UDC 536.25

Paisarn Naphon and Lursukd Nakharintr

NANOFLUID JET IMPINGEMENT HEAT TRANSFER CHARACTERISTICS 

IN THE RECTANGULAR MINI-FIN HEAT SINK

The nanofluid jet impingement heat transfer characteristics in rectangular 
mini-fin heat sink are studied. The heat sink is fabricated from aluminum 
by a wire electrical discharge machine. The nanofluid is the mixture of 
deionized water and nanoscale TiO2 particles with a volume nanoparticle 
concentration of 0.2%. The results obtained for the nanofluid jet 
impingement cooling in the rectangular mini-fin heat sink are compared with 
those found in the water jet impingement cooling. The effects of the inlet 
temperature of the nanofluid, its Reynolds number, and the heat flux on 
the heat transfer characteristics of the rectangular mini-fin heat sink are 
considered. It is found that the average heat transfer rates for the nanofluid 
as coolant are higher than those for deionized water.

Keywords: jet impingement, nanofluids, rectangular mini-fin heat sink.

Thermo-Fluid and Heat Transfer Enhancement Laboratory, Department of Mechanical Engineering, Faculty of Engineering, Srinakharinwirot University, 63 Rangsit-Nakhornnayok Rd., Ongkharak, Nakhorn-Nayok, 26120, Thailand; email: paisarnn@swu.ac.th. Original article submitted September 21, 2011.