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Chu J.-C.,Chung Yuan Christian University | Teng J.-T.,Chung Yuan Christian University | Xu T.-T.,Chung Yuan Christian University | Xu T.-T.,Huazhong University of Science and Technology | And 8 more authors.
Experimental Thermal and Fluid Science | Year: 2012

This paper experimentally investigated the behavior of water through curved rectangular microchannels with different aspect ratios and curvature radii for Re numbers ranging from 10 to 600. The experimental data were compared with the results obtained from numerical analyses and the available correlations. The experimental results indicated that classical Navier-Stokes equations were applicable for the incompressible laminar flow passing through curved microchannels. Geometrical parameters, such as aspect ratio and curvature ratio, were found to have important effects on fluid flowing through curved rectangular microchannels. © 2011 Elsevier Inc. Source


Liu C.,Huazhong University of Science and Technology | Liu C.,Chung Yuan Christian University | Teng J.-T.,Chung Yuan Christian University | Chu J.-C.,Chung Yuan Christian University | And 6 more authors.
International Journal of Heat and Mass Transfer | Year: 2011

The behaviors of improved Heat transfer and the associated higher pressure drop for liquid flow in rectangular micochannels with longitudinal vortex generators (LVGs) were determined experimentally for the Reynolds numbers of 170-1200 with hydraulic diameter of 187.5 μm and aspect ratio of 0.067 for LVGs with different number of pairs and angles of attack. It was found that the range of critical Reynolds numbers (600-730) were at a much smaller value by adding LVGs than the one without (Re ∼ 2300); heat transfer performance was improved (9-21% higher for those with laminar flow and 39-90% for those with turbulent flow), while encountering larger pressure drop (34-83% for laminar flow and 61-169% for turbulent flow). Empirical correlations for these two parameters were then obtained by curve-fittings for a variety of rectangular microchannels under study. © 2010 Elsevier B.V. All rights reserved. Source

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