Simulations of slip flow on nanobubble-laden surfaces.
Summary of "Simulations of slip flow on nanobubble-laden surfaces."
On microstructured hydrophobic surfaces, geometrical patterns may lead to the appearance of a superhydrophobic state, where gas bubbles at the surface can have a strong impact on the fluid flow along such surfaces. In particular, they can strongly influence a detected slip at the surface. We present two-phase lattice Boltzmann simulations of a flow over structured surfaces with attached gas bubbles and demonstrate how the detected slip depends on the pattern geometry, the bulk pressure, or the shear rate. Since a large slip leads to reduced friction, our results give assistance in the optimization of microchannel flows for large throughput.
MTT Agrifood Research Finland, FI-31600 Jokioinen, Finland.
This article was published in the following journal.
Name: Journal of physics. Condensed matter : an Institute of Physics journal
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/21508490
- DOI: http://dx.doi.org/10.1088/0953-8984/23/18/184106
The Navier boundary condition for velocity slip on flat surfaces, when expressed in tensor form, is readily extended to surfaces of any shape. We test this assertion using molecular dynamics simulatio...
Superhydrophobic Cassie textures with trapped gas bubbles reduce drag, by generating large effective slip, which is important for a variety of applications that involve a manipulation of liquids at th...
We experimentally investigate the Poiseuille flows in nanochannels. It is found that the flow rate undergoes a transition between two linear regimes as the shear rate is varied. The transition indicat...
In the past few decades, much research has been devoted to nanoscale transport, despite of the complexity. Here we present results, which are counterintuitive, showing that adsorption of polystyrene-b...
We demonstrate that flows in confined systems are controlled by slip heterogeneities below a certain size. To show this we image the motion of soft glassy suspensions in microchannels whose inner wall...
The purpose of this study is to monitor the renal function of patients who have an antibiotic laden spacer in place to treat an infected hip or knee arthroplasty.
Overall Aim: To describe and to assess the change in the temporal profile and transmission of microorganisms between patients and environmental surfaces after admission into a newly disinf...
The study proposed that both clinical and subclinical HSV reactivation is associated with increased HIV shedding from mucosal surfaces, which may increase the infectiousness of HIV-1/HSV-2...
The goal of this clinical research study is to learn if high-flow oxygen, low-flow oxygen, high-flow air, or low-flow air, when given during structured exercise sessions, can help reduce d...
An influenza pandemic has recently been declared, involving the novel A(H1N1) 'swine flu' virus. This has spread to almost 100 countries worldwide in less than two months, causing widespre...
Medical and Biotech [MESH] Definitions
A replica technique in which cells are frozen to a very low temperature and cracked with a knife blade to expose the interior surfaces of the cells or cell membranes. The cracked cell surfaces are then freeze-dried to expose their constituents. The surfaces are now ready for shadowing to be viewed using an electron microscope. This method differs from freeze-fracturing in that no cryoprotectant is used and, thus, allows for the sublimation of water during the freeze-drying process to etch the surfaces.
A procedure to increase the flow of blood to the MYOCARDIUM by creating transmural channels in the heart wall via the application of laser pulses to epicardial or endocardial surfaces.
The amount of PLASMA that perfuses the KIDNEYS per unit time, approximately 10% greater than effective renal plasma flow (RENAL PLASMA FLOW, EFFECTIVE). It should be differentiated from the RENAL BLOOD FLOW; (RBF), which refers to the total volume of BLOOD flowing through the renal vasculature, while the renal plasma flow refers to the rate of plasma flow (RPF).
The study of the deformation and flow of matter, usually liquids or fluids, and of the plastic flow of solids. The concept covers consistency, dilatancy, liquefaction, resistance to flow, shearing, thixotrophy, and VISCOSITY.
Ultrasonography applying the Doppler effect, with the superposition of flow information as colors on a gray scale in a real-time image. This type of ultrasonography is well-suited to identifying the location of high-velocity flow (such as in a stenosis) or of mapping the extent of flow in a certain region.