THERMAL AND HYDRODYNAMIC ANALYSIS OF NANOFLUIDS AT LOW CONCENTRATIONS IN A MICROCHANNEL HEAT SINK

Eyuphan Manay
Dept. of Mech. Eng, Faculty of Eng&Arc., Technical Univ. of Erzurum, Erzurum, Turkey

Bayram Sahin
Erzurum Technical University

Kadir Gelis
Dept. of Mach. and Metallic Tech., Voc. High Sch., Agri Ibrahim Cecen University, Agri, Turkey

Emre Mandev
Dept. of Mech. Eng, Faculty of Eng&Arc., Technical Univ. of Erzurum, Erzurum, Turkey

DOI: 10.1615/TFESC1.mnf.012866
pages 1617-1630

Ключевые слова: Heat transfer, pressure drop, TiO2-water nanofluid, microchannel.

Аннотация

In this study, heat transfer and pressure drop characteristics of water based nanofluids with low volumetrical concentrations (Ø=0.0025 and 0.005) in microchannel under constant heat flux boundary conditions have been investigated. Nanofluids will be prepared by the addition of TiO₂ nano sized particles into deionized water chosen as base fluid in two different volumetric ratios, and, the effects of parameters like flow velocity and particle volume fraction on heat transfer will be analyzed experimentally. The results have been presented with respect to convection heat transfer coefficient and pressure drop. It is concluded that nano sized TiO₂ particles in the base fluid have provided higher heat transfer and have not caused an excessive increase in pressure drop with respect to pure water. Convection heat transfer coefficient has also increased with an increase in the volume fraction.