scholarly journals Nonlinear Oxygen Transport with Poiseuille Hemodynamic Flow in a Micro-Channel

2020 ◽  
Author(s):  
Terry E. Moschandreou ◽  
Keith C. Afas
Keyword(s):  
Oxygen Transport ◽  
Micro Channel ◽  
Hemodynamic Flow

The Cross Flow Mechanism in the Micro Channel of a Polymer Electrolyte Fuel Cell

2013 ◽  
Author(s):  
K. M. Salahuddin ◽  
Nobuyuki Oshima ◽  
Litan Kumar Saha
Keyword(s):  
Fuel Cell ◽  
Flow Rate ◽  
Oxygen Transport ◽  
Gas Flow ◽  
Flow Behavior ◽  
Cross Flow ◽  
Polymer Electrolyte Fuel Cell ◽  
Micro Channel ◽  
Flow Through ◽  
The Cross

In this article we presented the recent activities in the field of gas flow in the micro channel and porous media of a polymer electrolyte fuel cell (PEFC). The gas flow behavior in the micro-channel, especially in the case of serpentine channel is very complex due to the appearance of cross flow through the gas diffusion layer (GDL). The gas flow behavior in the separator channel and GDL of a PEFC has been studied by using a transient, isothermal and three dimensional numerical models. To predict gas flow phenomena accurately the precise calculation of mass conversation is necessary which is strictly maintained in our present simulation. The effects of physical characteristics and geometrical properties have been investigated to quantify the amount of cross flow and pressure loss. The cross flow has been investigated in terms of volume mass flux through the GDL under the rib. The ratio cross flow rate to the total flow rate increases when gas channel pitch length decreased. Moreover, with increasing of permeability this ratio also increases. The effect of cross flow and bend region characteristics on the pressure loss has been identified. In addition, to isolate the contribution of cross flow on the performance of fuel cell, the simulation was carried out with electrochemical reaction using parallel straight channel. We designed a parallel flow field to induce artificial cross flow through the GDL. The numerical results show that the flow cross-over through the GDL under the rib significantly facilitate the oxygen transport towards the catalyst layer. Therefore, it is possible to overcome the oxygen transport limitation. Consequently, the cross flow can increase the current density by reducing the oxygen transport limitation, although this also increases the non-uniformity in current density.

Detection for Particles Moving in Micro Channel with Multifiber Array Sensor

2012 ◽  
Vol 132 (7) ◽  
pp. 203-211 ◽  
Author(s):  
Ichiro Okuda ◽  
Tomohito Takubo ◽  
Yasushi Mae ◽  
Kenichi Ohara ◽  
Fumihito Arai ◽  
...  
Keyword(s):  
Micro Channel ◽  
Array Sensor

Development of Monolithic Si Micro Channel Plate

2009 ◽  
Vol 129 (12) ◽  
pp. 461-468
Author(s):  
Keishi Sakuma ◽  
Kohro Takahashi
Keyword(s):  
Micro Channel ◽  
Channel Plate ◽  
Micro Channel Plate

Numerical Resolution of Conjugate Heat Transfer Problem in a Parallel-Plate Micro-Channel

2010 ◽  
Vol 41 (3) ◽  
pp. 247-263 ◽  
Author(s):  
Yassine Kabar ◽  
Mourad Rebay ◽  
Mahfoud Kadja ◽  
Colette Padet
Keyword(s):  
Heat Transfer ◽  
Parallel Plate ◽  
Conjugate Heat Transfer ◽  
Transfer Problem ◽  
Heat Transfer Problem ◽  
Micro Channel ◽  
Numerical Resolution
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