Jung Yul Yoo

TL;DR: In this paper, the authors investigated the evaporation characteristics of water droplets on hydrophobic and hydrophilic surfaces using the digital image analysis technique and measured the time-dependent contact angle, center height, contact radius, surface area, and volume of droplet.

TL;DR: In this paper, the authors used a SIMPLE-based segregated streamline upwind Petrov-Galerkin finite element method to investigate flow and heat transfer characteristics of confined impinging slot jets.

TL;DR: In this paper, a novel expression for the thermal conductivity of nanofluids is proposed, which incorporates the kinetic theory to describe the contribution of the Brownian motion of the nanoparticles with a more realistic definition of the mean free path.

TL;DR: In this paper, the lateral migration of neutrally buoyant particles through square microchannels has been experimentally investigated over a Reynolds number range of 006 ≤ Re ≤ 5865 at the ratio of channel hydraulic diameter to particle size, λ ≈ 14 Flow Reynolds numbers are determined by applying a conventional particle-tracking algorithm to small tracer particles, while novel imaging techniques have been proposed for identifying and defining the measurement depth of large test particles.

TL;DR: Axisymmetric flow focusing of particles in a single microchannel is proposed on the basis of the observation that a particle migrates toward the tube axis when it lags behind the fluid flow, which is supported by demonstrating that more than 90% of the particles are tightly focused within three times the particle diameter when negative electrophoretic mobility is imposed on the particles.