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Mechanocaloric Effects Characterization of Low-Crystalline Thermoplastic Polyurethanes Fiber.
Polymers (Basel)
November 2024
School of Microelectronics, Southern University of Science and Technology, Shenzhen 518055, China.
Mechanocaloric cooling/heat pumping with zero carbon emission and high efficiency shows great potential for replacing traditional refrigeration with vapor compression. Mechanocaloric prototypes that are developed using shape memory alloys (SMAs) face the problems of a large driving force and high cost. In this work, we report a low-crystalline thermoplastic polyetherurethane (TPU) elastomer fiber with a low actuation force and good mechanocaloric performance.
View Article and Find Full Text PDFRo-Vibrational Spectrum of Vanadium Monoxide (VO) at 10 μm.
J Phys Chem A
December 2024
Institute of Physics, University of Kassel, Heinrich-Plett Str. 40, 34132 Kassel, Germany.
The high resolution ro-vibrational spectrum of the diatomic molecule vanadium oxide (VO) in the gas phase was measured around 1000 cm. In total, 1529 ro-vibrational transitions were assigned, in a spectral range of 984-1036 cm. For many transitions, the hyperfine structure resulting from the nuclear spin of V were resolved and the molecular parameters for the first ( = 1) and second ( = 2) excited vibrational state of VO were derived.
View Article and Find Full Text PDFEffect of thermal radiation on unsteady magneto-hybrid nanofluid flow in a -shaped wavy cavity saturated porous medium.
Front Chem
November 2024
Department of Electrical Engineering, College of Engineering, University of Ha'il, Ha'il City, Saudi Arabia.
Article Synopsis
- The study investigates how natural convection behaves in a hybrid nanofluid (AlO-Cu-water) within an inverse U-shaped cavity, influenced by an external magnetic field and including porous media effects for realism in industrial applications.
- The cavity features partially heated upper walls and wavy cooling walls, and the research employs a FORTRAN code with a finite difference method to solve the governing equations, confirming model accuracy through comparisons with prior studies.
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Enhancement of the Elastocaloric Performance of Natural Rubber by Forced Air Convection.
Polymers (Basel)
October 2024
Departament de Física de la Matèria Condensada (FMC), Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona, Catalonia, Spain.
We study the enhancement of the elastocaloric effect in natural rubber by using forced air convection to favour heat extraction during the elongation stage of a stretching-unstretching cycle. Elastocaloric performance is quantified by means of the adiabatic undercooling that occurs after fast removal of the stress, measured by infrared thermography. To ensure accuracy, spatial averaging on thermal maps of the sample surface is performed since undercooled samples display heterogeneities caused by various factors.
View Article and Find Full Text PDFTropical cyclone activity over western North Pacific favors Arctic sea ice increase.
Nat Commun
November 2024
College of Meteorology and Oceanography, National University of Defense Technology, Changsha, China.
Article Synopsis
- Teleconnections between the tropics and Arctic have gained scientific attention, focusing on how tropical cyclones affect Arctic sea ice variability.
- The study finds a significant positive link between tropical cyclone activity in the western North Pacific and Arctic sea ice concentration, especially with a 30-day delay.
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