Wearable Body Temperature Sensing with Autonomous Self‐regulated Joule Heating and Passive Cooling for Healthcare Applications

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 2, 2025

Abstract The positive temperature coefficient (PTC) effect observed in conductive polymer composites (CPCs) holds significant promise due to its wide materials selection and ability offer enhanced sensitivity. However, traditional CPCs have relatively high PTC switching temperatures (typically above 100 °C) are often unsuitable for bodily healthcare devices. This study introduces a novel approach leveraging the synergistic of an eco‐friendly fatty acid, namely lauric acid (LA), with flexible styrene‐ethylene‐butylene‐styrene (SEBS) thermoplastic elastomer (TPE) as matrix graphene nanoplatelets (GNPs) filler. composite film demonstrates exceptional responsiveness at body‐relevant (35–40 intensity reaching unprecedented 4 orders magnitude, set apart by fine‐tuning across remarkable detecting interval (Maximum resistance (TCR): 471.4% °C −1 ). advancement is facilitated through carefully engineered morphology, wherein distribution LA significantly influences network's reformation within composite, in‐situ optical microscope used reveal network structure. potential body sensing, self‐regulating heating, passive cooling, paving way future developments eco‐friendly, highly sensitive, sensors wearable health monitoring thermotherapy.

Language: Английский

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Enhancing thermal energy storage: The impact of inclined enclosure geometry and artificial neural network based modeling on phase change material melting performance

Journal of Energy Storage, Journal Year: 2025, Volume and Issue: 114, P. 115750 - 115750

Published: Feb. 12, 2025

Language: Английский

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Understanding Melt Pool Behavior of 316L Stainless Steel in Laser Powder Bed Fusion Additive Manufacturing

Micromachines, Journal Year: 2024, Volume and Issue: 15(2), P. 170 - 170

Published: Jan. 23, 2024

In the laser powder bed fusion additive manufacturing process, quality of fabrications is intricately tied to laser-matter interaction, specifically formation melt pool. This study experimentally examined intricacies pool characteristics and surface topography across diverse powers speeds via single-track scanning on a bare plate for 316L stainless steel. The results reveal that presence layer amplifies instability worsens irregularities due increased absorption introduction uneven mass from powder. To provide comprehensive understanding dynamics, high-fidelity computational model encompassing fluid heat transfer, vaporization, solidification was developed. It validated against measured dimensions morphology, effectively predicting conduction keyholing modes with irregular features. Particularly, explained forming mechanisms defective termed swell-undercut, at high power speed conditions, detailing roles recoil pressure liquid refilling. As an application, multiple-track simulations replicate features cubic samples under two distinct process showcasing potential interaction optimization.

Language: Английский

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Integrated simulation method and experimental validation for the vacuum induction melting process

Journal of Materials Research and Technology, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 1, 2024

Language: Английский

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Numerical study on the moving and melting characteristics of paraffin particle group

Powder Technology, Journal Year: 2025, Volume and Issue: unknown, P. 120698 - 120698

Published: Jan. 1, 2025

Language: Английский

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Numerical Investigation of the Effect of the Mushy Zone Parameter and the Thermal Properties of Paraffin‐Based PCMs on Solidification Modeling Under T‐History Conditions

Energy Storage, Journal Year: 2025, Volume and Issue: 7(1)

Published: Jan. 27, 2025

ABSTRACT Phase change materials (PCMs) are widely used in various critical applications because of their capacity to store thermal energy and regulate temperature effectively. A review the literature on PCM solidification melting simulations reveals that accuracy these is highly dependent input parameters underlying assumptions software. Among key factors influencing precise simulation results parameter mushy zone () properties material. This study numerically investigated impact behavior a paraffin test tube under T‐history conditions. The analysis was conducted using commercial CFD software ANSYS Fluent enthalpy‐porosity method applied process. To accurately reflect conditions experiment, radiative heat transfer between surfaces employed for boundary conditions, ensuring realistic representation experimental setup. An evaluation four properties—thermal conductivity, density, latent heat, specific heat—indicates while an increase slows down rate solidification, conductivity has opposite effect, accelerating further emphasize selecting appropriate value crucial achieving accurate simulations. Increasing from enhanced prediction time by 10%. Additionally, significantly affects shape progression solidification. As increases, lower layers decreases, concentrating process more adjacent cold wall.

Language: Английский

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Optimizing Thermal Performance of Hollow Cylindrical Latent Heat Storage Units: Insights into Geometry-Driven Heat Transfer Enhancements

Energy, Journal Year: 2025, Volume and Issue: unknown, P. 135750 - 135750

Published: March 1, 2025

Language: Английский

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Influence of the inner tube rotation and translation associated movement on the charging performance for the latent heat thermal energy storage exchangers

Renewable Energy, Journal Year: 2024, Volume and Issue: unknown, P. 121531 - 121531

Published: Oct. 1, 2024

Language: Английский

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Optimizing the thermal performance and heat losses of self-stored U-tube based ETC for residential water heating applications: A combined experimental and theoretical approach

Journal of Energy Storage, Journal Year: 2024, Volume and Issue: 84, P. 110617 - 110617

Published: Feb. 9, 2024

Language: Английский

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Comparison of Different Numerical Models for Solidification of Paraffin-Based PCMs and Evaluation of the Effect of Variable Mushy Zone Constant

Energies, Journal Year: 2024, Volume and Issue: 17(23), P. 5982 - 5982

Published: Nov. 28, 2024

The impact of the mushy zone parameter (Amushy) and chosen numerical model during solidification a commercial paraffin-type phase change material (PCM) in vertical cylinder under T-history conditions was examined through simulations. cooling process modeled using three methods implemented CFD software ANSYS Fluent 2020 R2: enthalpy–porosity method, apparent heat capacity (AHC) new proposed by authors which incorporates directly into Fluent. To accurately define boundary conditions, radiative transfer between surfaces taken account. Furthermore, influence on simulation accuracy rate investigated, with being treated as function liquid fraction. results indicate that aligns closely experimental data regarding temperature, offering better predictions compared to other models. It observed temperature varies time but not position, suggesting this more effectively satisfies lumped system condition—an essential characteristic experiment—compared methods. Additionally, analysis showed higher enhances simulations predicts shorter time; approximately 11% for E-p 7% AHC model. Using variable based fraction also produced similar results, resulting an increased rate.

Language: Английский

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