نتایج جستجو برای: transient natural gas flow

تعداد نتایج: 1262719  

2007
Serhat Yesilyurt

Transients have utmost importance in the lifetime and performance degradation of PEM fuel cells. Recent studies show that cyclic transients can induce hygro-thermal fatigue. In particular, the amount of water in the membrane varies significantly during transients, and determines the ionic conductivity and the structural properties of the membrane. In this work, we present three-dimensional time...

2008
Keith Promislow Paul Chang Herwig Haas Brian Wetton

A model is presented of a polymer electrolyte fuel cell including slow transient effects of liquid water accumulation and evaporation in gas diffusion electrodes GDEs and gas channels. The model is reduced dimensionally, coupling a one-dimensional 1D model of gas and coolant channel flow to 1D models of transport through the membrane electrode assembly MEA and bipolar plates. An asymptotic redu...

Journal: :CoRR 2014
Michael Chertkov Vladimir Lebedev Scott Backhaus

The revolution of hydraulic fracturing [1] has dramatically increased the supply and lowered the cost of natural gas in the United States driving an expansion of natural gas-fired generation capacity in many electrical grids [2]. Unrelated to the natural gas expansion, lower capital costs [3] and renewable portfolio [4] standards are driving an expansion of intermittent renewable generation cap...

2009
Philip T. Metzger Robert C. Latta Jason M. Schuler

When a jet of gas impinges vertically on a granular bed and forms a crater, the grains may be moved by several different mechanisms: viscous erosion, diffused gas eruption, bearing capacity failure, and/or diffusion-driven shearing. The relative importance of these mechanisms depends upon the flow regime of the gas, the mechanical state of the granular material, and other physical parameters. H...

Journal: :Emission control science and technology 2022

Abstract To precisely control a vehicle powertrain to minimize emissions, accurate and detailed models are needed capture the spatio-temporal variability of variables interest. The aim this work is analyze flow temperature fields in geometrically realistic — thus complex exhaust gas aftertreatment system under transient conditions. response these upstream step changes predicted using three-dime...

Journal: :TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B 1984

2009
S. Sillanpää M. Heinonen

In a dynamic weighing gas mass flow measurement, the gas mass flow rate is continuously determined by weighing a gas mass loss from a gas cylinder as a function of time. In this measurement method, the temperature difference between the wall of the gas cylinder and ambient air cannot be avoided. Due to natural convection flow, a shear stress appears on the wall of the cylinder. Because of the d...

Lattice gas automata (LGA) model is developed to simulate polymer adsorption process by adding some collision rules. The simulation result of the model is matched with batch experiment and compared with accepted isothermal adsorption equations. They show that the model is viable to perform simulation of the polymer adsorption process. The LGA model is then applied for simulating continuous poly...

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