Electrochemical study of mass transfer in decaying annular swirl flow

1994 ◽  
Vol 24 (7) ◽  
pp. 685-693 ◽  
Author(s):  
S. Yapici ◽  
M. A. Patrick ◽  
A. A. Wragg
Keyword(s):  
Mass Transfer ◽  
Swirl Flow ◽  
Electrochemical Study

Swirl Flow Investigations on the Enhancement of Heat Transfer Processes in Cyclone Cooling Ducts

2012 ◽  
Author(s):  
Florian Wassermann ◽  
Sven Grundmann ◽  
Michael Kloss ◽  
Heinz-Peter Schiffer
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
Complex Structure ◽  
Three Dimensional ◽  
Swirl Flow ◽  
Flow Structures ◽  
Stable Complex ◽  
Reynolds Analogy ◽  
Transfer Processes ◽  
Cooling Ducts

Cyclone cooling is a promising method to enhance heat-transfer processes in future internal turbine-blade leading-edge cooling-ducts. The basic component of such cooling channels is the swirl generator, which induces a swirling movement of the coolant. The angular momentum generates stable, complex and three-dimensional flow structures of helical shape with alternating axial flow directions. Full three-dimensional and three-component velocity measurements using magnetic resonance velocimetry (3D3C-MRV) were conducted, with the aim to understand the complex structure of pipe flows with strong swirl. In order to mimic the effect of different installation concepts of the cyclone-cooling ducts an idealized bend-duct swirl-tube configuration with variable exit orifices has been investigated. Pronounced helical flow structures and distinct velocity zones could be found in this swirl flow. One substantial result is the identification of stationary helix-shaped streaks of high axial velocity in the direct vicinity of the wall. These findings are in good agreement with mass-transfer measurements that also show helix-shaped structures with increased mass transfer at the inner surface of the tube. According to the Reynolds analogy between heat and mass transfer, augmented heat-transfer processes in these areas are to be expected.

On a method of electrochemical study of the mass transfer in a blood medium, in laminar flow

1975 ◽  
Vol 2 (4) ◽  
pp. 351-357 ◽  
Author(s):  
A. Caprani ◽  
C. Deslouis ◽  
I. Epelboin ◽  
B. Tribollet
Keyword(s):  
Mass Transfer ◽  
Laminar Flow ◽  
Electrochemical Study

Electrochemical study of mass transfer in Li-Mg and Li-Mg-Al alloys

1987 ◽  
Vol 17 (2) ◽  
pp. 385-397 ◽  
Author(s):  
Y. Iwadate ◽  
M. Lassouani ◽  
F. Lantelme ◽  
M. Chemla
Keyword(s):  
Mass Transfer ◽  
Al Alloys ◽  
Electrochemical Study

Evaluation of Mass Transfer Coefficient Under Swirl Flow Generated by the Combination of Pipe Elements

2012 ◽  
Author(s):  
Shota Suzuki ◽  
Takao Nakamura
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Power Plants ◽  
Pipe Wall ◽  
Swirl Flow ◽  
Estimation Methods ◽  
Piping System ◽  
Pipe Failure ◽  
Wall Thinning

Flow accelerated corrosion (FAC) is the major pipe wall thinning phenomena in power plants. The management of pipe wall thinning has been carried out for pipe elements such as elbow, orifice, etc. of the piping system in power plants. It is usually applied to thinning estimation methods with a combination of analytical code and measurement of pipe wall thinning. In piping system, it is known that several pipe elements which are connected in series may generate swirl flow. Therefore the arrangement of pipe elements is considered to be one of the major reasons to affect thinning phenomena. In Mihama Unit3 pipe failure accident of 2004, it was pointed out the swirl flow caused by piping layout might influence thinning rate after orifice. This paper focuses on the conditions and parameters (combination, distance, etc. of pipe elements) that affect the generation of swirl flow and analyzes the effect of such parameters in mass transfer coefficient after the pipe elements. The results of this research can be utilized for taking account for the effect of swirl flow in the calculation of geometry factor to improve the accuracy of simulation codes.

Electrochemical study of liquid-solid mass transfer in packed bed electrodes with upward and downward co-current gas-liquid flow

1986 ◽  
Vol 16 (6) ◽  
pp. 947-963 ◽  
Author(s):  
A. Storck ◽  
M. A. Latifi ◽  
G. Barthole ◽  
A. Laurent ◽  
J. C. Charpentier
Keyword(s):  
Mass Transfer ◽  
Liquid Flow ◽  
Packed Bed ◽  
Electrochemical Study ◽  
Solid Mass ◽  
Gas Liquid Flow

Evaluation of Mass Transfer Coefficient Under Swirl Flow Generated by the Combination of Pipe Elements: Part 3 — Analysis of Geometry Factor Under Swirl Flow on Pipe Element

2014 ◽  
Author(s):  
Mikiya Matsushita ◽  
Kei Yamamoto ◽  
Takao Nakamura
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Pipe Wall ◽  
Swirl Flow ◽  
Estimation Methods ◽  
Piping System ◽  
Main Stream ◽  
Geometry Factor ◽  
Wall Thinning

Flow accelerated corrosion (FAC) is a major pipe wall thinning phenomena in power plant. The management of pipe wall thinning is carried out in pipe elements such as elbow, T-tube, orifice, etc. of piping system in power plants. Wall thinning estimation methods in the management is usually applied with pipe wall thickness measurement in Japan. In piping system, it is known that several pipe elements that are connected in series generate swirl flow. In Mihama Unit 3 pipe failure accident in 2004, it is pointed out the swirl flow caused by the piping layout might influence thinning rate behind orifice. Therefore the arrangement of pipe elements is considered to affect thinning phenomena seriously. So the behavior of swirl flow is one of the major research items to improve FAC model. The purpose of this paper is to study the influence of swirl flow on wall thinning phenomena generated by the combination of pipe elements. This study focuses on the conditions and parameters (combination, distance, curvature radius of elbow, etc. of pipe elements) that affect the generation of swirl flow and analyzes the effect of such parameters in mass transfer coefficient and flow field of main-stream of swirl flow behind pipe elements. It is expected that axial velocity of main-stream of swirl flow affects distribution of geometry factor under swirl flow on pipe element. The results of this study will be reflected to the evaluation of fluid-dynamic factor of FAC and can improve the management of wall thinning.

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