Molecular dynamics studies on heat transfer control between water and silica using nanoscale surface patterns
tarafından
 
Özen, Celal Can, author.

Başlık
Molecular dynamics studies on heat transfer control between water and silica using nanoscale surface patterns

Yazar
Özen, Celal Can, author.

Yazar Ek Girişi
Özen, Celal Can, author.

Fiziksel Tanımlama
ix, 73 leaves: charts;+ 1 computer laser optical disc.

Özet
Due to recent advances in manufacturing, component sizes have tremendously decreased in computer electronics and communication devices. Miniaturization has led to a substantial increase in memory and computational power but also created heat dissipation problems. Understanding heat transfer and temperature distribution in these devices became crucial for thermal management. At nanoscale, heat transfer through dielectric materials is mostly determined by phonon transport. The phonon passage is interrupted through the interfaces which creates temperature jumps and dominates the heat transfer rates at nanoscale. Kapitza length characterizes the interfacial thermal resistance as a function of temperature jump at the solid-liquid interface. In this study, heat transfer from different nanoscale surface structures were investigated using Molecular Dynamics simulations. The systems were created by two parallel silica walls and water between them. Kapitza length values were calculated for seven different surface conditions for two different molecular surface interaction strength parameters yielding high and low wetting conditions. Measured Kapitza length values were characterized based on cavity width (w), cavity height (h), and unit crystal cavity volume (Vc). While the increase in pattern cavity width increased Kapitza length, increasing pattern cavity height decreased Kapitza value. However, a general characterization based on cavity volume could not be obtained. Instead, almost a uniform behavior was observed through the variation of Kapitza length of different size patterns as a function of Ac=Vch/w^2. Kapitza length decreased by approximately 19% and 29% for high and low wetting conditions, respectively, when Ac increased. Then, similar characterizations were done for variation of heat flux. Overall, heat flux increased by approximately 20% and 30% for high and low wetting conditions, respectively, when Ac increased. Results are important to better understand and control heat transfer between water and silica using nanoscale surface patterns.

Konu Başlığı
Nanotechnology.
 
Heat -- Transmission.
 
Molecular dynamics.
 
Heat flux.

Yazar Ek Girişi
Barışık, Murat,

Tüzel Kişi Ek Girişi
İzmir Institute of Technology. Mechanical Engineering.

Tek Biçim Eser Adı
Thesis (Master)--İzmir Institute of Technology:Mechanical Engineering.
 
İzmir Institute of Technology: Mechanical Engineering --Thesis (Master).

Elektronik Erişim
Access to Electronic Versiyon.


LibraryMateryal TürüDemirbaş NumarasıYer Numarası
IYTE LibraryTezT002273TJ260 .O99 2020