...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Heat Transfer >Performance of Aluminum and Carbon Foams for Air Side Heat Transfer Augmentation
【24h】

Performance of Aluminum and Carbon Foams for Air Side Heat Transfer Augmentation

机译：铝和碳泡沫在空气侧传热增强中的性能

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The air side heat transfer performance of three aluminum foam samples and three modi-fied carbon foam samples are examined for comparison with multilouvered fins often found in compact heat exchangers. The aluminum foam samples have a bulk density of 216 kg/m~3 with pore sizes of 0.5, 1, and 2 mm. The modified carbon foam samples have bulk densities of 284, 317, and 400 kg/m~3 and machined flow passages of 3.2 mm in diameter. The samples were placed in a forced convection arrangement using a foil heater as the heat source and ambient air as the sink. A constant heat flux of 9.77 kW/m~2 is applied throughout the experiments with the mean air velocity ranging from 1 to 6 m/s as the control parameter. The steady volume-averaged momentum equation and a two-equation nonequilibrium heat transfer model are employed to extract the volumetric heat transfer coefficients. Pressure drop measurements are correlated with the Darcy-Forcheimer relation. Empirical heat transfer correlations for the aluminum and carbon foam samples are provided. Using a hypothetical heat exchanger considering only the thermal resistance between the ambient air and the outer tube wall, the air side perfor-mance for each sample is modeled based on the local heat transfer coefficients and friction factors obtained from experiments. The performance of each sample is evaluated based on a coefficient of performance (COP, defined as the ratio of the total heat removed to the electrical input of the blower), compactness factor (CF, defined as the total heat removed per unit volume), and power density (PD, defined as the total heat removed per unit mass). Results show the carbon foam samples provide significant improvement in CF but the COP and PD are considerably lower than that for comparable multilouvered fin heat exchangers.
机译：检查了三个铝泡沫样品和三个改性碳泡沫样品在空气侧的传热性能，以便与紧凑型热交换器中常见的百叶窗式翅片进行比较。泡沫铝样品的堆积密度为216 kg / m〜3，孔径为0.5、1、2 mm。改性碳泡沫样品的堆积密度为284、317和400 kg / m〜3，直径为3.2 mm的机加工流道。使用箔加热器作为热源，环境空气作为水槽，将样品置于强制对流状态。在整个实验过程中，恒定的热通量为9.77 kW / m〜2，平均风速范围为1至6 m / s。采用稳态体积平均动量方程和两方程非平衡传热模型提取体积传热系数。压降测量值与Darcy-Forcheimer关系相关。提供了铝泡沫和碳泡沫样品的经验传热相关性。使用仅考虑环境空气和外管壁之间的热阻的假想热交换器，基于局部传热系数和从实验中获得的摩擦系数，对每个样品的空气侧性能进行建模。根据性能系数（COP，定义为排出的总热量与风机电输入的比值），密实度系数（CF，定义为每单位体积排出的总热量）评估每个样品的性能，和功率密度（PD，定义为每单位质量去除的总热量）。结果表明，碳泡沫样品可显着改善CF，但COP和PD明显低于同类多百叶窗翅片换热器。

著录项

  • 来源
    《Journal of Heat Transfer》 |2010年第12期|p.121901.1-121901.9|共9页
  • 作者

    Patrick T. Garrity; James F. Klausner; Renwei Mei;

  • 作者单位

    Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611;

    rnDepartment of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611;

    rnDepartment of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611;

  • 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

    porous foam; heat transfer augmentation; heat exchanger performance;

    机译：多孔泡沫传热增强换热器性能;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号