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SHUICHI TORII,Yoshino Hajime 대한설비공학회 2015 International Journal Of Air-Conditioning and Refr Vol.23 No.1
Experimental study is performed on the turbulent heat transfer behavior of aqueous suspensionsof nanoparticles °owing through a horizontal circular pipe heated under constant heat °uxcondition. Consideration is given to the e®ects of nanoparticle concentration and Reynoldsnumber on heat transfer enhancement. It is found that (i) heat transfer enhancement is caused bysuspending nanoparticles, so that maximum value of the Nusselt number is over twice than that ofthe pure working °uid, (ii) graphene-oxide-nano°uid developed here is non-Newtonian °uid, and(iii) but the pressure drop for graphene-oxide-nano°uid is almost the same as that of the pureworking °uid, because volume fraction of particles is less than 1.0%.