Principal Curves for Lumen Center Extraction and Flow Channel Width Estimation in 3-D Arterial Networks: Theory, Algorithm, and Validation

A double-bridge shape is proposed as a novel flow channel cross-sectional shape of a membraneless microfluidic fuel cell, and its electrochemical performance was analyzed with a numerical model. A membraneless microfluidic fuel cell (MMFC) is a micro/nano-scale fuel cell with better economic and commercial viability with the elimination of the polymer electrolyte membrane. The numerical model involves the Navier–Stokes, Butler–Volmer, and mass transport equations. The results from the numerical model were validated with the experimental results for a single-bridge channel. The proposed MMFC with double-bridge flow channel shape performed better in comparison to the single-bridge channel shape. A parametric study for the double-bridge channel was performed using three sub-channel widths with the fixed total channel width and the bridge height. The performance of the MMFC varied most significantly with the variation in the width of the inner channel among the sub-channel widths, and the power density increased with this channel width because of the reduced width of the mixing layer in the inner channel. The bridge height significantly affected the performance, and at a bridge height at 90% of the channel height, a higher peak power density of 171%was achieved compared to the reference channel.

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Tsunami-like flow induced forces on the structure: Dependence of the hydrodynamic force coefficients on Froude number and flow channel width in quasi-steady flow phase

Coastal Engineering ◽

10.1016/j.coastaleng.2021.104078 ◽

2021 ◽

pp. 104078

Author(s):

S. Harish ◽

V. Sriram ◽

Holger Schüttrumpf ◽

S.A. Sannasiraj

Keyword(s):

Froude Number ◽

Steady Flow ◽

Hydrodynamic Force ◽

Flow Channel ◽

Channel Width ◽

Structure Dependence ◽

Force Coefficients ◽

Flow Phase

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Numerical Studies on PEM Fuel Cell with Different Landing to Channel Width of Flow Channel

Procedia Engineering ◽

10.1016/j.proeng.2014.12.437 ◽

2014 ◽

Vol 97 ◽

pp. 1534-1542 ◽

Cited By ~ 14

Author(s):

M. Muthukumar ◽

P. Karthikeyan ◽

M. Vairavel ◽

C. Loganathan ◽

S. Praveenkumar ◽

...

Keyword(s):

Fuel Cell ◽

Pem Fuel Cell ◽

Flow Channel ◽

Channel Width ◽

Numerical Studies

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Flow Mixing of Double Two-Inlet Y-Type Micro Channel with Optimal Layout of Obstacles

Journal of Mechanics ◽

10.1017/jmech.2011.22 ◽

2011 ◽

Vol 27 (2) ◽

pp. N1-N4 ◽

Cited By ~ 4

Author(s):

C.-T. Wang ◽

Y.-M. Chen

Keyword(s):

Reynolds Number ◽

Flow Channel ◽

Channel Width ◽

Mixing Efficiency ◽

Micro Channel ◽

Optimal Layout ◽

Flow Mixing ◽

Lower Reynolds Number

ABSTRACTIn this study a double two-inlet Y-type microchannel with two up-down symmetrical obstacles was applied. This was done because the positions of the obstacles in the flow channel, arranged in an up- down symmetrical fashion, could provide a higher mixing efficiency. As for the optimal layout of obstacles inthe microchannel, the positions of the two up-down symmetrical obstacles were set as the location of obstacle A/D = 0.198, the length of obstacle K/D = 0.453, the horizontal spacing between the two obstacles T/D = 0, and the flow channel width between the two obstacles Y/D = 0.080, This was because it could generate theflow mixing efficiency with 0.984 and at a lower Reynolds number, Re 4.7. These observations willcontribute to the improvement of a Y-type micromixer design.

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