Steady-state two-phase flow in porous media is a process whereby a wetting phase displaces a non-wetting phase within a pore network. It is a stationary, off equilibrium process -in the sense that it is maintained in dynamic equilibrium on the expense of energy supplied to the system. The efficiency of the process depends on its spontaneity, measurable by the rate of global entropy production. ...

The static shape of drop under electrowetting actuation is well studied and recent electrowetting theory and experiments confirm that the local contact angle (microscopic angle) is unaffected while the apparent contact angle (macroscopic angle) is characterized by the Lippmann-Young equation. On the other hand, the evolution of the drop motion under electrowetting actuation has received less at...

the high pressure behavior of the structural and electronic properties of kc1 is studied with use of the density functional pseudopotential method within local-density approximation. atzero pressure, the rocksalt phase is found to be lower in energy than cscl structure. however, we predict a phase transition into csci structure at a pressure of about 1.5 gpa. the calculated ground state propert...

R. F. Busse Applied Science Lab West, GE Medical Systems, Menlo Park, CA, United States Introduction For fast spin echo sequences, power can be greatly reduced while suffering only modest reduction in signal by using low flip angle refocusing pulses, provided the flip angles of the first few pulses are modulated so as to maintain pseudo-steady-state (pss) conditions in the spin system (1). Rece...

The aim of upscaling is to determine equivalent homogeneous parameters at a coarse-scale from a spatially oscillating fine-scale parameter distribution. A large variety of upscaling methods is available, among which the homogenization method plays an important role. This paper presents an extension of the classical homogenization method to nonlinear problems as they occur while upscaling parame...

This paper deals with the computation of two-phase flows in a porous medium, with two main objectives. First of all, we will present a new multi-dimensional well-balanced scheme, with its advantages and drawbacks. Furthermore, we will compare results of the porous model with approximations obtained with a full two-dimensional computation, where all obstacles have been taken into account in the ...

In this paper, hybrid pulse width modulation algorithm for vector controlled induction motor drives is used to reduce the steady state ripple in current. Also the newly developed Hybrid PWM technique does not use angle and sector information and hence it simplifies the control algorithm. The conventional Space vector pulse width modulation (CSVPWM) algorithm gives inferior performance at higher...

We used a molecular dynamics simulation with the modified Brenner reactive empirical bond order potential to investigate the erosion of a graphite surface due to the incidence of hydrogen, deuterium, and tritium atoms. Incident particles cause pressure on the graphite surface, and the chemical bond between graphene layers then generates heat to erode the graphite surface. We evaluated the speed...

A true-to-mechanism model is proposed, which considers steady-state two-phase ̄ow in porous media (SS2uPM) as a composition of two prototype ̄ows, namely ganglion dynamics (GD) and connected-oil pathway ̄ow (CPF). Coupling of the prototype ̄ows is e€ected with the simple rule that the macroscopic pressure gradient is the same in both. For a given set of values of the ̄ow system parameters, a dom...

We study a M/Ek/1 queueing model where the service is provided in two phases one by one in secession. The server operates N-policy. Customer’s arrival rate depends on the state of the server. The service mechanism breakdowns occur only during active service and repair process may not take place immediately due to non-availability of the repair facility. We derive the steady state solutions by u...