TY - JOUR ID - 248921 TI - Experimental investigation of Convective Heat Transfer of Carbon Nanotubes / Water Flow in a helical Triple tube Heat Exchanger JO - Iranian Journal of Mechanical Engineering Transactions of the ISME JA - JMEE LA - en SN - 1605-9727 AU - Talebi, M. AU - Ghafori, H. AD - Correspondig Author, Assistant Professor, Reactor and Nuclear Safety Research School, Nuclear Science and Technology Research Institute (NSTRI), Iran AD - M.Sc. of Mechanical Engineering, Islamic Azad University, Iran Y1 - 2021 PY - 2021 VL - 22 IS - 2 SP - 106 EP - 115 KW - helical triple tube KW - Heat Transfer KW - nanofluid KW - Carbon Nanotube DO - 10.30506/jmee.2022.538202.1272 N2 - In this work, the thermal performance of CNT/water nanofluid for the heatexchanger with helical triple tubes is investigated experimentally. Thegeometry of the tube, the volume percentage of nanoparticles,and Reynolds number are three key characteristics investigated. Twocases with different curvature ratios of 0.010 and 0.0167 are constructedand compared to investigate the impact of the curvature ratio onconvection heat transfer. The results show that the Nusselt number ofnanofluids is larger than the base fluid. In addition, maximum andminimum values of Nusselt number are found for Reynolds numbers of1000 and 5000 correspondingly. The results show a slight reduction inpressure drop for pure water as the Dean number increased. Moreover,while the volume fraction of nanoparticles less than 0.1%, the Nusseltnumber increased with a shallow slope. UR - https://jmee.isme.ir/article_248921.html L1 - https://jmee.isme.ir/article_248921_8a7ec089d3369b548839d21b00ae2bc6.pdf ER -