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Thermal and hydraulic performance of a compact precooler with mini-tube bundles for aero-engine EI
期刊论文 | 2022 , 200 | Applied Thermal Engineering
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Abstract :

It is significant to evaluate whether the classical correlations based on conventional tube size (≥10 mm) is suitable for predicting the flow and heat transfers characteristics of the precooler composed of mini-tube bundles (around 1 mm). In this work, a full-scale heat transfer experiment of precooler is carried out, and the high-temperature incoming air (686 K) in the experiment was produced by burning the mixture of air and alcohol. The numerical simulation of a unit precooler is also conducted with Computational Fluid Dynamics. The classical correlations for the design of heat exchanger are evaluated by both experiments and simulations. The results indicate that the prediction error of classical correlations of flow resistance is less than 10% for both the flow inside the mini-tube and across mini-tube bundles. The classical correlation of heat transfer inside tube can meet the engineering requirements. However, the maximum deviation of Nusselt number prediction for the outside flow across tube bundles reaches 32.1%. A new correlation for calculating heat transfer across a compact precooler composed of staggered mini-tube bundles with a prediction error below 5% is finally established based on the experimental and numerical results. © 2021 Elsevier Ltd

Keyword :

Tubes (components) Heat resistance Computational fluid dynamics Aircraft engines Heat transfer Heat exchangers Engines Forecasting

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GB/T 7714 Li, Nan , Zhao, Yun , Wang, Hao et al. Thermal and hydraulic performance of a compact precooler with mini-tube bundles for aero-engine [J]. | Applied Thermal Engineering , 2022 , 200 .
MLA Li, Nan et al. "Thermal and hydraulic performance of a compact precooler with mini-tube bundles for aero-engine" . | Applied Thermal Engineering 200 (2022) .
APA Li, Nan , Zhao, Yun , Wang, Hao , Chen, Qiao , Li, Zhe , Ma, Yuan et al. Thermal and hydraulic performance of a compact precooler with mini-tube bundles for aero-engine . | Applied Thermal Engineering , 2022 , 200 .
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Measurement and identification of temperature-dependent thermal conductivity for thermal insulation materials under large temperature difference EI
期刊论文 | 2022 , 171 | International Journal of Thermal Sciences
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Thermal insulation materials are widely used in the fields of thermal protection and the energy conservation at high temperature. Thermal conductivity is one of the most important parameters of characterizing the thermal insulation performance of thermal protection materials. Steady state method such as the guarded hot plate method is normally considered as the most accurate method to measure the thermal conductivity of thermal insulation materials, but the temperature range is limited to below 1000 K. Unsteady state method can be employed at higher temperature but the accuracy is lacking of validation. Consequently, thermal verification experiments are usually conducted by heating the front surface of thermal insulation materials to a very high temperature. However, it is difficult to obtain the temperature-dependent thermal conductivity by using the thermal insulation performance measured with a large temperature difference across the material. In this study, a sandwich structure experimental system is built to carry out the thermal insulation performance tests with a large temperature difference at both steady state and transient state. Both uniform temperature layer method and polynomial fitting method are adopted to extract the temperature-dependent thermal conductivity from the large temperature difference test at steady state. A new transient state identification method is proposed based on the niche genetic algorithm to identify the relation between thermal conductivity and temperature from the transient thermal response. The temperature-dependent thermal conductivity of four thermal protection materials are finally obtained. The identification results prove that the proposed transient identification method is reliable and robust. © 2021 Elsevier Masson SAS

Keyword :

Thermal insulating materials Thermal conductivity Genetic algorithms Thermal insulation

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GB/T 7714 Zhang, Hu , Shang, Chenyang , Tang, Guihua . Measurement and identification of temperature-dependent thermal conductivity for thermal insulation materials under large temperature difference [J]. | International Journal of Thermal Sciences , 2022 , 171 .
MLA Zhang, Hu et al. "Measurement and identification of temperature-dependent thermal conductivity for thermal insulation materials under large temperature difference" . | International Journal of Thermal Sciences 171 (2022) .
APA Zhang, Hu , Shang, Chenyang , Tang, Guihua . Measurement and identification of temperature-dependent thermal conductivity for thermal insulation materials under large temperature difference . | International Journal of Thermal Sciences , 2022 , 171 .
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Thermal-hydraulic-structural evaluation of S-CO2 cooling wall tubes: A thermal stress evaluating criterion and optimization EI SCIE
期刊论文 | 2021 , 170 | INTERNATIONAL JOURNAL OF THERMAL SCIENCES
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The S-CO2 Brayton cycle has been considered as a promising alternative in coal-fired power plants due to its high efficiency and high compactness. However, the high inlet temperature and low heat transfer coefficient of S-CO2 in the cooling wall tubes arranged in the furnace could lead to thermal fragile in practical operation. In present study, thermal-hydraulic-structural evaluation on S-CO2 cooling wall tubes is investigated. Firstly, it is found that the stress distribution is mainly dominated by the circumferential temperature gradient. Secondly, a new criterion, the thermal deviation factor (TDF), is proposed to evaluate the tube thermal stress. It indicates the plastic deformation if exceeding the critical value of TDF = 1, which is more efficient than conventional structural analysis. Thirdly, based on the TDF, two typical methods of inserting twisted tapes and unilaterally arranging dimples inside the tube are proposed to reduce the thermal stress. A novel configuration of elliptic dimple with rounded corners is finally proposed to reduce the local stress concentration efficiently. The results show that the elliptic dimples have the highest comprehensive performance, which is recommended as the heat transfer enhancement structures in S-CO2 cooling wall tubes.

Keyword :

Thermal-hydraulic-structural evaluation Supercritical carbon dioxide Thermal deviation factor Cooling wall tube Heat transfer enhancement

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GB/T 7714 Li, X. L. , Tang, G. H. , Yang, D. L. et al. Thermal-hydraulic-structural evaluation of S-CO2 cooling wall tubes: A thermal stress evaluating criterion and optimization [J]. | INTERNATIONAL JOURNAL OF THERMAL SCIENCES , 2021 , 170 .
MLA Li, X. L. et al. "Thermal-hydraulic-structural evaluation of S-CO2 cooling wall tubes: A thermal stress evaluating criterion and optimization" . | INTERNATIONAL JOURNAL OF THERMAL SCIENCES 170 (2021) .
APA Li, X. L. , Tang, G. H. , Yang, D. L. , Fan, Y. H. , Xu, J. L. . Thermal-hydraulic-structural evaluation of S-CO2 cooling wall tubes: A thermal stress evaluating criterion and optimization . | INTERNATIONAL JOURNAL OF THERMAL SCIENCES , 2021 , 170 .
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Hydrostatic Pressure Tuning of Thermal Conductivity for PbTe and PbSe Considering Pressure-Induced Phase Transitions SCIE PubMed
期刊论文 | 2021 , 6 (5) , 3980-3990 | ACS OMEGA
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Flexibly modulating thermal conductivity is of great significance to improve the application potential of materials. PbTe and PbSe are promising thermoelectric materials with pressure-induced phase transitions. Herein, the lattice thermal conductivities of PbTe and PbSe are investigated as a function of hydrostatic pressure by first-principles calculations. The thermal conductivities of both PbTe and PbSe in NaCl phase and Pnma phase exhibit complex pressure-dependence, which is mainly ascribed to the nonmonotonic variation of a phonon lifetime. In addition, the thermal transport properties of the Pnma phase behave anisotropically. The thermal conductivity of Pnma-PbTe is reduced below 1.1 W/m.K along the c-axis direction at 7-12 GPa. The mean free path for 50% cumulative thermal conductivity increases from 7 nm for NaCl-PbSe at 0 GPa to 47 nm for the Pnma-PbSe in the a-axis direction at 7 GPa, making it convenient for further thermal conductivity reduction by nanostructuring. The thermal conductivities of Pnma-PbTe in the c-axis direction and Pnma-PbSe in the a-axis direction are extremely low and hypersensitive to the nanostructure, showing important potential in thermoelectric applications. This work provides a comprehensive understanding of phonon behaviors to tune the thermal conductivity of PbTe and PbSe by hydrostatic pressure.

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GB/T 7714 Zhang, Min , Tang, Guihua , Li, Yifei . Hydrostatic Pressure Tuning of Thermal Conductivity for PbTe and PbSe Considering Pressure-Induced Phase Transitions [J]. | ACS OMEGA , 2021 , 6 (5) : 3980-3990 .
MLA Zhang, Min et al. "Hydrostatic Pressure Tuning of Thermal Conductivity for PbTe and PbSe Considering Pressure-Induced Phase Transitions" . | ACS OMEGA 6 . 5 (2021) : 3980-3990 .
APA Zhang, Min , Tang, Guihua , Li, Yifei . Hydrostatic Pressure Tuning of Thermal Conductivity for PbTe and PbSe Considering Pressure-Induced Phase Transitions . | ACS OMEGA , 2021 , 6 (5) , 3980-3990 .
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Influence of Participating Radiation on Measuring Thermal Conductivity of Translucent Thermal Insulation Materials with Hot Strip Method SCIE CSCD
期刊论文 | 2021 | JOURNAL OF THERMAL SCIENCE
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Abstract :

The hot strip method, as one typical transient method, is widely used to measure the effective thermal conductivity of thermal insulation materials at various temperatures. Since the test theory is based on solving the energy equation via heat conduction, the test result will be questionable when measuring thermal insulation materials, such as silica aerogel and photovoltaic glazing, in which the participating thermal radiation is a dominant heat transfer mode at high temperature. In this study, numerical investigation is employed to reveal the measurement reliability of hot strip method when applied to translucent thermal insulation materials. By reproducing the dynamic conduction-radiation coupled heat transfer process within the translucent materials numerically, the effective thermal conductivity of translucent materials with varying extinction coefficients are obtained at various temperatures. Comparisons are made for the effective thermal conductivity of translucent materials determined by the hot strip method, one-dimensional steady state method, transient plane source method and Rosseland model. Large discrepancies are found among the effective thermal conductivity determined by different methods for translucent materials with low extinction coefficient. The thermal conductivity obtained from the hot strip method is overestimated at elevated temperature when compared with that from one-dimensional steady state method. In order to measure the effective thermal conductivity of translucent materials accurately, the effect of thermal radiation should be considered for different transient methods.

Keyword :

hot strip method thermal radiation translucent materials thermal conductivity

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GB/T 7714 Zhang Hu , Wu Kefan , Tang Guihua . Influence of Participating Radiation on Measuring Thermal Conductivity of Translucent Thermal Insulation Materials with Hot Strip Method [J]. | JOURNAL OF THERMAL SCIENCE , 2021 .
MLA Zhang Hu et al. "Influence of Participating Radiation on Measuring Thermal Conductivity of Translucent Thermal Insulation Materials with Hot Strip Method" . | JOURNAL OF THERMAL SCIENCE (2021) .
APA Zhang Hu , Wu Kefan , Tang Guihua . Influence of Participating Radiation on Measuring Thermal Conductivity of Translucent Thermal Insulation Materials with Hot Strip Method . | JOURNAL OF THERMAL SCIENCE , 2021 .
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超滑表面防冰与疏冰机理研究 EI CSCD
期刊论文 | 2021 , 55 (8) , 111-118 | 西安交通大学学报
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为解决高湿度条件下超疏水表面防冰失效问题,提出了一种新型多孔超滑表面.基于自组装技术,提出新型超滑表面(HPO-SLIP)涂层表面制备方法,即通过构建超疏水粗糙多孔基底进而涂覆润滑油制备获得超滑表面,并对其润湿特性和微观形貌进行表征,最后对其防冰与疏冰特性进行实验研究.实验结果表明:与超疏水表面相比,超滑表面冷凝液滴孤立冻结,无"冰桥"扩展,结冰扩散速度慢;超滑表面与冷凝冻结液滴接触属于固-油-固接触模型,油膜动态迁移分布影响成核结冰;对于疏冰特性,超滑表面冰黏附剪切强度比亲水表面低一个数量级.综合分析发现,与亲水表面、超疏水纳米草表面、超疏水微纳复合表面相比,超滑表面具有最优的防冰传播特性与疏冰性能,可以有效减少冰积累量.

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GB/T 7714 蒋静 , 唐桂华 . 超滑表面防冰与疏冰机理研究 [J]. | 西安交通大学学报 , 2021 , 55 (8) : 111-118 .
MLA 蒋静 et al. "超滑表面防冰与疏冰机理研究" . | 西安交通大学学报 55 . 8 (2021) : 111-118 .
APA 蒋静 , 唐桂华 . 超滑表面防冰与疏冰机理研究 . | 西安交通大学学报 , 2021 , 55 (8) , 111-118 .
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双轴应变对MoS2/WS2异质结热电性能的影响 CSCD
期刊论文 | 2021 , 42 (9) , 2455-2460 | 工程热物理学报
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低维化是提高材料热屯性能的有效方法.本文采用基于密度泛函理论的第一性原理和形变势理论,研究了MoS2/WS2异质结的能带结构和热电性能.研究结果表明异质结具有1.10 eV的间接带隙,且堆叠方式对异质结的能带结构影响较小.双轴应变可以起到能带调控的作用,并进一步影响塞贝克系数和电导率.n型和p型掺杂体系的功率因子分别在1%和3%的压缩应变情况下得到显著提高.研究证实了施加双轴应变是提高异质结热电性能的有效方法.

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GB/T 7714 赵欣 , 唐桂华 , 李一斐 et al. 双轴应变对MoS2/WS2异质结热电性能的影响 [J]. | 工程热物理学报 , 2021 , 42 (9) : 2455-2460 .
MLA 赵欣 et al. "双轴应变对MoS2/WS2异质结热电性能的影响" . | 工程热物理学报 42 . 9 (2021) : 2455-2460 .
APA 赵欣 , 唐桂华 , 李一斐 , 张敏 . 双轴应变对MoS2/WS2异质结热电性能的影响 . | 工程热物理学报 , 2021 , 42 (9) , 2455-2460 .
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成形温度对镁合金温热渐进成形微观组织及断口形貌的影响 CSCD
期刊论文 | 2021 , 28 (3) , 84-91 | 塑性工程学报
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Abstract :

提出一种油浴加热辅助温热渐进成形技术,利用相关装置,通过实验的方法研究了成形温度对AZ31B镁合金成形性能、微观组织及断口形貌的主要影响并分析了原因.结果表明,AZ31B镁合金板材的成形温度越高,其最大成形角度越大,当成形温度达到200℃时,发生部分再结晶,导致晶粒细化,达到250℃时已经完全再结晶,晶粒显著细化,最大成形角度达到60°.但是过高的成形温度将增加能量消耗并提高AZ31B镁合金的氧化程度,并不是最经济的选择.在当前实验条件下,250℃左右的油浴加热温度是AZ31B镁合金比较理想的成形温度,非基面滑移系基本开动并参与材料的塑性变形,使AZ31B镁合金板材的成形性能得到显著改善.

Keyword :

油浴加热 断口形貌 AZ31B镁合金 成形温度 微观组织 温热渐进成形

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GB/T 7714 张三 , 唐桂华 , 沈建冬 et al. 成形温度对镁合金温热渐进成形微观组织及断口形貌的影响 [J]. | 塑性工程学报 , 2021 , 28 (3) : 84-91 .
MLA 张三 et al. "成形温度对镁合金温热渐进成形微观组织及断口形貌的影响" . | 塑性工程学报 28 . 3 (2021) : 84-91 .
APA 张三 , 唐桂华 , 沈建冬 , 李朕 , 江祥奎 . 成形温度对镁合金温热渐进成形微观组织及断口形貌的影响 . | 塑性工程学报 , 2021 , 28 (3) , 84-91 .
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Biaxial Strain Effect on Thermoelectric Properties of MoS2/WS2 Heterostructure EI
期刊论文 | 2021 , 42 (9) , 2455-2460 | Journal of Engineering Thermophysics
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Low dimension is an effective way to improve the thermoelectric properties of materials. In this paper, the first principle based on density functional theory and deformation potential theory are employed to study the band structure and thermoelectric properties of MoS2/WS2 heterostructure. The results show that the heterostructure has an indirect band gap of 1.10 eV, and the stacking modes have little effect on the band structure of the heterostructure. Biaxial strain can tune the band structure and further affect the Seebeck coefficient and conductivity. The power factors of n-type and p-type doping systems are significantly increased under the compressive strain of 1% and 3%, respectively. This work indicates that biaxial strain is an effective method to improve the thermoelectric properties of heterostructure. © 2021, Science Press. All right reserved.

Keyword :

Thermoelectric equipment Energy gap Molybdenum compounds Thermoelectricity Layered semiconductors Density functional theory

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GB/T 7714 Zhao, Xin , Tang, Gui-Hua , Li, Yi-Fei et al. Biaxial Strain Effect on Thermoelectric Properties of MoS2/WS2 Heterostructure [J]. | Journal of Engineering Thermophysics , 2021 , 42 (9) : 2455-2460 .
MLA Zhao, Xin et al. "Biaxial Strain Effect on Thermoelectric Properties of MoS2/WS2 Heterostructure" . | Journal of Engineering Thermophysics 42 . 9 (2021) : 2455-2460 .
APA Zhao, Xin , Tang, Gui-Hua , Li, Yi-Fei , Zhang, Min . Biaxial Strain Effect on Thermoelectric Properties of MoS2/WS2 Heterostructure . | Journal of Engineering Thermophysics , 2021 , 42 (9) , 2455-2460 .
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Anisotropic Thermal Conductivity of Carbon-fiber/epoxy Composites EI
期刊论文 | 2021 , 42 (5) , 1282-1287 | Journal of Engineering Thermophysics
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In this paper, the anisotropic heat transfer property of carbon-fiber/epoxy plain woven and twill woven composites is studied experimentally and numerically. In the experiment aspect, the steady-state 'sandwich' structure based on the electric heating film is used to measure the out-of-plane and in-plane thermal conductivity at different temperature. In terms of simulation, a representative unit cell is established according to observation of the interior micro-structure of composite, and then anisotropic thermal conductivity along different principal axis can be obtained by simulating the 1D steady-state heat transfer process within the model in the three-dimensional direction, respectively. The results show that both the out-of-plane and in-plane thermal conductivity of carbon-fiber/epoxy composites increase linearly with the hot surface temperature of composites, and the in-plane thermal conductivity is approximate 2.8 times as high as the out-of-plane thermal conductivity. The thermal conductivity deviation between the plain woven and twill woven composites along different main axis is less than 10% due to the similar density. The numerical prediction result agrees with the experimental result and the sources of leading to the deviations are also discussed. © 2021, Science Press. All right reserved.

Keyword :

Composite materials Composite structures Anisotropy Heat transfer Graphite fibers Thermal conductivity of solids

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GB/T 7714 Wu, Ke-Fan , Nuanyai, Pontarit , Zhang, Hu et al. Anisotropic Thermal Conductivity of Carbon-fiber/epoxy Composites [J]. | Journal of Engineering Thermophysics , 2021 , 42 (5) : 1282-1287 .
MLA Wu, Ke-Fan et al. "Anisotropic Thermal Conductivity of Carbon-fiber/epoxy Composites" . | Journal of Engineering Thermophysics 42 . 5 (2021) : 1282-1287 .
APA Wu, Ke-Fan , Nuanyai, Pontarit , Zhang, Hu , Tang, Gui-Hua . Anisotropic Thermal Conductivity of Carbon-fiber/epoxy Composites . | Journal of Engineering Thermophysics , 2021 , 42 (5) , 1282-1287 .
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