Computer-assisted optimization of selectivity by tuning temperature and carrier gas pressure drop in two GC capillary columns coupled in series

1990 ◽  
Vol 102 (1-3) ◽  
pp. 1-10 ◽  
Author(s):  
Eva Benická ◽  
Ján Krupčik ◽  
Peter Kuljovský ◽  
Dušan Repka ◽  
Ján Garaj
Keyword(s):  
Pressure Drop ◽  
Capillary Columns ◽  
Gas Pressure ◽  
Computer Assisted ◽  
Carrier Gas ◽  
In Series

The influence of carrier gas pressure on the retention of sorbates on monolithic capillary columns in gas chromatography

2009 ◽  
Vol 83 (4) ◽  
pp. 670-676 ◽  
Author(s):  
A. A. Korolev ◽  
V. E. Shiryaeva ◽  
T. P. Popova ◽  
A. V. Kozin ◽  
A. A. Kurganov
Keyword(s):  
Gas Chromatography ◽  
Capillary Columns ◽  
Gas Pressure ◽  
Carrier Gas ◽  
Monolithic Capillary Columns

Experimental measurements of gas pressure drop of packed pebble beds

2020 ◽  
Vol 160 ◽  
pp. 111836
Author(s):  
Maulik Panchal ◽  
Abhishek Saraswat ◽  
Paritosh Chaudhuri
Keyword(s):  
Pressure Drop ◽  
Gas Pressure ◽  
Experimental Measurements

A 3D Unsteady Flow Analysis in a Doubly Constricted Tube

2000 ◽  
Author(s):  
B. V. Rathish Kumar ◽  
T. Yamaguchi ◽  
H. Liu ◽  
R. Himeno
Keyword(s):  
Pressure Drop ◽  
Unsteady Flow ◽  
Stokes Equations ◽  
Vortex Formation ◽  
Flow Analysis ◽  
Three Dimensional ◽  
Navier Stokes ◽  
Navier Stokes Equations ◽  
In Series ◽  
3D Unsteady Flow

Abstract Unsteady flow dynamics in a doubly constricted vessel is analyzed by using a time accurate Finite Volume solution of three dimensional incompressible Navier-Stokes equations. Computational experiments are carried out for various values of Reynolds number in order to assess the criticality of multiple mild constrictions in series and also to bring out the subtle 3D features like vortex formation. Studies reveal that pressure drop across a series of mild constrictions can get physiologically critical. Further this pressure drop is found to be sensitive to the spacing between the constrictions and also to the oscillatory nature of the inflow profile.

Understanding Carbon Dioxide Transfer in Direct Methanol Fuel Cells Using a Pore-Scale Model

2021 ◽  
Vol 19 (1) ◽  
Author(s):  
Nathaniel Metzger ◽  
Archana Sekar ◽  
Jun Li ◽  
Xianglin Li
Keyword(s):  
Carbon Dioxide ◽  
Pressure Drop ◽  
Gas Flow ◽  
Direct Methanol Fuel Cells ◽  
Gas Pressure ◽  
Mass Transfer Resistance ◽  
Transfer Resistance ◽  
Cell Components ◽  
Direct Methanol ◽  
Methanol Fuel Cells

Abstract The gas flow of carbon dioxide from the catalyst layer (CL) through the microporous layer (MPL) and gas diffusion layer (GDL) has great impacts on the water and fuel management in direct methanol fuel cells (DMFCs). This work has developed a liquid–vapor two-phase model considering the counter flow of carbon dioxide gas, methanol, and water liquid solution in porous electrodes of DMFC. The model simulation includes the capillary pressure as well as the pressure drop due to flow resistance through the fuel cell components. The pressure drop of carbon dioxide flow is found to be about two to three orders of magnitude higher than the pressure drop of the liquid flow. The big difference between liquid and gas pressure drops can be explained by two reasons: volume flowrate of gas is three orders of magnitude higher than that of liquid; only a small fraction of pores (<5%) in hydrophilic fuel cell components are available for gas flow. Model results indicate that the gas pressure and the mass transfer resistance of liquid and gas are more sensitive to the pore size distribution than the thickness of porous components. To buildup high gas pressure and high mass transfer resistance of liquid, the MPL and CL should avoid micro-cracks during manufacture. Distributions of pore size and wettability of the GDL and MPL have been designed to reduce the methanol crossover and improve fuel efficiency. The model results provide design guidance to obtain superior DMFC performance using highly concentrated methanol solutions or even pure methanol.

The Production of Electrochromatography Capillary Columns Using Gas Pressure Powered Dry-Packing Method

2003 ◽  
Vol 36 (7) ◽  
pp. 1411-1421 ◽  
Author(s):  
Changqiao Zhang ◽  
Chenfu Zhu ◽  
Xiuli Lin ◽  
Yunhe Wei
Keyword(s):  
Capillary Columns ◽  
Gas Pressure ◽  
Packing Method

Carrier-gas pressure

Nucleation ◽  
2000 ◽  
pp. 330-337
Author(s):  
Dimo Kashchiev
Keyword(s):  
Gas Pressure ◽  
Carrier Gas
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