An inspection of viscosity model for homogeneous two-phase flow pressure drop prediction in a horizontal circular micro-channel

Saisorn, Sira

doi:10.1016/j.icheatmasstransfer.2008.03.014

Cited by 22 publications

(18 citation statements)

References 13 publications

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“…Finally, the following model developed in Ref. 54 is used for the two-phase viscosity calculation, because it was shown to better match the experimental data 55 :…”

Section: Mathematical Model Developmentmentioning

confidence: 99%

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Computationally Efficient Pseudo-2D Non-Isothermal Modeling of Polymer Electrolyte Membrane Fuel Cells with Two-Phase Phenomena

Goshtasbi

Pence

Ersal

2016

J. Electrochem. Soc.

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In this article, a computationally efficient pseudo-2D model for real-time dynamic simulations of polymer electrolyte membrane fuel cells (PEMFCs) is developed with a specific focus on water and thermal management. The model accounts for temperature dynamics, two-phase flow and flooding in the diffusion media, and membrane water crossover as well as absorption and desorption processes. Computational efficiency is achieved by leveraging the disparate time scales within the system dynamics, in addition to exploiting the large aspect ratio of the cell layers to create a spatio-temporal decoupling. Taking advantage of such decoupling, the model yields a computationally efficient solution while providing detailed information about the state of water and temperature throughout the cell. Through this approach, the current implementation of the model is found to be about twice faster than real time. Moreover, a case study is carried out where different mechanisms contributing to overall water balance in the cell are investigated. The results are shown to be in qualitative agreement with published experimental data, thereby providing a preliminary validation of the modeling approach. Finally, using the modeling results, an equivalent electrical circuit model is proposed to help elucidate water transport inside various cell layers. Real-time estimation, prediction, and control of cell hydration and temperature distribution is essential for optimizing the performance of polymer electrolyte membrane fuel cells (PEMFCs), as well as avoiding critical conditions and mitigating cell degradation. These applications necessitate mathematical models that not only run in real time, but also incorporate the important physical phenomena related to water transport and thermal management. However, including such phenomena comes at the cost of higher computational requirements, resulting in a trade-off between model accuracy and computational speed, which must be carefully balanced based on the desired application. As a result of these competing requirements, developing mathematical models that achieve a balance between the needs for high fidelity and low computational demand remains an active area of research.Within the context of this paper, a fuel cell model is considered to have high fidelity if it incorporates the following phenomena: i) 3-D effects including anisotropic material properties 1-3 to resolve transport phenomena in all physical directions; ii) transient behavior; iii) detailed multistep hydrogen oxidation reaction (HOR) and oxygen reduction reaction (ORR) kinetics; 4,5 iv) multiphase flow in gas channels and porous media; v) non-isothermal effects; 6 and vi) multicomponent diffusion.7,8 A more detailed explanation of these considerations follows.In terms of dimensionality, 3-D models are of highest fidelity, because they are capable of capturing transport in both through-themembrane and along-the-channel directions and also account for the channel-land effects in the third dimension. Moreover, these models can easily in...

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“…Finally, the following model developed in Ref. 54 is used for the two-phase viscosity calculation, because it was shown to better match the experimental data 55 :…”

Section: Mathematical Model Developmentmentioning

confidence: 99%

“…In the activation overpotential term, i cross accounts for the crossover current due to hydrogen permeation through the membrane which is given by 92 : [55] To account for the voltage loss due to the catalyst coverage by liquid water, the cathodic exchange current density is determined by:…”

mentioning

confidence: 99%

Computationally Efficient Pseudo-2D Non-Isothermal Modeling of Polymer Electrolyte Membrane Fuel Cells with Two-Phase Phenomena

Goshtasbi

Pence

Ersal

2016

J. Electrochem. Soc.

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“…[3] performed the experimental study on vertically upward flow of the air-water in three small passages with the rectangular channel gap of 0.3, 0.6 and 1.0 mm under the heat insulation circumstance. Saisorn and Wongwises [4] performed the experimental study on such flow characteristics as flow pattern and pressure drop of air-steam liquid two-phase flow in a round tube with the inner diameter of 0.53 mm and length of 320 mm and observed the slug flow, throat-annular flow, stirring flow and annular-stream flow. In addition, Serizawa [5], Benjamin [6], De Vries [7], Wu and Gharib [8] studied the movement process of the bubbles in water through an indoor test, observed the movement characteristics of bubbles in liquid and analyzed the cause of different rising tracks of the bubbles, all of which mainly focus on study on the flow pattern and movement tracks, rather than the energy conversion test between air and liquid.…”

Section: Introductionmentioning

confidence: 99%

Study on test of Gas-liquid energy conversion efficiency

Sun¹,

Sun²,

Shao³

et al. 2016

Proceedings of the 2016 International Conference on Civil, Transportation and Environment

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Abstract. Development of hydraulic power energy with low water head is an effective supplementation for the traditional development of hydraulic power energy. How to effectively utilize the hydraulic power energy with low water head in nature is a problem now and the gas-liquid energy conversion efficiency is crucial to solve such problem. There are lots of parameters affecting the gas-liquid energy conversion efficiency, which mutually affect each other and whose relation is also very complicated. Therefore, it is necessary to determine their best configuration through the systematic test. This article describes the effects of three factors including diameter of the pump tube, diameter of intake tube, lift and intensity of pressure of air on the gas-liquid energy conversion efficiency and obtains their rules affecting the gas-liquid energy conversion efficiency through analyzing the test data and phenomena observed during test execution.

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“…Pfaff et al [6] have a study on bubble pump for a waterlithium bromide vapor absorption refrigerator, they found that reducing the diameter or height of lifting tube, increasing heating power, increasing the driving hydrostatic head all can make the oscillation cycle of the bubble pump shorten. And some scholars have done lots of research in two-phase flow patterns in vertical tube [9][10][11][12] . Liu et al [9] observed that the air-water two phase flow pattern in vertical tube was similar in different tubes.…”

Section: Introductionmentioning

confidence: 99%

Analysis on Flow Patterns of Two-phase Flow and Lifting Capacity in Two-stage Bubble Pump with Lithium Bromide Solution

Liu¹,

Gao²,

Meng³

2014

Proceedings of the 2014 International Conference on Mechatronics, Electronic, Industrial and Control Engineering

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An inspection of viscosity model for homogeneous two-phase flow pressure drop prediction in a horizontal circular micro-channel

Cited by 22 publications

References 13 publications

Computationally Efficient Pseudo-2D Non-Isothermal Modeling of Polymer Electrolyte Membrane Fuel Cells with Two-Phase Phenomena

Computationally Efficient Pseudo-2D Non-Isothermal Modeling of Polymer Electrolyte Membrane Fuel Cells with Two-Phase Phenomena

Study on test of Gas-liquid energy conversion efficiency

Analysis on Flow Patterns of Two-phase Flow and Lifting Capacity in Two-stage Bubble Pump with Lithium Bromide Solution

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