Viscous heating for laminar liquid flow in microtubes |
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Authors: | Zhigang Liu Shiqiang Liang Chengwu Zhang Ning Guan |
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Affiliation: | Zhigang LIU1,Shiqiang LIANG2,Chengwu ZHANG 1 and Ning GUAN1 1. Energy Research Institute of Shandong Academy of Sciences,Jinan 250014,China 2. Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100190,China Zhigang LIU:Assistant Professor |
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Abstract: | Using de-ionized ultra-filtered water (DIUFW) as the working fluid, the effects of viscous dissipation in microtubes with
inner diameters of 19.9μm and 44.2μm, respectively, have been studied by experiments, the theoretical analysis and the numerical
simulation at laminar state. Based on thermal imaging technology of micro-area, the temperature rise resulted from the viscous
dissipation in microtube is measured by employing IR camera with a specially magnifying lens at different Reynolds numbers.
A 2-D model adapted to microtube is presented to simulate the viscous dissipation characteristic considering electric double
layer effect (EDL). The investigation shows the calculating results are in rough agreement with the experimental data if removing
the experimental uncertainties. Based on the experimental and the numerical simulation results, a viscous dissipation number
which can describe the law of the viscous heating in microtube is summed up and it explains the abnormity of the flow resistance
in microtubes. |
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Keywords: | viscous dissipation microtube IR camera numerical simulation electric double layer effect |
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