An experimental study of cavity and Worthington jet formations caused by a falling sphere into an oil film on water

Jamali, Mohammad Vahid; Rostamijavanani, Abdolvahhab; Nouri, Mahtab; Navidbakhsh, Mahdi

doi:10.1016/j.apor.2020.102319

Cited by 26 publications

(6 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The jet is formed side biased as the flows on the upper part of the crown are not perfectly axisymmetric and they do not arrive at the merger point simultaneously, which is also consistent with one of the few available experimental observations in literature (Bisighini et al 2010;Murphy et al 2015;Lherm et al 2021). High-speed jet ejections out of a liquid interface are commonly observed in many other physical processes, such as bubble bursting (Boulton-Stone & Blake 1993;Thoroddsen et al 2009;Berny et al 2022), Faraday waves (Hogrefe et al 1998;Zeff et al 2000) and cavity collapse induced by the process of solid/liquid object impact onto fluid target (Worthington & Cole 1897, 1900Gekle & Gordillo 2010;Ray et al 2015;Jamali et al 2020;Kim et al 2021). In general, all these jets are ejected as a consequence of a very large axial pressure gradient created at the jet base, which therefore can be further classified based on the way the large overpressure is created and the length scale at which pressure variations take place (Gekle & Gordillo 2010).…”

Section: Formation Of Bubble Canopysupporting

confidence: 81%

Analysis of high-speed drop impact onto deep liquid pool

Wang,

Liu,

Bayeul-Lainé

et al. 2023

J. Fluid Mech.

View full text Add to dashboard Cite

The present work is devoted to the analysis of drop impact on a deep liquid pool, focusing on the high-energy splashing regimes caused by large raindrops at high velocities. Such cases are characterized by short time scales and complex mechanisms, thus they have received very little attention until now. The BASILISK open-source solver is used to perform three-dimensional direct numerical simulations. The capabilities of octree adaptive mesh refinement techniques enable capturing of the small-scale features of the flow, while the volume of fluid approach combined with a balanced-force surface-tension calculation is applied to advect the volume fraction of the liquids and reconstruct the interfaces. The numerical results compare well with experimental visualizations: both the evolution of crown and cavity, the emanation of ligaments, the formation of bubble canopy and the growth of a downward-moving spiral jet that pierces through the cavity bottom, are correctly reproduced. Reliable quantitative agreements are also obtained regarding the time evolution of rim positions, cavity dimensions and droplet distributions through an observation window. Furthermore, simulation gives access to various aspects of the internal flows, which allows us to better explain the observed physical phenomena. Details of the early-time dynamics of bubble ring entrapment and splashing performance, the formation/collapse of bubble canopy and the spreading of drop liquid are discussed. The statistics of droplet size show the bimodal distribution in time, corroborating distinct primary mechanisms of droplet production at different stages.

show abstract

Section: Formation Of Bubble Canopysupporting

confidence: 81%

Analysis of high-speed drop impact onto deep liquid pool

Wang,

Liu,

Bayeul-Lainé

et al. 2023

J. Fluid Mech.

View full text Add to dashboard Cite

show abstract

“…The next step in producing geometry is to meshing it [20], [21], [23]. The mesh generated for the calculations was performed by the Turbo Grid module of the Ansys software [24], [25] (Figure 3).…”

Section: Meshingmentioning

confidence: 99%

Design and Simulation of Radial Flow Turbine Impeller and Investigation Thermodynamic Properties of Flow in LE and TE

Aminjan¹,

Heidari²,

Rahmanivahid³

et al. 2021

TEM Journal

View full text Add to dashboard Cite

Centrifugal (radial flow) turbines are widely used in various industries, including power generation industries, so the study on them is of particular importance. The aim of this study was to investigate the thermodynamic properties of fluid flow in Trailing Edge (TE) and (LE) Leading Edge. For this purpose, first, the rotor (impeller) of the radial flow turbine was designed based on some design data such as flow rate, number of blades, rotational speed, diameter and length of the impeller, and then the designed rotor was simulated in 3D. The simulation done in the pressure based method and the turbulence model is SST and the rotational speed was 140,000(RPM). The results showed that the pressure, temperature and enthalpy in TE are less than LE and the areas close to the hub have the highest pressure. Another phenomenon observed is that in the section LE we see the separation of the flow from the blade surface, which then approaches the blade surface again and follows a relatively regular path,so the entropy in TE is greater than LE. At the end, the results of numerical solution were compared with valid data and the error rate and its reasons were discussed.

show abstract

“…Jamali et al studied the formation of air cavities and the worthington jet due to the falling sphere into an oil film formed on water using a high-speed camera. They observed that when a very thin layer of silicon oil was placed on the surface of the water, a large air cavity and a worthington jet were observed [17]. Zhou et al made an experimental investigation about the influence of airflow on droplet sizes.…”

Section: Introductionmentioning

confidence: 99%

Estimating Spray Characteristics of the Air-Blast atomizer of a Typical Jet Engine using Definition of the New Non-dimensional Number K: Numerical and Experimental Study

et al. 2022

View full text Add to dashboard Cite

In this paper, by using a numerical solution and experiment investigation, a non-dimensional number is introduced to estimate the characteristics of a real engine airblast atomizer spray. This type of atomizers is usually used in airplain engines. The test is conducted in ambient atmospheric pressure and at 300 K temperature and the effects of pressure on atomizer flow rate and spray con angle are investigated. We used the discrete phase model and real information of the ALF502 engine for simulations and for boundary conditions respectively. Since the main application of this airblast atomizer is in aircraft engines and in the real working conditions, none of the pressure and flow rate parameters is constant, thus, the main aim of this research is to define a nondimensional number K, which considers the effects of working liquid flow rate, air flow rate and pressure on the droplets average diameter and spray con angle simultaneously. The results showed that, in general, with the increase of non-dimensional K number, the average diameter of droplets in primary and secondary break up increases, but spray con angle decreases. Furthermore, numerical solution results are compared with experiment results and 9.98% error was observed.

show abstract

An experimental study of cavity and Worthington jet formations caused by a falling sphere into an oil film on water

Cited by 26 publications

References 37 publications

Analysis of high-speed drop impact onto deep liquid pool

Analysis of high-speed drop impact onto deep liquid pool

Design and Simulation of Radial Flow Turbine Impeller and Investigation Thermodynamic Properties of Flow in LE and TE

Estimating Spray Characteristics of the Air-Blast atomizer of a Typical Jet Engine using Definition of the New Non-dimensional Number K: Numerical and Experimental Study

Contact Info

Product

Resources

About