Dilute polymer solution drops impacting on heated surfaces: New impact morphologies and impact regime maps

Lakhanpal, Chetan and Bertola, Volfango ORCID: 0000-0001-5357-6191 (2017) Dilute polymer solution drops impacting on heated surfaces: New impact morphologies and impact regime maps. In: ILASS2017 - 28th European Conference on Liquid Atomization and Spray Systems, 2017-9-6 - 2017-9-8, Valencia.

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Abstract

<jats:p>The impact morphology of dilute polymer solution drops on a heated surface is studied experimentally by meansof high-speed imaging, with respect to the following parameters: surface temperature; impact Weber number; polymer concentration; polymer molecular weight. In addition to impact morphologies observed in Newtonian drops (deposition, rebound, secondary atomisation and breakup/splashing), three new impact regimes have been identified: (i) a single satellite droplet ejected in the direction of bouncing but tethered to the main drop by a thin liquid filament; (ii) a splashing-like behaviour (semi-splashing), where the rim instability  generates  satellite droplets tethered to the lamella by thin liquid filaments; (iii) a spray-like behaviour (semi-spray), where a fine secondary atomisation generated upon impact is quickly absorbed back into the drop globule. Experiments were carried out using drops of aqueous polyethylene oxide (PEO) solutions, with mass concentrations of 100 ppm, 200 ppm and 400 ppm, and PEO molecular weights of 2 MDa, 4MDa, and 8MDa. The impact morphology on a polished aluminium surface with temperatures ranging between 160°C and 400°C was investigated for impact Weber numbers between 20 and 170, taking side view images of impacting drops at a rate of 1,000 frames persecond.DOI: http://dx.doi.org/10.4995/ILASS2017.2017.4905</jats:p>

Item Type:	Conference or Workshop Item (Unspecified)
Uncontrolled Keywords:	Drop Impact, Heated Surfaces, Polymer Solutions, Impact Regime Map
Depositing User:	Symplectic Admin
Date Deposited:	04 Sep 2017 08:19
Last Modified:	19 Jan 2023 06:56
DOI:	10.4995/ILASS2017.2017.6905
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3009267