نتایج جستجو برای: dimensional microchannels with triangular cross

تعداد نتایج: 9523484  

2004
Satish G. Kandlikar

The increased circuit density on today’s computer chips is reaching the heat dissipation limits for air-cooled technology. Direct liquid cooling of chips is being considered as a viable alternative. This paper reviews liquid cooling in terms of technological options and challenges. The possibilities presented herein indicate a fourto ten-fold increase in heat flux over the air-cooled systems. T...

The stress wave propagation in a generalized thermoelastic polygonal plate of inner and outer cross sections is studied using the Fourier expansion collocation method. The wave equation of motion based on two-dimensional theory of elasticity is applied under the plane strain assumption of generalized thermoelastic plate of polygonal shape, composed of homogeneous isotropic material.  The freque...

In this study, extraction of tannic acid using microchannel was investigated. Affective parameters were optimized. Different solvents including buthanol, ethylacetate and n-hexane as organic phase, methanol, propanol, ethanol and water as aqueous phase investigated. Microchannels with different confluence angles and diameters were examined. Microchannels with different confluence angles and dia...

2013
M. Akbari A. Tamayol M. Bahrami

A general model that predicts single-phase creeping flow pressure drop in microchannels of a noncircular cross section under slip and no-slip regimes is proposed. The model accounts for gradual variations in the cross section and relates the pressure drop to geometrical parameters of the cross section, i.e., area, perimeter, and polar moment of inertia. The accuracy of the proposed model is ass...

Journal: :Energies 2021

The paper presents the results of experimental research on pool boiling heat transfer dielectric liquid FC-72. Measurements were made at atmospheric pressure open surfaces with microchannels. Heat surfaces, in form parallel milled microchannels, copper. rectangular cross-sectional microchannels 0.2 to 0.5 mm deep and 0.4 wide. compared a smooth flat surface, provided five-fold increase coeffici...

2012
Wenming Wu Kieu The Loan Trinh Nae Yoon Lee

We propose a right triangular prism-shaped microdevice with serpentine microchannels fabricated on its slanted plane, and apply the device for on-chip flow-through PCR employing a single heater. The inclined nature of the qiandu-shaped microdevice enables the formation of a surface temperature gradient along the slanted plane of the microchannel by the use of a single heater. A 409 bp lung canc...

2004
Ki Bang Lee Liwei Lin

MUMPs (Multi-User MEMS Process) based microchannels made of either glass or polysilicon have been successfully designed, fabricated and tested. The fabrication process used timed wet-chemical etching to selectively etch sacrificial materials with the assistance of etch holes. The prototype glass and polysilicon microchannels have cross-section areas of 70 m×4 m and 70 m×2 m, respectively, and b...

2010
Aiko Nishimoto Shiro Yoshikawa Shinichi Ookawara

Cross-flow ultrafiltration of macromolecular solutions in a module with microchannels is expected to have the advantages of fast diffusion from the membrane surface and a high ratio of membrane surface area to feed liquid volume. Cross-flow ultrafiltration modules with microchannels are expected to be used for separation and refining and as membrane reactors in microchemical processes. Though t...

Journal: :Journal of Non-Newtonian Fluid Mechanics 2018

Journal: :Langmuir : the ACS journal of surfaces and colloids 2008
Siva A Vanapalli Christopher R Iacovella Kyung Eun Sung Deshpremy Mukhija Joanna M Millunchick Mark A Burns Sharon C Glotzer Michael J Solomon

We study fluidic assembly and packing of spherical particles in rectilinear microchannels that are terminated by a flow constriction. First, we introduce a method for active assembly of particles in the confined microchannels by triggering a local constriction in the fluid channel using a partially closed membrane valve. This microfluidic valve allows active, on-demand particle assembly as oppo...

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