Experimental Study of Evaporation of a Liquid Drop Containing Alumina Particles

1997 ◽  
Vol 24 (4-6) ◽  
pp. 735-745
Author(s):  
Izumi Taniguchi ◽  
N. Maeda ◽  
Koichi Asano
Keyword(s):  
Experimental Study ◽  
Liquid Drop ◽  
Alumina Particles

Equilibrium of liquid drops under the effects of rotation and acoustic flattening: results from USML-2 experiments in Space

1998 ◽  
Vol 354 ◽  
pp. 43-67 ◽  
Author(s):  
C. P. LEE ◽  
A. V. ANILKUMAR ◽  
A. B. HMELO ◽  
T. G. WANG
Keyword(s):  
Experimental Study ◽  
Angular Velocity ◽  
Liquid Drop ◽  
Sound Field ◽  
Theoretical Models ◽  
Liquid Drops ◽  
Complementary Effect ◽  
Rotating Liquid ◽  
Neutral Equilibrium ◽  
Effects Of Rotation

Previous Space-based experiments (Wang et al. 1994a) showed that a rotating liquid drop bifurcates into a two-lobed shape at a lower critical angular velocity, if it is flattened acoustically by the leviating sound field. In this work, we undertake a systematic experimental study of the effect of acoustic flattening on the rotational bifurcation of a liquid drop. We also look into the complementary effect of rotation on the equilibrium of an acoustically drastically flattened drop. Theoretical models are developed for each of the two effects and then woven into a unified picture. The first effect concerns neutral equilibrium, while the second concerns loss of equilibrium, neither of them involving instability. The theories agree well with the experiments.

Experimental study of the oscillations of a rotating drop

1985 ◽  
Vol 158 ◽  
pp. 317-327 ◽  
Author(s):  
P. Annamalai ◽  
E. Trinh ◽  
T. G. Wang
Keyword(s):  
Experimental Study ◽  
Analytical Study ◽  
Liquid Drop ◽  
Angular Speed ◽  
Immiscible Fluid ◽  
Drop Shape ◽  
Free Decay ◽  
Resonance Frequencies ◽  
Rotating Liquid ◽  
Relative Change

Two- and three-lobed oscillations of a rotating liquid drop immersed in an immiscible fluid of comparable density and the same angular velocity were studied experimentally. Using acoustically suspended drops, it has been found that the relative change in the resonance frequencies of the axisymmetric drop-shape oscillations Δωl/ωl(0) is proportional to the square of the normalized angular speed (Ω/ωl(0))2 when ωl > 2Ω. This is in agreement with a recent analytical study of the same problem. Some preliminary results regarding the effect of rotation on the free-decay rate of the two-lobed oscillations are also presented.

An Analytical and Experimental Study of Plasma Spraying of Alumina

1988 ◽  
Vol 121 ◽  
Author(s):  
D. J. Varacalle
Keyword(s):  
Experimental Study ◽  
Plasma Spraying ◽  
Numerical Models ◽  
Power Level ◽  
Hydrogen Gas ◽  
Physical Processes ◽  
Particle Injection ◽  
Alumina Particles ◽  
Temperature And Flow Fields

ABSTRACTAs part of an investigation of the dynamics that occur in the plume of a typical thermal spray torch, an analytical and experimental study of the plasma spraying of alumina is being performed; preliminary results are reported here. Numerical models of the physical processes in the torch column and plume were used to determine the temperature and flow fields. Computer simulations of particle injection (15, 34, and 53 μm alumina particles) are also presented. The alumina experiments were conducted at a 35 kW power level using a 100 scfh argon and 15 scfh hydrogen gas mixture for two alumina powders. The quality of the coatings is discussed with respect to porosity, sample metallography, and microhardness.

Impact of Drops on Various Non-Wetting Surfaces

2009 ◽  
Author(s):  
Philippe Brunet ◽  
Alain Merlen
Keyword(s):  
Experimental Study ◽  
Contact Angle ◽  
Thin Layer ◽  
Initial Velocity ◽  
Liquid Drop ◽  
Spray Cooling ◽  
Lateral Extension ◽  
Hot Plate ◽  
Boiling Crisis ◽  
Leidenfrost Effect

We have carried out an experimental study of liquid drop impact on various superhydrophobic substrates. Our surfaces are of two kinds (1) a carpet of chemically coated nanowires and (2) a smooth warm substrate. In the latter case, the Leidenfrost effect (also called ‘boiling crisis’) ensures the existence of a thin layer of air coming from the evaporation of the drop, thus preventing the drop to touch the warm surface. Technically, in this latter situation the contact angle can then be considered as equal to 180 degrees, with no hysteresis. Due to its initial inertia, the drop experiences a flattening phase after it hits the surface, taking the shape of a pancake. Once it reaches its maximal lateral extension, the drop begins to retract and bounces back. We have extracted the lateral extension of the drop, and we propose a model that explains the trend. We find a limit initial velocity beyond which the drop (1) protrudes into the nanowire carpet (2) touches the hot plate, provoking a local violent boiling. We discuss the relevance of practical issues in terms of self-cleaning surfaces or spray-cooling.

Experimental study of the aerosolization of fine alumina particles from bulk by a vortex shaker

2013 ◽  
Vol 246 ◽  
pp. 583-589 ◽  
Author(s):  
Martin Morgeneyer ◽  
Olivier Le Bihan ◽  
Aurélien Ustache ◽  
Olivier Aguerre-Chariol
Keyword(s):  
Experimental Study ◽  
Alumina Particles

Experimental study of liquid drop impact onto a powder surface

2010 ◽  
Vol 203 (2) ◽  
pp. 223-236 ◽  
Author(s):  
J.O. Marston ◽  
S.T. Thoroddsen ◽  
W.K. Ng ◽  
R.B.H. Tan
Keyword(s):  
Experimental Study ◽  
Liquid Drop ◽  
Drop Impact ◽  
Powder Surface

scholarly journals Experimental study on the premixed lean-burn in alumina particles based porous burner

2021 ◽  
Vol 7 ◽  
pp. 7434-7444
Author(s):  
Lei Li ◽  
Zhongguang Sun ◽  
Yongjiang Luo ◽  
Yunpei Liang ◽  
Xinyu Wang ◽  
...  
Keyword(s):  
Experimental Study ◽  
Lean Burn ◽  
Porous Burner ◽  
Alumina Particles

Thermal atomisation of a liquid drop after impact onto a hot substrate

2018 ◽  
Vol 842 ◽  
pp. 87-101 ◽  
Author(s):  
I. V. Roisman ◽  
J. Breitenbach ◽  
C. Tropea
Keyword(s):  
Experimental Study ◽  
Thermal Effects ◽  
Weber Number ◽  
Contact Time ◽  
Liquid Drop ◽  
Relevant Parameter ◽  
Complete Detachment ◽  
Regime Map ◽  
Dimensionless Heat Flux ◽  
Dimensionless Heat

This experimental study is focused on the mechanisms of thermal atomisation of a drop impacting onto a hot substrate. This phenomenon is characterised by the wetting and dewetting of the substrate, caused not by the rim dynamics, but induced by thermal effects. These thermal effects lead to the lamella evaporation, levitation and disintegration, generation of a vertical spray of fine droplets and consequently, drop breakup. A typical contact time of the drop before complete detachment is theoretically estimated. This estimation agrees very well with the experiments. It is shown that the Weber number, often used for describing splashing drops, is not a relevant parameter for thermal atomisation. Finally, a regime map is plotted, using a combination of the dimensionless contact time and the dimensionless heat flux at the substrate.

Sign in / Sign up

Export Citation Format

Share Document