Heat/mass transfer characteristics for flow in a corrugated wall channel.
Heat/mass transfer characteristics for flow in a corrugated wall channel.
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DOI：
10.1115/1.3450667
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发表时间：
1977-05
期刊：
影响因子：
--
通讯作者：
L. Goldstein;E. Sparrow
中科院分区：
文献类型：
--
作者：
L. Goldstein;E. Sparrow
进行了基于萘升华技术的实验，以确定波纹壁通道中流动的局部和平均传递特性。实验范围涵盖层流、过渡和低雷诺数湍流状态。在翼展方向（即横流方向）和流向方向上进行局部传质测量，并且还确定了总体传质速率。实验证明了多种复杂传递过程和相关流体流动现象的存在。这些包括二次流和相关的翼展方向的质量传递变化、通过抵消离心力抑制二次流、以及通过湍流的发生对二次流的破坏。波纹壁背风面上的流动分离导致局部传输率急剧下降，但在重新附着区域明显存在相对较高的传输率。在层流范围内，波纹壁通道的平均传递系数仅略大于平行板通道的平均传递系数。另一方面，在低雷诺数湍流状态下，与光滑壁通道相比，壁波纹导致平均系数增加近三倍。
Experiments based on the naphthalene sublimation technique were carried out to determine the local and average transfer characteristics for flow in a corrugated wall channel. The range of the experiments encompassed the laminar, transition, and low-Reynolds-number turbulent regimes. Local mass transfer measurements were made both in the spanwise (i.e., cross stream) and streamwise directions, and overall transfer rates were also determined. The experiments demonstrated the existence of a variety of complex transfer processes and related fluid flow phenomena. These included secondary flows and associated spanwise mass transfer variations, suppression of the secondary flow by counteracting centrifugal forces, and destruction of the secondary flow by the onset of turbulence. Flow separation on the leeward facets of the corrugated wall caused a sharp decrease in the local transfer rates, but relatively high transfer rates were in evidence in the reattachment region. In the laminar range, the average transfer coefficients for the corrugated wall channel were only moderately larger than those for a parallel-plate channel. On the other hand, in the low-Reynolds-number turbulent regime, the wall corrugations were responsible for an increase of nearly a factor of three in the average coefficient compared with the smooth wall channel.