Probing soap-film friction with two-phase foam flow

2008 ◽  
Vol 88 (9-10) ◽  
pp. 679-691 ◽  
Author(s):  
Ariel I. Balter ◽  
James A. Glazier ◽  
Rebecca Perry
Keyword(s):  
Soap Film ◽  
Two Phase ◽  
Foam Flow

Experimental Study of Particle Size, Sound Velocity, and Resonance Phenomena in a Two-Phase Foam Flow

2001 ◽  
Vol 32 (4-6) ◽  
pp. 5
Author(s):  
A. P. Sevast'yanov ◽  
I. V. An ◽  
S. I. Vainshtein ◽  
Yu. A. Sevast'yanov ◽  
A. V. Sidnev ◽  
...  
Keyword(s):  
Experimental Study ◽  
Particle Size ◽  
Sound Velocity ◽  
Two Phase ◽  
Foam Flow ◽  
Resonance Phenomena

scholarly journals Propagation of Pressure Wave in Two Phase Flow : 2nd Report, Foam Flow

1976 ◽  
Vol 42 (355) ◽  
pp. 877-884
Author(s):  
Yasuo MORI ◽  
Kunio HIJIKATA ◽  
Takao OHMORI
Keyword(s):  
Pressure Wave ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Foam Flow

Study of Foam Flow in a Gas-Liquid Cylindrical Cyclone (GLCC) Compact Separator

2009 ◽  
Author(s):  
No´lides M. Guzma´n ◽  
Ovadia Shoham ◽  
Ram Mohan
Keyword(s):  
Experimental Data ◽  
Flow Behavior ◽  
Two Phase ◽  
Operational Conditions ◽  
Foam Flow ◽  
Aqueous Foam ◽  
Flow Characterization ◽  
Cylindrical Cyclone ◽  
Static Trap ◽  
Break Up

Aqueous foam flow behavior in a Gas-Liquid Cylindrical Cyclone (GLCC) is studied experimentally and theoretically with the objective of determine the operational envelop for foam break up. An existing experimental two-phase facility was modified to enable foam flow characterization. Several experimental data were acquired for aqueous foam using a compact inlet cyclone. These include: foam characterization in static trap sections, and foam flow behavior in the cyclone. Saint-Jalmes et al. (2000) model has been modified for characterization of foam evolution in static trap sections including the prediction of the drainage interface height with time. In addition, a new model for the prediction of the operational envelop for foam break up in the cyclone based on foam characteristics was developed. Good agreement is observed between the experimental data and the predictions of the models. It can be concluded that depending on the operational conditions the GLCC can act either as a foam breaker or as a foam generator. The developed model for the prediction of the operational envelop for foam break up separates these two modes of operations of the GLCC.

On Formation of a Homogeneous Two-Phase Foam Flow

1980 ◽  
Vol 102 (4) ◽  
pp. 820-826 ◽  
Author(s):  
G. Fabris ◽  
J. C. F. Chow ◽  
P. F. Dunn
Keyword(s):  
Flow Visualization ◽  
Mechanical Performance ◽  
Two Phase Flows ◽  
Two Phase ◽  
Foam Flow ◽  
Mixer Design ◽  
Local Measurements ◽  
Series Of Experiments ◽  
Small Bubbles

This paper presents the results of a series of experiments conducted to evaluate the fluid mechanical performance of various two-phase LMMHD mixer designs. The results from both flow visualization studies of the local two-phase flows downstream from various mixer-element configurations and local measurements performed to characterize these flows are presented. A conceptual LMMHD mixer design is described that insures the generation of small bubbles, prevents the formation of gas slugs and separated regions, and favors the stabilization of a homogeneous foam flow.

scholarly journals Liquid Water Transport in Porous Metal Foam Flow-Field Fuel Cells: A Two-Phase Numerical Modelling and Ex-Situ Experimental Study

Energies ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1186 ◽  
Author(s):  
Ashley Fly ◽  
Kyoungyoun Kim ◽  
John Gordon ◽  
Daniel Butcher ◽  
Rui Chen
Keyword(s):  
Flow Field ◽  
Pore Size ◽  
Flow Rate ◽  
Liquid Water ◽  
Metal Foam ◽  
Porous Metal ◽  
Ex Situ ◽  
Air Flow Rate ◽  
Two Phase ◽  
Foam Flow

Proton exchange membrane fuel cells (PEMFCs) using porous metallic foam flow-field plates have been demonstrated as an alternative to conventional rib and channel designs, showing high performance at high currents. However, the transport of liquid product water through metal foam flow-field plates in PEMFC conditions is not well understood, especially at the individual pore level. In this work, ex-situ experiments are conducted to visualise liquid water movement within a metal foam flow-field plate, considering hydrophobicity, foam pore size and air flow rate. A two-phase numerical model is then developed to further investigate the fundamental water transport behaviour in porous metal foam flow-field plates. Both the experimental and numerical work demonstrate that unlike conventional PEMFC channels, air flow rate does not have a strong influence on water removal due to the high surface tensions between the water and foam pore ligaments. A hydrophobic foam was seen to transport liquid water away from the initial injection point faster than a hydrophilic foam. In ex-situ tests, liquid water forms and maintains a random preferential pathway until the flow-field edge is reached. These results suggest that controlled foam hydrophobicity and pore size is the best way of managing water distribution in PEMFCs with porous flow-field plates.

scholarly journals ANALYSIS OF TUBE BUNDLE HEAT TRANSFER TO VERTICAL FOAM FLOW

2005 ◽  
Vol 4 (2) ◽  
Author(s):  
J. Gylys ◽  
S. Sinkunas ◽  
T. Zdankus
Keyword(s):  
Heat Transfer ◽  
Tube Bundle ◽  
Vertical Channel ◽  
Horizontal Tube ◽  
Heat Transfer Process ◽  
Two Phase ◽  
Stable Foam ◽  
Foam Flow ◽  
Experimental Heat ◽  
Structure Changes

Phenomena of foam flow and associated heat transfer are rather complex. Foam is a two–phase flow, which structure changes while it passes an obstacle: bubbles divide into smaller bubbles and liquid drains down from flow. Due to these peculiarities, an application of analytical methods for their study is a complex subject. Thus experimental method of investigation was selected in our work. The investigation apparatus consisted of foam generator, vertical channel and staggered bank of horizontal tubes. The cross section of the channel had square profile with side dimension 140 mm. Tubes in the bank were located in three vertical rows with five tubes in each of them. Experiments were performed within Reynolds number diapason for gas from 190 to 450 and foam void volumetric fraction – from 0.996 to 0.998. Direction of foam motion in vertical channels also influences heat transfer intensity. Investigations of heat transfer process of upward and downward moving statically stable foam flow from horizontal tube bank were performed. Experimental heat transfer results of tube bundle in vertical cross foam flow were summarized by criterion equations, which enable determination of heat transfer intensity of the entire bundle or of a separate tube of the bundle for different values of void volumetric fractions and regime parameters of statically stable foam flow.

scholarly journals ANALYSIS OF TUBE BUNDLE HEAT TRANSFER TO VERTICAL FOAM FLOW

2005 ◽  
Vol 4 (2) ◽  
pp. 91 ◽  
Author(s):  
J. Gylys ◽  
S. Sinkunas ◽  
T. Zdankus
Keyword(s):  
Heat Transfer ◽  
Tube Bundle ◽  
Vertical Channel ◽  
Horizontal Tube ◽  
Heat Transfer Process ◽  
Two Phase ◽  
Stable Foam ◽  
Foam Flow ◽  
Experimental Heat ◽  
Structure Changes

Phenomena of foam flow and associated heat transfer are rather complex. Foam is a two–phase flow, which structure changes while it passes an obstacle: bubbles divide into smaller bubbles and liquid drains down from flow. Due to these peculiarities, an application of analytical methods for their study is a complex subject. Thus experimental method of investigation was selected in our work. The investigation apparatus consisted of foam generator, vertical channel and staggered bank of horizontal tubes. The cross section of the channel had square profile with side dimension 140 mm. Tubes in the bank were located in three vertical rows with five tubes in each of them. Experiments were performed within Reynolds number diapason for gas from 190 to 450 and foam void volumetric fraction – from 0.996 to 0.998. Direction of foam motion in vertical channels also influences heat transfer intensity. Investigations of heat transfer process of upward and downward moving statically stable foam flow from horizontal tube bank were performed. Experimental heat transfer results of tube bundle in vertical cross foam flow were summarized by criterion equations, which enable determination of heat transfer intensity of the entire bundle or of a separate tube of the bundle for different values of void volumetric fractions and regime parameters of statically stable foam flow.

Effect of Shock Loading on the Microstructure of Uniloy 326

1974 ◽  
Vol 32 ◽  
pp. 504-505
Author(s):  
K. P. Staudhammer ◽  
L. E. Murr
Keyword(s):  
Grain Size ◽  
Shock Loading ◽  
Current Investigation ◽  
Two Phase ◽  
05 C ◽  
Shock Deformation ◽  
Heat Treated

The effect of shock loading on a variety of steels has been reviewed recently by Leslie. It is generally observed that significant changes in microstructure and microhardness are produced by explosive shock deformation. While the effect of shock loading on austenitic, ferritic, martensitic, and pearlitic structures has been investigated, there have been no systematic studies of the shock-loading of microduplex structures.In the current investigation, the shock-loading response of millrolled and heat-treated Uniloy 326 (thickness 60 mil) having a residual grain size of 1 to 2μ before shock loading was studied. Uniloy 326 is a two phase (microduplex) alloy consisting of 30% austenite (γ) in a ferrite (α) matrix; with the composition.3% Ti, 1% Mn, .6% Si,.05% C, 6% Ni, 26% Cr, balance Fe.

Exsolution and inversion in pigeonite from the Whin Sill, Northern England

1978 ◽  
Vol 36 (1) ◽  
pp. 474-475
Author(s):  
P.P.K. Smith
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Homogeneous Nucleation ◽  
Silicate Mineral ◽  
Antiphase Boundaries ◽  
Two Phase ◽  
Primitive Form ◽  
The Core ◽  
Nucleation Mechanisms ◽  
And Inversion

Grains of pigeonite, a calcium-poor silicate mineral of the pyroxene group, from the Whin Sill dolerite have been ion-thinned and examined by TEM. The pigeonite is strongly zoned chemically from the composition Wo8En64FS28 in the core to Wo13En34FS53 at the rim. Two phase transformations have occurred during the cooling of this pigeonite:- exsolution of augite, a more calcic pyroxene, and inversion of the pigeonite from the high- temperature C face-centred form to the low-temperature primitive form, with the formation of antiphase boundaries (APB's). Different sequences of these exsolution and inversion reactions, together with different nucleation mechanisms of the augite, have created three distinct microstructures depending on the position in the grain.In the core of the grains small platelets of augite about 0.02μm thick have farmed parallel to the (001) plane (Fig. 1). These are thought to have exsolved by homogeneous nucleation. Subsequently the inversion of the pigeonite has led to the creation of APB's.

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