The performance of a gasoline engine radiator nanofluids

The study of improving temperature transfer becomes more important in energy economy point of view, when temperature change in any field of an industry. The improvements of temperature transfers are categorized as "passive", "active", and "mixed". The passive methods are used when there is no need for an external force. Rotary fluid devices, rough surfaces, elements of improvements in pipes etc. are among the examples of passive methods. The active methods are used when there is a need for an external force and mechanic mixers, fluids vibration, surface vibration, electrostatic fields etc. are among the examples of active methods. For the mixed methods, two or more of active and passive methods are used together. Low performance of temperature transfer fluids like water, engine oil, and ethylene glycol are used for the conventional temperature changers. However, the ability of temperature transfer of these fluids is not at an optimal level as they are all in liquid phase. Therefore, in the recent years with the improvements in nano technology, nano fluids with the high performance temperature transfer are manufactured with the help of nano particles in micron dimensions. These nano fluids are used in many scientific studies and applications as coolant fluids, as a result, they have been proven to be effective in improving temperature transfer. In this thesis, nano fluids, derived from mixing water and nano compounds like Al2O3, Fe3O4, ZnO, ZrO2, SiO2, and TiO2 , are used as coolant fluid in four-stroke and four-cylinder internal combustion gasoline engine system. When radiator fan in engine coolant system is on, the contribution to temperature transfer has been measured for each and every nano fluid. In the light of the performed experiments, nano fluids that are experimented with are found to perform far better than antifreeze-water and water in temperature transfer. However, it has been observed that current nano fluids are non-soluble in water and they leave sediments in time, which is an important disadvantage of nano fluids. Key words: Gasoline engines, nono-fluids, engine coolant system, radiator.