Heat transfer during simultaneous impact of two drops onto a hot solid substrate

Batzdorf, Stefan; Breitenbach, Jan; Schlawitschek, Christiane; Roisman, Ilia V.; Stephan, Peter; Gambaryan‐Roisman, Tatiana

doi:10.1016/j.ijheatmasstransfer.2017.05.091

Cited by 48 publications

(15 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Roisman et al 19 proposed a remote asymptotic solution of two adjacent droplets impacting simultaneously [part (iv) of Figure 1a], and the influence of spacing (Δx) between these droplets is also highlighted in the formation of an uprising sheet after coalescence. Heat transfer from the substrate with a simultaneous impact of two droplets is also reported by Batzdorf et al 20 The overall heat transfer is high with larger spacing between these two droplets compared to smaller spacing due to larger contact area between droplet and substrate.…”

Section: Dropletssupporting

confidence: 67%

Drop-on-Drop Impact Dynamics on a Superhydrophobic Surface

Jaiswal

Khandekar

2021

Langmuir

View full text Add to dashboard Cite

Investigation of multiple droplet interactions is vital due to its importance in various applications, including sprays. In this context, the interaction of a sessile droplet (droplet #1) interaction with an oncoming droplet (droplet #2), in a vertically aligned, dropon-drop configuration, on a superhydrophobic surface is investigated, both experimentally and computationally. Three droplet impact regimes, with low We number of the impacting droplet (i.e., We droplet #2 ∼ 1.0) is observed, viz., gentle merging, late merging, and droplet bounce-off without merging. Complementary simulation of the gentle merging regime shows that a very high-pressure gradient is generated between the neck and the bulk region immediately after the contact, which acts as a driving force for the subsequent rapid evolution of the droplet shape. With a larger We number (We droplet #2 ∼ 8.2 and 14.8), there is always a unique outcome of the impact experiments. The two droplets merge, spread, recede, and bounce-off; there are multiple instances of rebound of the combined droplet mass from the surface. The estimated shear stress emanating during the impact and subsequent dynamics is large enough to cause deterioration of chemically coated superhydrophobic surfaces. The difference in the shape of moving droplet #2 at the instance of impact for We droplet #2 ∼ 1, as compared to We droplet #2 ∼ 8.2 and 14.8 is also highlighted. Important time scales during coalescence and beyond are the inertial-capillary time scale (∼16 ms) and viscous-capillary time scale (∼8 s). We also highlight the role of the droplet #1 deposition boundary condition, influence of the We number of droplet #2, and substrate wettability on drop-on-drop interactions, which has direct relevance to the transport mechanisms happening in various engineering applications like spraying pesticides, spray cooling, and rain interactions, etc.

show abstract

Section: Dropletssupporting

confidence: 67%

Drop-on-Drop Impact Dynamics on a Superhydrophobic Surface

Jaiswal

Khandekar

2021

Langmuir

View full text Add to dashboard Cite

show abstract

“…The effect of non-dimensional numbers on evaporation dynamics of drop-on-drop collision and theoretical model to evaluate the numerical findings was developed. Batzdorf et al [54] developed a numerical model and simulated simultaneous collisions of two drops with a solid substrate.…”

Section: Introductionmentioning

confidence: 99%

An experimental investigation into the spread and heat transfer dynamics of a train of two concentric impinging droplets over a heated surface

Guggilla

Narayanaswamy

Pattamatta

2020

Experimental Thermal and Fluid Science

View full text Add to dashboard Cite

“…Besides varying the impact parameters of drop size and impact velocity, also the influence of structured and porous substrates was investigated. Finally, experimental data for vertical and horizontal coalescing drops were collected for comparison with the accompanying numerical simulations [1,11]. An example measurement result of the time resolved impact of two drops captured with a side view camera and the associated computed heat flux distributed across the wetted area is shown in Fig.…”

Section: Droplet and Spray Interactions With Hot Wallsmentioning

confidence: 99%

Collaborative Research on Droplet Dynamics Under Extreme Ambient Conditions

Schulte

Dreizler

Munz

et al. 2022

Fluid Mechanics and Its Applications

Self Cite

View full text Add to dashboard Cite

A fundamental understanding of droplet dynamics is important for the prediction and optimization of technical systems involving drops and sprays. The Collaborative Research Center (CRC) SFB-TRR 75 was established in January 2010 to focus on the dynamics of basic drop processes, and in particular on processes involving extreme ambient conditions, for example near thermodynamic critical conditions, at very low temperatures, under the influence of strong electric fields, or in situations involving extreme gradients of the boundary conditions. The goal of the CRC was to gain a profound physical understanding of the essential processes, which is the basis for new analytical and numerical descriptions as well as for improved predictive capabilities. This joint initiative involved scientists at the University of Stuttgart, the TU Darmstadt, the TU Berlin, and the German Aerospace Center (DLR) in Lampoldshausen. This first chapter provides a brief overview of the overall structure of this CRC as well as a summary of some selected scientific achievements of the subprojects involved. For further details the reader is referred to the subsequent chapters of this book related to the individual subprojects.

show abstract

Heat transfer during simultaneous impact of two drops onto a hot solid substrate

Cited by 48 publications

References 38 publications

Drop-on-Drop Impact Dynamics on a Superhydrophobic Surface

Drop-on-Drop Impact Dynamics on a Superhydrophobic Surface

An experimental investigation into the spread and heat transfer dynamics of a train of two concentric impinging droplets over a heated surface

Collaborative Research on Droplet Dynamics Under Extreme Ambient Conditions

Contact Info

Product

Resources

About