Optimum Positioning of Ports in the Limaçon Gas Expanders

2011 ◽  
Vol 133 (10) ◽  
Author(s):  
Ibrahim A. Sultan ◽  
Carl G. Schaller
Keyword(s):  
System Performance ◽  
Optimization Technique ◽  
Optimization Procedure ◽  
Operating Parameters ◽  
Phase Flow ◽  
Two Phase ◽  
Positive Displacement ◽  
Micropower Generation ◽  
Insight Into

Positive displacement expanders are quickly gaining popularity in the fields of micropower generation and refrigeration engineering. Unlike turbomachines, expanders can handle two-phase flow applications at low speed and flow rate levels. This paper is concerned with a simple-design positive displacement expander based on the limaçon of Pascal. The paper offers an insight into the thermodynamic workings of the limaçon gas expander and presents a mathematical model to describe the manner in which the port locations affect the expander performance. A stochastic optimization technique is adopted to find the locations, for the expander ports, which produce best expander performance for given chamber dimensions. The operating speed and other parameters will be held constant during the optimization procedure. A case study is offered in this paper to prove the validity of the presented approach, and comments are given on how various operating parameters affect system performance in the limaçon design.

scholarly journals Two-phase flow metering of heavy oil using a Coriolis mass flow meter: A case study

2006 ◽  
Vol 17 (6) ◽  
pp. 399-413 ◽  
Author(s):  
Manus Henry ◽  
Michael Tombs ◽  
Mihaela Duta ◽  
Feibiao Zhou ◽  
Ronaldo Mercado ◽  
...  
Keyword(s):  
Mass Flow ◽  
Heavy Oil ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Flow Meter ◽  
Two Phase ◽  
Flow Metering ◽  
Coriolis Mass Flow Meter

scholarly journals Development of a numerical workflow based on μ-CT-imaging for the determination of capillary pressure-saturation-specific interfacial area relationship in two-phase flow pore-scale porous media systems: A case study on Heletz sandstone

2016 ◽  
Author(s):  
Aaron Peche ◽  
Matthias Halisch ◽  
Alexandru Bogdan Tatomir
Keyword(s):  
High Resolution ◽  
Pore Size ◽  
Capillary Pressure ◽  
Two Phase Flow ◽  
Interfacial Area ◽  
Scale Model ◽  
Phase Flow ◽  
Pore Scale ◽  
Two Phase

Abstract. In this case study, we present the implementation of a FEM-based numerical pore-scale model that enables to track and quantify the propagating fluid-fluid interfacial area on highly complex μ-CT obtained geometries. Special focus is drawn to the reservoir specific capillary pressure (pc)- wetting phase saturation (Sw)- interfacial area (awn)- relationship. The basis of this approach are high resolution μ-CT images representing the geometrical characteristics of a georeservoir sample. The successfully validated two-phase flow model is based on the Navier-Stokes equations, including the surface tension force in order to consider capillary effects for the computation of flow and the phase field method for the emulation of a sharp fluid-fluid interface. In combination with specialized software packages, a complex high resolution modeling domain could be obtained. A numerical workflow based on REV-scale pore size distributions is introduced. This workflow aims at the successive modification of model and model setup for simulating such a type of two-phase problem on asymmetric μ-CT-based model domains. The geometrical complexity is gradually increased starting from idealized pore geometries until complex μ-CT-based pore network domains, whereas all domains represent geostatistics of the REV-scale core sample pore size distribution. Finally, the model could be applied on a complex μ-CT-based model domain and the pc-Sw-awn relationship could be computed.

Experimental Technique for Minimizing Resonance within a Ducted Fluid

1973 ◽  
Vol 15 (2) ◽  
pp. 95-101 ◽  
Author(s):  
E. W. Reed ◽  
K. F. Gill
Keyword(s):  
Binary Sequence ◽  
Phase Flow ◽  
Engineering Systems ◽  
Two Phase ◽  
Absolute Minimum ◽  
Control Applications ◽  
Pseudorandom Binary Sequence ◽  
Pipe System ◽  
Sonic Waves ◽  
Insight Into

Presented is an experimental method that enables practical pipe systems to be de-tuned so that resonance can be reduced to an absolute minimum. The technique employed is to correlate pseudorandom binary sequence pressure disturbances which are deliberately introduced into the pipe system. It is believed that this is the only method yet available to achieve this minimization of resonance phenomena. The experiment does not require fragile equipment and can be used in two phase flow work. The procedure is unsophisticated and directly applicable to engineering systems requiring this adjustment. The rapid response of the measuring technique makes the approach suitable for automatic control applications. Further extensions of this technique that give a greater insight into the practical behaviour of sonic waves are highlighted in the paper.

Two-Phase Flow CFD Simulations of Bubble Crystallization Tube

2012 ◽  
Vol 557-559 ◽  
pp. 2383-2387
Author(s):  
Peng Fei Zhang ◽  
Jian Long Hou ◽  
Ke Xue Fang
Keyword(s):  
Two Phase Flow ◽  
Operating Parameters ◽  
Phase Flow ◽  
Gas Velocity ◽  
Cfd Simulations ◽  
Two Phase ◽  
Inlet Velocity ◽  
Computing Platform ◽  
Multi Phase ◽  
Form Condition

At present, the studies of bubble crystallization focus on the gas velocity, crystallization efficiency and crystallization yield, the effects of other factors were not considered. So it is very important to study factors comprehensively that effect on the gas-liquid two-phase flow of bubble crystallization. In this paper, Fluent was used as a computing platform and RNG k-ε turbulence model and VOF multi-phase model was selected to simulate gas-liquid two-phase flow of bubble crystallization. The results show that as the gas inlet velocity increases, slug bubbles are more and more bigger, more and more dispersed bubbles are below the slug bubbles, crystallization efficiency first increases and then decreases; Under the gas pulse-inlet form condition, the better operating parameters are: gas velocity 1.0m/s, pulse duration 0.4s, interval time 0.8s, crystallization tube diameter 40mm. Simulations agree well with experimental data.

Performance of Positive Displacement Downhole Motors Under Two-phase Flow

1999 ◽  
Vol 38 (05) ◽  
Author(s):  
J. Li ◽  
R. Tudor ◽  
G. Sonego ◽  
B. Varcoe
Keyword(s):  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Positive Displacement

Performance of Positive Displacement Downhole Motors Under Two-phase Flow

10.2118/97-73 ◽  
1997 ◽  
Author(s):  
J. Li ◽  
R. Tudor ◽  
R. Sonego ◽  
B. Varcoe
Keyword(s):  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Positive Displacement

Optimizing Origami-Based Sheet Metal Parts Using Traversal Algorithms and Manufacturing Based Indices

2016 ◽  
Author(s):  
Ala Qattawi
Keyword(s):  
Sheet Metal ◽  
Optimization Technique ◽  
Sustainable Manufacturing ◽  
Optimization Procedure ◽  
Sheet Metal Parts ◽  
3D Geometry ◽  
Manufacturing Procedure ◽  
Metal Products ◽  
Manufacturing Alternatives

Origami-based sheet metal (OSM) folding techniques is a new emerging manufacturing procedure for sheet metal. In OSM the final part is folded into the desired 3D geometry using a sequence of folded bend lines. This process is enabled by creating material discontinues along the bend lines, either by laser cutting or by stamping. The objective of this paper is to optimize the design of OSM products while accounting for all possible flat patterns and accommodate manufacturing requirements for sheet metal products. OSM has an anticipated manufacturing benefits compared to traditional processes of sheet metal such as stamping; it requires minimal tooling and energy requirements thus is suitable for sustainable manufacturing alternatives. This paper discusses the implementation of optimization technique for OSM parts using a combination of traversal algorithm and manufacturing based indexes to reflect the requirements present in sheet metal industry. The outcomes of the optimization procedure resulted with topologically valid flat patterns with minimal scrap and wasted materials, in addition to minimal number of welded lines and fold line orientations in case of a robot effector is used to perform the fold. The work presented in this paper verified the validity of folding sheet metal using a single flat pattern into complex 3-D geometries from topological point view, in addition it highlights the major manufacturing concerns in folding sheet metal. This work also demonstrates a case study of optimizing a vehicular OSM part developed method.

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