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Thermal-Hydraulic Optimization of Open-Cell Metallic Foams Used as Extended Surfaces

机译：用作伸展表面的开放式金属泡沫的热液压优化

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摘要

A one-dimensional analytical validated model for predicting temperature distribution, heat transfer, pressure drop, and fluid pumping power in an open-cell metal foam (OCMF)fin is developed. A foam length optimization technique based on its performance factor (PF) is proposed. Every optimized foam's efficiency is shown to be 33.2%, regardless of its pores per inch (PPf) or porosity. Although it can be applied to other porous materials, the model has been illustrated for aluminum foams with 5-40 PPI and 0.88-0.96 porosity (ε). The highest PPI, lowest porosity foam gives the best unit area goodness factor Φ_u = j_H/f, heat transfer, and heat transfer per unit volume Q_v, while the greatest goodness factor Φ (heat transfer rate to fluid pumping power) is achieved by the lowest PPI, lowest porosity foam. The highest PPI, highest porosity foam yields the best heat transfer per unit mass Q_M. Thus, optimum foam selections strongly depend on the application. An often-used fin optimization criterion recommends that the fin effectiveness should equal or exceed 2. This study shows that the effectiveness of any optimized foam always exceeds 2. However, the converse, i.e., requiring the foam effectiveness to at least equal 2, does not guarantee an optimal foam, which implies that the PF-based optimization criterion is an inclusive one. It is also proved that a previously suggested optimization criterion of maximizing a foam's geometric mean efficiency will result in a suboptimal foam design.
机译：开发了一种用于预测温度分布，传热，压降和开孔金属泡沫（OCMF）翅片中的温度分布，传热，压降和流体泵送功率的一维分析验证模型。提出了一种基于其性能因子（PF）的泡沫长度优化技术。无论其每英寸孔（PPF）或孔隙率如何，每次优化泡沫的效率都显示为33.2％。虽然它可以应用于其他多孔材料，但已经针对具有5-40ppi和0.88-0.96孔隙率（ε）的铝泡沫来说明该模型。最高的PPI，最低孔隙度泡沫给出了最佳单位面积良性因子φ_U= J_H / F，传热和每单位体积的传热Q_V，而最大的善变因子φ（传热速率与流体泵送电源）实现的最低PPI，最低孔隙度泡沫。最高PPI，最高孔隙率泡沫产生每单位质量Q_M的最佳热传递。因此，最佳的泡沫选择强烈取决于应用。通常使用的鳍优化标准建议鳍效力应等于或超过2.本研究表明，任何优化的泡沫的有效性总是超过2.然而，逆转，即要求泡沫效率至少相等2，确实如此不保证最佳泡沫，这意味着基于PF的优化标准是包容性的。还证实，先前建议的优化标准最大化泡沫的几何平均效率将导致次优泡沫设计。

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  • 来源
    《Journal of Heat Transfer》 |2021年第7期|072701.1-072701.11|共11页
  • 作者

    Sunil Mehendale;

  • 作者单位

    Manufacturing and Mechanical Engineering Technology Michigan Technological University Houghton Ml 49931;

  • 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
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