Measurements of interfacial area concentration in two-phase bubbly flow Page: 4 of 8
This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to Digital Library by the UNT Libraries Government Documents Department.
The following text was automatically extracted from the image on this page using optical character recognition software:
Measurements of Interfacial Area Concentration in Two-Phase Bubbly Flow
Q. Wu, S. Kim, D. McCreary, M. Ishii ( Purdue Univ. ), S.G. Beus (Bettis Atomic Power L.b)
Interfacial area concentration is an important parameter in the two-fluid model  for two-phase flow
analysis, which is defined as the total interface area per unit mixture volume and has the Lollowing local
time-averaged expression :
A = , (1)
AT J V ", -n
where denotes the j-th interface that passes the point of interest in a time interval AT. V; and n; refer to the
bubble interface velocity and surface normal vector, respectively. To measure this paramnter, the double-
sensor probe technique is commonly used. Due to the influences of the bubble lateral motions, however, the
measurement results should be interpreted via a certain statistic approach . Recently, to take into account
the effects of the probe spacing, Wu and Ishii provided the following new formula :. correlate the
measurable values to the interfacial area concentration :
-t - 2Nb 2+ L.4 2.251 for D = L2 2.8As, (2)
where Nb refers to the number of the bubbles that hit the probe front tip during time interval AT, As denotes
the distance between the two probe tips, D is the bubble diameter, At represents the measured average time
interval for a interface to travel through the two probe tips, and au is the standard devi:i )n of At. The
theoretical accuracy of this formula is within 5% if the sample size is sufficiently large. -i h purpose of
this study is to evaluate this method experimentally using an image processing method.
DESCRIPTION OF THE ACTUAL WORK
Here’s what’s next.
This article can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Article.
Wu, Q.; Kim, S.; McCreary, D.; Ishii, M. & Beus, S.G. Measurements of interfacial area concentration in two-phase bubbly flow, article, December 31, 1997; West Mifflin, Pennsylvania. (https://digital.library.unt.edu/ark:/67531/metadc684946/m1/4/: accessed March 22, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.