Phase change heat transfer on micro/nano structured enhanced surfaces

Official URL: http://risc01.sabanciuniv.edu/record=b1817045 (Table of Contents)

Due to the recent trend of miniaturization of electronic devices, thermal management has become obligatory and yet challenging. There are many cooling methods such as spray cooling and passive cooling techniques involving phase change phenomena. Among phase change (liquid-vapor) phenomena, boiling is a widely used phenomenon in the industry. Owing to a large amount of heat dissipation and achievable high heat transfer coefficients, it is one of the most effective heat transfer mechanisms for cooling high power microelectronic devices. With the help of material science and nanotechnology, various types of nanostructures on surfaces are now available. Different types of enhanced surfaces (e.g. micro/nano structured surfaces) have been used by many investigators to enhance heat transfer coefficient and also reduce wall superheat. In this thesis, two different futuristic types of enhanced surfaces have been designed, fabricated and implemented. First, an effective and facile method for surface enhancement via crenarchaeon Sulfolobus Solfataricus P2 bio-coatings is presented and tested under boiling condition. Additionally, enhanced surfaces with mixed wettability (Biphilic surfaces) have been designed and fabricated to assess the effect of heterogeneous wettability on boiling heat transfer and cooling performance. In both cases, high heat removal performance has been achieved. Promising results for both ii types of coatings suggest such coatings as a novel solution for high efficiency and enhanced cooling applications