Research Information System
Thesis Type: Postgraduate
Institution Of The Thesis: Gazi Üniversitesi, Fen Bilimleri Enstitüsü, Turkey
Approval Date: 2018
Student: EMRE EROL
Supervisor: TAYFUN MENLİK
Open Archive Collection: AVESIS Open Access Collection
Abstract:Nowadays, using energy sources efficiently become more important topic. In this study, main topic is improving heat exchangers efficiency by using nanofluids. Tecnological developments enable us to manufacture nano-size metalic particules which have high heat transfer performance. In this study, main idea is researching effect of thermal conductivity of Titanium dioxide-water nanofluids (as a hot fluid) compared to water experimentally. Concentric, nested tubular type heat exchanger is used at experimental setup. System runs at parallel flow and counter-current flow. At the experimental setup 44 nm size and 97% purity TiO2 nanofluids were used which are suspended at 2%(mass/mass) concentration. Total heat transfer coefficient of system increased by 17% with using nanofluids at parallel flow condition compared to water. Also, hot fluid heat transfer coefficient and cold fluid coefficent improved by 38% and 3% respectively. Percentage of heat transfer enhancements at counter-current flow was calculated as 12%, 26% and 1% respectively.