Experimental investigation of Convective Heat Transfer of Carbon Nanotubes / Water Flow in a helical Triple tube Heat Exchanger

Document Type : Research Paper


1 Correspondig Author, Assistant Professor, Reactor and Nuclear Safety Research School, Nuclear Science and Technology Research Institute (NSTRI), Iran

2 M.Sc. of Mechanical Engineering, Islamic Azad University, Iran


In this work, the thermal performance of CNT/water nanofluid for the heat
exchanger with helical triple tubes is investigated experimentally. The
geometry of the tube, the volume percentage of nanoparticles,
and Reynolds number are three key characteristics investigated. Two
cases with different curvature ratios of 0.010 and 0.0167 are constructed
and compared to investigate the impact of the curvature ratio on
convection heat transfer. The results show that the Nusselt number of
nanofluids is larger than the base fluid. In addition, maximum and
minimum values of Nusselt number are found for Reynolds numbers of
1000 and 5000 correspondingly. The results show a slight reduction in
pressure drop for pure water as the Dean number increased. Moreover,
while the volume fraction of nanoparticles less than 0.1%, the Nusselt
number increased with a shallow slope.


Main Subjects

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