Prof.Ali Koşar

Sabanci University Nanotechnology and Applications Center (SUNUM),  

Center of Excellence for Functional Surfaces and Interfaces for

Nanodiagnostics (EFSUN), Sabanci University, Istanbul, Turkey

Bio

Ali Koşar is a Distinguished Research Professor at Sabanci University.   He earned his master's and doctoral degrees in Mechanical Engineering from Rensselaer Polytechnic Institute.  He is focusing on the design and development of new generation micro heat sinks with functional surfaces and microfluidic devices including cavitation on chip devices. His research interests constitute a spectrum covering heat and fluid flow in micro/nano scale, condensation, boiling heat transfer, microfluidic systems, and cavitation. He co-authored over 180 research articles in top journals and 80 conference papers in prestigious international conferences. He has also a co-inventor on 10 granted patents and 10 pending patent applications. He received numerous national and international honors, including the µFIP Prominent Researcher Award" in the 2021 micro Flow and Interfacial Phenomena (µFIP) Conference, METU (Middle East Technical University) Prof. Mustafa N. Parlar Foundation Science Award (2021).  He is currently leading a large research group consisting of members from various disciplines, graduate students and engineers and to bridge different disciplines (Energy, Nanotechnology, Applied Physics, Bioengineering, Biochemistry, Mechanical Engineering). He also serves as a reviewer in many prestigious journals and is a Subject Editor in the Applied Thermal Engineering journal. He is the Co-director of Center of Excellence for Functional Surfaces and Interfaces for Nano diagnostics (EFSUN), a Distinguished Researcher of Sabanci University Nanotechnology and Application Center (SUNUM) and a Member of Turkish Academy of Sciences (TÜBA).

Title

Optimized mixed wettability surfaces for manipulation of phase change phenomena

Abstract

Boiling, droplet condensation, cavitation and freezing are major phase change phenomena.  Optimization for the nest performance can be achieved with surface modification involving mixed wettability surfaces.  One of the most promising approaches to have mixed wettability surfaces  include the preparation and use of biphilic surfaces (hydrophobic-hydrophilic, superhydrophobic-hydrophobic etc.) in thermal-fluid and energy systems.  In this regard, optimization efforts for various biphilic surfaces in pool boiling, flow boiling, dropwise condensation and freezing could be made to have the best performance and energy efficiency.  With the use of the optimum configurations depending on the application and phase change phenomenon, it will be possible to manipulate and achieve significant energy saving and efficiency in thermal-fluids and energy systems involving phase change.  In this talk, research efforts and outputs as well as recent developments and future research directions in this field will be discussed.