Magnetic systems depending on three or two variables; thermodynamic analysis and some existing and possible applications

Bisio, G.; Rubatto, G.; Schiapparelli, P.

doi:10.1016/s0196-8904(99)00016-3

Cited by 21 publications

(8 citation statements)

References 18 publications

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“…Cryogenic industrial application of FFs are not known yet, but have already been thought of . Normally commercial products have a pour point ranging from 180 to 250 K. Magnetic properties of the constituent NPs are kept well below the blocking temperature, generally in the range between 5 and 25 K, meaning that it could be possible to create a cryoferrofluid (CFF) using particular solvents.…”

Section: Methodsmentioning

confidence: 99%

Smart Fluid Systems: The Advent of Autonomous Liquid Robotics

Chiolerio

Quadrelli

2017

Advanced Science

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Organic, inorganic or hybrid devices in the liquid state, kept in a fixed volume by surface tension or by a confining membrane that protects them from a harsh environment, could be used as biologically inspired autonomous robotic systems with unique capabilities. They could change shape according to a specific exogenous command or by means of a fully integrated adaptive system, and provide an innovative solution for many future applications, such as space exploration in extreme or otherwise challenging environments, post‐disaster search and rescue in ground applications, compliant wearable devices, and even in the medical field for in vivo applications. This perspective provides an initial assessment of existing capabilities that could be leveraged to pursue the topic of “Smart Fluid Systems” or “Liquid Engineered Systems”.

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Section: Methodsmentioning

confidence: 99%

Smart Fluid Systems: The Advent of Autonomous Liquid Robotics

Chiolerio

Quadrelli

2017

Advanced Science

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“…Since 1990 there have been a large number of publications related to the basics of magnetocaloric thermodynamics [29][30][31][32][33][34][35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

The Thermodynamics of Magnetocaloric Energy Conversion

Kitanovski

Tušek

Tomc

et al. 2014

Magnetocaloric Energy Conversion

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Magnetocaloric energy conversion is a technology based on the exploitation of the magnetocaloric effect (MCE). The MCE is a physical phenomenon that occurs in magnetic materials under the influence of a varying magnetic field. Is it usually expressed as the adiabatic temperature change or isothermal total entropy change of a material. In a ferromagnetic material the entropy can be, for instance, related to the magnetic part and the part related to the temperature of the system (e.g. the lattice entropy). In the absence of a magnetic field, the magnetic moments in the material are disordered. If a magnetic field is applied to the material, the magnetic moments will be forced to align in a higher order. As a consequence, the magnetic entropy will decrease. In isentropic (adiabatic) conditions, the total entropy will remain constant. Therefore, the decreased magnetic entropy will manifest itself in an increased lattice entropy. The atoms in the material will start to vibrate more intensively, and as the consequence, the temperature of the magnetic material will increase. The opposite occurs when the magnetic field is removed: the magnetic entropy is increased and the temperature decreases. On this basis, it is possible to create energy conversion cycles by applying different thermodynamic processes.In this chapter, the basic magnetocaloric thermodynamic potentials are presented and described. The state of the art gives an overview of the existing theoretical and experimental approaches to magnetocaloric thermodynamic cycles. Different magnetic thermodynamic cycles are described. Besides thermodynamic cycles with conventional simple cycles, an important emphasis is placed on thermodynamic cycles that apply active magnetic regeneration (AMR). Since most of the existing devices apply the AMR principle, a whole chapter (Chap. 4) is dedicated to this topic.

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“…and Guglielmini, 1993;Bisio et al, 1999), a symbolism somewhat different from the classical one is used for partial derivatives. For example, the symbol (8 2 STp) indicates the partial derivative of S (function of T, p) with respect to p and the symbol (8 1 STp) indicates the partial derivative of s with respect to T.…”

Section: Introductionmentioning

confidence: 99%

Remarks on Thermodynamic Diagrams With Specific Considerations for “ Invariant” Properties

Bisio

Martini

2000

Chemical Engineering Communications

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When the aim is a qualitative examination of thermodynamic phenomena and processes of two independent variable systems, the various state diagrams (p vs. v; T vs. s; i vs. s; P vs. i, ere.) are very useful. Every one of these diagrams is suitable to put in evidence some topics, whereas other ones can not be displayed. That is unavoidable since all topics can be displayed only by means of a three-dimension representation.The several diagrams, even if very different among them, have some common properties. The main aim of this paper is that of examining one property which seems interesting for the analysis of such diagrams: the order, according to which the different processes (isobaric, isothermal, isentropic, isenthalpic, isochoric) depart from a given point, is invariable, even if this order is different in the various zones of the diagrams. In addition, other properties of some diagrams are considered.

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Magnetic systems depending on three or two variables; thermodynamic analysis and some existing and possible applications

Cited by 21 publications

References 18 publications

Smart Fluid Systems: The Advent of Autonomous Liquid Robotics

Smart Fluid Systems: The Advent of Autonomous Liquid Robotics

The Thermodynamics of Magnetocaloric Energy Conversion

Remarks on Thermodynamic Diagrams With Specific Considerations for “ Invariant” Properties

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