Novel technique for investigating the temperature effect on the diffusion coefficient of naphthalene into air

1996 ◽  
Vol 67 (8) ◽  
pp. 2831-2836 ◽  
Author(s):  
Ping‐Hei Chen ◽  
Jr‐Ming Miao ◽  
Ching‐Sung Jian
Keyword(s):  
Diffusion Coefficient ◽  
Temperature Effect ◽  
Novel Technique

Novel Technique for Direct Measurement of the Plasma Diffusion Coefficient in Magnetized Plasma

2008 ◽  
Vol 48 (5-7) ◽  
pp. 418-423 ◽  
Author(s):  
J. Brotánková ◽  
E. Martines ◽  
J. Adámek ◽  
J. Stöckel ◽  
G. Popa ◽  
...  
Keyword(s):  
Diffusion Coefficient ◽  
Direct Measurement ◽  
Magnetized Plasma ◽  
Novel Technique ◽  
Plasma Diffusion

Influence of the Temperature on the Diffusion Coefficient Value during the Cobalt Electrodeposition on Different Substrates

2014 ◽  
Vol 976 ◽  
pp. 144-147
Author(s):  
Nancy Ramos Lora ◽  
Luis Humberto Mendoza Huizar ◽  
Clara Hilda-Rios-Reyes ◽  
Carlos Andrés Galán-Vidal
Keyword(s):  
Activation Energy ◽  
Diffusion Coefficient ◽  
Temperature Effect ◽  
Glassy Carbon ◽  
Arrhenius Equation ◽  
Voltammetric Techniques ◽  
Different Temperatures ◽  
Cobalt Electrodeposition

Cobalt electrodeposition on palladium and glassy carbon was studied at different temperatures by using voltammetric techniques. Temperature effect on the diffusion coefficient value was analyzed. The results clearly showed that cobalt electrodeposition is a diffusioncontrolled process. The temperature effect on the values of the diffusion coefficient was analyzed through the Arrhenius equation. The value of the activation energy was calculated as 21.56 kJ mol-1and 25.73 kJ mol1for palladium and glassy carbon respectively.

scholarly journals Novel technique to measure mutual bulk fluid diffusion using NMR 1-D gradient

2020 ◽  
Vol 146 ◽  
pp. 03007
Author(s):  
Son Dang ◽  
Carl Sondergeld ◽  
Chandra Rai
Keyword(s):  
High Pressure ◽  
Porous Media ◽  
Diffusion Coefficient ◽  
Effective Diffusion ◽  
Hydrogen Index ◽  
Accurate Estimation ◽  
Bulk Fluid ◽  
Novel Technique ◽  
Small Pore ◽  
Fluid Diffusion

Many modelling and theoretical studies have shown that diffusion can be a significant transport mechanism in low-permeability porous media. Understanding the process allows engineers to better predict reservoir performance during both primary production and enhanced recovery in unconventional reservoirs. Direct measurement of effective diffusion in tight rocks is difficult, due to small pore volumes and the lack of techniques to actually monitor the process. Conventional diffusion measurements generally require fluid sampling, which induces a pressure transient which changes the mass transfer mechanism. Previously, we introduced a novel technique to measure tortuosity in nano-porous media by simultaneously monitoring methane versus nitrogen concentrations at high pressure using transmission Infrared Spectroscopy (IR). To complete the estimation of effective diffusion, bulk fluid diffusion coefficient also needs to be measured. In this study, we demonstrate the usage of Nuclear Magnetic Resonance (NMR) 1-D imaging to examine the dynamic change of Hydrogen Index (HI) across the interface between two bulk fluids. The experiment was conducted between a crude oil sample and methane; fluid samples were pressurized within an NMR transparent ZrO2 pressure cell which operates at pressures up to 10,000 psi. The Hydrogen Index (HI) profile was continuously measured and recorded for 7 days. The results provided oil the swelling factor and the concentration profile as a function of both time and distance. These data then were fitted with Maxwell-Stefan equation to precisely back calculate the diffusion coefficient between oil and gas samples at high pressure. Accurate estimation of tortuosity and fluid diffusion is critical for the gas injection strategy in a shale formation. Greater tortuosity and smaller fluid diffusion rate lead to longer injection and production times for desirable economic recovery.

Diffusive Mass Transfer during Drying of Grinded Sunflower Stalks

2016 ◽  
Vol 10 (4) ◽  
pp. 459-463 ◽  
Author(s):  
Roman Hosovkyi ◽  
◽  
Diana Kindzera ◽  
Volodymyr Atamanyuk ◽  
◽  
...  
Keyword(s):  
Mass Transfer ◽  
Diffusion Coefficient ◽  
Temperature Effect ◽  
Effective Diffusion Coefficient ◽  
Effective Diffusion ◽  
Diffusive Mass Transfer ◽  
Sunflower Stalks ◽  
Diffusive Processes

Diffusive mass transfer has been studied during drying of grinded sunflower stalks to produce fuel briquettes. Theoretical aspects of diffusive processes during filtration drying have been analyzed. The process of diffusive mass transfer during drying of grinded sunflower stalks particles of prismatic shape has been mathematically described. The temperature effect on effective diffusion coefficient has been examined.

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