Theoretical and experimental study of electrochemical reactors with three-dimensional bipolar electrodes

2009 ◽  
Vol 40 (3) ◽  
pp. 709-718 ◽  
Author(s):  
O. González Pérez ◽  
J. M. Bisang
Keyword(s):  
Experimental Study ◽  
Three Dimensional ◽  
Electrochemical Reactors ◽  
Bipolar Electrodes

Obstacle drag in stratified flow

1990 ◽  
Vol 429 (1876) ◽  
pp. 119-140 ◽  
Keyword(s):  
Experimental Study ◽  
Linear Density ◽  
Three Dimensional ◽  
Inviscid Flow ◽  
Force Balance ◽  
Video Recordings ◽  
Lee Waves ◽  
Time Variations ◽  
Obstacle Height ◽  
Stable Linear

This paper describes an experimental study of the drag of two- and three-dimensional bluff obstacles of various cross-stream shapes when towed through a fluid having a stable, linear density gradient with Brunt-Vaisala frequency, N . Drag measurements were made directly using a force balance, and effects of obstacle blockage ( h / D , where h and D are the obstacle height and the fluid depth, respectively) and Reynolds number were effectively eliminated. It is shown that even in cases where the downstream lee waves and propagating columnar waves are of large amplitude, the variation of drag with the parameter K ( = ND /π U ) is qualitatively close to that implied by linear theories, with drag minima existing at integral values of K . Under certain conditions large, steady, periodic variations in drag occur. Simultaneous drag measurements and video recordings of the wakes show that this unsteadiness is linked directly with time-variations in the lee and columnar wave amplitudes. It is argued that there are, therefore, situations where the inviscid flow is always unsteady even for large times; the consequent implications for atmospheric motions are discussed.

scholarly journals An experimental study of secondary oil migration in a three-dimensional tilted porous medium

AAPG Bulletin ◽  
2012 ◽  
Vol 96 (5) ◽  
pp. 773-788 ◽  
Author(s):  
Jianzhao Yan ◽  
Xiaorong Luo ◽  
Weimin Wang ◽  
Renaud Toussaint ◽  
Jean Schmittbuhl ◽  
...  
Keyword(s):  
Experimental Study ◽  
Porous Medium ◽  
Three Dimensional ◽  
Oil Migration

An experimental study of the influence of riblets on transition

1996 ◽  
Vol 315 ◽  
pp. 31-49 ◽  
Author(s):  
G. R. Grek ◽  
V. V. Kozlov ◽  
S. V. Titarenko
Keyword(s):  
Experimental Study ◽  
Three Dimensional ◽  
Negative Influence ◽  
Positive Influence ◽  
Linear Stage ◽  
Turbulent Transition ◽  
Transition Structures ◽  
Stage Transition ◽  
Tollmien Schlichting ◽  
Laminar Turbulent Transition

An experimental study of the effect of riblets on three-dimensional nonlinear structures, the so-called Λ-vortices on laminar-turbulent transition showed that riblets delay the transformation of the Λ-vortices into turbulent spots and shift the point of transition downstream. This result is opposite to the negative influence of such ribbed surfaces on two-dimensional linear Tollmien-Schlichting waves (the linear stage of transition). Thus, the ribbed surface influences laminar-turbulent transition structures differently: a negative influence on the linear-stage transition structures and a positive influence on the nonlinear-stage transition structures. It is demonstrated that transition control by means of riblets requires special attention to be paid to the choice of their location, taking into account the stage of transition.

scholarly journals Development of a model for the characterization of fluid dispersion in electrochemical reactors

2002 ◽  
Vol 4 (4) ◽  
pp. 281-295 ◽  
Author(s):  
Jose González-García ◽  
Angel Frías-Ferrer ◽  
Vicente Montiel ◽  
Antonio Aldaz ◽  
Juan A. Conesa
Keyword(s):  
Time Distribution ◽  
Three Dimensional ◽  
Electrochemical Reactions ◽  
Conductivity Measurements ◽  
Characteristic Parameters ◽  
Electrochemical Reactors ◽  
Stimulus Response ◽  
Hydrodynamic Behaviour ◽  
Matlab Program

This paper analyses the hydrodynamic behaviour of electrochemical reactors by simulating stimulus–response experiments. The experiments were performed with a simple experimental arrangement to generate data (Residence Time Distribution (RTD) curves) from electrolytic conductivity measurements. The multiparametric model proposed and the Matlab program developed allow the study of electrochemical reactors using three-dimensional electrodes, providing values of characteristic parameters of the materials, such as porosity and compressibility. The study of the reactor also permits modelling of the electrochemical reactions that will be produced inside it.

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