Experimental study of two-phase flow pattern evolution in a horizontal circular tube of small diameter in laminar flow conditions

2013 ◽  
Vol 55 ◽  
pp. 99-110 ◽  
Author(s):  
S. Zeguai ◽  
S. Chikh ◽  
L. Tadrist
Keyword(s):  
Experimental Study ◽  
Laminar Flow ◽  
Flow Pattern ◽  
Two Phase Flow ◽  
Circular Tube ◽  
Small Diameter ◽  
Phase Flow ◽  
Flow Conditions ◽  
Two Phase ◽  
Laminar Flow Conditions

An Experimental Study on Air-Water Two-Phase Flow Patterns in Pebble Beds

2010 ◽  
Vol 132 (4) ◽  
Author(s):  
Bai Bofeng ◽  
Liu Maolong ◽  
Su Wang ◽  
Zhang Xiaojie
Keyword(s):  
Experimental Study ◽  
Flow Pattern ◽  
Test Section ◽  
Slug Flow ◽  
Annular Flow ◽  
Two Phase Flow ◽  
Flow Patterns ◽  
Phase Flow ◽  
Two Phase ◽  
Flow Pattern Transition

An experimental study was conducted on the air-water two-phase flow patterns in the bed of rectangular cross sections containing spheres of regular distribution. Three kinds of glass spheres with different diameters (3 mm, 6 mm, and 8 mm) were used for the establishment of the test section. By means of visual observations of the two-phase flow through the test section, it was discovered that five different flow patterns occurred within the experimental parameter ranges, namely, bubbly flow, bubbly-slug flow, slug flow, slug-annular flow, and annular flow. A correlation for the bubble and slug diameter in the packed beds was proposed, which was an extended expression of the Tung/Dhir model, Jamialahmadi’s model, and Schmidt’s model. Three correlations were proposed to calculate the void friction of the flow pattern transition in bubble flow, slug flow, and annular flow based on the bubble model in the pore region. The experimental result showed that the modified Tung and Dhir model of the flow pattern transition was in better agreement with the experimental data compared with Tung and Dhir’s model.

Influence of horizontal return bend on the two-phase flow pattern in small diameter tubes

2004 ◽  
Vol 28 (2-3) ◽  
pp. 145-152 ◽  
Author(s):  
Chi-Chung Wang ◽  
Ing Youn Chen ◽  
Yung-Wei Yang ◽  
Robert Hu
Keyword(s):  
Flow Pattern ◽  
Two Phase Flow ◽  
Small Diameter ◽  
Phase Flow ◽  
Two Phase

Experimental study on the flow pattern and pressure gradient of air-water two-phase flow in a horizontal circular mini-channel

2018 ◽  
Vol 31 (1) ◽  
pp. 102-116 ◽  
Author(s):  
Sudarja ◽  
Aqli Haq ◽  
Deendarlianto ◽  
Indarto ◽  
Adhika Widyaparaga
Keyword(s):  
Experimental Study ◽  
Pressure Gradient ◽  
Flow Pattern ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase

Steady and Dynamic Models of Fuel and Air Flow in Carburetors for Small Engines

2005 ◽  
Vol 127 (4) ◽  
pp. 778-786 ◽  
Author(s):  
Diego A. Arias ◽  
Timothy A. Shedd
Keyword(s):  
Dynamic Models ◽  
Two Phase Flow ◽  
Stokes Equations ◽  
Small Diameter ◽  
Phase Flow ◽  
Flow Conditions ◽  
Dynamic Flow ◽  
Complex Flow ◽  
Two Phase ◽  
Small Engines

This work presents the mathematical model of a complex flow network containing short metering orifices, compressible flow, and two-phase flow in small diameter pipes. It has been developed to study the steady and dynamic flows in a carburetor for small engines. It extends the previously published models by incorporating a detailed review of two-phase flow pressure drop, the effect of the fuel well on the control of air-bleed flow, and dynamic flow. The homogeneous two-phase flow model, which is commonly used in previous models, was compared to an empirical correlation derived from experiments in small pipes and found to be in poor agreement. In order to assess dynamic flow conditions, the model was extended by solving instantaneous one-dimensional Navier-Stokes equations in single-phase pipes. This strategy proved successful in explaining the mixture enrichment seen under pulsating flow conditions. The model was also used to derive a sensitivity analysis of geometries and physical properties of air and fuel.

MODELING OF THE MINIMIZED TWO-PHASE FLOW FRICTIONAL PRESSURE DROP IN A SMALL TUBE WITH DIFFERENT CORRELATIONS

2016 ◽  
Vol 78 (6-11) ◽  
Author(s):  
Qais Abid Yousif ◽  
Normah Mohd-Ghazali ◽  
Nor Atiqah Zolpakar ◽  
Sentot Novianto ◽  
Agus Sujiantro Pamitran ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Surface Roughness ◽  
Pressure Drop ◽  
Laminar Flow ◽  
Friction Factor ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Flow Conditions ◽  
Two Phase ◽  
Frictional Pressure Drop

The major parameters of interest in heat transfer research are the refrigerant charge, pressure drop, and heat transfer capacity. Smaller channels reduce the refrigerant charge with higher heat transfer capability due to the increased in surface area to volume ratio but at the expense of a higher pressure drop. Differences between the predicted and experimental frictional pressure drop of two-phase flow in small tubes have frequently been discussed. Factors that could have contributed to that effect have been attributed to the correlations used to model the flow, some being modified from the originals developed for a macro system. Experimental test-rigs have varied in channel geometry, refrigerant type, and flow conditions. Thousands of data have been collected to find a common point among the differences. This paper reports an investigation of four different two-phase friction factor correlations used in the modeling of the frictional two-phase flow pressure drop of refrigerant R-22. One had been specifically developed for laminar flow in a smooth channel, another was modified from a laminar flow in a smooth pipe to be used for a rough channel, and two correlations are specific for turbulent flow that consider internal pipe surface roughness. Genetic algorithm, an optimization scheme, is used to search for the minimum friction factor and minimum frictional pressure drop under optimized conditions of the mass flux and vapor quality. The results show that a larger pressure drop does come with a smaller channel. A large discrepancy exists between the correlations investigated; between the ones that does not consider surface roughness and that which does, as well as between flow under laminar and turbulent flow conditions.

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