Showing papers by "Sreenivas Jayanti published in 2007"
TL;DR: In this paper, a sensitivity analysis is performed using the CFD code CFX of AEA Technology, on the likely effect of ash content on the char reactivity, oxygen diffusion rate for char combustion and on the radiative heat transfer parameters.
56 citations
22 citations
TL;DR: In this article, measurements of two-phase flow pressure drop have been made during a phase-change heat transfer process with refrigerant (R-134a) as a working fluid for a wide range of pressures right up to the critical pressure.
14 citations
TL;DR: In this paper, a simplified water balance model was developed to predict when incipient flooding/dehydration may take place in a fuel cell, which is based on multicomponent diffusion in the electrodes and molar balance in the flow channels.
Abstract: Proper water management is critical for near-ambient temperature operation of a fuel cell. A simplified water balance model has been developed to predict when incipient flooding/dehydration may take place. The present model is based on multicomponent diffusion in the electrodes and molar balance in the flow channels. The overall model is in the form of a closed-form expression for the critical or threshold or balance current density at which the water production rate and the water vapor evacuation rate are exactly balanced. The model incorporates the influence of the operating conditions, properties of electrodes, and flow and geometric parameters in the gas channels on the balance current density. Predictions from the model of the state-incipient flooding or dehydration-of operation of the fuel cell agree well with the available experimental data. Using the model, a parametric study has been conducted over a range of parameters.
2 citations