Abstract

Influence of lubricant addition on dynamics of a single drop impacting onto a very hot substrate

Highlights

  • Single drop impact onto a hot surface occurs frequently over a broad range of applications in numerous industrial sectors

  • We show that the residence time of the lubricant containing drop is proportional to the corresponding time of the pure liquid, which indicates that generally the dynamics of drop impact is very similar

  • These regimes are similar to the regimes of drop impact of pure liquids

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Summary

Introduction

Single drop impact onto a hot surface occurs frequently over a broad range of applications in numerous industrial sectors. Many phenomena accompanying the impact of a pure water drop onto a hot substrate have already been scrutinized in literature [7,8,9,10,11], including thermodynamic boiling phenomena (e.g. single phase cooling, nucleate boiling, transitional boiling and film boiling) and different impact outcomes (e.g. deposition, rebound, breakup). Outcome descriptions of drop impact onto a hot surfaces can be found for example in [12, 13] To characterize such impacts some additional parameters are frequently measured and observed, in particular the residence time of the drop liquid on the substrate [14]. The main objective of the present experimental study is the examination of the influence of graphite based industrial lubricants on the drop residence time and drop impact regimes during the interaction between graphite-water drops with a heated substrate. This effect can be explained by the influence of the dispersed phase on the effective thermal properties of the liquids and by the formation of a deposited layer of the solid particles of the lubricant, which influences the intensity of heat transfer

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