In this paper, Computational Fluid Dynamics technique and numerical analysis is used to investigate the rocket thrust chamber cooling characteristics. The scope of the investigation involves the study of effect of aspect ratio (height/width) on the heat transfer characteristics of coolant channel. Steady state pressure based analysis of semi cryogenic thrust chamber regenerative cooling channel...

We report here on a batch microfabrication approach for producing ultra-smooth, high-aspect ratio structures in silicon dioxide and quartz fi lms, and we apply that method towards the construction of planar-patch clamp electrophysiology devices that, for the fi rst time, achieve the performance metrics of the very best micropipette-based patch-clamp approaches. The patch-clamp method has been a...

this paper presents the results of a numerical study on the removal process of fluid particles under the influence of mixed convection in a horizontal channel with an open cavity. the bottom wall of the cavity is heated at a constant temperature (th), while the top wall is maintained at a relatively low temperature (tc). fluid with a uniform velocity (uo) and temperature (tc) is introduced into...

In the present paper, a fundamental analysis on effect of channel aspect ratio bubble dynamics and heat transfer characteristics for early transient stages growth within confined microchannels rectangular cross-section, under saturated flow boiling conditions, is conducted, utilising high resolution, 3D, transient, conjugate simulations. The open-source toolbox OpenFOAM applied simulations, cus...

This paper presents correlations for heat transfer and friction coefficients for combined entry region airflow in 3D rectangular channel as functions of channel depth, Reynolds number, hydraulic diameter, and channel aspect ratio. The correlations were designed to approach known physical limits as the channel aspect ratio and channel depth approach zero, and as the flow becomes fully developed....

Two-dimensional Poisson-Boltzmann and momentum equations are solved simultaneously to study the transient characteristics of electro-osmotic pumping in a rectangular microchannel. A finite difference scheme with variable grid spacing is used to calculate electric potential distribution. Time variations of velocity profiles are obtained by using a combined ADI-TDMA technique. Numerical solutions...

This paper describes laminar fluid flow through a three-dimensional elastomeric microstructure formed by two microfluidic channels, fabricated in layers that contact one another face-to-face (typically at a 90 degree angle), with the fluid flows in tangential contact. There are two ways to control fluid flow through these tangentially connected microchannels. First, the flow profiles through th...

In order to acquire radiation-tolerant characteristics in integrated circuits, a dummy gate-assisted n-type metal oxide semiconductor field effect transistor (DGA n-MOSFET) layout was adopted. The DGA n-MOSFET has a different channel shape compared with the standard n-MOSFET. The standard n-MOSFET has a rectangular channel shape, whereas the DGA n-MOSFET has an extended rectangular shape at the...

We present an experimental study of the aspect-ratio dependence of two-phase displacement flows in channels of rectangular cross section. Above a buoyancy-dependent threshold Ca[over ;]_{t}, we find that the bulk features of the flow depend only on a modified capillary number Ca[over ;]=[1+0.12(alpha-1)+0.018(alpha-1);{2}]Ca, where Ca is the unmodified capillary number and alpha is the aspect r...