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首页> 外文期刊>International Journal of Heat and Mass Transfer >Forced convection in additively manufactured sandwich-walled cylinders with thermo-mechanical multifunctionality
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Forced convection in additively manufactured sandwich-walled cylinders with thermo-mechanical multifunctionality

机译：具有热力机械功能的增材制造的夹层圆筒中的强制对流

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摘要

Forced convective heat transfer in lightweight sandwich-walled cylinders with quadrangle core (I type) and triangle cores (V, N, W and M type) was investigated experimentally, numerically and theoretically, targeting multifunctional applications (e.g., combustion chamber) requiring simultaneous load bearing and heat dissipation. Sandwich-walled cylinder with the N type core was fabricated using 3D-printing technology. Forced convection experiments were carried out to validate numerical simulation results and to reveal varying flow stages in the channels of the sandwich wall. Flow in these channels changed from laminar (Re < 2200), transition (2200 < Re < 4100) to vigorous turbulence stage (Re > 4100) as the Reynolds number was increased. With the total heat dissipation area fixed, the heat transfer performance of the quadrilateral core (I type) was better than triangular cores (V, N, W and M type). Among the triangular cores, those with homogeneous pore structure (V and N) exhibited superior heat transfer performance in comparison with the nonhomogeneous ones (W and M type). The optimal number of unit cells for each core type was determined using the theory of intersection-of-asymptotes. With the unit cell number optimized for each core, the I core exhibited the best heat dissipation performance while the M core had the worst. Under structural loading, however, the buckling resistance of the 1 core was not as good as the triangular ones. Thermal and mechanical synergy must be considered in the selection of sandwich core topology for multifunctional applications.
机译：针对具有同时负载的多功能应用（例如燃烧室），通过实验，数值和理论研究了具有四角形铁心（I型）和三角形铁心（V，N，W和M型）的轻质夹心式气缸中的强制对流换热。轴承和散热。使用3D打印技术制造了带有N型芯的夹心式圆筒。进行了强制对流实验，以验证数值模拟结果并揭示夹心壁通道中不同的流动阶段。随着雷诺数的增加，这些通道中的流量从层流（Re <2200）转变为过渡（2200 4100）。在总散热面积固定的情况下，四边形磁芯（I型）的传热性能优于三角形磁芯（V，N，W和M型）。在三角形芯中，具有均匀孔结构（V和N）的芯比非均匀芯（W和M型）具有更好的传热性能。使用渐近线交会理论确定每种核心类型的最佳晶胞数量。在针对每个内核优化了单位电池数量的情况下，I内核表现出最佳的散热性能，而M内核表现最差。然而，在结构载荷下，第1芯的抗屈曲性不如三角形。在为多功能应用选择夹芯拓扑时，必须考虑热和机械协同作用。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2020年第3期|119161.1-119161.15|共15页
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  • 作者单位

    State Key Laboratory for Strength and Vibration of Mechanical Structures Xi'an Jiaotong University Xi'an 710049 PR China State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics Nanjing 210016 PR China Bioinspired Engineering and Biomechanics Center (BEBC) Xi'an jiaotong University Xi'an 710049 PR China;

    Bioinspired Engineering and Biomechanics Center (BEBC) Xi'an jiaotong University Xi'an 710049 PR China The Key Laboratory of Biomedical Information Engineering of Ministry of Education School of Life Science and Technology Xi'an jiaotong University Xi'an 710049 PR China;

    State Key Laboratory for Strength and Vibration of Mechanical Structures Xi'an Jiaotong University Xi'an 710049 PR China;

    State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics Nanjing 210016 PR China Nanjing Center for Multifunctional Lightweight Materials and Structures (MLMS) Nanjing University of Aeronautics and Astronautics Nanjing 210016 PR China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Intersection-of-asymptotes theory; 3D printing; Forced convection; Sandwich structure; Combustor;

    机译：渐近线相交理论;3D打印强制对流;三明治结构;燃烧室;

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