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152 results on '"Passaretti, Francesca"'

41. Study of a Torque Limiter Based on NiTi Pseudoelastic Tapes.

Author

Nespoli, Adelaide, Bassani, Enrico, Villa, Elena, and Passaretti, Francesca

Subjects
NICKEL-titanium alloys, SHAPE memory alloys, TORQUE
Abstract

Herein, a new torsional device based on shape memory alloy elements and operating as torque limiter is presented. It consists of a set of pseudoelastic NiTi tapes working in series configuration. The tapes are assembled radially with respect to the rotational direction and work sequentially in beam‐like bending mode. The trend of the resulting torque may span from pulsating to continuous by changing the number of tapes. Furthermore, the use of NiTi material enables a temperature‐dependent response. Due to the particular mounting, the flag‐shaped pseudoelastic mechanical behavior typical of NiTi is partially hidden; however, the use of pseudoelastic elements provides a stable cyclic response and enables the possibility to tune the output torque. [ABSTRACT FROM AUTHOR]

Published
2022
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42. Tailoring thermomechanical treatment of Ni-Fe-Ga melt-spun ribbons for elastocaloric applications

Author

Electricidad y electrónica, Elektrizitatea eta elektronika, Villa, Elena, Aguilar Ortiz, Christian Omar, Nespoli, Adelaide, Álvarez Alonso, Pablo, Camarillo García, Juan Pablo, Salazar Jaramillo, Daniel, Passaretti, Francesca, Flores Zuñiga, Horacio, Hosoda, H., Chernenko, Volodymyr, Electricidad y electrónica, Elektrizitatea eta elektronika, Villa, Elena, Aguilar Ortiz, Christian Omar, Nespoli, Adelaide, Álvarez Alonso, Pablo, Camarillo García, Juan Pablo, Salazar Jaramillo, Daniel, Passaretti, Francesca, Flores Zuñiga, Horacio, Hosoda, H., and Chernenko, Volodymyr

Abstract

In the present work, the structural, mechanical and shape memory properties of Ni55Fe16Ga29 (at.%) melt-spun ribbons have been studied with a prospective of application in the elastocaloric devises. Particularly, a special thermo-mechanical treatment, consisting in the thermal aging under constant external stress, was elaborated to control the residual internal stress generated due to the melt-spinning processing and improve thermomechanical and superelastic responses of the ribbon. The stress-induced entropy change was evaluated for the ribbon with improved thermomechanical properties. (C) 2019 The Authors. Published by Elsevier B.V.

Published
2019

46. Study of a catalytic meso-scale combustor coupled with thermoelectrical devices for portable energy production

Author

Fanciulli Carlo, Merotto Laura, Passaretti Francesca, and De Iuliis Silvana

Subjects
Catalytic combustor, Thermoelectric generator
Abstract

The advances in miniaturized mechanical devices open exciting new opportunities for com- bustion, especially in the field of micro power generation, allowing the development of power-supply devices with high specific energy (small size, low weight, long duration). Even at 10% energy conversion efficiency hydrocarbon fuels can provide 10 times the energy den- sity of the most advanced batteries. Therefore, the growing interest in miniaturized devices is further boosted by the desire to replace batteries with hydrocarbon-based fuels for port- able power sources. In this context, both homogeneous combustion and catalytic reactors are of major interest. The development of a device based on catalytic combustor coupled with thermoelectric modules is particularly attracting for combustion stability and safety. Furthermore, when implemented in micro-meso scale devices, catalytic combustion allows fully utilization of the high energy densities of hydrocarbon fuels, but at notably lower operating temperatures than those typical of traditional combustion. These conditions are more suitable for coupling with conventional thermoelectric modules, preventing their degradation. In this work a novel catalytic meso-scale combustor fuelled with propane/air mixture has been coupled with two conventional thermoelectric modules. The wafer-like combustor is filled up with commercially-available catalytic pellets of alumina with Platinum (1% weight). In order to calibrate the operating conditions, the analysis of the temperature values and distribution across the combustor surfaces have been carried out. Characterization of exhaust gases concentration and of pellet aging were performed in order to investigate combustor properties. The results of the combustor behavior characterization guided the coupling of the combustor with commercially available thermoelectric modules using at the cold side a water cooled heat exchanger. The system obtained has been charac- terized in different operating conditions measuring the delivered electric power in different operating conditions. Efficiency estimation proves that the system is suitable for small port- able power generation.

Published
2015

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