Hydrodynamic cavitation: from theory towards a new experimental approach

Lucia, Umberto; Gervino, G.

doi:10.2478/s11534-009-0092-y

Cited by 7 publications

(11 citation statements)

References 9 publications

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“…Recently, it has been highlighted that any effect in Nature is always the consequence of the dynamic balances of the interactions between the real systems and their environments [28][29][30][31][32][33][34][35][36][37][38][39]. Energy balances are the results of the exchange of energy, better exergy [41], between any real system and its environment [42][43][44][45].…”

Section: The Thermodynamic Fundamentalsmentioning

confidence: 99%

“…The entropy generation is a global quantity, so we can obtain global information on the cells, but from a biomedical point of view just the global cells behavior is the useful information. By taking into account these physical considerations [14,[28][29][30][31][32][33][34][35][36][37][38][39][43][44][45][46] a completely new approach to complex systems has been developed: the aim is to obtain an approach related to the spontaneous behaviour of the natural systems, based on the following considerations:…”

Section: From Engineering Open Systems To Cellsmentioning

confidence: 99%

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Bio-engineering thermodynamics: an engineering science for thermodynamics of biosystems

Lucia

2015

Int. J. Thermo

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Cells are open complex thermodynamic systems. Energy transformations, thermo-electro-chemical processes and transports occur across the cells membranes. Different thermo-electro-biochemical behaviours occur between health and disease states. Moreover, living systems waste heat, the result of the internal irreversibility. This heat is dissipated into the environment. But, this wasted heat represent a sort of information, which outflows from the cell toward its environment, completely accessible to any observer. Consequently, the analysis of irreversibility related to this wasted heat can represents a new approach to study the behaviour of the cells. So, this approach allows us to consider the living systems as black boxes and analyze only the inflows and outflows and their changes in relation to the modification of the environment. Therefore, information on the systems can be obtained by analyzing the changes in the cell heat wasted in relation to external perturbations. In this paper, a review of the recent results obtained by using this approach is proposed in order to highlight its thermodynamic fundamental: it could be the beginning of a new engineering science, the bioengineering thermodynamics. Some experimental evidences from literature are summarized and discussed. The approach proposed can allow us to explain them.

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Section: The Thermodynamic Fundamentalsmentioning

confidence: 99%

Section: From Engineering Open Systems To Cellsmentioning

confidence: 99%

Bio-engineering thermodynamics: an engineering science for thermodynamics of biosystems

Lucia

2015

Int. J. Thermo

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“…19 proposed local entropy generation to analyse the thermodynamic performance of a saturated two-phase flow. Lucia and Gervino 20 established a thermo-physical model to describe the cavitation and phase transition in flows; the said authors obtained reasonable results. The EGA method was introduced by Gong et al.…”

Section: Introductionmentioning

confidence: 97%

Entropy generation analysis for the cavitating head-drop characteristic of a centrifugal pump

Jiang

Zhu

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part C:

101

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Cavitation is a challenging flow abnormality that leads to undesirable effects on the hydraulic behaviour of centrifugal pumps. This study analyses the cavitating flow at a normal flow rate using the shear stress transport k-ω turbulence model and the Zwart cavitation model to capture the cavitation development and spatial distribution of vapour structures within the pump. A general description of the pump head-drop phenomenon was analysed through the study of local and global flow fields. The relationship between vapour distribution and entropy generation fields was mainly investigated through the local flow analysis method. Results show that the tendency of total entropy generation rate within the impeller coincides with the pump head-drop curve. The entropy generation rate changes slightly at the early stage of the cavitation development whereas rapidly increases when the cavitation has fully developed. Cavitation development enhances the hydraulic losses and flow unsteadiness in the impeller. These hydraulic losses are located substantially at the interface of the cavity, especially at the rear portion of the cavity region.

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“…should consists of two parts: the diffusion of kinetic energy [17] The two equations above are Eqs. (13) and (14).…”

Section: Discussionmentioning

confidence: 99%

Non-equilibrium Thermodynamic Extension of the Phenomenological Theories of First-order Phase Transitions

Aİ¹,

CAİ²

2014

International Journal of Thermodynamics

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Because the phenomenological theories of phase transitions which are based on the equilibrium thermodynamics cannot describe the first-order phase transition processes accurately, the non-equilibrium thermodynamics was applied to extending the existing phenomenological theories of first-order phase transitions. First, the internal interactions of system at a first-order phase transition were considered. The nominal stress, the nominal volume force, the internal electric field and the internal magnetic field were introduced to characterize them. Then, the most general Gibbs equation except the factor of chemical reactions was established. Based on the conservation of energy and the transformation between internal energy and kinetic energy, the rate of local entropy production was deduced. Then based on the principle of minimum entropy production and the generalized Onsager reciprocal relations, the local, evolving characteristics of a first-order phase transition (e.g. a first-order ferroelectric phase transition) were described well. It makes up the inadequateness of the older phenomenological theories.

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Hydrodynamic cavitation: from theory towards a new experimental approach

Cited by 7 publications

References 9 publications

Bio-engineering thermodynamics: an engineering science for thermodynamics of biosystems

Bio-engineering thermodynamics: an engineering science for thermodynamics of biosystems

Entropy generation analysis for the cavitating head-drop characteristic of a centrifugal pump

Non-equilibrium Thermodynamic Extension of the Phenomenological Theories of First-order Phase Transitions

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