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3rd Thermal and Fluids Engineering Conference (TFEC)

ISSN: 2379-1748

ENTROPY GENERATION MINIMIZATION FOR ONE-WAY ISOTHERMAL MASS TRANSFER PROCESSES WITH MASS LEAKAGE

Shaojun Xia
Institute of Thermal Science and Power Engineering, Naval University of Engineering, Wuhan 430033, P. R. China; Military Key Laboratory for Naval Ship Power Engineering, Naval University of Engineering, Wuhan 430033, P. R. China; College of Power Engineering, Naval University of Engineering, Wuhan 430033, P. R. China

Lingen Chen
Institute of Thermal Science and Power Engineering, Naval University of Engineering, Wuhan 430033, China; Military Key Laboratory for Naval Ship Power Engineering, Naval University of Engineering, Wuhan 430033, China; College of Power Engineering, Naval University of Engineering, Wuhan 430033, China

Huijun Feng
Institute of Thermal Science and Power Engineering, Naval University of Engineering, Wuhan 430033, P. R. China; Military Key Laboratory for Naval Ship Power Engineering, Naval University of Engineering, Wuhan 430033, P. R. China; College of Power Engineering, Naval University of Engineering, Wuhan 430033, P. R. China

DOI: 10.1615/TFEC2018.tfh.020744
pages 1249-1259


KEY WORDS: diffusive mass transfer law, one-way isothermal mass transfer, mass leakage, entropy generation, averaged optimal control theory, finite time thermodynamics

Abstract

A model of a one-way isothermal mass transfer process with mass leakage is established in this paper. The mass transfer process is assumed to obey Fick's diffusive mass transfer law. Under the condition of the given amount of mass transferred of the key component in the mixture at the lowconcentration side, the optimality condition for the minimum entropy generation of the process is obtained by using averaged optimal control theory. Numerical examples are provided, and effects of both the mass leakage and the amount of mass transferred on the optimization results are analyzed. The optimal strategy is also compared with two mass transfer strategies of constant concentration ratio and constant concentration difference operation. The results obtained in this paper can provide some theoretical guidelines for optimal design and operation of practical mass transfer processes and devices.

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