Effect of surface tension‐driven flow on BaB₂O₄ crystal growth from high temperature melt‐solution

Abstract

The surface tension driven-flow in BaB 2 O 4 (BBO) melt-solution is visualized by differential interference microscope coupled with Schlieren technique, and the streamline of the steady thermocapillary convection is found to be in form of an axially symmetric pattern. Based on the observation of BBO crystal rotation caused by the convective vortex, the widths of interfacial concentration, heat and momentum boundary layer are calculated. The effect of thermocapillary convection on boundary layer thickness is also investigated. Results show that the width of boundary layer decreases linearly with the increasing of dimensionless Marangoni number.

Chasing drops: Following escaper and pursuer drop couple system

“…The Marangoni effect [1][2][3] is a general term for a family of flows induced by some interfacial tension gradient associated with either chemical [4] or thermal [5] gradients with numerous applications and ramifications [5][6][7][8][9][10][11][12][13][14]. In this study we focus on chemically induced Marangoni flow, for which one can distinguish between two different but related systems:…”

Unsteady Growth ofBaB2O4Single Crystal from High-Temperature Solution

“…Time traces of normal growth rate V , step velocity υ, and local growth rate R for the {1010} interface.along the heater, d is the characteristic length of the liquid, η is the dynamic viscosity, and κ is the thermal diffusivity. For a coarse estimate[12], the value of M a is about 20 in present solution system, which cannot trigger oscillatory Marangoni Step bunching showing the interfacial instability of a vicinal face.…”

“…Furthermore, the value of dimensionless Marangoni number Ma = σ T ΔTd/ηκ characterizing the strength of thermocapillary convection was also calculated for investigating the effect of Marangoni flow. Here σ T = dσ/dT is the temperature coefficient of surface tension σ, ΔT is the horizontal temperature difference X. H. Pan et al flows for BBO solution according to the discussions in our previous work [12,13].…”

Three-Dimensional Reconstruction of Evaporation-Induced Instabilities Using Volumetric Scanning Particle Image Velocimetry

“…Flow instabilities in an evaporating liquid appear in a variety of industries and applications, including crystallization [1,2], heat pipe cooling [3][4][5], particle self-assembly on surfaces [6,7], welding [8,9], spray cooling [10] and design of biosensors [11]. Quantification of the flow field and visualization of the convective structure of these instabilities has been the subject of several studies since the seminal work of Bénard [12] who observed a regular pattern of convective cells inside an evaporating thin liquid film with a free upper surface that was heated from the bottom.…”