Droplet Evaporation Dynamics of Low Surface Tension Fluids Using the Steady Method

Droplet Evaporation Dynamics of Low Surface Tension Fluids Using the Steady Method

Droplet evaporation governs many heat- and mass-transfer processes germane in nature and industry. In the past 3 centuries, transient techniques have been developed to characterize the evaporation of sessile droplets. These methods have difficulty in reconciling transient effects induced by the drop...

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Veröffentlicht in:Langmuir 2020-11, Vol.36 (46), p.13860-13871
Hauptverfasser: Günay, A. Alperen, Gnadt, Marisa, Sett, Soumyadip, Vahabi, Hamed, Kota, Arun K, Miljkovic, Nenad
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container_end_page 13871
container_issue 46
container_start_page 13860
container_title Langmuir
container_volume 36
creator Günay, A. Alperen
Gnadt, Marisa
Sett, Soumyadip
Vahabi, Hamed
Kota, Arun K
Miljkovic, Nenad
description Droplet evaporation governs many heat- and mass-transfer processes germane in nature and industry. In the past 3 centuries, transient techniques have been developed to characterize the evaporation of sessile droplets. These methods have difficulty in reconciling transient effects induced by the droplet shape and size changes during evaporation. Furthermore, investigation of evaporation of microdroplets residing on wetting substrates, or fluids having low surface tensions (
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We start by employing the steady method to benchmark with water droplets having base radii (20 ≤ R b ≤ 260 μm), apparent advancing contact angle (45° ≤ θa,app ≤ 162°), surface temperature (30 < T s < 60 °C), and relative humidity (40% < ϕ < 60%). Following validation, evaporation of ethanol (≈22 mN/m), hexane (≈18 mN/m), and dodecane (≈25 mN/m) were studied for 90 ≤ R b ≤ 400 μm and 10 < T s < 25 °C. We elucidate the mechanisms governing the observed behavior using heat and mass transport scaling analysis during evaporation, demonstrating our steady technique to be particularly advantageous for microdroplets, where Marangoni and buoyant forces are negligible. 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