PERSONAL DE APOYO
AMAR Andrea Mariela
artículos
Título:
Flow dynamics measured and simulated inside a single levitated droplet
Autor/es:
E. GROSS-HARDT; A. AMAR; S. STAPF; B. BLUEMICH; A. PFENNIG
Revista:
Industrial and Engineering Chemistry Research
Editorial:
ACS
Referencias:
Año: 2006 p. 416 - 423
ISSN:
0888-5885
Resumen:
The flow dynamics inside a single liquid droplet of toluene levitated by a countercurrent of deuterated water (D2O)
is investigated noninvasively and quantitatively by nuclear magnetic
resonance (NMR) imaging techniques for the first time and compared with
computational fluid-dynamics (CFD) calculations. For this purpose, a unique device is developed meeting the requirements for long period measurements (namely ; a permanently stable droplet position and shape) and for measurements on series of droplets (namely, a
high reproducibility of generation and position of droplets). The
measurement cell of this device is manufactured with low tolerances
regarding axial symmetry and positioned vertical and central in the NMR
magnet with high precision enabling axially symmetric flow dynamics. The
measured flow field shows good agreement with 2D axially symmetric CFD
calculations with the finite element (FEM) code SEPRAN. A
simple interface model with one free parameter accounts for the rigid
cap encountered in the measurements. This free parameter is estimated by
matching the velocity fields of the simulation with those determined
experimentally.