Journal ArticleDOI
A microfluidic experimental platform with internal pressure measurements
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TLDR
In this article, an off-chip optical-lever based system is used to measure pressure inside micro-channel for the range of hydraulic diameters tested, 25-100μm.Abstract:
Large inconsistencies in previous microchannel pressure drop data have motivated the development of a microchannel experimental platform that enables the measurement of pressures inside the microchannel. The system utilizes bulk etched silicon components that integrate pressure-sensing membranes with the microchannel test section. The deflection of the membranes is detected by an off-chip, optical-lever based system that allows the sensors to be calibrated for pressure measurement. The sensor sensitivity can be adjusted after microfabrication is complete, allowing for sensor optimization after fabrication. The sensor can be used in many applications where the fabrication of electrical contacts, piezoresistors and capacitors is problematic. Calibration uncertainties as low as 2% have been obtained during actual use of the system. The presented system resolves many of the issues associated with measuring pressures inside microchannels for the range of hydraulic diameters tested, 25–100 μm. The system has been used to study pressure drop in microchannels and a sample of the results is presented. It has been found that standard models with appropriate assumptions can accurately predict the measured pressure data.read more
Citations
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Journal ArticleDOI
An experimental investigation of microchannel flow with internal pressure measurements
TL;DR: In this article, a straight channel test section with integrated pressure sensors was developed with channel hydraulic diameters ranging from 25 to 100μm and compressible flow results for 6.8 Re Re
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High-speed microfluidic differential manometer for cellular-scale hydrodynamics
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Cellular-scale hydrodynamics
Manouk Abkarian,Magalie Faivre,Renita E. Horton,Kristian Smistrup,Catherine Best-Popescu,Howard A. Stone +5 more
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Flexible microfluidic device for mechanical property characterization of soft viscoelastic solids such as bacterial biofilms
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Journal ArticleDOI
Fluid flow and convective heat transfer in flat microchannels
TL;DR: In this paper, the authors investigate the design, construction and instrumentation of an experimental microchannel, with a rectangular cross-section and large aspect ratio, that allows characterization of the flow and convective heat transfer under well defined and precise conditions and makes it possible to vary the hydraulic diameter of the microchannel.
References
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TL;DR: In this paper, the authors discuss failure prevention of failure due to static loading and fatigue failure resulting from variable loading in the design of non-permanent joint components, such as screw heads, fasteners, and nonpermanent joints.
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Novel optical approach to atomic force microscopy
Gerhard Meyer,Nabil M. Amer +1 more
TL;DR: In this article, a simple optical method for detecting the cantilever deflection in atomic force microscopy is described, and the method is incorporated in an atomic force microscope, and imaging and force measurements, in ultrahigh vacuum, are successfully performed.
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Flow characteristics of water in microtubes
Gh. Mohiuddin Mala,Dongqing Li +1 more
TL;DR: 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.