scholarly journals Low-parametric equation for calculating the viscosity coefficient of sulfur hexafluoride

2019 ◽  
Vol 1382 ◽  
pp. 012180
Author(s):  
A B Kaplun ◽  
A B Meshalkin ◽  
O S Dutova
Keyword(s):  
Sulfur Hexafluoride ◽  
Viscosity Coefficient ◽  
Parametric Equation

scholarly journals Low -parametric equation for calculating the viscosity coefficient of nitrogen in liquid, gas and fluid states

2021 ◽  
Vol 2119 (1) ◽  
pp. 012143
Author(s):  
O S Dutova ◽  
A B Meshalkin
Keyword(s):  
Energy Density ◽  
Internal Energy ◽  
Viscosity Coefficient ◽  
Parametric Equation ◽  
New Correlation

Abstract The formulation for the viscosity coefficient of nitrogen is obtained. In the developed equation the dependence of the residua viscosity of various states of substance on the internal energy density is used. The new correlation represents the viscosity of nitrogen at temperatures from 70 K to 1000 K and pressures of up to 50 MPa within the limits of experimental uncertainties.

EQUIPMENT FOR MAINTENANCE OF HIGH-VOLTAGE DEVICES WITH SULFUR HEXAFLUORIDE (SF6) INSULATION

2015 ◽  
pp. 42-45
Author(s):  
V.B. Moskalenko ◽  
◽  
I.G. Chizhov ◽  
O.V. Varakin ◽  
Y.A. Pavlenko ◽  
...  
Keyword(s):  
High Voltage ◽  
Sulfur Hexafluoride

EXPERIMENTAL PHASE EQUILIBRIUM OF SULFUR HEXAFLUORIDE AND MINERAL OIL

2020 ◽  
Author(s):  
Afonso Ferreira Miguel Junior ◽  
Luiz Fernando Santos de Vasconcelos ◽  
Celina Kakitani ◽  
césar yutaka ofuchi ◽  
Moisés Marcelino Neto ◽  
...  
Keyword(s):  
Phase Equilibrium ◽  
Sulfur Hexafluoride ◽  
Mineral Oil ◽  
Experimental Phase ◽  
Experimental Phase Equilibrium

The Pressure–Viscosity Coefficient of Several Ionic Liquids

2008 ◽  
Vol 31 (2) ◽  
pp. 107-118 ◽  
Author(s):  
A. S. Pensado ◽  
M. J. P. Comuñas ◽  
J. Fernández
Keyword(s):  
Ionic Liquids ◽  
Viscosity Coefficient

scholarly journals Sub- and Supercritical Extraction of Slovenian Hops (Humulus lupulus L.) Aurora Variety Using Different Solvents

Plants ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 1137
Author(s):  
Katja Bizaj ◽  
Mojca Škerget ◽  
Iztok Jože Košir ◽  
Željko Knez
Keyword(s):  
Sulfur Hexafluoride ◽  
Total Yield ◽  
Extraction Yield ◽  
Operating Conditions ◽  
Influence Of Process Parameters ◽  
Humulus Lupulus L ◽  
Bitter Acids ◽  
Temperature And Pressure ◽  
Carbon Dioxide Co2 ◽  
The Mathematical Model

This work investigates the efficiency of supercritical fluid extraction of hops with a variety of solvents including carbon dioxide (CO2), propane, sulfur hexafluoride (SF6), and dimethyl ether (DME) at various densities (low-density and high-density). Operating parameters were 50 bar, 100 bar and 150 bar and 20 °C, 40 °C, 60 °C and 80 °C for all solvents, respectively. The influence of process parameters on the total yield of extraction and content of bitter acids in the extracts has been investigated. The mathematical model based on Fick’s second law well described the experimental extraction results. Furthermore, HPLC analysis has been used to determine α- and β-acids in extracts. The yield of bitter compounds in hop extracts was largely influenced by the type of solvent, the temperature and pressure applied during extraction. The results show that CO2 and propane were roughly equivalent to DME in solvating power, while SF6 was a poor solvent at the same conditions. The highest yield as well as the highest concentration of bitter acids in extracts were obtained by using DME, where the optimal operating conditions were 40 °C and 100 bar for the extraction of α-acids (max. concentration 9.6%), 60 °C and 50 bar for the extraction of β-acids (4.5%) and 60 °C and 150 bar for the maximum extraction yield (25.6%).

scholarly journals Design of Road-Side Barriers to Mitigate Air Pollution near Roads

2021 ◽  
Vol 11 (5) ◽  
pp. 2391
Author(s):  
Jose I. Huertas ◽  
Javier E. Aguirre ◽  
Omar D. Lopez Mejia ◽  
Cristian H. Lopez
Keyword(s):  
Fluid Dynamics ◽  
Air Pollution ◽  
Computational Fluid Dynamics ◽  
Sulfur Hexafluoride ◽  
Computational Domain ◽  
Cfd Model ◽  
Near Surface ◽  
The Road ◽  
Pollutant Concentrations ◽  
Highly Correlated

The effects of using solid barriers on the dispersion of air pollutants emitted from the traffic of vehicles on roads located over flat areas were quantified, aiming to identify the geometry that maximizes the mitigation effect of air pollution near the road at the lowest barrier cost. Toward that end, a near road Computational Fluid Dynamics (NR-CFD) model that simulates the dispersion phenomena occurring in the near-surface atmosphere (<250 m high) in a small computational domain (<1 km long), via Computational Fluid Dynamics (CFD) was used. Results from the NR-CFD model were highly correlated (R2 > 0.96) with the sulfur hexafluoride (SF6) concentrations measured by the US-National Oceanic and Atmospheric Administration (US-NOAA) in 2008 downwind a line source emission, for the case of a 6m near road solid straight barrier and for the case without any barrier. Then, the effects of different geometries, sizes, and locations were considered. Results showed that, under all barrier configurations, the normalized pollutant concentrations downwind the barrier are highly correlated (R2 > 0.86) to the concentrations observed without barrier. The best cost-effective configuration was observed with a quarter-ellipse barrier geometry with a height equivalent to 15% of the road width and located at the road edge, where the pollutant concentrations were 76% lower than the ones observed without any barrier.

Sign in / Sign up

Export Citation Format

Share Document