Some Observations of Flow Patterns and Statistical Properties of Three Component Flows
CaltechAUTHORS
View Archive InfoField  Value  
Title 
Some Observations of Flow Patterns and Statistical Properties of Three Component Flows


Creator 
Kytomaa, H. K.
Brennen, C. E. 

Subject 
Caltech Library Services


Description 
Vertical airwater flows, solidswater flows and three component airsolidswater flows were investigated in a Three Component Flow Facility. Visual observations of the flow patterns show that three component flows undergo transition and can exhibit strong unsteady vortical motions. Measurements of the fluctuations in crosssectionally averaged volume fraction measurements were made. The statistical properties of the fluctuations are presented in terms of their amplitude and coherent time scale in the form of the Signal To Noise Ratio (STNR) and the Time Constant (symbol), respectively. Remarkably, the solidswater flows and the dispersed bubbly airwater flows exhibit almost identical values of STNR for the same volume fraction. Equally remarkable in the linear relationship between the Time Constant and the mean bubble or particle velocity; this relationship is found to have the same constant of proportionality for both species in the well behaved disperse regime. In the twocomponent churnturbulent and the threecomponent agitated vortical regimes, the variables (symbol) and STNR significantly deviate from their dispersed regime values. The onset of large coherent structures characteristic of these regimes is reflected by a rise in the amplitude of the fluctuations and a marked increase in their coherent time scale. The results of this study demonstrate the large information content in the fluctuations of the measured quantity, both as a flow regime indicator and as a measure of flow quantities in two and threecomponent flows.


Date 
198803


Type 
Article
PeerReviewed 

Format 
application/pdf


Identifier 
http://authors.library.caltech.edu/121/1/KYT083.pdf
Kytomaa, H. K. and Brennen, C. E. (1988) Some Observations of Flow Patterns and Statistical Properties of Three Component Flows. Journal of Fluids Engineering, 110 (1). pp. 7684. ISSN 00982202. http://resolver.caltech.edu/CaltechAUTHORS:KYTjfe88 <http://resolver.caltech.edu/CaltechAUTHORS:KYTjfe88> 

Relation 
http://resolver.caltech.edu/CaltechAUTHORS:KYTjfe88
http://authors.library.caltech.edu/121/ 
