Journal ArticleDOI
Normal droplet impact on horizontal moving films: an investigation of impact behaviour and regimes
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TLDR
In this article, the impact regimes for a liquid droplet impacting onto horizontal moving liquid films are investigated for the first time, and the main impact outcomes are shown to undergo a transition as the Reynolds number of the moving film increases, this occurs at a threshold value close to the expected transition between laminar and turbulent flow.Abstract:
Investigations of the impact regimes for a liquid droplet impacting onto horizontal moving liquid films are presented here for the first time. The aim of this study is to show the main impact outcomes and to highlight the effect the movement of films has upon these outcomes. The droplet diameters used in this experiment were 2.47 and 3.86 mm with impact Weber number of between 0.6 and 460. The Reynolds number of the moving film was between 351 and 1,818 depending on the flow rate (1–5.5 L/min) with changes in the film height of between 4.3 and 9.4 mm. The results showed that the impact outcomes exhibit the same regimes established for the impact on static liquids but with different transition boundaries. Moreover, the shape of the impact outcomes is unsymmetrical similar to the inclined impact on static liquids. The impact outcomes are shown to undergo a transition as the Reynolds number of the film increases, this occurs at a threshold value close to the expected transition between laminar and turbulent flow.read more
Citations
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Journal ArticleDOI
Review of mass and momentum interactions during drop impact on a liquid film
TL;DR: In this paper, the mass and momentum interactions during drop impact on a liquid film are discussed in terms of underlying physical mechanisms and predictive correlations and/or models, and it is shown that much uncertainty remains, especially in regards to the interfacial features around the drop-film neck region during the earliest stages of the impact.
Journal ArticleDOI
A numerical study on splash of oblique drop impact on wet walls
TL;DR: In this article, the impact of a liquid drop onto a wet solid wall with a moderate Weber number is simulated numerically by using a two-phase flow lattice Boltzmann model.
Journal ArticleDOI
Crown behavior and bubble entrainment during a drop impact on a liquid film
TL;DR: In this paper, the authors established physical and mathematical models to simulate a single liquid drop impinging onto a liquid film using the coupled level set and volume of fluid method, and the crown liquid sheet after impact was obtained, which coincides well with the experimental results in literatures.
Journal ArticleDOI
Rebound and spreading during a drop impact on wetted cylinders
TL;DR: In this paper, the Weber number and the Ohnesorge number were used to predict the rebound and spreading of a single drop impact on wetted cylindrical surfaces with a high speed digital camera at 10,000 frames per second.
Journal ArticleDOI
Heat transfer of single drop impact on a film flow cooling a hot surface
TL;DR: In this article, a water drop impacts a thin heated wafer which is being cooled by a film flow generated from water jet impingement, and the drop impact breaks the steady-state cooling and causes the local temperature around the drop landing location to change.
References
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Book
Digital Image Processing Using MATLAB
TL;DR: 1. Fundamentals of Image Processing, 2. Intensity Transformations and Spatial Filtering, and 3. Frequency Domain Processing.
Journal ArticleDOI
Drop Impact Dynamics: Splashing, Spreading, Receding, Bouncing ...
TL;DR: In this article, a review deals with drop impacts on thin liquid layers and dry surfaces, referred to as splashing, and their propagation is discussed in detail, as well as some additional kindred, albeit nonsplashing, phenomena like drop spreading and deposition, receding (recoil), jetting, fingering, and rebound.
Journal ArticleDOI
Phenomena of liquid drop impact on solid and liquid surfaces
TL;DR: The fluid dynamic phenomena of liquid drop impact are described and reviewed in this article, and specific conditions under which the above phenomena did occur in experiments are analyzed and the characteristics of drop impact phenomena are described in detail.
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Droplet-wall collisions: Experimental studies of the deformation and breakup process
TL;DR: In this article, a model of the deposition-splashing boundary in terms of Reynolds number and Ohnesorge number is presented, which is only achieved if the normal velocity component of the impinging droplets is used in these dimensionless numbers.
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Open-Channel Flow
TL;DR: Open-Channel Flow, Second Edition is written for students in senior-level undergraduate and graduate courses on steady and unsteady open-channel flow and for civil engineers needing up-to-date and relevant information on the latest developments and techniques in the field.