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Determination of two-dimensional correlation lengths in an anisotropic two-component flow

Technical Report:

Abstract

Former studies have shown that correlation methods can be used for determination of various two-component flow parameters, among these the correlation length. In cases where the flow can be described as a mixture, in which the minority component forms spatially limited perturbations within the majority component, this parameter gives a good indication of the maximum extension of these perturbations. In the former studies, spherical symmetry of the perturbations has been assumed, and the correlation length has been measured in the direction of the flow (axially) only. However, if the flow structure is anisotropic, the correlation length will be different in different directions. In the present study, the method has been developed further, allowing also measurements perpendicular to the flow direction (radially). The measurements were carried out using laser beams and the two-component flows consisted of either glass beads and air or air and water. In order to make local measurements of both the axial and radial correlation length simultaneously, it is necessary to use 3 laser beams and to form the triple cross-covariance. This lead to some unforeseen complications, due to the character of this function. The experimental results are generally positive and size determinations with an accuracy of better  More>>
Authors:
Publication Date:
May 01, 1994
Product Type:
Technical Report
Report Number:
CTH-RF-105
Reference Number:
SCA: 420400; 440800; PA: AIX-26:006246; EDB-95:009286; SN: 95001299357
Resource Relation:
Other Information: PBD: May 1994
Subject:
42 ENGINEERING; 47 OTHER INSTRUMENTATION; MEASURING INSTRUMENTS; TWO-PHASE FLOW; MEASURING METHODS; CORRELATIONS; GAS FLOW; LASERS; LIQUID FLOW; 420400; 440800; HEAT TRANSFER AND FLUID FLOW; MISCELLANEOUS INSTRUMENTATION
OSTI ID:
10102922
Research Organizations:
Chalmers Univ. of Technology, Goeteborg (Sweden). Dept. of Reactor Physics
Country of Origin:
Sweden
Language:
English
Other Identifying Numbers:
Journal ID: ISSN 0281-9775; Other: ON: DE95610125; TRN: SE9400174006246
Availability:
OSTI; NTIS; INIS
Submitting Site:
SWDN
Size:
16 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Thomson, O. Determination of two-dimensional correlation lengths in an anisotropic two-component flow. Sweden: N. p., 1994. Web.
Thomson, O. Determination of two-dimensional correlation lengths in an anisotropic two-component flow. Sweden.
Thomson, O. 1994. "Determination of two-dimensional correlation lengths in an anisotropic two-component flow." Sweden.
@misc{etde_10102922,
title = {Determination of two-dimensional correlation lengths in an anisotropic two-component flow}
author = {Thomson, O}
abstractNote = {Former studies have shown that correlation methods can be used for determination of various two-component flow parameters, among these the correlation length. In cases where the flow can be described as a mixture, in which the minority component forms spatially limited perturbations within the majority component, this parameter gives a good indication of the maximum extension of these perturbations. In the former studies, spherical symmetry of the perturbations has been assumed, and the correlation length has been measured in the direction of the flow (axially) only. However, if the flow structure is anisotropic, the correlation length will be different in different directions. In the present study, the method has been developed further, allowing also measurements perpendicular to the flow direction (radially). The measurements were carried out using laser beams and the two-component flows consisted of either glass beads and air or air and water. In order to make local measurements of both the axial and radial correlation length simultaneously, it is necessary to use 3 laser beams and to form the triple cross-covariance. This lead to some unforeseen complications, due to the character of this function. The experimental results are generally positive and size determinations with an accuracy of better than 10% have been achieved in most cases. Less accurate results appeared only for difficult conditions (symmetrical signals), when 3 beams were used. 5 refs, 13 figs, 3 tabs.}
place = {Sweden}
year = {1994}
month = {May}
}