Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Investigation of Marangoni-induced flows in vertical microchannels
Download
Investigation of Marangoni-induced flow in vertical microchannels (1.pdf
Date
2022-8-17
Author
Uğur, Ayşe
Metadata
Show full item record
This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
.
Item Usage Stats
149
views
266
downloads
Cite This
Marangoni convection is defined as the tendency of movement within a fluid from the regions of lower surface tension to those of higher locations. In literature, there are various studies related to Marangoni convection in horizontal microfluidic and microgravity systems. However, the researches about Marangoni convection in vertical flows for closed systems are relatively fewer in number. In this study, Marangoni effect due to temperature gradient is numerically investigated through a fluid-fluid interface in a vertical microchannel made of polydimethylsiloxane (PDMS). Marangoniinduced flow is created by forming an interface between air and water, due to Cassie- Baxter state observed in the hydrophobic surfaces. Firstly, a validation study is performed using experimental data in the literature for a horizontal setup. For various sizes of a vertical microchannel, Marangoni convection is numerically investigated to analyse flow characterization and its effect on temperature and velocity profiles.
Subject Keywords
Marangoni convection
,
Cassie-Baxter state
,
Microfluidics
URI
https://hdl.handle.net/11511/98774
Collections
Graduate School of Natural and Applied Sciences, Thesis
Suggestions
OpenMETU
Core
Analysis of Local Thermal Equilibrium Assumption in Transient Forced Convection in a Graphite Foam Channel
Gürüf, Gürşah; Solmaz, İsmail; Bayer, Özgür (2020-12-01)
In this study, the validity of Local Thermal Equilibrium (LTE) assumption in the transient forced convection of a rectangular channel filled with a block of graphite foam is examined numerically. The governing macroscopic energy conservation equations for solid and gas phases are derived by taking the average of the microscopic one over the averaging volume. Initially, LTE is in existence between the phases and then, the fluid temperature at the channel inlet is suddenly raised. Besides, an appropriate insu...
Investigation of Sea Surface Temperature (SST) Anomalies over Cyprus Area
Georgiou, Andreas; Akcit, Nuhcan (2016-04-08)
The temperature of the sea surface has been identified as an important parameter of the natural environment, governing processes that occur in the upper ocean. This paper focuses on the analysis of the Sea Surface Temperature (SST) anomalies at the greater area of Cyprus. For that, SST data derived from MODerate-resolution Imaging Spectroradiometer (MODIS) instrument on board both Aqua and Terra sun synchronous satellites were used. A four year period was chosen as a first approach to address and describe t...
Numerical investigation of natural convection from vertical plate finned heat sinks
Çakar, Kamil Mert; Albayrak, Kahraman; Department of Mechanical Engineering (2009)
The steady-state natural convection from vertically placed rectangular fins is investigated numerically by means of a commercial CFD program called ICEPAK. The effects of geometric parameters of fin arrays on the performance of heat dissipation from fin arrays are examined. In order to simulate the different fin configurations and compare the results with literature, two experimental studies from literature are selected. Optimum fin spacing for both studies are found numerically and compared with experiment...
FEM solution to natural convection flow of a micropolar nanofluid in the presence of a magnetic field
TÜRK, ÖNDER; Tezer, Münevver (2017-03-01)
The two-dimensional, laminar, unsteady natural convection flow in a square enclosure filled with aluminum oxide ()-water nanofluid under the influence of a magnetic field, is considered numerically. The nanofluid is considered as Newtonian and incompressible, the nanoparticles and water are assumed to be in thermal equilibrium. The mathematical modelling results in a coupled nonlinear system of partial differential equations. The equations are solved using finite element method (FEM) in space, whereas, the ...
Numerical study of Rayleigh Bènard thermal convection via solenoidal bases
Yıldırım, Cihan; Tarman, Işık Hakan; Department of Engineering Sciences (2011)
Numerical study of transition in the Rayleigh-B\'enard problem of thermal convection between rigid plates heated from below under the influence of gravity with and without rotation is presented. The first numerical approach uses spectral element method with Fourier expansion for horizontal extent and Legendre polynomal for vertical extent for the purpose of generating a database for the subsequent analysis by using Karhunen-Lo\'eve (KL) decomposition. KL decompositions is a statistical tool to decompose the...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
A. Uğur, “Investigation of Marangoni-induced flows in vertical microchannels,” M.S. - Master of Science, Middle East Technical University, 2022.
