Article
Thermodynamics
Thibaut Desguers, Adam Robinson
Summary: Energy storage, particularly thermal storage, plays a crucial role in achieving decarbonisation of the energy sector. However, current high-temperature insulation technologies suffer from decreased efficiency and lack structural strength. This paper presents an analysis of the thermal efficiency of non-uniform rectangular honeycomb structures and demonstrates their higher thermal efficiency compared to uniform structures. These findings provide valuable insights for the development of manufacturing processes in this field.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Materials Science, Ceramics
Xiaohan Wang, Shen Bao, Feiyue Hu, Siyang Shang, Yongqiang Chen, Na Zhao, Rui Zhang, Biao Zhao, Bingbing Fan
Summary: Three-dimensional honeycomb Ag/Ti3C2Tx hybrid materials were produced using a microwave hydrothermal method, which showed excellent electromagnetic interference shielding (EMIS) performance and retained the advantages of lightweight and hydrophobicity.
CERAMICS INTERNATIONAL
(2022)
Article
Mechanics
Meysam Sheykhi
Summary: The vibroacoustic performance of star-shaped honeycomb-core annular cellular structures is investigated and compared with hexagonal honeycomb-core annular structures, showing the superiority of the star-shaped structures. The spectral element method is used to evaluate natural frequencies and dynamic responses accurately, and the mechanical and vibroacoustic characteristics of the structures are analyzed by deriving the in-plane effective shear modulus of star-shaped honeycombs.
ARCHIVE OF APPLIED MECHANICS
(2023)
Article
Engineering, Multidisciplinary
Sahar Choukir, Derek Aranguren van Egmond, Benjamin D. Hatton, Glenn D. Hibbard, Chandra Veer Singh
Summary: The development of additive manufacturing allows for precise manufacturing of lattice materials. This study investigates the effect of disorder properties of honeycombs on stiffness, strength, fracture toughness, and crack propagation paths. The results show that pseudo-order realizations with moderate disorder demonstrate the best strength-toughness trade-off. With increased plasticity, there is a significant increase in fracture toughness but a decrease in strength compared to regular honeycombs.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2023)
Article
Thermodynamics
Chaoling Han, Lidan He, Zhizheng Tian, Bo Xu, Zhenqian Chen
Summary: This study evaluated a new heat dissipation device with a composite heat sink of a loop heat pipe system for efficient cooling of electronic components. Experimental results showed that fitting a graphene copper foil heat sink significantly improved temperature performance and reduced hot spot temperatures under different heat loads. The study proposed a valuable method for improving chip cooling uniformity and heat management of the system.
APPLIED THERMAL ENGINEERING
(2022)
Article
Polymer Science
Olimpia Basurto-Vazquez, Elvia P. Sanchez-Rodriguez, Graham J. McShane, Dora I. Medina
Summary: This study investigates 3D-printed PET-G honeycomb structures with different infill densities and printing orientations to evaluate their energy absorption effectiveness. The results showed that structures with upright printing direction and 100% infill density exhibited superior energy absorption performance.
Article
Engineering, Civil
Faisal Ahmed Shanta, Md Abdullah Al Bari
Summary: This study investigates the structural response of various types of cellular structures in compression loading and found that the honeycomb structure absorbs the maximum energy compared to other structures. The increase in cell size also reduces the energy-absorbing ability of cellular structures.
STRUCTURAL ENGINEERING AND MECHANICS
(2022)
Article
Chemistry, Physical
Yufei Zhang, Lei Wu, Aijaz Ahmed Babar, Xinglei Zhao, Xianfeng Wang, Jianyong Yu, Bin Ding
Summary: This work presents a biomimetic nanofibrous membrane water harvester with a highly ordered honeycomb structure, featuring super flexibility, high tensile strength, superior elasticity, and excellent moisture absorption performance for efficient water collection.
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
Engineering, Marine
Shuangxi Xu, Wenwu Zhang, Guoxian Hu, Wei Shen, Shulin Zeng, Haibo Xu
Summary: This paper investigates the mechanism of Kevlar reinforced honeycomb structure against fragment attack and conducts experimental and numerical simulations. The results demonstrate that the Kevlar reinforced honeycomb structure can effectively enhance the resistance of side cabin structure to fragment impact.
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
Chemistry, Multidisciplinary
Yongfeng Ju, Roohollah Babaei-Mahani, Raed Khalid Ibrahem, Shoira Khakberdieva, Yasir Salam Karim, Ahmed N. Abdalla, Abdullah Mohamed, Mustafa Z. Mahmoud, Hafiz Muhammad Ali
Summary: This study investigates the influence of geometry modifications and heat transfer flow patterns on the performance of a vertical triplex-tube latent heat container. The results show that using frustum tubes can increase the discharging rate and reduce the solidification time, while the direction of heat transfer flow also affects the discharging rate.
Article
Materials Science, Multidisciplinary
David Koellner, Swantje Simon, Sebastian Niedermeyer, Isabella Spath, Edwyn Wolf, Ken-ichi Kakimoto, Tobias Fey
Summary: Optimizing renewable energy harvesting is crucial in the coming decades. Ceramic auxetic and honeycomb structures made of BCZT produced via injection molding are studied for their mechanical and piezoelectric properties. The structural angle (theta) is found to affect compressive strength, Young's modulus, and Poisson's ratio. Experimental results demonstrate higher compressive strength (95 MPa) and piezoelectric constants (d(33) and g(33)) than expected.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Energy & Fuels
S. R. Akhil Krishnan, Suresh Sivan, V. C. Midhun, Soumya Ranjan Behera
Summary: Advancements in PCM technology provide adaptable solutions for high heat dissipation in electronic devices. This study investigates the influence of NPG as a solid-solid phase transition PCM on the functionality of a heat pipe-assisted heat sink. Experimental and numerical analysis shows that the integration of PCM and heat pipe in the heat sink outperforms other configurations, with a maximum enhancement ratio of 3.29. The heat sink assembly with 99% PCM and heat pipe demonstrates the most significant results, while the assembly without heat pipe performs best for 66% PCM.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Polymer Science
Lucia Doyle
Summary: The foaming behavior of polybutene-1 (PB-1) was studied, showing promising results for its foamability and potential applications in products such as pre-insulated pipes. Further research in this polymer's foaming process is needed to explore its full potential.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Thermodynamics
Mahsa Taghavi, Swapnil Sharma, Vemuri Balakotaiah
Summary: This study investigates the natural convection effects in the insulation layers of spherical storage tanks and their impact on the tanks' performance. The permeability and Rayleigh number of the insulation material are considered as key factors. The results show that as the Rayleigh number increases, new convective cells emerge and cause the cold boundary to approach the external hot boundary. In the case of large temperature differences, multiple solutions may coexist.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinyang Xu, Fangjun Hong, Chaoyang Zhang
Summary: This study introduces a self-induced jet impingement device for enhancing pool boiling performance in high power electronic cooling. Through visualization and parametric investigations, the effects of this device on pool boiling performance are studied, revealing the promotion of additional liquid supply and vapor exhausting. The flow rate of the liquid jet is found to positively impact boiling performance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Wenchao Ke, Yuan Liu, Fissha Biruke Teshome, Zhi Zeng
Summary: Underwater wet laser welding (UWLW) is a promising and labor-saving repair technique. A thermal multi-phase flow model was developed to study the heat transfer, fluid dynamics, and phase transitions during UWLW. The results show that UWLW creates a water keyhole, making the welding environment similar to in air laser welding.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Xingrong Lian, Lin Tian, Zengyao Li, Xinpeng Zhao
Summary: This study investigates the heat transfer mechanisms in natural fiber-derived porous structures and finds that thermal radiation has a significant impact on the thermal conductivity in low-density regions, while natural convection rarely occurs. Insulation materials derived from micron-sized natural fibers can achieve minimum thermal conductivity at specific densities. Strategies to lower the thermal conductivity include increasing porosity and incorporating nanoscale pores using nanosize fibers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Yasir A. Malik, Kilian Koebschall, Stephan Bansmer, Cameron Tropea, Jeanette Hussong, Philippe Villedieu
Summary: Ice crystal icing is a significant hazard in aviation, and accurate modeling of sticking efficiency is essential. In this study, icing wind tunnel experiments were conducted to quantify the volumetric liquid water fraction, sticking efficiency, and maximum thickness of ice layers. Two measurement techniques, calorimetry and capacitive measurements, were used to measure the liquid water content and distribution in the ice layers. The experiments showed that increasing wet bulb temperatures and substrate heat flux significantly increased sticking efficiency and maximum ice layer thickness.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinqi Hu, Tongtong Geng, Kun Wang, Yuanhong Fan, Chunhua Min, Hsien Chin Su
Summary: This study experimentally examined the heat dissipation of vibrating fans and demonstrated its inherent mechanism through numerical simulation. The results showed that the flow fields induced by the vibrating blades exhibited pulsating features and formed large-scale and small-scale vortical structures, significantly improving heat dissipation. The study also identified the impacts of different blade structures and developed a trapezoidal-folding blade, which effectively reduced the maximum temperature of the heat source and alleviated high-temperature failure crisis.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Dan-Dan Su, Xiao-Bin Li, Hong-Na Zhang, Feng-Chen Li
Summary: The boiling heat transfer of low-boiling-point working fluid is a common heat dissipation technology in electronic equipment cooling. This study analyzed the interfacial boiling behavior of R134a under different conditions and found that factors such as the initial thickness of the liquid film, solid-liquid interaction force, and initial temperature significantly affect the boiling mode and thermal resistance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinyi Wu, Dongke Sun, Wei Chen, Zhenhua Chai
Summary: A unified lattice Boltzmann-phase field scheme is proposed to simulate dendrite growth of binary alloys in the presence of melt convection. The effects of various factors on the growth are investigated numerically, and the model is validated through comparisons and examinations.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Shaokun Ge, Ya Ni, Fubao Zhou, Wangzhaonan Shen, Jia Li, Fengqi Guo, Bobo Shi
Summary: This study investigated the temperature distribution of main cables in a suspension bridge during fire scenarios and proposed a prediction model for the maximum temperature of cables in different lane fires. The results showed that vehicle fires in the emergency lane posed a greater thermal threat to the cables.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Shuang-Ying Wu, Shi-Yao Zhou, Lan Xiao, Jia Luo
Summary: This paper investigates the two-phase flow and heat transfer characteristics of low-velocity jet impacting on a cylindrical surface. The study reveals that the heat transfer regimes are non-phase transition and nucleate boiling with the increase of heat transfer rate. The effects of jet impact height and outlet velocity on local surface temperatures are pronounced at the non-phase transition stage. The growth rates of heat transfer rate and liquid loss rate increase significantly from the non-phase transition to nucleate boiling stage.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Emad Hasani Malekshah, Wlodzimierz Wlodzimierz, Miros law Majkut
Summary: Cavitation has significant practical importance and can be controlled by air injection. This study investigates the natural to ventilated cavitation process around a hydrofoil through numerical and experimental methods. The results show that the location and rate of air injection have a meaningful impact on the characteristics of cavitation.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Feriel Yahiat, Pascale Bouvier, Antoine Beauvillier, Serge Russeil, Christophe Andre, Daniel Bougeard
Summary: This study explores the enhancement of mixing performance in laminar flow equipment by investigating the generation of chaotic advection using wall deformations in annular geometries. The findings demonstrate that the combined geometry can achieve perfect mixing at various Reynolds numbers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Hui He, Ning Lyu, Caihua Liang, Feng Wang, Xiaosong Zhang
Summary: This study investigates the condensation, frosting, and defrosting processes on superhydrophobic surfaces with millimeter-scale structures. The results reveal that the structures can influence the growth and removal of frost crystals, with the bottom grooves creating a frost-free zone and conical edges promoting higher frost crystal heights. Two effective methods for defrosting are observed: hand-lifting the groove and airfoil retraction contraction on protruding structures. This research provides valuable insights into frost formation and defrosting on millimeter-structured superhydrophobic surfaces, with potential applications in anti-frost engineering.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Thiwanka Arepolage, Christophe Verdy, Thibaut Sylvestre, Aymeric Leray, Sebastien Euphrasie
Summary: This study developed two thermal concentrators, one with a 2D design of uniform thickness and another with a 3D design, using the coordinate transformation technique and metamaterials. By structuring the thermal conductor, the desired local density-heat capacity product and anisotropic thermal conductivities were achieved. The homogenized thermal conductivities were obtained from finite element simulations and cylindrical symmetry consideration. A 3D concentrator was fabricated using 3D metal printing and characterized using a thermal camera. Compared to devices that solely consider anisotropic conductivities, the time evolution characteristics of the metadevice designed with coordinate transformation were closer to those of an ideal concentrator.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Liangyuan Cheng, Qingyang Wang, Jinliang Xu
Summary: In this study, we investigated the supercritical heat transfer of CO2 in a horizontal tube with a diameter of 10.0 mm, covering a wide range of pressures, mass fluxes, and heat fluxes. The study revealed a non-monotonic increase in wall temperatures along the flow direction and observed both positive and negative wall temperature differences between the bottom and top tube. The findings were explained by the thermal conduction in the solid wall interacting with the stratified-wavy flow in the tube.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)