Estimation of the Minimum Stable Drop Sizes, Break‐up Frequencies, and Size Distributions in Turbulent Dispersions

2005 ◽  
Vol 26 (4) ◽  
pp. 487-494 ◽  
Author(s):  
Gudret Kelbaliyev ◽  
Kadim Ceylan
Keyword(s):  
Size Distributions ◽  
Break Up ◽  
Turbulent Dispersions

Dynamic Break-Up and Drop Formation From a Liquid Jet Spun From a Rotating Orifice: Part I — Experimental

2003 ◽  
Author(s):  
David Wong ◽  
Mark Simmons ◽  
Andrew King ◽  
Stephen Decent ◽  
Emilian Parau
Keyword(s):  
Dynamic Viscosity ◽  
Rotation Rate ◽  
Nonlinear Effects ◽  
Size Distributions ◽  
Strong Function ◽  
Highly Nonlinear ◽  
Experimental Parameters ◽  
Break Up ◽  
Drop Size Distributions ◽  
Viscous Solutions

The dynamics of the break-up of curved jets produced by the prilling process were studied. The effects of liquid dynamic viscosity, rotation rate and orifice size upon the surface tension driven instabilities were investigated. Liquid dynamic viscosity was varied by using mixtures of glycerol and water which gave dynamic viscosities ranging from 0.001 to 0.081 Pa.s at 20°C. Over the range of experimental parameters studied, four different break-up modes were identified. For each mode, considerable differences in the break-up mechanism and in the drop size distributions produced were observed. Dimensional analysis has shown that the break-up modes can be predicted from a plot of Reynolds number against Weber number. The break-up mode observed is a strong function of viscosity and highly nonlinear effects were observed with the most viscous solutions used. The effect of rotation rate on the jet break-up length was inconclusive from the experiment.

Hydrodynamic conditioning of aluminium–bentonite flocs

2006 ◽  
Vol 6 (1) ◽  
pp. 11-19 ◽  
Author(s):  
C. Coufort ◽  
A. Liné
Keyword(s):  
Image Analysis ◽  
Size Distribution ◽  
High Sensitivity ◽  
Size Distributions ◽  
Hydrodynamic Stress ◽  
Floc Size ◽  
Micro Scale ◽  
Break Up ◽  
Floc Size Distributions

The aim of this paper is to analyse the role of hydrodynamics in flocculation. The effects of a hydrodynamic sequencing (flocculation–break-up–reflocculation–break-up–reflocculation) on the evolution of aluminium–bentonite floc size distributions and structure are investigated by image analysis in a Taylor–Couette reactor. The flocculation phenomena analysed in this study mainly occur in the viscous subrange, with floc size below the Kolmogorov micro-scale. The high sensitivity of steady-state floc size distribution to initial floc size distribution (elementary particles or flocs formed issuing break-up stages) is highlighted. Reversibility or irreversibility of agglomeration and break-up phenomena are discussed in terms of floc history and hydrodynamic stress. Finally, the hydrodynamic conditioning for aluminium–bentonite flocs is examined.

scholarly journals Post-main-sequence debris from rotation-induced YORP break-up of small bodies – II. Multiple fissions, internal strengths, and binary production

2019 ◽  
Vol 492 (2) ◽  
pp. 2437-2445 ◽  
Author(s):  
Dimitri Veras ◽  
Daniel J Scheeres
Keyword(s):  
Main Sequence ◽  
Planetary System ◽  
Size Distributions ◽  
Time Intervals ◽  
Small Bodies ◽  
Binary Asteroid ◽  
Yorp Effect ◽  
History Of ◽  
Break Up ◽  
Multiple Fissions

ABSTRACT Over one-quarter of white dwarfs contain observable metallic debris from the break-up of exo-asteroids. Understanding the physical and orbital history of this debris would enable us to self-consistently link planetary system formation and fate. One major debris reservoir is generated by YORP-induced rotational fission during the giant branch phases of stellar evolution, where the stellar luminosity can exceed the Sun’s by four orders of magnitude. Here, we determine the efficacy of the giant branch YORP effect for asteroids with non-zero internal strength, and model post-fission evolution by imposing simple analytic fragmentation prescriptions. We find that even the highest realistic internal strengths cannot prevent the widespread fragmentation of asteroids and the production of a debris field over 100 au in size. We compute the number of successive fission events as they occur in progressively smaller time intervals as the star ascends the giant branches, providing a way to generate size distributions of asteroid fragments. The results are highly insensitive to progenitor stellar mass. We also conclude that the ease with which giant branch YORP break-up can generate binary asteroid subsystems is strongly dependent on internal strength. Formed binary subsystems in turn could be short-lived due to the resulting luminosity-enhanced binary YORP (BYORP) effect.

Break-up dynamics and drop size distributions created from spiralling liquid jets

2004 ◽  
Vol 30 (5) ◽  
pp. 499-520 ◽  
Author(s):  
D.C.Y. Wong ◽  
M.J.H. Simmons ◽  
S.P. Decent ◽  
E.I. Parau ◽  
A.C. King
Keyword(s):  
Drop Size ◽  
Liquid Jets ◽  
Size Distributions ◽  
Break Up ◽  
Drop Size Distributions
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