@Article{cmes.2020.08989,
AUTHOR = {Hui Lu, Xinyue Duan, Minghai Xu, Liang Gong, Bin Ding},
TITLE = {A New Method of Roughness Construction and Analysis of Construct Parameters},
JOURNAL = {Computer Modeling in Engineering \& Sciences},
VOLUME = {123},
YEAR = {2020},
NUMBER = {3},
PAGES = {1193--1204},
URL = {http://www.techscience.com/CMES/v123n3/39311},
ISSN = {1526-1506},
ABSTRACT = {In micro-manufacturing, roughness is unavoidable due to the tolerance
of micro-machining methods. Roughness in microchannel could have a significant
influence on flow and heat transfer since the size of microchannel is very small. In
our work, roughness is modeled as a superposition of waves. A simple Fourier
series method is proposed to construct the rough surface. With this method,
roughness is constructed on the bottom of the rectangular microchannel which
has a hydraulic diameter of 0.5 mm. Two important parameters during roughness
construction, triangulate size and correlation length are studied under the same
relative roughness 1%. Results show that flow and heat transfer characteristics
are not sensitive to triangulate size. While triangulate size is changing from
0.1 mm to 0.05 mm, the variations of pressure drop and average Nusselt number
are less than 1%. Correlation length could influence the topography of roughness
surface a lot, smaller correlation length will lead to more pressure drop and lower
Nusselt number.},
DOI = {10.32604/cmes.2020.08989}
}