The role of convective transport in the dissolution or growth of a gas bubble

1980 ◽  
Vol 72 (12) ◽  
pp. 6811-6813 ◽  
Author(s):  
R. Shankar Subramanian ◽  
Michael C. Weinberg
Keyword(s):  
Convective Transport ◽  
Gas Bubble

The role of sediment structure in gas bubble storage and release

2016 ◽  
Vol 121 (7) ◽  
pp. 1992-2005 ◽  
Author(s):  
L. Liu ◽  
J. Wilkinson ◽  
K. Koca ◽  
C. Buchmann ◽  
A. Lorke
Keyword(s):  
Gas Bubble ◽  
Sediment Structure

scholarly journals Atmospheric CO2 budget over the Amazon basin: the role of convective systems

2011 ◽  
Vol 26 (4) ◽  
pp. 529-540
Author(s):  
Valdir Herrmann ◽  
Saulo Ribeiro de Freitas
Keyword(s):  
Amazon Basin ◽  
Transport Model ◽  
Conservation Equation ◽  
Atmospheric Modeling ◽  
Convective Transport ◽  
Atmospheric Co2 ◽  
Moist Convection ◽  
Convective Systems ◽  
Deep Moist Convection

This work studies the atmospheric CO2 budget in the Amazon basin, focusing on the role of shallow and deep convective systems. The vertical redistribution of CO2 is numerically simulated using an Eulerian transport model coupled to the Brazilian developments on the Regional Atmospheric Modeling System (BRAMS). The transport model includes grid-scale advection, diffusion in the PBL (Planetary Boundary Layer) and convective transport by sub-grid shallow and deep moist convection. In the simulation, the mass conservation equation is solved for six tracers, including or not the shallow and deep moist convection terms. The rectifier effect is also showed through simulation of the transport to the free troposphere of PBL air masses with low CO2 concentrations due to assimilation by vegetation during the afternoon, when both CO2 fixation and convection are at their peak. The model is applied to simulate July 2001 with a 30 km grid resolution covering the northwest part of South America. We compare the model results with airborne CO2 observations collected in the Amazon basin during the 2001 CLAIRE field campaign.

Non-uniform nanoparticle concentration effects on moving plate boundary layer

2016 ◽  
Vol 94 (11) ◽  
pp. 1222-1227 ◽  
Author(s):  
A. Mehmood ◽  
M. Usman
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Plate Boundary ◽  
Convective Transport ◽  
Physical Parameters ◽  
Nanoparticle Concentration ◽  
Concentration Effects ◽  
Moving Plate ◽  
Layer Flow

The inclusion of small nano-sized particles in a pure fluid changes the material properties of the resulting mixture, called a nanofluid, significantly. To understand the role of material particles on the convection process one needs an efficient modeling of the nanofluid. The homogeneous modeling is observed to underpredict the rate of heat transfer. This fact motivates the utilization of non-homogeneous modeling. In this study we considered the classical Sakiadis moving plate boundary layer flow of a nanofluid. Non-homogeneous concentration, which is a consequence of convective transport of nanoparticles within the boundary layer, has been utilized to calculate the heat transfer enhancement. Effects of different physical parameters have been investigated on the expedition of heat transfer phenomena. It is noted that significant increase in the rate of heat transfer is observed when the nanoparticle concentration is non-uniform across the boundary layer.

On the Formation of Tropopause Folds and Constituent Gradient Enhancement Near Westerly Jets

2021 ◽  
Author(s):  
Matthew H. Hitchman ◽  
Shellie M. Rowe
Keyword(s):  
Water Vapor ◽  
Convective Transport ◽  
University Of Wisconsin ◽  
Fundamental Cause ◽  
Differential Advection ◽  
The University ◽  
Gradient Enhancement ◽  
Jet Streak ◽  
Westerly Jets

AbstractThe role of differential advection in creating tropopause folds and strong constituent gradients near midlatitude westerly jets is investigated using the University of Wisconsin Non-hydrostatic Modeling System (UWNMS). Dynamical structures are compared with aircraft observations through a fold and subpolar jet (SPJ) during RF04 of the Stratosphere-Troposphere Analyses of Regional Transport (START08) campaign. The observed distribution of water vapor and ozone during RF04 provides evidence of rapid transport in the SPJ, enhancing constituent gradients above relative to below the intrusion. The creation of a tropopause fold by quasi-isentropic differential advection on the upstream side of the trough is described. This fold was created by a southward jet streak in the SPJ, where upper tropospheric air displaced the tropopause eastward in the 6-10 km layer, thereby overlying stratospheric air in the 3-6 km layer. The subsequent superposition of the subtropical and subpolar jets is also shown to result from quasi-isentropic differential advection.The occurrence of low values of ozone, water vapor, and potential vorticity on the equatorward side of the SPJ can be explained by convective transport of low-ozone air from the boundary layer, dehydration in the updraft, and detrainment of inertially-unstable air in the outflow layer. An example of rapid juxtaposition with stratospheric air in the jet core is shown for RF01. The net effect of upstream convective events is suggested as a fundamental cause of the strong constituent gradients observed in midlatitude jets. Idealized diagrams illustrate the role of differential advection in creating tropopause folds and constituent gradient enhancement.

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