Flow over a mesoscale ridge: pathways to regime transition

1995 ◽  
Vol 47 (4) ◽  
pp. 502-524 ◽  
Author(s):  
J. Trüb ◽  
H.C. Davies
Keyword(s):  
Regime Transition

scholarly journals Trickle/pulse flow regime transition in downflow packed tower involving foaming liquids

2012 ◽  
Vol 18 (3) ◽  
pp. 349-359
Author(s):  
Vijay Sodhi
Keyword(s):  
Surface Tension ◽  
Liquid Flow ◽  
Liquid Surface ◽  
Regime Transition ◽  
Pulse Flow ◽  
Packed Tower ◽  
Flow Rates ◽  
Transition Boundary ◽  
Liquid Surface Tension ◽  
Pulsing Flow

The most of past studies in foaming trickle bed reactors aimed at the improvement of efficiency and operational parameters leads to high economic advantages. Conventionally most of the industries rely on frequently used gas continuous flow (GCF) where operational output is satisfactory but not yields efficiently as in pulsing flow (PF) and foaming pulsing flow (FPF). Hydrodynamic characteristics like regime transitions are significantly influenced by foaming nature of liquid as well as gas and liquid flow rates. This study?s aim was to demonstrate experimentally the effects of liquid flow rate, gas flow rates and liquid surface tension on regime transition. These parameters were analyzed for the air-aqueous Sodium Lauryl Sulphate and air-water systems. More than 240 experiments were done to obtain the transition boundary for trickle flow (GCF) to foaming pulsing flow (PF/FPF) by use excessive foaming 15-60 ppm surfactant compositions. The trickle to pulse flow transition appeared at lower gas and liquid flow rates with decrease in liquid surface tension. All experimental data had been collected and drawn in the form of four different transitional plots which are compared and drawn by using flow coordinates proposed by different researchers. A prominent decrease in dynamic liquid saturation was observed especially during regime transitional change. The reactor two phase pressure evident a sharp rise to verify the regime transition shift from GCF to PF/FPF. Present study reveals, the regime transition boundary significantly influenced by any change in hydrodynamic as well as physiochemical properties including surface tension.

Low Bond Number Two-Phase Flow Regime Transition from Slug to Annular Wavy Flow in a Microchannel

2003 ◽  
Vol 125 (4) ◽  
pp. 544-544 ◽  
Author(s):  
Sang Young Son ◽  
Jeffrey S. Allen ◽  
Kenneth O. Kihm
Keyword(s):  
Flow Regime ◽  
Two Phase Flow ◽  
Bond Number ◽  
Phase Flow ◽  
Regime Transition ◽  
Two Phase ◽  
Flow Regime Transition

Levitsky and Way and Competitive Authoritarianism: Leverage, Linkage and Organisational Power

2016 ◽  
Author(s):  
J.N.C. Hill
Keyword(s):  
The State ◽  
Regime Transition ◽  
Fourth Section ◽  
Competitive Authoritarianism ◽  
The Third

This chapter charts and explains Steven Levitsky and Lucan Way’s celebrated model for explaining regime transition. It is divided into four sections. The first provides an overview of the dimensions of leverage, linkage and organisational power focusing, in particular, on the inter-play between them; how the strength of one renders the others more or less important. The second section examines the dimension of leverage – the principal ways in which it is exercised and how it is quantified – and defines a Black Knight patron (what a state or regime must do to qualify as one). The third section examines the dimension of linkage; the main forms it takes and how its strength is measured and categorised. And the fourth section examines organisational power; the state and other structures on which it is based.

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