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首页> 外文期刊>Hadronic journal >NEGENTROPIC THERMODYNAMICS Ⅱ: AN AUTOPOIETIC, HEAT-ENGINE-CENTERED MODEL FOR RAYLEIGH-BENARD CONVECTION
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NEGENTROPIC THERMODYNAMICS Ⅱ: AN AUTOPOIETIC, HEAT-ENGINE-CENTERED MODEL FOR RAYLEIGH-BENARD CONVECTION

机译：NEGENTROPIC THERMODYNAMICS Ⅱ: AN AUTOPOIETIC, HEAT-ENGINE-CENTERED MODEL FOR RAYLEIGH-BENARD CONVECTION

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摘要

A thermodynamic model for the emergence and permanence of the convective structure in Rayleigh-Benard convection (RBC) is here presented having an autopoietic concatenation of optimally-efficient heat engines as its central component. The model makes use of the proof advanced in Part I of this two-part series about the negative total-entropy change associated to the energy-upgrading process represented by the transformation of heat into work. This notion, under the assumption of the convective structure being the manifestation of the work output of the said concatenation of optimally efficient engines, allows for the development of an expression for its negative entropy change. This way the total-entropy equation for RBC ends up being composed of two oppositely-signed entropy terms: a positive one originating in the irreversible heat flow, and a negative one from the architectural and functional order of the convective structure. Along the path of increasing temperature gradients to which the fluid in RBC is subjected to, a temperature gradient is reached at which the fluid organizes itself in the form of cells or parallel rolls. This chaos-order transition is identified by our model as the point at which the entropic contribution to the total-entropy change is precisely balanced or neutralized by negentropy of the structure, producing as a consequence the transition from an entropic to a nonentropic universe. The nonentropic universe remains as long as structure-mediated-convection remains the only heat transfer mechanism. The span of life of the convective structure is this way represented by the interval of gradients defining the nonentropic path. These notions are put to the test by means of the experimental data of Schmidt and Saunders, and Schmidt and Milverton. The results obtained agree with our conceptualization

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