Abstract
There is an urgent need to develop an alternative high-efficiency cooling technology that is affordable and environmentally friendly. Elastocaloric effect has attracted particular attention due to large available latent heat and large adiabatic temperature changes. The primary objective of this study is to control the deformation of NiTi solid-state cooling refrigerator simples rapidly and accurately. In the present study, coil specimens made of a pseudoelastic Ni50.8–Ti49.2 (at%) NiTi wires are utilized and elastocaloric effect behavior were studied by evaluating the temperature profiles and the tensile force characteristics during uncoiling-coiling cycle tests conducted at ambient conditions. The measured non-adiabatic temperature changes along the tested NiTi coiled wires varied with the test speed. A maximum temperature change of 13.5 °C was obtained for a speed of 1.2 mm s−1. The uncoiling-coiling test showed to be a suitable method for studying the elastocaloric effect and the mechanical behavior of NiTi alloys. From a practical point of view, pseudoelastic NiTi coiled wire can provide a NiTi wire high strain rate locally, and meanwhile provide a time long enough for heat transferring between active material and heat flow medium.
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This work was supported by (a) Key-Area Research and Development Program of Guangdong Province (2019B90907002) and (b) Scientific and Technological Innovation Foundation of Shunde Graduate School, USTB (BK19BE026).
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Zhao, X., Neves, F. & Correia, J.B. Elastocaloric Performance of Pseudoelastic NiTi Coiled Wires. Shap. Mem. Superelasticity 7, 101–108 (2021). https://doi.org/10.1007/s40830-021-00310-9
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DOI: https://doi.org/10.1007/s40830-021-00310-9