VALERIU V. JINESCU, STOIAN PETRESCU, COSMIN JINESCU<br>Energy, Work, Heat and Efficiency in Processes with Gases, <br>Viscous and Viscoelastic Liquids and Solids<br>II. Energy, work, heat and efficiency in viscous <br>and viscoelastic liquids and in solids

VALERIU V. JINESCU, STOIAN PETRESCU, COSMIN JINESCU
Energy, Work, Heat and Efficiency in Processes with Gases,
Viscous and Viscoelastic Liquids and Solids
II. Energy, work, heat and efficiency in viscous
and viscoelastic liquids and in solids

Abstract:

We present a unitary thermodynamic approach in the treatment of deformation and flow processes in: viscous and elastic liquids and in solids. The formulae for work and heat interactions (exchanged in these processes) are deduced, and a comparison between them is made, in order to illustrate the similarities and differences (particularities): - for purely viscous liquids (with linear and nonlinear behaviour); - for viscoelastic liquids in flowing; - for solids (with linear and nonlinear behaviour), in the case of using engineering concepts or natural concepts (for mechanical stress and strain). Electrical conductors (made from solid materials) are studied also from the point of view of work and heat interactions. The influence of the concepts used in the cases of matter deformation or fluid flow on the formulae of work and heat is studied. The need to express correlations between causes (stress) and effects (strain, shear strain or strain rate), depending on the way the effects have been determined (calculations or measurements) is emphasized. The numerical examples show how the results obtained in the paper may be practically used. Keywords: energy; work and heat; electromagnetic processes; viscous liquids; viscoelastic liquids; solids; matter behaviour; efficiency

Issue: 2013, Volume 64, Issue 6

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