Trebotich D. – TechConnect Briefs

Multiscale Rheology: New Results for the Kinetic Scale

Kallemov B., H. Miller G., Mitran S., Trebotich D., Lawrence Berkeley National Laboratory, US

We present several new results on the kinetic, i.e., mesoscale, level of a continuum-kinetic-microscopic approach to multiscale modeling of complex fluids. We choose the microscopic level as Kramers’ bead-rod model for polymers, which we describe [...]

Polymer Simulation in a Microfluidic Entropic Trap

Kallemov B., Trebotich D., Miller G.H., Lawrence Berkeley Natinal Laboratory, US

We have developed a novel algorithm for the simulation of polymer-laden flows in microfluidic devices. Our algorithm is based on a hybridization of high order accurate continuum and particle methods. The continuum method provides the [...]

A Higher-Order Approach to Fluid-Particle Coupling in Microscale Polymer Flows

Kallemov B., Miller G.H., Trebotich D., Lawrence Livermore Natioanal Laboratory, US

Flows containing long-chain polymers are viscoelastic on macroscopic length scales, but in microscale and nanoscale flows hybrid fluid-particle approaches are more suitable. Such an approach would enable more complex predictive modeling, including polymer-wall interactions like [...]

A Computational Model with Experimental Validation for DNA Flow in Microchannels

Nonaka A., Gulati S., Trebotich D., Miller G.H., Muller S., Liepmann D., UC Davis / Lawrence Livermore National Laboratory, US

We compare a computational model to experimental data for DNA-laden flow in microchannels. The purpose of this work in progress is to validate a new numerical algorithm for viscoelastic flow of an Oldroyd-B fluid. Significant [...]

A Numerical Algorithm for Complex Biological Flow in Irregular Microdevice Geometries

Trebotich D., Colella P., Miller G.H., Nonaka A., Marshall T., Gulati S., Liepmann D., Lawrence Livermore National Laboratory, US

We present a numerical algorithm to simulate non-Newtonian flow in complex microdevice components. The model consists of continuum viscoelastic incompressible flow in irregular microscale geometries. Our numerical approach is the projection method of Bell, Colella [...]

A Numerical Model of Viscoelastic Flows in Microchannels

Trebotich D., Colella P., Miller G., Liepmann D., Lawrence Livermore National Laboratory, US

We present a numerical method to model non-Newtonian, viscoelastic flow at the microscale. The equations of motion are the incompressible Navier-Stokes equations coupled with the Oldroyd-B constitutive equation. This constitutive equation is chosen to model [...]

Optimization of a MEMS Based Micro Capillary Pumped Loop for Chip-Level Temperature Control

Trebotich D., Kirshberg J., Teng J., Liepmann D., University of California, US

Recent results in the microfluidics group at the Berkeley Sensor and Actuator Center and the Air Force Research Laboratory have shown that a micro-capillary pumped loop (micro-CPL) can move extreme amounts of heat (< 200 [...]

Modeling of Blood Flow in Simple Microchannels

Trebotich D., Chang W., Liepmann D., University of California-Berkeley, US

Optimal design of medical micro-assay systems will require computational modeling capabilities. Most existing models are based on macroscale experiments with smallest length dimensions comparable to that of a capillary due to the fact that the [...]