Influence of entrance effect of CC plate channel on thermal and hydraulic characteristic

doi:10.11949/j.issn.0438-1157.20170090

Abstract

Abstract:

The influence of entrance effect on thermal and hydraulic characteristics for CC plate channel was numerically studied by adopting the lower Reynolds k-ε turbulence flow model. The simulation results indicated that the entrance effect significantly enhanced turbulent intensity at the first three unitary cells and the influence of entrance effect on heat transfer could be neglected after the fourth unitary cell. Because the increase of turbulent intensity in the inlets reduces with increasing Reynolds number, the heat transfer enhancement could be depressed. As the Reynolds number increases, the friction coefficients of entrance and fully developed section both decrease. In addition, the friction coefficient of inlet section is approximately 20% higher than that of fully developed section.

Key words: CC plate, entrance effect, heat transfer, numerical simulation, turbulence intensity, friction coefficient

摘要：

选取低Reynolds数k-ε湍流模型，采用数值模拟的方法计算了不同Reynolds数下入口效应和CC板通道单元体传热特性、阻力特性的关系。数值模拟的结果表明：入口效应的存在使得CC板通道前3个单元体的湍流强度显著变大，在第4个单元体之后入口效应对传热特性的影响可以忽略；随着Reynolds数的增加，由于CC板通道入口处湍流强度增加的程度逐渐变小，入口效应对传热效果的强化能力下降；随着Reynolds数的增加，入口段和充分发展段的摩擦阻力系数均有所下降；此外，由于入口效应的存在，CC板通道入口段的摩擦阻力系数比充分发展段高20%左右。

关键词: CC板通道, 入口效应, 传热, 数值模拟, 湍流强度, 摩擦阻力系数

CLC Number:

TK02

WEI Xiaoyang, WANG Limin, DENG Lei, CHE Defu. Influence of entrance effect of CC plate channel on thermal and hydraulic characteristic[J]. CIESC Journal, 2017, 68(11): 4061-4068.

魏晓阳, 王利民, 邓磊, 车得福. CC板通道入口效应对传热特性和阻力特性的影响[J]. 化工学报, 2017, 68(11): 4061-4068.

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