Liquid hold-up, pressure gradient, and flow patterns in inclined gas-liquid pipe flow

1997 ◽  
Vol 15 (3) ◽  
pp. 174-182 ◽  
Author(s):  
Eric Grolman ◽  
Jan M.H. Fortuin
Keyword(s):  
Pressure Gradient ◽  
Pipe Flow ◽  
Flow Patterns

Understanding thermo-fluidic characteristics of a glass tube closed loop pulsating heat pipe: flow patterns and fluid oscillations

2015 ◽  
Vol 51 (12) ◽  
pp. 1669-1680 ◽  
Author(s):  
V. K. Karthikeyan ◽  
K. Ramachandran ◽  
B. C. Pillai ◽  
A. Brusly Solomon
Keyword(s):  
Heat Pipe ◽  
Pipe Flow ◽  
Closed Loop ◽  
Glass Tube ◽  
Flow Patterns ◽  
Pulsating Heat Pipe

scholarly journals FLOW PATTERNS OF THE ESTER OIL-REFRIGERANT R134A MIXTURE FLASHING FLOW THROUGH A SMALL DIAMETER TUBE

2008 ◽  
Vol 7 (1) ◽  
pp. 41
Author(s):  
H. O. S. Castro ◽  
J. L. Gasche ◽  
W. P. Conti ◽  
E. D. R. Vieira
Keyword(s):  
Pressure Gradient ◽  
Small Diameter ◽  
Flow Patterns ◽  
Foam Formation ◽  
Two Phase ◽  
Mixture Flow ◽  
Experimental Apparatus ◽  
Mass Fractions ◽  
Mass Flow Rates ◽  
Temperature And Pressure

This work presents an experimental investigation of the ester oil ISO VG10-refrigerant R134a mixture flashing flow with foam formation through a straight horizontal 3.22 mm-diameter-6.0 m- long tube. An experimental apparatus was designed to allow the measurement of both pressure and temperature profiles along the tube as well as the visualization of the flow patterns. Tests were performed at different mass flow rates, several refrigerant mass fractions at the inlet of the flow, and inlet mixture temperatures around 28 and 39 °C. A liquid mixture flow with constant temperature and pressure gradient could be noticed at the inlet of the tube. As the flow proceeded towards the exit of the tube the pressure drop produced a reduction of the refrigerant solubility in the oil yielding to formation of the first bubbles. Initially, small and few bubbles could be noticed and the flow behaved as a conventional two-phase flow. Eventually, the bubble population increased and foam flow was observed at the exit of the tube. Due to the great formation of bubbles, both the temperature and pressure gradient of the mixture were greatly reduced in this region of the flow.

Unified Model for Gas-Liquid Pipe Flow Via Slug Dynamics: Part 1 — Model Development

2002 ◽  
Author(s):  
Hong-Quan Zhang ◽  
Qian Wang ◽  
Cem Sarica ◽  
James P. Brill
Keyword(s):  
Flow Pattern ◽  
Pipe Flow ◽  
Slug Flow ◽  
Control Volume ◽  
Model Development ◽  
Flow Patterns ◽  
Hydrodynamic Characteristics ◽  
Momentum Exchange ◽  
Two Phase ◽  
Inclination Angles

A unified hydrodynamic model is developed for predictions of flow pattern transitions, pressure gradient, liquid holdup and slug characteristics in gas-liquid pipe flow at different inclination angles from −90 to 90 deg. The model is based on the dynamics of slug flow, which shares transition boundaries with all the other flow patterns. By use of the entire film zone as the control volume, the momentum exchange between the slug body and the film zone is introduced into the momentum equations for slug flow. The equations of slug flow are used not only to calculate the slug characteristics, but also to predict transitions from slug flow to other flow patterns. Significant effort has been made to eliminate discontinuities among the closure relationships through careful selection and generalization. The flow pattern classification is also simplified according to the hydrodynamic characteristics of two-phase flow.

scholarly journals Flow Patterns and Frictional Losses in an Oscillating Pipe Flow

1982 ◽  
Vol 25 (202) ◽  
pp. 536-543 ◽  
Author(s):  
Munekazu OHMI ◽  
Manabu IGUCHI ◽  
Ikuo URAHATA
Keyword(s):  
Pipe Flow ◽  
Flow Patterns ◽  
Frictional Losses

Transient Boundary Layers Between Porous Plates

1976 ◽  
Vol 43 (4) ◽  
pp. 555-558 ◽  
Author(s):  
W. A. Fiveland ◽  
P.-C. Lu
Keyword(s):  
Laminar Flow ◽  
Pressure Gradient ◽  
Incompressible Fluid ◽  
Boundary Layers ◽  
Parallel Plate ◽  
Flow Patterns ◽  
Numerical Results ◽  
Sine Transform ◽  
Fourier Sine Transform ◽  
Plate Channel

Analysis is made of a transient, fully developed, laminar flow of an incompressible fluid in a porous, parallel-plate channel. The crossflow through the plates is uniform, but is allowed to vary with time. In addition to a pressure gradient due to pumping, the flow is also under the inducement of the motion of one of the plates. Numerical results are obtained through the (final or nonfinal) use of the finite Fourier sine transform. Asymptotic flow patterns showing transient boundary layers are investigated. Finally, the formation of the flow from the start is described in physical terms.

scholarly journals Downstream relaxation of velocity profiles in pipe-flow with swirl disturbances

2016 ◽  
Vol 83 (12) ◽  
Author(s):  
Simon Graner ◽  
Denis F. Hinz ◽  
Christian Breitsamter
Keyword(s):  
Cross Sections ◽  
Pipe Flow ◽  
Performance Indicators ◽  
Laser Doppler Velocimetry ◽  
Swirling Flow ◽  
Flow Patterns ◽  
Velocity Profiles ◽  
Doppler Velocimetry ◽  
Characteristic Shape ◽  
And Performance

AbstractWe study characteristic flow patterns downstream of a standardized swirl disturbance generator using laser-Doppler velocimetry (LDV). To investigate the spatial development of flow patterns, we conduct LDV measurements in cross-sections located at various distances downstream from the swirl disturbance generator. Focusing on velocity profiles, decay of swirl, and performance indicators used to describe the characteristic shape of the velocity profiles, we systematically compare the experimental results with available references and various theories for decay of swirl disturbances. We find that the standardized swirl disturbance generator provides exponentially decaying swirling flow that is best captured by the theory of Steenbergen and Voskamp

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