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• W2019885148 abstract "Abstract The mechanistic model DeProF considers steady-state two-phase flow in porous media as a composition of three flow patterns: connected-oil pathway, ganglion dynamics and drop traffic flow. Their key difference is the degree of disconnection of the non-wetting phase which affects the relative magnitude of the rate of energy dissipation caused by capillary effects compared to that caused by viscous stresses. An appropriate mesoscopic scale analysis defines the process independent variables to be the capillary number, Ca, and the oil-water flowrate ratio, r, and leads to the determination of all the internal flow arrangements that are compatible with the externally imposed flow conditions. The observed macroscopic flow is an average over the canonical ensemble of the internal flow arrangements at mesoscopic scale. Extensive simulations using the DeProF algorithm revealed that there exist a continuous line, r*(Ca), in the domain of the process operational variables, (Ca, r) on which the efficiency of the process (oil produced per kW dissipated in pumps) attains a local maximum. The locus r*(Ca) defines the process optimum operating conditions. These findings are consistent with the phenomenology already presented in many experimental works. The scope of the present work is to introduce a rational justification of the existence of the locally optimum operating conditions predicted by the DeProF theory. Steady-state two-phase flow in porous media is a stationary process maintained in dynamic equilibrium on the expense of energy supplied to the system (an off-equilibrium process). The efficiency of the process depends on its spontaneity, measurable by the rate of global entropy production. The latter is the sum of two components: the rate of mechanical energy dissipation at constant temperature and a conformational entropy production component, directly related to the number of internal flow arrangements. The DeProF algorithm simulations indicate that: for every oil-water-pore network system, optimum operating conditions exist for the r*(Ca) values for which the rate of global entropy production becomes maximum, i.e. when the process is as spontaneous as physically possible. The conceptual statement introduced here is an initial approach towards implementing aspects of statistical thermodynamics to elucidate further the underlying physics of the process." @default.
• W2019885148 created "2016-06-24" @default.
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• W2019885148 date "2010-09-19" @default.
• W2019885148 modified "2023-09-23" @default.
• W2019885148 title "Optimum Operating Conditions for Steady-State Two-Phase Flow in Pore Networks: Conceptual Justification Based on Statistical Thermodynamics" @default.
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• W2019885148 doi "https://doi.org/10.2118/135429-ms" @default.
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