Khalili Sadaghiani, Abdolali and Saadi, Nazwat S. and Semsari Parapari, Sorour and Karabacak, Tansel and Keskinöz, Mehmet and Koşar, Ali (2017) Boiling heat transfer performance enhancement using micro and nano structured surfaces for high heat flux electronics cooling systems. Applied Thermal Engineering . ISSN 1359-4311 (Print) 1873-5606 (Online) Published Online First http://dx.doi.org/10.1016/j.applthermaleng.2017.08.018
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Official URL: http://dx.doi.org/10.1016/j.applthermaleng.2017.08.018
Abstract
Flow boiling enhancement using structured surfaces in microchannels is a promising method to achieve high heat removal rates. In this study, it is aimed to study the effect of surface structure size (size scale i.e. micro and nano size) on boiling heat transfer characteristics of samples with different surface morphology. High speed and thermal cameras were employed for analyzing the obtained results. A channel with dimensions of 14×15×0.5 mm3 was utilized in the experiments. Distilled water was used as the working fluid, and the experiments were conducted at mass fluxes of 50, 75, 100 and 125 kg/m2.s. Heat transfer coefficients were obtained along with associated boiling images. Based on the visualization study results, two flow maps were constructed for a rectangular microchannel with micro and nano scale structures on copper surfaces. It was observed that the surface morphology remarkably changed boiling heat transfer mechanisms. According to the obtained thermal images, bubble departure frequency increased with surface structures, and the surface temperature distribution was more uniform for surfaces with nano scale structures (nano-structured and micro-nano-structured) compared to other surfaces (untreated, micro-structured). The promising results reveal the potential of micro and nano scale structured surfaces for achieving improved energy efficiency for electronics cooling systems.
Item Type: | Article |
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Uncontrolled Keywords: | Flow boiling; micro and nano structured surfaces; flow patterns; heat transfer enhancement |
Subjects: | T Technology > T Technology (General) T Technology > TJ Mechanical engineering and machinery Q Science > QC Physics |
Divisions: | Faculty of Engineering and Natural Sciences > Academic programs > Mechatronics Faculty of Engineering and Natural Sciences > Basic Sciences > Physics Faculty of Engineering and Natural Sciences |
Depositing User: | Ali Koşar |
Date Deposited: | 18 Aug 2017 12:28 |
Last Modified: | 22 May 2019 13:54 |
URI: | https://research.sabanciuniv.edu/id/eprint/33026 |
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- Boiling heat transfer performance enhancement using micro and nano structured surfaces for high heat flux electronics cooling systems. (deposited 18 Aug 2017 12:28) [Currently Displayed]