Article
Thermodynamics
Desideri Regany, Francesc Majos, Jerome Barrau, Joan Rosell, Manuel Ibanez, Luc G. Frechette, Montse Vilarrubi
Summary: This paper proposes a liquid cooling self-adaptive heat sink that can efficiently adjust its heat extraction capacity distribution according to time-dependent and non-uniform heat loads. The self-adaptive fins are shown to improve temperature uniformity and reduce thermal resistance through numerical design and experimental evaluation, achieving energy savings.
APPLIED THERMAL ENGINEERING
(2022)
Article
Energy & Fuels
Mickael Lallart, Linjuan Yan, Hiroyuki Miki, Gael Sebald, Gildas Diguet, Makoto Ohtsuka, Manfred Kohl
Summary: The study focuses on the development of a heat engine using MultiPhysic Memory Alloys (MPMAs) to convert heat into electricity, offering a more direct energy conversion path compared to traditional mechanical heat engines. By thermally decoupling the pyroelectric element from the MPMA, higher variation frequency can be achieved.
Article
Materials Science, Multidisciplinary
Hao Li, Kuishan Sun, Xianglong Meng, Wei Cai, Liancheng Zhao
Summary: Recently, the isothermal martensitic transformation in shape memory alloys (SMAs) has been investigated, but the underlying mechanisms are still not fully understood. In this study, the isothermal transition from B2 to B19 was confirmed in Ti-Ni-Cu-Co melt-spun ribbons. A thermally activated kinetic model was developed to characterize the kinetics and it agreed well with the experimental results. It was found that the nucleation density and activation energy played important roles in the isothermal transition.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Energy & Fuels
Markus Winkler, Christian Teicht, Patrick Corhan, Angelos Polyzoidis, Kilian Bartholome, Olaf Schaefer-Welsen, Sandra Pappert
Summary: This study explores a novel approach for thermal switching using a water-loaded adsorbent as part of the evaporator of a heat pipe, which activates the heat pipe by releasing water for thermal transport. The characterization of the adsorbent, development of a predictive model, and integration into a heat pipe demonstrator were conducted to verify the predictions and demonstrate thermal switching ability. Results showed good agreement between water release predictions and thermal behaviors of the heat pipe, with varying switching ratios depending on heating power and temperature range considered.
Article
Chemistry, Multidisciplinary
Maria Chikhareva, Raj Vaidyanathan
Summary: Shape memory alloy (SMA) heat engines have the capability to sense temperature changes, perform work, and release heat through the shape memory effect caused by temperature-induced phase transformation. This study presents a comprehensive approach for designing and implementing an SMA-based Stirling heat engine to maximize torque or speed, considering mechanical, thermal, and material aspects. There is an increasing demand for such engines in thermal management and energy recovery applications in various fields.
Article
Energy & Fuels
Markus Winkler, Jan Schipper, Christian Teicht, Patrick Corhan, Angelos Polyzoidis, Kilian Bartholome, Olaf Schafer-Welsen, Sandra Pappert
Summary: This study presents an improved approach for thermal switching using a water-loaded adsorbent, demonstrating reversibility and optimizing the switching ratios.
Article
Computer Science, Interdisciplinary Applications
Ziliang Kang, Kai A. James
Summary: This article presents a novel computational design framework for shape-memory alloy-based smart structures that considers multiphysics and multimaterial aspects. The framework optimally distributes multiple material candidates within the design domain using topology optimization, and incorporates a nonlinear phenomenological constitutive model and a coupled transient heat conduction model for shape-memory alloys (SMAs). By accurately capturing the coupling between the phase transformation process and the evolution of the local temperature field, the framework enables more precise optimization of the two-way shape-memory effect and superelasticity response of SMAs.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2022)
Article
Engineering, Multidisciplinary
B. Raghu Ram, Vinit Malik, B. Kiran Naik, Kishore Singh Patel, Vivek Kumar Singh
Summary: This paper presents empirical correlations to predict the phase transition temperatures of CuAlMn shape memory alloy and analyzes the effects of Cu/Al ratio on these temperatures. It is found that the proportion of "Mn" in CuAlMn alloy plays a crucial role in achieving low-temperature actuation, enhanced switching ratio, and overall performance improvement. These findings are important for the design of mechanical heat switches for low-temperature space applications.
SADHANA-ACADEMY PROCEEDINGS IN ENGINEERING SCIENCES
(2023)
Article
Materials Science, Multidisciplinary
Zhixiang Rao, Xiaoyuan Wang, Jiaming Leng, Zehong Yan, Xiaojun Yan
Summary: This study conducted an in-depth investigation into the Ni50Ti50 SMA beam actuator from the perspective of heat treatment, training, and numerical simulation. It determined the proper heat treatment conditions and established the relationship between thermomechanical behavior evolution and training load. A comprehensive and novel forward design method was proposed, considering the evolution of shape and actuation performance during training.
MATERIALS & DESIGN
(2022)
Article
Instruments & Instrumentation
F. Niccoli, V Giovinco, C. Garion, C. Maletta, P. Chiggiato
Summary: The novel NiTi-based shape memory alloy pipe couplers are designed for room-temperature ultrahigh vacuum systems, providing a quick and compact installation and dismounting solution through remote temperature variations, especially suitable for restricted-access areas like particle accelerators.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Instruments & Instrumentation
Mengjiao Pan, Lijun Wang, Yehu Lu, Jingxian Xu, Suyan Liu
Summary: Developing fabrics with enhanced thermal protection is a cutting-edge topic in thermal protective clothing for workers. Researchers prepared temperature-responsive NiTi shape memory alloy filaments that transform into a sinusoid form under high temperature. By incorporating these filaments into various composite fabrics and traditional TPC fabric systems, they created a smart fabric system with adaptive structure. Thermal protective performance tests showed that the addition of these fabrics significantly slowed down the rise of skin surface temperature and prolonged the time to the first-degree burn. This study inspires the engineering of composite fabrics with enhanced thermal protection and advances the development of smart technology in textile engineering.
SMART MATERIALS AND STRUCTURES
(2023)
Review
Materials Science, Multidisciplinary
Jaclyn L. Cann, Anthony De Luca, David C. Dunand, David Dye, Daniel B. Miracle, Hyun Seok Oh, Elsa A. Olivetti, Tresa M. Pollock, Warren J. Poole, Rui Yang, C. Cem Tasan
Summary: Exciting metallurgical breakthroughs in recent decades have ushered in a new era in metals design, with the urgent need for new metallic materials to address current engineering challenges. While the environmental impact of the metallurgical industry is significant, the design of new metallic materials with improved properties can help tackle key environmental challenges.
PROGRESS IN MATERIALS SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
S. Buytoz, F. Dagdelen, I. N. Qader, M. Kok, B. Tanyildizi
Summary: Improving the microstructural analysis of shape memory alloys, particularly NiTiHf alloys, is crucial for various applications. Adding more hafnium in NiTiHf alloys can increase phase transformation temperatures but decrease enthalpy change for endo/exothermic processes. Oxidation studies reveal different microstructures, such as needle-like shapes and plate-like Ti-rich microstructures, depending on the composition of Ni and Hf elements in the alloys.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Dongwoo Lee, Inkyum Kim, Daewon Kim
Summary: A thermally-driven Shape Memory Alloy (SMA) wire-based hybrid generator is proposed to convert wasted heat energy into reusable electrical energy efficiently. By utilizing the unique properties of SMAs, this generator can effectively harvest thermal energy and generate electricity with high efficiency, showing promise for applications in commercial vehicles and the Internet of Things (IoT) field.
Article
Materials Science, Multidisciplinary
Shalini Singh, S. Karthick, I. A. Palani
Summary: This paper focuses on the development and performance testing of copper-based shape memory alloy coated optical fiber sensors. The study demonstrates performance differences of coated fibers at different rotational speeds, and analyzes the surface morphology, thickness, and thermal properties pre and post-coating. Static structural analysis in ANSYS Workbench reveals stress and strain in SMA coated fiber during bending.