Interplay of transport mechanisms during the evaporation of a pinned sessile water droplet

2021-07-01
Akdag, Osman
Akkuş, Yigit
Çetin, Barbaros
Dursunkaya, Zafer
Show full item record
Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
119
views
23
downloads
Droplet evaporation has been intensively investigated in past decades owing to its emerging applications in diverse fields of science and technology. Yet the role of transport mechanisms has been the subject of a heated debate, especially the presence of Marangoni flow in water droplets. This work aims to draw a clear picture of the switching transport mechanisms inside a drying pinned sessile water droplet in both the presence and absence of thermocapillarity by developing a comprehensive model that accounts for all pertinent physics in both phases as well as interfacial phenomena at the interface. The model reveals a hitherto unexplored mixed radial and buoyant flow by shedding light on the transition from buoyancy induced Rayleigh flow to the radial flow causing the coffee ring effect. Predictions of the model excellently match previous experimental results across varying substrate temperatures only in the absence of Marangoni flow. When thermocapillarity is accounted for, strong surface flows shape the liquid velocity field during most of the droplet lifetime and the model starts to overestimate evaporation rates with increasing substrate temperature.
https://hdl.handle.net/11511/91617
PHYSICAL REVIEW FLUIDS
Department of Mechanical Engineering, Article

Suggestions

Encapsulated green magnetic nanoparticles for the removal of toxic Pb2+ and Cd2+ from water: Development, characterization and application
Ali, Imran; Peng, Changsheng; Lin, Dichu; Saroj, Devendra P.; Naz, Iffat; Khan, Zahid M.; Sultan, Muhammad; Ali, Mohsin (Elsevier BV, 2019-03-15)
Current research is based on an innovative approach of the fabrication of encapsulated sustainable, green, phytogenic magnetic nanoparticles (PMNPs), to inhibit the generation of secondary pollutants (Iron/Fe degrees) during water treatment applications. These novel bio-magnetic membrane capsules (BMMCs) were prepared using twostep titration gel crosslink method, with polyvinyl alcohol and sodium alginate matrix as the model encapsulating materials to eliminate potentially toxic metals (Pb2+ and Cd2+) from ...
The effect of reed beds on wave attenuation and suspended sediment concentration
Oğuz, Elif; Koroglu, Aysun; Kabdaşlı, Mehmet Sedat (Coastal Education and Research Foundation, 2013-01-01)
The effect of emergent and submerged vegetation on uniform and oscillatory flow conditions has been intensively studied by researchers in the last two decades. It has been determined that vegetation affects wave characteristics and cause wave attenuation especially in shallow waters where wave orbitals are in interaction with vegetation. Consequently they affect sediment deposition and resuspension acting as a sink. The aim of this study is to determine wave attenuation due to vegetation, and to identify th...
Integration of graphene with GZO as TCO layer and its impact on solar cell performance
Zan, Recep; Olgar, Mehmet Ali; Altuntepe, Ali; Seyhan, Ayse; Turan, Raşit (2022-01-01)
In this study, we investigated the impact of incorporating graphene with Ga-doped ZnO (GZO) when employing them as a TCO layer on Si-based solar cell. GZO thin films with various thicknesses (50-450 nm) were fabricated by the sputtering method using a single target. The aim here was to determine the GZO film with the optimum thickness to incorporate it with single layer graphene as TCO. This thickness was found to be 350 nm as that was the best crystalline quality found in the Opattern. Further, this sample...
Integration of solar energy and industrial waste heat into an industrial zone with heat distribution networkand optimization of energy sources for units
Karımı, Sasan; Güvenç Yazıcıoğlu, Almıla; Department of Mechanical Engineering (2019)
In the context of European Union INSHIP (Integrating National Research Agendas on Solar Heat for Industrial Process) project, solar energy and industrial waste heat integration into two food industry Units are simulated and optimized in Izmir, Turkey. Two Units could be connected by a Heat Distribution Network (HDN) to share energy between them. Unit’s thermal systems simulation and energy sources optimization is done by TRNSYS and MATLAB respectively, to use both software capabilities. In each time interva...
Identifying impacts of climate change on water resources using CMIP6 simulations: Havran basin case
Çaktu, Yasemin; Yücel, İsmail; Fıstıkoğlu, Okan; Department of Earth System Science (2022-9-2)
This study aims to investigate climate change effect on precipitation, temperature and discharge in Havran basin which has thousands of decares of agricultural lands. Changes in precipitation and temperature were determined using 10 global climate models (GCMs) for total precipitation and 13 GCMs for average temperature from Coupled Model Intercomparison Project Phase 6 (CMIP6) for the historical period, SSP2-4.5 (moderate-case) and SSP5-8.5 (worst-case) scenarios. Both station observations and ERA5-Land re...
Citation Formats
O. Akdag, Y. Akkuş, B. Çetin, and Z. Dursunkaya, “Interplay of transport mechanisms during the evaporation of a pinned sessile water droplet,” PHYSICAL REVIEW FLUIDS, pp. 0–0, 2021, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/91617.
METU IIS - Integrated Information Service open@metu.edu.tr