NDLI: Flow Regime Evolution in Long, Serpentine Microchannels With a Porous Carbon Paper Wall

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Julie, E. Steinbrenner Lee, Eon Soo Wang, Fu-Min Fang, Chen Carlos, H. Hidrovo Kenneth, E. Goodson
Copyright Year	2008
Abstract	An important function of the gas delivery channels in Proton Exchange Membrane (PEM) fuel cells is the evacuation of liquid water created at the cathode. The resulting two-phase flow can become an obstacle to reactant transport and a source of parasitic losses. The present work examines the behavior of two-phase flow in 500 μm × 500 μm × 60 cm channels with distributed water injection through a porous carbon paper wall to gain understanding of the physics of flows relevant to fuel cell water management challenges. Flow regime maps based on local gas and liquid flow rates are constructed for experimental conditions corresponding to current densities between 0.5 and 1 A/cm2 and stoichiometric coefficients from 1 to 4. Flow structures are analyzed along the entire length of the channel. It is observed that slug flow is favored to plug flow at high air flow rates and low liquid flow rates. Stratified flow dominates at high liquid flow rates. Along the axial flow direction, the flow regime consistently transitions from intermittent to wavy to stable stratified flow. This progression is quantified using a parameter of flow progression which characterizes the degree of development of the two-phase flow toward the stable stratified condition. This parameter is discussed in relation to fuel cell operating conditions. It provides a metric for analyzing liquid water removal mechanisms in the cathode channels of PEM fuel cells.
Starting Page	773
Ending Page	781
Page Count	9
File Format	PDF
ISBN	9780791848715
DOI	10.1115/IMECE2008-68447
e-ISBN	9780791838402
Volume Number	Volume 10: Heat Transfer, Fluid Flows, and Thermal Systems, Parts A, B, and C
Conference Proceedings	ASME 2008 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2008-10-31
Publisher Place	Boston, Massachusetts, USA
Access Restriction	Subscribed
Subject Keyword	Water Water resource management Carbon Flow (dynamics) Physics Microchannels Proton exchange membranes Air flow Evacuations Two-phase flow Slug flows Fuel cells Underground injection Proton exchange membrane fuel cells Axial flow Stratified flow
Content Type	Text
Resource Type	Article

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