Table of Contents
Journal of Thermodynamics
Volume 2011 (2011), Article ID 491350, 10 pages
http://dx.doi.org/10.1155/2011/491350
Research Article

A High-Resolution Resistive Probe for Nonlinear Analysis of Two-Phase Flows

DIIM, Università Degli Studi di Catania, Viale A. Doria n. 6, 95125 Catania, Italy

Received 11 April 2011; Accepted 27 June 2011

Academic Editor: D. W. Pepper

Copyright © 2011 L. Cantelli et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Two-phase flow dynamics are highly complex, due to the strong coupling of various independent mechanisms and as demonstrated by the existence of a variety of flow patterns. The adoption of appropriate tools for nonlinear time series analysis tools may lead to a deeper insight in this complexity but requires high quality time series. This study describes a procedure appositely assessed in order to realise an impedance void fraction sensor of resistive type characterised by high-spatial and -temporal resolution. These characteristics have been accomplished through an appropriate geometrical design of the probe electrodes, aiming at obtaining a thin measurement volume so to improve the probe spatial resolution, and through the electronic assessment of the data acquisition system, improving its temporal resolution. A new calibration procedure has been also defined, based on an estimation of void fraction through a code for automatic extraction of bubble contours and the correction of image distortions.