Modeling the Evaporation of Drying Sessile Droplets with Buoyancy Driven Internal Convection

Download

e3sconf_icchmt2021_04013.pdf

Date

2021-05-18

Author

Akdağ, Osman
Akkuş, Yigit
Çetin, Barbaros
Dursunkaya, Zafer

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

135
views

40
downloads

Droplet evaporation is a fundamental phenomenon encountered in diverse applications such as inkjet printing, DNA mapping, film coating, and electronics cooling. Modeling the evaporation process of a sessile droplet is complicated because of the coupling of several physical phenomena occurring in different phases and various magnitudes such as the buoyant convection of the liquid in millimeter size droplets and that of the surrounding air/water vapor mixture, in the order of meters. In this study, the theoretical framework presented previously for the steadily fed droplets [Int J Therm Sci, 158 (2020) 106529] is extended to resolve the evaporation of drying droplets with a pinned contact line. Based on the quasi-steady-state assumption, buoyant convection inside the droplet and diffusive-convective transport of vapor in the gas domain are modeled. As a test case, drying process of a water droplet with a 68° initial contact angle on a heated substrate is simulated and the predictions of the model are interpreted.

Subject Keywords

Droplet evaporation, Evaporation modeling, Computational fluid dynamics

URI

https://hdl.handle.net/11511/91583

DOI

https://doi.org/10.1051/e3sconf/202132104013

Conference Name

13th ICCHMT 2021

Collections

Department of Mechanical Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

A theoretical framework for comprehensive modeling of steadily fed evaporating droplets and the validity of common assumptions Akkus, Yigit; ÇETİN, BARBAROS; Dursunkaya, Zafer (Elsevier BV, 2020-12-01) A theoretical framework is established to model the evaporation from continuously fed droplets, promising tools in the thermal management of high heat flux electronics. Using the framework, a comprehensive model is developed for a hemispherical water droplet resting on a heated flat substrate incorporating all of the relevant transport mechanisms: buoyant and thermocapillary convection inside the droplet and diffusive and convective transport of vapor in the gas domain. At the interface, mass, momentum, and...
Comprehensive modeling of heat and mass transport in a micropillar evaporator Yuncu, Göksel; Dursunkaya, Zafer; Akkuş, Yiğit; Department of Mechanical Engineering (2022-4-05) Thin-film evaporation and the replenishing capillary liquid flow have paramount importance for various technological applications spanning from desalination to electronics cooling. With the developments enabling faster and cheaper yet more precise fabrication, evaporators with micropillar arrays have attracted substantial attention to sustain efficient evaporation fed by passive liquid transport. Although considerable effort has been devoted to designing optimized wicks, the full picture is still blurry due...
Investigation of warpage behavior of single crystal silicon on a silicon Adhesive ceramic integrated structure at cryogenic temperatures Baloğlu, Can; Okutucu Özyurt, Hanife Tuba; Dursunkaya, Zafer (2016-03-17) Understanding thermal stress and warpage behavior of heterogeneous component assemblies is vital in infrared sensor applications of silicon semiconductor material. The silicon semiconductor warpage behavior of the integrated structure composed of silicon material itself, an adhesive layer and a ceramic layer is analyzed by both FEM and experimental studies. The studies are performed between room temperature and 80 K. Thickness of each layer has an effect on the warpage. The silicon warpage of the initial ba...
Effects of optical design modifications on thermal performance of a highly reflective HfO2/SiO2/TiO2 three material coating OCAK, M.; Sert, Cüneyt; Okutucu-Ozyurt, T. (Springer Science and Business Media LLC, 2018-02-01) Effects of layer thickness modifications on laser induced temperature distribution inside three material, highly reflective thin film coatings are studied with numerical simulations. As a base design, a 21 layer coating composed of HfO2, SiO2 and TiO2 layers of quarter wave thickness is considered. First, the laser induced temperature distribution in this base design is obtained. Then the layer thicknesses of the base design are modified and the corresponding temperature distributions in four alternative no...
Development of electrochemical etch-stop techniques for integrated MEMS sensors Yaşınok, Gözde Ceren; Akın, Tayfun; Department of Electrical and Electronics Engineering (2006) This thesis presents the development of electrochemical etch-stop techniques (ECES) to achieve high precision 3-dimensional integrated MEMS sensors with wet anisotropic etching by applying proper voltages to various regions in silicon. The anisotropic etchant is selected as tetra methyl ammonium hydroxide, TMAH, considering its high silicon etch rate, selectivity towards SiO2, and CMOS compatibility, especially during front-side etching of the chip/wafer. A number of parameters affecting the etching are inv...

Citation Formats

O. Akdağ, Y. Akkuş, B. Çetin, and Z. Dursunkaya, “Modeling the Evaporation of Drying Sessile Droplets with Buoyancy Driven Internal Convection,” presented at the 13th ICCHMT 2021, Paris, Fransa, 2021, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/91583.