Elastocaloric effect of Ni-Ti wire for application in a cooling device
By J. Tušek, Kurt Engelbrecht, Lars Pilgaard Mikkelsen, N. Pryds. 2015
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We report on the elastocaloric effect of a superelastic Ni-Ti wire to be used in a cooling device. Initially, each evaluated wire was subjected to 400 loading/unloading training cycles in order to stabilize its superelastic behavior. The wires were trained at different temperatures, which lead to different stabilized superelastic behaviors. The stabilized (trained) wires were further tested isothermally (at low strain-rate) and adiabatically (at high strain-rate) at different temperatures (from 312 K to 342 K). We studied the impact of the training temperature and resulting superelastic behavior on the adiabatic temperature changes. The largest measured adiabatic temperature change during loading was 25 K with a corresponding 21 K change during unloading (at 322 K). A special focus was put on the irreversibilities in the adiabatic temperature changes between loading and unloading. It was shown that there are two sources of the temperature irreversibilities: the hysteresis (and related entropy generation) ...
Subfields: Biomaterials, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/510f1fb34b0e547cc35e695d9be37250a0e59e4a
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In Materials Chemistry
Citations in the corpus
- Elastocaloric cooling capacity of shape memory alloys – Role of deformation temperatures, mechanical cycling, stress hysteresis and inhomogeneity of transformation (2017, background): “[5,55], where the integral corresponds to the”
- Elastocaloric effect vs fatigue life: Exploring the durability limits of Ni-Ti plates under pre-strain conditions for elastocaloric cooling (2018, unknown): “It must be noted that the larger the hysteresis, the larger the temperature irreversibilities [7].”