Microsystems & Nanoengineering
·
2024
·Vol. 10
·期 1
·1-12
·
IF 7.3
Dong Helei,Lu Meimei,Wang Weifeng,Tan Qiulin
Hypersonic vehicles and aircraft engine blades face complex and harsh environments such as high heat flow density and high temperature, and they are generally narrow curved spaces, making it impossible to actually install them for testing. Thin-film heat flux sensors (HFSs) have the advantages of small size, fast response, and in-situ fabrication, but they are prone to reach thermal equilibrium and thus fail during testing. In our manuscript, an ITO–In 2 O 3 thick film heat flux sensor (HFS) is designed, and a high-temperature heat flux test system is built to simulate the working condition of a blade subjected to heat flow impact. The simulation and test results show that the test performance of the thick-film HFS is improved by optimizing the structure and parameters. Under the condition of no water cooling, the designed HFS can realize short-time heat flux monitoring at 1450 °C and long-term stable monitoring at 1300 °C and below. With a maximum output thermopotential of 17.8 mV and an average test sensitivity of 0.035 mV/(kW/m 2 ), the designed HFS has superior high-temperature resistance that cannot be achieved by other existing thin (thick) film HFSs. Therefore, the designed HFS has great potential for application in harsh environments such as aerospace, weaponry, and industrial metallurgy.
研究领域:
航空航天工程
·
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POWDER TECHNOLOGY
·
2017
·
IF 2.942
Yanwei Hu,Ziyu Liu,Yurong He
Boiling heat transfer is widely used in energy power equipment, while the poor thermal property conventional fluids cannot meet the increase of heat transfer demand. The addition of nanoparticles into base fluids can modify the properties of base fluids and is a potential way to improve heat transfer characteristics. In present work, amorphous SiO 2 nanoparticles with an average size of 98 nm were synthesized via Stober process. And they were added into water with different mass fractions to investigate the pool boiling heat transfer characteristics. The heat transfer coefficient and critical heat flux were analyzed. Results show that the heat transfer coefficient of all fluids increases rapidly in the natural convective region but then rises gradually in the nucleate boiling region. Moreover, owing to the deposition of SiO 2 nanoparticles, the heat transfer coefficients of SiO 2 -H 2 O nanofluids are lower than that of the base fluid and reduce as the concentration increase. On the other hand, because of the wettability improvement of the heating wire surface caused by the deposition of SiO 2 nanoparticles, the critical heat fluxes of nanofluids are higher than that of the base fluid. When the concentration is 0.081%, the critical heat flux achieves a peak improvement of approximately 68.8%.
研究领域:
热力学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Guoqin Jiang,Zongyi Deng,Minxian Shi,Wei Zhang,Yang Liu,Wenjing Cao,Linqin Gao,Yanbin Wang,Zhixiong Huang
Carbon fiber/phenolic resin (CF/Ph) composites are widely used as outer surface thermal protection materials in hypersonic vehicles because of their excellent ablation resistance. As the flight speed of the vehicle increases, the problem of CF being prone to oxidation in high-temperature aerobic environments becomes more severe, hindering the adaptation of CF/Ph to more extreme service environments. In this study, ZrSi 2 -B 4 C was introduced into carbon fibre/boron phenolic resin (CF/BPR) to improve its ablation resistance. At 2.4 MW/m 2 , the linear ablation rate (LAR) and mass ablation rate (MAR) of the composites were as low as −0.032 mm/s and 0.0186 g/s, respectively. At 3.6 MW/m 2 , the LAR and MAR were as low as −0.005 mm/s and 0.0273 g/s, respectively. These findings indicate that the ceramizable composites exhibit excellent ablation resistance under both low and high heat flux conditions. The ablation mechanism of the composites was revealed. The in situ ceramization of ZrSi 2 and B 4 C formed a Zr-Si-B-C-O ceramic layer, which hindered the thermal oxidation and aerodynamic erosion of CF and PyC.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2022
·
IF 7.693
Chunyu Wang,Wenrui Xiang,Jiapei Du,Xiao Yao
A cement paste with low hydration heat flow is in high demand in hydrate layers cementing at low temperature to inhibit the hydrate decomposition. This paper prepared a heat flow inhibitor (HFI), which was compounded of disodium hydrogen phosphate dodecahydrate (DHPD), sodium silicate (SS) and nano calcium carbonate (NCC). DHPD was employed to reduce the heat flow of cement pastes. Porous ceramic particles were applied to carry DHPD to achieve slow-release. SS and NCC were employed to encapsulate and disperse the particles. The components were released in multi-stage into the cement paste to avoid their being blended into the cement paste at the same time. Setting time, thickening time , compressive strength , isothermal calorimetry , X-ray diffraction, mercury intrusion porosimetry and scanning electron microscopy were used to investigate the effects of HFI on cement hydration . The results showed that HFI reduced the hydration heat flow of cement pastes effectively, while displaying no negative impact on the compressive strength, setting time and thickening time. The maximum temperature of the cement paste dropped by 14.0 °C, and the maximum hydration heat flow was reduced by 28.75% at 8% HFI dosage . HFI is promising to be used in hydrate layers cementing.
研究领域:
材料科学
·
石油工程
✓ 已验证
产品关联
DOI
高影响因子
Case Studies in Thermal Engineering
·
2023
·
IF 6.8
Jing Fan,Dazhi Gao,Fenhong Song
Deep eutectic solvents are now widely used in metal electrochemical deposition, biomass catalysis and material synthesis because of their advantages of greenness, low cost, good biocompatibility and biodegradability, and it is proved that DESs have great potential for its utilization as heat transfer fluids. In this work, eight DESs were prepared by thermal method using choline chloride as the hydrogen bond acceptor and glycerol, polyethylene glycol 600, lactic acid and o-cresol as the hydrogen bond donor. Based on the flow calorimetry method, the specific heat capacity system was established and its reliability and precision were verified by measuring the specific heat capacity of deionized water. The maximum deviation of the experimental value and the standard value under the pressure 101 kPa was 2.03%, and the average absolute deviation was 1.01%, and the repeatability was less than 1.5%. Then, the densities and the constant pressure specific heat capacities of eight DESs in the temperature range of 293 K–353 K and 293 K–373 K were measured respectively. The experimental results could support for the scale utilization of DESs.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Zhiming Xu,Hongpeng Jiang,Xiaoliang Wang,Zhirong Zhang,Yunfeng Qiu,Jie Xu,Debin Shan,Bin Guo
Pool boiling offers exceptional heat transfer performance, making it crucial for advanced thermal management. However, simultaneously optimizing both critical heat flux (CHF) and heat transfer coefficient (HTC) is challenging due to the inherent trade-off between promoting bubble nucleation and mitigating detrimental bubble coalescence. This study presents a micro/nano-hierarchical surface architecture designed to overcome this limitation. Fabricated via laser machining and chemical vapor deposition, the architecture comprises an array of micro pits (MPs) decorated with Co-catalyzed carbon nanotubes (CoCNTs). Computational fluid dynamics (CFD) simulations demonstrate that the MP array enhances HTC by increasing the density of nucleation sites and reducing the bubble departure diameter. Simultaneously, the CoCNTs within the MPs enhance interfacial heat transfer and promote capillary-driven liquid replenishment to the heating surface, effectively mitigating dry-out and significantly improving CHF. The synergistic effects of these micro/nanofeatures yield remarkable performance enhancements on Cu substrates, with the HTC and CHF increasing by 211.5% and 125.2%, respectively, compared to a bare Cu surface. This hierarchical surface design offers a promising strategy for developing high-performance boiling heat transfer surfaces for next-generation thermal management applications.
研究领域:
热能工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Nano
·
2023
·
IF 10.3
Xinyu Yin,Liying Liu,Yuanyang Yan,Kangquan Yang,Pihui Pi,Xiaoe Peng,Xiufang Wen
Pipeline transportation suffers from high-viscosity crude oil, wax-deposition, and hydrates blockage. Superamphiphobic surfaces with excellent repellency to various liquids have been proposed to solve those problems. However, they may lose superamphiphobicity once their micro-nanostructures were wetted by condensate droplets or hot fluids that require heat to improve liquidity. Here, we report a superamphiphobic P(HFIO)@SiO 2 @SS with a high aperture ratio pore structures (denoted as the PSSH) to resist water/oil-droplet-condensation and repel hot fluids. Its interconnected high aperture ratio pore structures and ultralow surface energy fluorinated side chains enhance the penetration resistance of droplets to micro-nanostructures and the driving force for condensate droplets to spontaneously roll away from its surface. Besides, it prevents crude oil (25 °C−72 °C) from sticking to its surface (25 °C), as well as molten paraffin droplets (104 °C) from adhering to the surface (104 °C), increasing the flow rate of 4–35 times. In addition, the PSSH reduces adhesive force to hydrates (3.2 °C) and wax (25 °C) by 92.1% and 89.4%, respectively. The PSSH demonstrates the great potential in handling pipeline blockage and improving the transport efficiency of fluids, offering alternative strategy to prepare superamphiphobic surfaces for oil and gas transportation, heat transfer, and other applications.
研究领域:
材料科学
·
化学工程
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
Energy Technology
·
2024
·
IF 3.6
Yingbiao Yuan,Jun Li,Piao Wang,Liyuan Zhang,Haidong Ju,Renjie Chen
Erythritol-based nanocapsules with a phase-change temperature of 120 °C are successfully prepared under very mild conditions. The nanocapsules are produced via multiple crystallization precipitations from a saturated erythritol aqueous solution, followed by SiO 2 coating using a sol–gel method. Their nanostructure and elemental composition are characterized using scanning electron microscopy and energy-dispersive X-ray spectroscopy. The latent heat of the nanocapsules is measured with a differential scanning calorimeter. The erythritol nanocapsules, with an average size of ≈220 nm, exhibit a melting enthalpy of 192.7 J g −1 . Notably, the supercooling degree of the nanocapsules is reduced by ≈30.0 °C compared to pure erythritol. After 200 thermal cycles, the heat storage performance of the nanocapsules shows only a 7.6% decrease. A latent heat functional thermal fluid, suitable for high-temperature heat transfer, is prepared by dispersing the nanocapsules in silicone oil. The thermal conductivity and specific heat capacity of this fluid increase by 20.5% and 283.3%, respectively, compared to pure silicone oil. These findings demonstrate that erythritol nanocapsules significantly enhance the thermal properties of high-temperature heat transfer fluids, highlighting their potential for high-temperature heat storage and transfer application.
研究领域:
材料科学
·
热能工程
✓ 已验证
产品关联
DOI
高影响因子
THERMOCHIMICA ACTA
·
2025
·
IF 3.5
Rongkun Pan,Chensheng Wang,Qingsheng Zhang,Chenzhuo Song,Chang Lu,Ligang Zheng,Bei Pei,Lei Chen
In this paper, staged thermal characteristic experiments were conducted on commonly used powder explosion suppressants using a high-precision C600 microcalorimeter. The thermal decomposition process was divided into three stages, and a comprehensive analysis was carried out on the thermal flow curves, dHF, initial heat flow value H 0 , minimum heat flow value H min , characteristic points, and heat absorption amount Q of twelve powder explosion suppressants, including attapulgite and montmorillonite. The results indicate that carbamide has the smallest minimum heat flow value H min during powder thermal decomposition, while CaCO 3 has the largest minimum heat flow value H min . Carbamide exhibited the highest overall heat absorption amount, while NaCl showed the lowest overall heat absorption amount. The mechanism of inhibiting methane explosion with different powder suppressors was analyzed by comparing the pyrolysis experiment results. The conclusions of this study can serve as a theoretical foundation for the rational selection of powder explosion suppressors, enhancing their utilization rate, and improving their explosion suppression effectiveness.
研究领域:
化学工程
·
安全科学
✓ 已验证
产品关联
DOI
高影响因子
Case Studies in Thermal Engineering
·
2024
·
IF 6.4
Junsheng Hou,Junjie Wu,Xiong Zhao,Li Ma,Lei Huang,Yinan Qiu,Dongyu Li,Zihan Ding,Zhenzhen Chen,Jinjia Wei,Nanjing Hao
Integrating microchannel flow boiling heat transfer with nanofluids is an effective method for cooling electronic devices. However, traditional methods have significant limitations in achieving facile synthesis of nanofluids with desirable properties. In this study, we propose a straightforward synthesis strategy using microfluidic reactors, which enables continuous and high-throughout synthesis of Al 2 O 3 nanofluids with high purity and long-term stability. These nanofluids were found to enhance boiling heat transfer performance by delaying bubbles coalescence, increasing surface nucleation sites, improving the nucleation rate, and enhancing wettability by observation of the bubble behavior. Specifically, the critical heat flux (CHF) and corresponding heat transfer coefficient (HTC) are increased by a maximum of 32 % and 26 %, respectively, with negligible change in pressure drop. Moreover, the heat transfer performance deteriorates with increasing concentration of alumina nanofluids. These findings not only provide guidance of microchannel flow boiling with nanofluids, but also present valuable insights for the application of nanofluids in two-phase cooling systems for electronic devices.
研究领域:
材料科学
·
热能工程
·
电子冷却技术
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 4
·668
·
IF 5.719
Qingyun Li,Lingyu Liu,Zihua Wang,Xuezhong Wang
A confined jet mixing reactor operated in continuous hydrothermal flow synthesis was investigated for the synthesis of CeO2-ZrO2(CZ) nanoparticles. The obtained ultrafine powders were characterized using scanning electron microscopy–energy dispersive spectrometry (SEM-EDS), inductively coupled plasma–atomic emission spectroscopy (ICP-AES), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray diffraction analysis (XRD), transmission electron microscopy (TEM) coupled with selected area electron diffraction (SAED), a BET (Brunauer-Emmett-Teller)-specific surface area test and pore analysis, oxygen storage capacity (OSC) test, and a H2temperature programmed reduction (H2-TPR) test. The XRD results show that all samples were composed of high-purity cubic CZ nanoparticles. High resolution transmission electron microscope (HR-TEM) analysis showed that CZ nanoparticles with uniform size and shape distributions were obtained in this investigation. The d-spacing values, determined based on the TEM-selected area electron diffraction (SAED) patterns, were in good agreements with the reference data. BET results showed that the prepared CZ samples had large specific surface areas. Pore volume and size distribution were obtained by pore analysis. Oxygen pulse adsorption technology was used to test the oxygen storage capacity of the sample. The redox capacity of the CZ material was determined by a H2temperature-programmed reduction test.Keywords:continuous hydrothermal flow synthesis;confined jet mixing reactor;CeO2-ZrO2nanoparticles;XRD;BET
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Nano
·
2023
·
IF 10.3
Junsheng Hou,Junjie Wu,Hongqiang Chen,Lei Huang,Li Ma,Xiong Zhao,Zihan Ding,Yonghai Zhang,Jiabin Fang,Jinjia Wei,Satoshi Watanabe,Nanjing Hao
Microchannel flow boiling heat transfer with nanofluids is an effective approach to enhance the heat transfer performance of high-power electronics. However, conventional nanofluids are plagued by laborious fabrication procedures, poor stability, and uncontrollable nanoparticle sizes, which compromise the overall heat transfer efficiency. To address these challenges, a facile microfluidic synthesis strategy is developed to prepare highly stable and size-controllable silica nanofluids in a continuous, efficient, and high-throughput methodology. The introduction of silica nanofluid aims to facilitate surface bubble formation and delay coalescence, ultimately enhancing the critical heat flux (CHF) and heat transfer coefficient (HTC) for efficiently cooling silica chips. Through the specifically designed spiral microchannel reactor, nanofluids with controllable nanoparticle sizes ranging from several tens of nanometers to a few hundreds of nanometers can be synthesized with long-term (>30 days) dispersion stability at both room temperature (25 °C) and high temperature (75 °C). Importantly, with negligible changes in pressure drop, the CHF and HTC of the synthesized nanofluids increase by maximum of 55 % and 63 % respectively compared to the basic fluid. Furthermore, our results suggest that smaller-sized nanoparticles outperform larger ones at higher flow rates . These findings not only provide important guidelines for the controllable preparation of nanofluids, but also shed new light on the rational design of efficient nanosystems for two-phase cooling.
研究领域:
材料科学
·
热力学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）