Record Details

Performance evaluation of ceiling crystallization for suppressing buoyancy-induced convection in mass transfer applications: An interferometric study

DSpace at IIT Bombay

View Archive Info
 
 
Field Value
 
Title Performance evaluation of ceiling crystallization for suppressing buoyancy-induced convection in mass transfer applications: An interferometric study
 
Creator VARMA, SS
SRIVASTAVA, A
 
Subject STRONG MAGNETIC-FIELD
CRYSTAL-GROWTH
3-DIMENSIONAL RECONSTRUCTION
LYSOZYME CRYSTAL
AQUEOUS-SOLUTION
SURFACE-TENSION
SOLIDIFICATION
TEMPERATURE
TOMOGRAPHY
Mass transfer
Convection
Diffusion
Crystal growth
Aqueous solution
Interferometry
 
Description The present study is concerned with the investigation of the phenomena of solute transport in aqueous solution-based crystal growth processes when the growing crystal is fixed in the upside-down (ceiling) configuration. The ceiling crystallization method has been employed for suppressing the adverse effects of buoyancy when the crystal growth experiments are conducted under normal gravity conditions. A Mach-Zehnder interferometer has been employed to record the line-of-sight images of the concentration field. In order to assess the feasibility of the ceiling crystallization approach for creating diffusion-dominated conditions, the results have been compared with that of the conventionally employed approach wherein the growing crystal is platform-supported. Experiments have been carried out for two levels of supersaturation i.e. sigma = 2% and 4% and sodium chlorate (NaCIO3) has been chosen as the model material. Results have been presented in the form of interferometric images of the concentration field, two-dimensional concentration contours and spatio-temporal variations of supersaturation around the growing crystal in both the configurations considered. Results of the experiments clearly reveal the suppression of buoyancy-induced convection currents and the formation of an extended horizontally stratified depletion zone around the growing crystal in ceiling configuration. The mass transport phenomenon was seen to be diffusion-dominated, thus eliminating the possibilities of sharp variations in the supersaturation levels in the vicinity of the crystal, which otherwise deteriorate the quality of the growing crystal in convection-dominated conditions. (C) 2014 Elsevier Ltd. All rights reserved.
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2016-01-14T13:52:37Z
2016-01-14T13:52:37Z
2015
 
Type Article
 
Identifier INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 84,61-72
0017-9310
1879-2189
http://dx.doi.org/10.1016/j.ijheatmasstransfer.2014.12.050
http://dspace.library.iitb.ac.in/jspui/handle/100/17662
 
Language en