray ◽  
Eddy Simulation ◽  
Pressure Injection ◽  
Large Eddy ◽  
Primary Breakup ◽  
High Pressure Injection
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