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Your search keyword '"Khan, Jamil"' showing total 36 results
Start Over Author "Khan, Jamil" Publisher american society of mechanical engineers
36 results on '"Khan, Jamil"'

2. Thermoelectric model of a tubular SOFC for dynamic simulation

Author

Jiang, Wei, Fang, Ruixian, Dougal, Roger A., and Khan, Jamil A.

Subjects
Thermoelectricity -- Research, Engineering and manufacturing industries, Petroleum, energy and mining industries, Science and technology
Abstract

A one-dimensional transient model of a tubular solid oxide fuel cell stack is proposed in this paper. The model developed in the virtual test bed (VTB) computational environment is capable of dynamic system simulation. This model is based on the electrochemical and thermal modeling, accounting for the voltage losses and temperature dynamics. The single cell is discretized using a finite volume method where all the governing equations are solved for each finite volume. The temperature, the current density, and the gas concentration distribution along the axial direction of the cell are presented. The dynamic behavior of electrical characteristics and temperature under the variable load is simulated and analyzed. For easy implementation in the VTB platform, the nonlinear governing equations are discretized in resistive companion form. The developed model is validated with experimental results and can be used for dynamic performance evaluation and design optimization of the cell under variable operating conditions and geometric condition. [DOI: 10.1115/1.2906114] Keywords: solid oxide fuel cell, SOFC, dynamic model simulation, virtual test bed

Published
2008

31. Suppression of Two-Phase Flow Instabilities in Parallel Microchannels by Using Synthetic Jets<.

Author

Ruixian Fang and Khan, Jamil A.

Subjects
*TWO-phase flow, *MICROCHANNEL flow, *JETS (Fluid dynamics), *PRESSURE, *TEMPERATURE effect, *HEAT sinks
Abstract

Two-phase flow instabilities in microchannels exhibit pressure and temperature fluctuations with different frequencies and amplitudes. An active way to suppress the dynamic instabilities in the boiling microchannels is to introduce synthetic jets into the channel fluid. Thus, the bubbles can be condensed before they clog the channel and expand upstream causing flow reversal. The present work experimentally investigated the effects of synthetic jets on microchannel flow boiling. An array of synthetic jets was introduced into the microchannel flow. The strength and frequency of the jets were controlled by changing the driving signals of the piezoelectric driven jet actuator. It is found that the bubbles were effectively condensed inside the jet cavity. The boiling flow reversals were notably delayed by the synthetic jets. Meanwhile, the pressure fluctuation amplitudes were suppressed to some extent. It was also observed that synthetic jets can help to uniformize the heat sink temperature distribution. [ABSTRACT FROM AUTHOR]

Published
2013
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36. Thermoelectric Model of a Tubular SOFC for Dynamic Simulation.

Author

Wei Jiang, Ruixian Fang, Dougal, Roger A., and Khan, Jamil A.

Subjects
*SOLID oxide fuel cells, *DYNAMICS, *ELECTROCHEMICAL analysis, *SIMULATION methods & models, *THERMAL analysis, *FINITE volume method, *TEMPERATURE, *DENSITY, *MATHEMATICAL optimization
Abstract

A one-dimensional transient model of a tubular solid oxide fuel cell stack is proposed in this paper. The model developed in the virtual test bed (vm) computational environment is capable of dynamic system simulation. This model is based on the electrochemical and thermal modeling, accounting for the voltage losses and temperature dynamics. The single cell is discretized using a finite volume method where all the governing equations are solved for each finite volume. The temperature, the current density, and the gas concentration distribution along the axial direction of. the cell are presented. The dynamic behavior of electrical characteristics and temperature under the variable load is simulated and analyzed. For easy implementation in the VTB platform, the nonlinear governing equations are discretized in resistive companion form. The developed model is validated with experimental results and can be used for dynamic performance evaluation and design optimization of the cell under variable operating conditions and geometric condition. [ABSTRACT FROM AUTHOR]

Published
2008
Full Text
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