Abstract
A numerical analysis has been performed on a parallel flow shell and tube heat exchanger with different hybrid nanofluids in the present study. The heat exchanger consists of baffles which may increase the heat transfer characteristics. Hybrid nanofluids are used as a cooling medium. The author studied the effect of dissolved nanoparticles on Prandtl number and thermal transfer characteristics. The results show a convincing enhancement in the heat transfer characteristics by introducing hybrid nanoparticles into the primary fluid (water). The total concentration of nanoparticles was 2 vol%. Different combinations of nanoparticles as a coolant studied were Al₂O₃+MWCNT, Al₂O₃+Beo, Al₂O₃+AlN, and Al₂O₃+TiO₂ (in equal volume ratios). The heat transfer rate was enhanced maximum by 16.5 % for Al₂O₃+MWCNT/ water hybrid nanofluid. Moreover, Prandtl number was observed reduced using nanoparticles with a maximum reduction of 10.5 % for Al₂O₃+TiO₂/ water hybrid nanofluid.
 HIGHLIGHTS
 
 A numerical analysis was performed in a parallel flow shell and tube heat exchanger
 Nanofluids such as Al₂O₃+MWCNT, Al₂O₃+Beo, Al₂O₃+AlN, and Al₂O₃+TiO₂ (in equal volume ratios) was used as a coolant
 The effect of dissolved nanoparticles on Prandtl number and thermal transfer characteristics were studied
 The heat transfer rate was enhanced maximum by 16.5 % for Al₂O₃+MWCNT/ water hybrid nanofluid
 Prandtl number was observed reduced using nanoparticles with a maximum reduction of 10.5 % for Al₂O₃+TiO₂/ water hybrid nanofluid
 
 GRAPHICAL ABSTRACT
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