Investigation on liquid flow characteristics in microtubes

Abstract

in Wiley Online Library (wileyonlinelibrary.com)The fundamental understanding and prediction of liquid flow characteristics in microscale are important to control the performance of microfluidic devices. However, fundamental questions about liquid flow characteristics in microscale have not been settled yet and systematical investigation is needed. A systematical investigation on liquid flow characteristics through microtubes with diameters varying from 44.5-1011 lm and relative roughness in the range 0.02-4.32% in the Reynolds number range 29-11,644 was performed in this work, using water as working fluid. Experimental results indicated that early transition occurred when the diameter was smaller than 1000 lm, the transitional flow characteristics for smooth microtubes differed from rough microtubes and the friction factor in turbulent region for rough microtubes was larger than conventional theory. Moreover, a parameter a was proposed to describe the characteristic of microtube. The characteristic parameter was used to calculate the critical Reynolds number and the friction factor in turbulent region for microscale. V C 2014 American Institute of Chemical Engineers AIChE J, 61: 718-735, 2015 SS and FS stand for stainless steel and fused silica, respectively.

Analytical, experimental, and numerical analysis of a microchannel cooling system for high-concentration photovoltaic cells

“…The discrepancies in the curves for G values from 300 to 800 kg/m 2 s, corresponding to Reynolds numbers ranging from 100 to 300 (i.e., laminar flow), may be due to an early transition behavior between laminar and turbulent flows for 200 < G < 700 kg/m 2 s, as described by [28][29][30]. Cheng et al [31] reported similar results from other works and related them to the smaller dimensions of the microchannels.…”

Microfluidic behavior in melt-spun hollow and liquid core fibers

“…In contrast, mixed reports can be found when looking at flow in microtubes with i.d. smaller than 50 µm where, for instance, Chen et al [11] confirm the applicability of the HagenPoiseuille theory to analyze the flow of deionized water in a poly-ether-ether-ketone tube with an i.d. of 44.5 µm, whereas Zhigang et al [12] report the opposite behavior for the flow of distilled water in a quartz glass microtube with an i.d.…”

Hydrodynamic Study of Single- and Two-Phase Flow in an Advanced-Flow Reactor

“…[1][2][3][4] Microfluidic devices, as understood herein, refer to fluidic devices over a scale ranging from microns to a few millimeters, or more specifically in the range of about 10 microns to about 2 millimeters. 5 Some key microfluidic devices that have been used in large-scale production include the Corning Advanced-Flow Reactor (solketal tertbutyl ether, 12 kg/h), 6 Forschungszentrum Karlsruhe (FZK) reactor (polymer intermediate, 30 tons/week), 7 …”

“…1−4 Microfluidic devices, as understood herein, refer to fluidic devices over a scale ranging from microns to a few millimeters, or more specifically in the range of about 10 μm to about 2 mm. 5 Some key microfluidic devices that have been used in large-scale production include the Corning Advanced-Flow reactor (AFR) (solketal tert-butyl ether, 12 kg/h), 6 the Forschungszentrum Karlsruhe (FZK) reactor (polymer intermediate, 30 tons/week), 7 Alfa Laval Plate Reactor or Open Plate Reactor (sodium sulfate, ∼5 kg/h), 8 the IMM cylindrical falling film microreactor (nitroglycerine, 15 kg/h), 9 and Ehrfeld BTS MIPROWA systems (10−10000 L/h). 10 The aforementioned reactor systems are characterized by various channel geometries, diverse mixing and heat exchange designs, and thus distinctive scale-up strategies.…”

“…In the past two decades, there has been an increased interest in research on microfluidic technology for use in chemical synthesis from laboratory-scale to large-scale production. − Microfluidic devices, as understood herein, refer to fluidic devices over a scale ranging from microns to a few millimeters, or more specifically in the range of about 10 μm to about 2 mm . Some key microfluidic devices that have been used in large-scale production include the Corning Advanced-Flow reactor (AFR) (solketal tert -butyl ether, 12 kg/h), the Forschungszentrum Karlsruhe (FZK) reactor (polymer intermediate, 30 tons/week), Alfa Laval Plate Reactor or Open Plate Reactor (sodium sulfate, ∼5 kg/h), the IMM cylindrical falling film microreactor (nitroglycerine, 15 kg/h), and Ehrfeld BTS MIPROWA systems (10–10000 L/h) .…”