scholarly journals Flow Generation by a Piezoelectric Fan

2017 ◽  
Author(s):  
Myung Hun Oh ◽  
Heungsu Jeon ◽  
Minsuk Choi
Keyword(s):  
Flow Generation

scholarly journals Continuous dimethyldioxirane generation for polymer epoxidation

2021 ◽  
Vol 12 (4) ◽  
pp. 489-493
Author(s):  
Grace P. Ahlqvist ◽  
Eileen G. Burke ◽  
Jeremiah A. Johnson ◽  
Timothy F. Jamison
Keyword(s):  
Continuous Flow ◽  
Low Level ◽  
Flow Generation

Herein we describe the development of a reactor for the continuous flow generation and use of dimethyldioxirane (DMDO) and its application to the low-level epoxidation of unsaturated polymers.

Large Eddy Simulation of the Wake Behind a Turning Ship

2002 ◽  
Author(s):  
Ibrahim Yavuz ◽  
Zeynep N. Cehreli ◽  
Ismail B. Celik ◽  
Shaoping Shi
Keyword(s):  
Large Eddy Simulation ◽  
Sensitivity Study ◽  
West Virginia University ◽  
Vortical Structures ◽  
Turbulence Structures ◽  
Eddy Simulation ◽  
Flow Generation ◽  
Large Eddy ◽  
Unsteady Inflow ◽  
Random Flow

This study examines the dynamics of turbulent flow in the wake of a turning ship using the large eddy simulation (LES) technique. LES is applied in conjunction with a random flow generation (RFG) technique originally developed at West Virginia University to provide unsteady inflow boundary conditions. As the ship is turning, the effects of the Coriolis and centrifugal forces on vortical structures are included. The effects of the Coriolis force on the flow-field are assessed and a grid sensitivity study is performed. The predicted turbulence structures are analyzed and compared with the wake of a non-turning ship.

scholarly journals Incipient subsurface heterogeneity and its effect on overland flow generation – insight from a modeling study of the first experiment at the Biosphere 2 Landscape Evolution Observatory

2014 ◽  
Vol 18 (5) ◽  
pp. 1873-1883 ◽  
Author(s):  
G.-Y. Niu ◽  
D. Pasetto ◽  
C. Scudeler ◽  
C. Paniconi ◽  
M. Putti ◽  
...  
Keyword(s):  
Null Hypothesis ◽  
Overland Flow ◽  
Landscape Evolution ◽  
Alternative Hypothesis ◽  
Biosphere 2 ◽  
Subsurface Heterogeneity ◽  
Flow Generation ◽  
Heterogeneous Soil ◽  
Seepage Face ◽  
Modeling Study

Abstract. Evolution of landscape heterogeneity is controlled by coupled Earth system dynamics, and the resulting process complexity is a major hurdle to cross towards a unified theory of catchment hydrology. The Biosphere 2 Landscape Evolution Observatory (LEO), a 334.5 m2 artificial hillslope built with homogeneous soil, may have evolved into heterogeneous soil during the first experiment driven by an intense rainfall event. The experiment produced predominantly seepage face water outflow, but also generated overland flow, causing superficial erosion and the formation of a small channel. In this paper, we explore the hypothesis of incipient heterogeneity development in LEO and its effect on overland flow generation by comparing the modeling results from a three-dimensional physically based hydrological model with measurements of total mass change and seepage face flow. Our null hypothesis is that the soil is hydraulically homogeneous, while the alternative hypothesis is that LEO developed downstream heterogeneity from transport of fine sediments driven by saturated subsurface flow. The heterogeneous case is modeled by assigning saturated hydraulic conductivity at the LEO seepage face (Ksat,sf) different from that of the rest (Ksat). A range of values for Ksat, Ksat,sf, soil porosity, and pore size distribution is used to account for uncertainties in estimating these parameters, resulting in more than 20 000 simulations. It is found that the best runs under the heterogeneous soil hypothesis produce smaller errors than those under the null hypothesis, and that the heterogeneous runs yield a higher probability of best model performance than the homogeneous runs. These results support the alternative hypothesis of localized incipient heterogeneity of the LEO soil, which facilitated generation of overland flow. This modeling study of the first LEO experiment suggests an important role of coupled water and sediment transport processes in the evolution of subsurface heterogeneity and on overland flow generation, highlighting the need of a coupled modeling system that integrates across disciplinary processes.

Quantification of Hortonian overland flow generation and soil erosion in a Central European low mountain range using rainfall experiments

CATENA ◽  
2014 ◽  
Vol 113 ◽  
pp. 202-212 ◽  
Author(s):  
V. Butzen ◽  
M. Seeger ◽  
S. Wirtz ◽  
M. Huemann ◽  
C. Mueller ◽  
...  
Keyword(s):  
Soil Erosion ◽  
Overland Flow ◽  
Mountain Range ◽  
Central European ◽  
Flow Generation ◽  
Low Mountain Range

Reynolds stress and shear flow generation

2001 ◽  
Vol 43 (10) ◽  
pp. 1377-1395 ◽  
Author(s):  
S B Korsholm ◽  
P K Michelsen ◽  
V Naulin ◽  
J Juul Rasmussen ◽  
L Garcia ◽  
...  
Keyword(s):  
Shear Flow ◽  
Reynolds Stress ◽  
Flow Generation

scholarly journals Rainfall Thresholds for Flow Generation in Desert Ephemeral Streams

2018 ◽  
Vol 54 (12) ◽  
pp. 9935-9950 ◽  
Author(s):  
Stephanie K. Kampf ◽  
Joshua Faulconer ◽  
Jeremy R. Shaw ◽  
Michael Lefsky ◽  
Joseph W. Wagenbrenner ◽  
...  
Keyword(s):  
Ephemeral Streams ◽  
Rainfall Thresholds ◽  
Flow Generation
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