Çoklu Mikrokanallarda Ferroakışkanların Isı Transferi ve Basınç Düşümü Karakteristiklerinin Deneysel İncelenmesi

Bu çalışmada su bazlı ferroakışkanların sabit ısı akısı sınır şartlarında dikdörtgen kesite sahip çoklu mikro

Anahtar Kelimeler:

Ferroakışkan, Fe2O3.NiO, mikrokanal, ısı transferi, nanoakışkan.

Experimental Investigation of Heat Transfer and Pressure Drop Characteristics of Ferrofluids in Multiple Microchannels

In this study, heat transfer and pressure drop characteristics of water based ferrofluids in multiplemicrochannels with rectangular cross section under constant heat flux boundary conditions were investigated.Ferrofluids were prepared by the addition of Fe2O3.NiO nano particles into pure water chosen as base fluid in twodifferent volumetric ratios (φ=0.0025 and 0.005), and the effects of parameters like Reynolds number, particlevolume fraction on heat transfer and pressure drop characteristics were analyzed experimentally. Under laminar flowand steady state conditions, heat transfer increased with increasing particle volumetric concentration. Minimum8.6% and maximum 31.6% enhancement in heat transfer was obtained according to pure water. Nano particlessuspended into the base liquid caused minimum 16.4 % and maximum 36.1% increase in friction factor accordingto pure water. Increasing particle volume concentration from 0.25% to 0.5% yielded 6.8% and 8.9% increase intotal heat transfer enhancement.

Keywords:

Ferrofluid, Fe2O3.NiO, heat transfer, microchannel, nanofluid,

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