Elaborated models such as those used for simulation purposes (e.g. OLGA simulator) cannot be used for model-based control design. The focus of this paper is on deriving simple dynamical models with few state variables that capture the essential behaviour for control. We propose a new simplified dynamic model for severe slugging flow in pipeline-riser systems. The proposed model, together with f...

Anti-slug control applied to two-phase flow provides a very challenging and important application for feedback control. It is important because it allows for operation that would otherwise be impossible, and challenging because of the presence of both RHP-poles and RHP-zeros. To conduct experiments on pipeline-riser anti-slug control, a small-scale slug-loop has been build. The loop has been mo...

Abstract In this study, the dynamics of tendon/top tension riser (TTR) system a tension-leg platform (TLP) are investigated through an experiment and by using absolute nodal coordinate formulation (ANCF). First, model test TLP is conducted in water tank Harbin Engineering University to examine motion response dynamic characteristics tendon TTR. The scale ratio set 1: 66.3. Then, on basis ANCF, ...

In view of the current status catalytic cracking flue gas treatment, it is necessary to study flow environment desulfurization ash particles, which are a type Geldart C particle, in circulating fluidized bed (CFB) for semi-dry desulphurization using CFB technology. This investigated characteristics particles riser with an inner diameter 70 mm and height 12.6 m, at velocity 4–7 m/s solids circul...

In the present study, the influence of superficial gas velocity and fluid properties on gas holdup and liquid circulation velocity in a three-phase external loop airlift column using polystyrene (0.0036 m diameter and 1025.55 kg/m density) and nylon-6 (0.0035 m diameter and 1084.24 kg/m density) particles with aqueous solutions of alcohols (isoamyl alcohol and propanol) as liquids were investig...

The mission of RISER (Research Institute on Secondary Education Reform for Youth with Disabilities) is to expand the current knowledge base related to practices and policies in secondary schools that enhance learning, achievement, and postschool outcomes for all students. Transition practices related to career development are an important aspect of secondary education reform (Hanley-Maxwell, Ph...

A suitable initial point for understanding multiphase flows is a phenomenological description of the mechanism geometric distributions or flow patterns that are observed. The challenge however prediction combination operating conditions and characteristics phases as well points transition from one pattern to other. Different occur in different pipeline configurations which U-shape risers part. ...

As the solidification reaches hot spot area, no molten metal remains and shrinkage is formed. To anticipate shrinkage, a riser added to casting system. An optimal design would produce free components. One of factors that affect efficiency shape. This study aims find most efficient side shape by using simulation software. The tubes, tubes with half sphere on top, hemispheres, conical an oval cro...

Marine risers transporting unsteady multiphase flows may experience internal flow-induced vibrations depending on several flow-structure parameters. This study presents an experimental investigation of large-amplitude intermittent inclined bendable riser air-water flow that exhibits slug pattern. The has initial catenary profile with a length over diameter about 320. By using non-intrusive meas...

Krassimir Atanassov1, Gabriella Pasi2, Ronald Yager3, and Vassia Atanassova4 1 CLBME Bulg. Academy of Sci., P.O.Box 12, Sofia-1113, Bulgaria, [email protected] 2 ITC-CNR, Via Ampère 56, 20131 Milano, Italy, [email protected] 3 Machine Intelligence Institute, Iona College, New Rochelle, NY 10801, USA, [email protected] 4 Faculty of Mathematics and Computer Science, Sofia University, V assia...