Measurement of mass diffusivity by light streak imaging

Nimdeo, Yogesh M.; Joshi, Yogesh M.; Muralidhar, K.

doi:10.1016/j.cherd.2015.06.023

Cited by 7 publications

(1 citation statement)

References 20 publications

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“…Therefore, the assumption about the position of the gas−liquid interface given by eq 8 becomes invalid for the finite acting reservoirs. The expression for the position can be modeled by the exponential function 42 to account for these volume restrictions for the finite acting reservoirs.…”

Section: Model Formulation and Analysismentioning

confidence: 99%

Sequential Slope and Intercept Method for Estimation of Gas Absorption and Diffusion Coefficients in Binary Gas–Liquid Systems

Babak

Kantzas

2019

Energy Fuels

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A novel geometric method based on a sequential slope−intercept approach is derived for estimation of concentration-dependent diffusion, gas absorption, and gas dissolution concentration in gas−liquid binary systems. The gas absorption and diffusion are modeled using an inverse free boundary problem governed by Fick's second law of diffusion and Henry's absorption law. An unknown gas−liquid interface is governed by the Stefan's type boundary condition. Implementation of the estimation method involves piecewise linear approximation of the transformed concentration data and sequential application of the estimated slopes and intercepts from this approximation. Application and validation of the developed estimation method is given for synthetic concentration profiles and for real concentration measurements for a dimethyl ether− bitumen binary system obtained using computer tomography. The developed estimation method overcomes the existing estimation methods derived from polynomial approximations that significantly underestimate or overestimate the diffusion coefficients at very low dissolved gas concentrations.

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Section: Model Formulation and Analysismentioning

confidence: 99%