scholarly journals Modelling molecular gas suspension diffusion and saturation processes in liquid media

2007 ◽  
Author(s):  
R. Groll
Keyword(s):  
Molecular Gas ◽  
Gas Suspension ◽  
Liquid Media

Mathematical Modeling of Binary Nano Scale Diffusion of Molecular Gas Suspensions in Liquid Media

2007 ◽  
Author(s):  
Rodion Groll
Keyword(s):  
Mass Flux ◽  
Present Model ◽  
Diffusion Processes ◽  
Molecular Gas ◽  
Mass Ratio ◽  
Liquid Media ◽  
Gas Concentration ◽  
Gas Suspensions ◽  
Concentration Changes ◽  
Gas Molecules

A model describing the suspension diffusion process of gas molecules in liquid media is presented in this paper. This process is not yet solved by a satisfactory model for micro-scale applications at this time. The new model allows the simulation of diffusion processes in continuous media considering the molecular mass flux in a suspension/carrier phase mixture. Modelling the diffusion of gas suspensions in liquid media the saturation mass ratio is reached near the liquid/gas surface very quickly. The increase of gas concentration in the liquid domain depends on the elapsed time and the physical properties of gas and liquid media. The molecular gas velocity is described by a Maxwell probability density function. Based on this spectral method macroscopic physical values are modelled to describe time-dependent global concentration changes. Modelling the gas species diffusion the molecular convection is considered. Modelling the mass flux of the molecular gas suspension characteristic time scales are developed describing the completion level of the saturation progress based on non-dimensional formulations of the molecular convection equation. The present model is implemented in a CFD code and validated by a family of parametric simulation results depending on the saturation mass ratio of the suspended gas phase. This simulation result array shows the dependency of saturation time and saturation mass ratio of the suspended gas molecules. Based on this relation macroscopic diffusion processes in micromixers and microchannels are described with this model and without an extra solution of molecule trajectories or spectral fields of molecule velocity.

Central kiloparsec of NGC 1326 observed with SINFONI

2020 ◽  
Vol 638 ◽  
pp. A53
Author(s):  
Nastaran Fazeli ◽  
Gerold Busch ◽  
Andreas Eckart ◽  
Françoise Combes ◽  
Persis Misquitta ◽  
...  
Keyword(s):  
Black Hole ◽  
Galaxy Evolution ◽  
Near Infrared ◽  
Velocity Fields ◽  
Molecular Gas ◽  
Nearby Galaxy ◽  
Stellar Content ◽  
Stellar Rotation ◽  
Supermassive Black Hole ◽  
Integral Field Spectrograph

Gas inflow processes in the vicinity of galactic nuclei play a crucial role in galaxy evolution and supermassive black hole growth. Exploring the central kiloparsec of galaxies is essential to shed more light on this subject. We present near-infrared H- and K-band results of the nuclear region of the nearby galaxy NGC 1326, observed with the integral-field spectrograph SINFONI mounted on the Very Large Telescope. The field of view covers 9″ × 9″ (650 × 650 pc2). Our work is concentrated on excitation conditions, morphology, and stellar content. The nucleus of NGC 1326 was classified as a LINER, however in our data we observed an absence of ionised gas emission in the central r ∼ 3″. We studied the morphology by analysing the distribution of ionised and molecular gas, and thereby detected an elliptically shaped, circum-nuclear star-forming ring at a mean radius of 300 pc. We estimate the starburst regions in the ring to be young with dominating ages of < 10 Myr. The molecular gas distribution also reveals an elongated east to west central structure about 3″ in radius, where gas is excited by slow or mild shock mechanisms. We calculate the ionised gas mass of 8 × 105 M⊙ completely concentrated in the nuclear ring and the warm molecular gas mass of 187 M⊙, from which half is concentrated in the ring and the other half in the elongated central structure. The stellar velocity fields show pure rotation in the plane of the galaxy. The gas velocity fields show similar rotation in the ring, but in the central elongated H2 structure they show much higher amplitudes and indications of further deviation from the stellar rotation in the central 1″ aperture. We suggest that the central 6″ elongated H2 structure might be a fast-rotating central disc. The CO(3–2) emission observations with the Atacama Large Millimeter/submillimeter Array reveal a central 1″ torus. In the central 1″ of the H2 velocity field and residual maps, we find indications for a further decoupled structure closer to a nuclear disc, which could be identified with the torus surrounding the supermassive black hole.

MEASURE AND VIZUALIZATION IN THE NEAR ZONES OF TRANSIENT ULTRASONIC FIELDS GENERATED BY BROADBAND TRANSDUCERS IN LIQUID MEDIA

1990 ◽  
Vol 51 (C2) ◽  
pp. C2-603-C2-606 ◽  
Author(s):  
E. RIERA-FRANCO DE SARABIA ◽  
A. RAMOS-FERNANDEZ ◽  
L . GOMEZ-ULLATE
Keyword(s):  
Liquid Media ◽  
Ultrasonic Fields

Kinetics of a nonequilibrium molecular gas

1988 ◽  
Vol 155 (7) ◽  
pp. 545-545
Author(s):  
Boris M. Smirnov
Keyword(s):  
Molecular Gas ◽  
Kinetics Of

Optimiza of cultural conditions in liquid media of Schizochytrium sp. PQ6 isolated from Phu Quoc island, Kien Giang province

2014 ◽  
Vol 31 (4) ◽  
Author(s):  
Ngo Thi Hoai Thu ◽  
Hoang Thi Lan Anh ◽  
Danng Diem Hong
Keyword(s):  
Liquid Media ◽  
Cultural Conditions

Concerning Stabilization of Heat Transfer of a Gas-Suspension Flow in a Tube

2003 ◽  
Vol 34 (7-8) ◽  
pp. 6 ◽  
Author(s):  
Yu. Ya. Pechenegov ◽  
O. Yu. Pechenegova
Keyword(s):  
Heat Transfer ◽  
Suspension Flow ◽  
Gas Suspension

Peculiarities of Diagnostics of the Functional State of the Unicellular Algae in the Liquid Media by Luminescent Method

2014 ◽  
Vol 50 (1) ◽  
pp. 100-106
Author(s):  
O. V. Vakulenko ◽  
O. O. Grigorieva ◽  
M. A. Berezovskaya ◽  
A. I. Datsenko
Keyword(s):  
Functional State ◽  
Liquid Media ◽  
Unicellular Algae ◽  
Luminescent Method
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