Molecular dynamics (MD) and continuum simulations are carried out to investigate the influence of shear rate and surface roughness on slip flow of a Newtonian fluid. For weak wall-fluid interaction energy, the nonlinear shear-rate dependence of the intrinsic slip length in the flow over an atomically flat surface is computed by MD simulations. We describe laminar flow away from a curved boundar...

3D printed nanofiltration (NF) composite membranes with surface patterns minimising the impact of concentration polarisation (CP) are presented here for first time. The consist a NF polydopamine?coated polyvinylidene fluoride (PVDF/PDA) selective layer on asymmetric wavy (patterned) support. result is membrane pure water permeance 14 ± 2 LMH bar ? 1 and molecular weight cut-off ?550 Da, measure...

The electrical liquid film thickness (LFT) sensor developed at ETH Zurich is applied to study wavy annular flows. LFT consists of a matrix electrodes put flush the surface wall which interest present. conductance between transmitter and receiver sampled converted into using calibration function obtained for flat without waves. Due limited lateral resolution non-linear response, waves are charac...

Scanning tunneling microscopy images of 4.5° misoriented double B stepped Si͑001͒ have been analyzed to determine the double-layer step-edge formation energies of the energetically stable double step (B-type͒ as well as the energetically unstable double step (A-type͒. The ordering of the various single-and double-layer step-edge formation energies is in accordance with semiempirical tight-binding-b...

Abstract Surface gravity waves are formed by kinetic energy transfer across the air‐sea interface. Significant improvements have been made in understanding influence of wind on input waves. However, impact gustiness remains underexplored, and little is known about mechanisms through which gusts alter wavy surface. In this study, we utilize three‐months observational data collected during 2010 I...

Biology implements intriguing structural design principles that allow for attractive mechanical properties—such as high strength, toughness, and extensibility despite being made of weak and brittle constituents, as observed in biomineralized structures. For example, diatom algae contain nanoporous hierarchical silicified shells, called frustules, which provide mechanical protection from predato...

Background. Palatal rugae pattern of an individual is species specific and is said to be as unique as finger print. Aims and Objectives. The aim of this study was to identify and compare the rugae pattern of Igbo and Ikwerre populations in Nigeria for human identification purposes. Materials and Methods. The present study was conducted from random sampling of University of Port Harcourt student...

BACKGROUND The associations between the length and morphological shape-related characteristics of palatal rugae have not been fully explored. OBJECTIVE We aimed to assess the possible association among various geometric configurations of the palatal rugae in an adult population. MATERIALS AND METHODS The maxillary dental casts of 217 non-growing subjects (95 males, 122 females, mean age 25....

A three dimensional (3D) computational fluid dynamics (CFD) simulation and a neural network model are presented to estimate the behaviors of the Colburn factor (j) and the Fanning friction factor (f) for wavy fin-and-flat tube (WFFT) heat exchangers. Effects of the five geometrical factors of fin pitch, fin height, fin length, fin thickness, and wavy amplitude are investigated over a wide range...