Roughness Effects on Flow and Heat Transfer for Additively Manufactured Channels
Roughness Effects on Flow and Heat Transfer for Additively Manufactured Channels
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DOI：
10.1115/gt2015-43940
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发表时间：
2015-06
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影响因子：
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通讯作者：
Curtis K. Stimpson;Jacob C. Snyder;K. Thole;Dominic Mongillo
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文献类型：
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作者：
Curtis K. Stimpson;Jacob C. Snyder;K. Thole;Dominic Mongillo
添加制造(AM)领域的最新技术进步，特别是直接金属激光烧结(DMLS)，增加了用添加制造(AM)制造燃气轮机部件的潜力将DMLS用于涡轮部件拓宽了设计空间，并允许在几乎不增加时间或成本的情况下制造越来越小和复杂的几何形状。当试图评估DMLS在特定应用中的优势时，尤其是因为人们对表面粗糙度的影响知之甚少，因此出现了挑战。本文介绍了为更好地理解粗糙度而使用DMLS制造的小型AS生产通道的流动的压降和换热结果。在这项研究中，用DMLS制作的10种不同的具有多个矩形通道的优惠券进行了评估。在不同的流动条件下收集了测量数据，并将其简化为摩擦因数和努塞尔数。结果表明，与光滑流道相比，这些参数有了显著的提高，特别是对于水力直径较小的小流道而言，摩擦因数的增加尤为明显。然而，Nusselt数的增加并不随摩擦因数的增加而成比例增加。版权所有©2015，由ASME
Recent technological advances in the field of additive manufacturing (AM), particularly with direct metal laser sintering (DMLS), have increased the potential for building gas turbine components with AM. Using DMLS for turbine components broadens the design space and allows for increasingly small and complex geometries to be fabricated with little increase in time or cost. Challenges arise when attempting to evaluate the advantages of DMLS for specific applications, particularly because of how little is known regarding the effects of surface roughness. This paper presents pressure drop and heat transfer results of flow through small, as produced channels that have been manufactured using DMLS in an effort to better understand roughness. Ten different coupons made with DMLS all having multiple rectangular channels were evaluated in this study. Measurements were collected at various flow conditions and reduced to a friction factor and a Nusselt number. Results showed significant augmentation of these parameters compared to smooth channels, particularly with the friction factor for mini-channels with small hydraulic diameters. However, augmentation of Nusselt number did not increase proportionally with the augmentation of the friction factor.Copyright © 2015 by ASME