Journal ArticleDOI
Flow characteristics of water in microtubes
Gh. Mohiuddin Mala,Dongqing Li +1 more
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TLDR
In this paper, a roughness-viscosity model was proposed to interpret the experimental data and the results indicated significant departure of flow characteristics from the predictions of the conventional theory for microtubes with smaller diameters.About:
This article is published in International Journal of Heat and Fluid Flow.The article was published on 1999-04-01. It has received 711 citations till now. The article focuses on the topics: Water flow & Pressure drop.read more
Citations
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Fast and accurate measurement of diffusion coefficient by Taylor’s dispersion analysis
Min Zou,Yanli Han,Li Qi,Yi Chen +3 more
TL;DR: In this article, the performance of Taylor's dispersion analysis for the fast and accurate measurement of diffusion coefficient of a minute solute in various solvents was investigated by monitoring the UV absorption peak of a solute pulse and calculating the diffusion coefficient by peak efficiency.
Journal ArticleDOI
Enhancement of stirring in a straight channel at Low Reynolds-numbers with various block-arrangement
Hyeung Seok Heo,Yong Kweon Suh +1 more
TL;DR: In this paper, a newly designed microchannel as an efficient fluid-mixer is proposed, which is comprised of a channel and a series of blocks periodically attached on the bottom surface of the channel.
Journal ArticleDOI
Measurement of flow in microfluidic networks with micrometer-sized flow restrictors
Jian-Bin Bao,D. Jed Harrison +1 more
Abstract: The fluid dynamics in micrometer-sized flow restrictors was evaluated, to test the predictions of the Hagen–Poiseuille equation in small microchip devices. A photobleaching, time-of-flight linear flow rate measurement method was developed for the evaluation of flow in slot-shaped channels with at least one dimension in the size range of 1–3 μm. For a linear flow rate range in the narrowest dimension of 0.3 to 16 mm/s (volumetric flow rates of 0.6 to 32 nL/s, maximum Reynolds number of 0.3), observed flow rates agreed with theoretical predictions within experimental error (2–3%). An empirical equation for the geometric form factor of a D-shaped channel was developed, providing a useful working curve for use of the Hagen–Poiseuille equation in microfluidics design. The Hagen–Poiseuille solution can be used to design multiport devices with intersecting flow channel networks, achieving the intended flow rate ratios in channels with differing flow resistance with an accuracy of 1–2%. Despite the differences between achieved etched dimensions and the nominal design values a deviation of only 1–4% in the flow ratios was also achieved. This observation provides a useful guideline for predicting tolerance sensitivity in device manufacture. © 2005 American Institute of Chemical Engineers AIChE J, 2006
Journal ArticleDOI
Micro-Channels: Reality and Myth
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Bonding of a complicated polymer microchannel system for study of pressurized liquid flow characteristics with the electric double effect
TL;DR: In this paper, the electric double-layer (EDL) effect is studied in a microchannel made by polymer materials, which can be readily applied in a complicated lab-on-chip system for the study of micro-fluid behavior.
References
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Boundary layer theory
TL;DR: The flow laws of the actual flows at high Reynolds numbers differ considerably from those of the laminar flows treated in the preceding part, denoted as turbulence as discussed by the authors, and the actual flow is very different from that of the Poiseuille flow.
Journal ArticleDOI
Measurement of friction factors for the flow of gases in very fine channels used for microminiature Joule-Thomson refrigerators
Wu Peiyi,W.A. Little +1 more
TL;DR: In this article, the friction factors for the flow of gases in the fine channels used for microminiature Joule-Thomson refrigerators have been measured using a photolithographic technique.
Journal ArticleDOI
Experimental Investigation on Liquid Forced-Convection Heat-Transfer Through Microchannels
B. X. Wang,Xiaofeng Peng +1 more
TL;DR: In this paper, the authors investigated the single-phase forced-flow convection of water or methanol flowing through microchannels with rectangular cross-section and found that the fully developed turbulent convection regime was initiated at about Re = 1000-1500.
Journal ArticleDOI
Frictional flow characteristics of water flowing through rectangular microchannels
TL;DR: In this paper, the authors investigated the flow characteristics of water flowing through rectangular microchannels having hydraulic diameters of 0.133-0.367 mm and H/W ratios between 0.333-1.72i.
Journal ArticleDOI
Measurement of the heat transfer characteristics of gas flow in fine channel heat exchangers used for microminiature refrigerators
Peiyi Wu,W.A. Little +1 more
TL;DR: In this article, heat transfer characteristics have been measured for the flow of gas in the fine channels of the heat exchangers used for microminiature J-T refrigerators.
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Convective heat transfer and flow friction for water flow in microchannel structures
Xiaofeng Peng,G. P. Peterson +1 more