banner.jpg 313 Interrupted Jet Impingement of Nanofluids on Heated Surfaces Shreyak Yadava, Sushant Kumarb and Shibu Clementc Department of Mechanical Engineering, Birla Institute of Technology and Science Pilani - Goa Campus, NH -17B, Zuarinagar, Goa, India. ashreyakyadav@gmail.com bsushant08kr@gmail.com cshibu@goa.bits-pilani.ac.in ABSTRACT

In this paper, heat transfer in a confined pulsating turbulent slot impinging jet, with water based nanofluids, has been investigated numerically. The effect of various parameters like pulsating frequency (f), Reynolds Number (Re) and the nanoparticle volume fraction (φ) on heat transfer characteristics has been studied. By varying the jet velocity in an intermittent (on-off) fashion, square wave pulsations in the jet velocity has been obtained. The governing equations have been solved using a commercial software, FLUENT®. Study is conducted for three different flow frequencies of 1 Hz, 5 Hz and 10 Hz where the nanoparticles concentration varies from 0% to 6% for different Re (5000 and 7000). Time averaged Nusselt Number, Nu, was analyzed which supported the fact that heat transfer improves with increase in concentration of nanofluids for an interrupted jet impingement.

Keywords: Nanofluids, Interrupted jet impingement, Convective heat transfer, Time averaged Nusselt Number.

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