Article
Chemistry, Analytical
Lukang Wang, You Zhao, Yu Yang, Manman Zhang, Yulong Zhao
Summary: This study investigates the effects of processing parameters on the results of femtosecond laser ablation of SiC material, providing insights for achieving precise, controllable, and high-quality machining of SiC using infrared femtosecond laser.
Article
Materials Science, Ceramics
W. Amsellem, H. Yazdani Sarvestani, V. Pankov, Y. Martinez-Rubi, J. Gholipour, B. Ashrafi
Summary: This study explores the use of a fiber picosecond laser for subtractive manufacturing of SiC ceramic, aiming for minimal surface damage and high precision. Various laser processing parameters were analyzed to achieve deep high-quality cuts with minimum surface roughness and redeposited material. The study also identified processing parameters for shallow and deep high-precision SiC cutting.
CERAMICS INTERNATIONAL
(2023)
Article
Optics
Jianbo Chen, Xiaoxiao Chen, Xuanhua Zhang, Wenwu Zhang
Summary: Silicon carbide ceramics, as a representative high-performance material, have excellent properties and find broad applications in various fields. Laser processing, as a non-contact method, offers great potential for the processing of hard and brittle materials. In this study, laser ablations of silicon carbide ceramics were carried out with different process parameters. The results showed the effect of incidence angle and laser power on the ablation morphology. This work provides technical and theoretical support for laser surface processing with multiple incidence angles, especially for complex curved parts.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Mulong Liu, Wenmi Shi, Qiyuan Sun, Huimin Huang, Zhizhou Lu, Yuanyuan Wang, Yanan Cai, Chang Wang, Yao Li, Wei Zhao
Summary: In this study, a novel mechanism for dark pulse excitation in normal dispersion microresonators utilizing free carrier dispersion and absorption effects due to multi-photon absorption is theoretically demonstrated. Dark pulses can be generated in the presence or absence of external reverse bias to control the lifetime of free carriers, in both three- and four-photon absorption regimes. The direct generation of dark pulses has been proven feasible with a fixed frequency laser, along with an investigation into the temporal and spectral evolution dynamics of dark pulses.
Article
Engineering, Manufacturing
Weidong Liu, Benxin Wu
Summary: While micromachining SiC remains challenging, HIFU-based UWLM process shows potential in improving machining rate and quality, and solves issues in laser machining process through in-situ ultrasound cleaning effect.
JOURNAL OF MANUFACTURING PROCESSES
(2023)
Article
Chemistry, Analytical
Shunping Li, Xinchang Wang, Guojie Chen, Zhongke Wang
Summary: Laser ablation of semiconductor silicon has been extensively studied. In ultrashort pulse domain, the threshold for pulse energy fluence in silicon ablation strongly depends on the pulse width. However, the energy fluence threshold dependence on pulse width in the nanosecond pulse scale is not well understood. This study elucidates the interaction energy dependency on pulse width in ns NIR laser ablation of silicon.
Article
Engineering, Electrical & Electronic
Yen-Wei Hsueh, Chih-Hsien Cheng, Cai-Syuan Fu, Huai-Yung Wang, Bo-Ji Huang, Gong Lin
Summary: The study demonstrates the all-optical cross-wavelength QAM-OFDM data switching in Si-rich SiC micro-ring waveguide for the first time, achieving a data rate approaching 3 Gbit/s with FEC qualified criteria, SNR of 9.49 dB, BER of 1.4 x 10(-3), and EVM of 33.5%.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Article
Physics, Applied
Soeren Schaefer, Anja Mercker, Adrian Koehler, Tobias Neubert, Larissa Mettner, Bettina Wolpensinger, Verena Mertens, Robby Peibst
Summary: This study presents a laser-based approach to structure the poly-Si layer after deposition, confining the passivated contacts to local regions underneath metal contacts to prevent parasitic light absorption. Different laser fluences affect the etch resistiveness of the modified poly-Si layer, with oxygen incorporation in certain fluences enhancing the etch barrier. A phenomenological model of the findings is also presented at the end.
JOURNAL OF APPLIED PHYSICS
(2021)
Review
Optics
De-Rong Sun, Gong Wang, Yunfei Li, Yu Yu, Chengbin Shen, Yulei Wang, Zhiwei Lua
Summary: This paper investigates the application of laser processing in silicon carbide (SiC). Based on the classification of pulse widths, the removal mechanisms of SiC using nanosecond and ultrafast laser are summarized, and the characteristics of laser-drilled SiC and SiC matrix composites with different pulse scales are analyzed. In addition, drilling is performed using lasers of different pulse widths in a liquid-assisted environment, and the drilling parameters are compared. Finally, laser drilling techniques for SiC and SiC matrix composites are summarized and discussed.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Chemistry, Physical
Aaron M. M. Day, Jonathan R. R. Dietz, Madison Sutula, Matthew Yeh, Evelyn L. L. Hu
Summary: In this study, we demonstrate the direct laser writing of cavity-integrated spin defects using a nanosecond pulsed above-bandgap laser, allowing real-time monitoring of silicon-monovacancy defect formation within the cavity-mode volume. We observe spin resonance, cavity-integrated photoluminescence, and excited-state lifetimes consistent with conventional methods, without the need for post-irradiation thermal annealing. This localized defect formation method, combined with cavity-integrated defect spins, is crucial for engineering cavity-emitter coupling for quantum networking.
Article
Engineering, Electrical & Electronic
Xiaohan Zhong, Huaping Jiang, Guanqun Qiu, Lei Tang, Hua Mao, Xu Chao, Xiaofeng Jiang, Jiayu Hu, Xiaowei Qi, Li Ran
Summary: This article investigates the instability of the gate threshold voltage under ac gate stresses with different duty ratios, and on and off-state gate voltages. The experiments find that no significant drift would occur even for bipolar gate stresses if the off-state gate voltage is within (higher than) the critical negative bias voltage. Additionally, both the gate voltage swing and polarity affect the speed of threshold voltage drift.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Optics
Julia Brand, Andrei Rode, Steve Madden, Alison Wain, Penelope L. King, Ludovic Rapp
Summary: This paper investigates the ultrashort pulsed laser ablation of a high heritage value Australian granite and determines the ablation threshold and efficiency of different mineral components. It is relevant to laser cleaning and maintenance of heritage stone surfaces.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Physics, Multidisciplinary
Yahaya Saadu Itas, Abdussalam Balarabe Suleiman, Chifu E. Ndikilar, Abdullahi Lawal, Razif Razali, Ismail Ibrahim Idowu, Mayeen Uddin Khandaker
Summary: This study investigates the effects of oxygen absorption on two types of single walled silicon carbide nanotubes with different chiral angles. The results show that oxygen absorption closes the band gap, transforming the materials from semiconducting to metallic, indicating potential applications in automobile gas switches for air conditioners and daylight sensors.
Article
Materials Science, Coatings & Films
Yue-Zhen Huang, Shih-Chun Tseng, Yi-Hung Chen, Hung-Yin Tsai
Summary: This study investigates the role of laser ablation in the synthesis of carbon nano-flake balls in microwave plasma chemical vapor deposition. Through systematic studies, it is found that defects on the silicon substrate and the silicon carbide layer after laser ablation are key factors for the growth of CNFBs.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Natalie Tarasenka, Vladislav Kornev, Mikalai Rzheutski, Evgenii Lutsenko, Supriya Chakrabarti, Tamilselvan Velusamy, Davide Mariotti, Nikolai Tarasenko
Summary: The capabilities of liquid-assisted laser ablation technique with additional laser irradiation of solutions for the synthesis of SiC nanocrystals (NCs) have been investigated. Nanocrystalline particles of silicon carbide were synthesized by laser irradiation of the mixture of Si and C colloidal solutions using nanosecond and femtosecond laser radiation. The characterization results proved the formation of near-spherical SiC NCs which exhibited photoluminescence (PL) in the broad spectral region of 350-600 nm.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(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)