Abstract. In this paper we investigate the heterogeneous multiscale methods (HMM) for interface tracking and apply the technique to the simulation of combustion fronts. Our goal is to overcome the numerical difficulties, which are caused by different time scales between the transport part and the reactive part in the model equations of some interface tracking problems, such as combustion proces...

Correlation between results of a Conventional macroscale (5 ml of blood) atomic absorption procedure for lead determination and results of the Delves micro-scale (10 tl blood) atomic absorption method was high (0.96). Analyses of lead in capillary and intravenous blood samples also correlated well (0.93). The coefficient of variation of the Delves micro-scale method was 8% for a concentration o...

Microscale tipstreaming is a hydrodynamic phenomenon capable of producing submicron sized droplets within a microfluidic device. Tipstreaming is the ejection of small drops from a liquid thread formed by interfacial tension gradients and convective transport of surfactant. To use tipstreaming in potential applications, including nanoparticle synthesis, chemical detection and separation, occlusi...

Titanium dioxide (TiO2) nanoparticles (NPs) are widely used in paints, food colorants, cosmetics, pharmaceuticals, and many other applications. Due to their high refractive index, TiO2 NPs are common ingredients in sun protection products used to guard against UV exposure. However, the fate of NPs in the environment and the potential for toxic effects once absorbed into the body remain largely ...

Mortar method is proposed to form a macroscopic model for a problem with a multiscale conductivity. The macroscopic model is built on the coarse uniform grid quipped for the problem domain. For each uniform grid, artificial neighboring cells are attached to form a model which includes the localized microscale model. For the proposed model, a very fine mesh is introduced to resolve the microscal...

In this paper, using vortex blob method (VBM), turbulent flow in a channel is studied and physical concepts of turbulence are obtained and discussed. At first, time-averaged velocities,  and , and then their fluctuations are calculated. To clarify turbulence structures, velocity fluctuations and  are plotted. It is observed that turbulence structures occupy different positions and move with con...

Ionic rectifier membranes or devices generate uni-directional ion transport to convert an alternating current (AC) input into stored energy direct (DC) in the form of ion/salt gradients. Electrochemical experiments 80 years ago were conducted on biological membrane systems, but today a plethora artificial ionic types has been developed and electroanalytical tools are employed explore mechanisms...

Miniaturization and microfabrication of analytical instrumentation for chemical and biological analyses has been proceeding at a rapid pace for a few decades, and has gained momentum in the past decade with the introduction and application of microfabricated instruments. Motivating factors for performing microscale separations and analyses are reduced reagent, solvent and sample consumption, re...