Multi objective optimization of TiO2/water nanofluid flow within a heat exchanger enhanced with loose-fit delta-wing twisted tape inserts

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dc.contributor.authorThianpong, C.
dc.contributor.authorWongcharee, K.
dc.contributor.authorSafikhani, H.
dc.contributor.authorChokphoemphun, S.
dc.contributor.authorSaysroy, A.
dc.contributor.authorSkullong, S.
dc.contributor.authorEiamsa-ard, S.
dc.date.accessioned2026-08-06T10:36:22Z
dc.date.available2026-08-06T10:36:22Z
dc.date.issued2022-02-01
dc.description.abstractA hybrid technique by using TiO<inf>2</inf>/water nanofluid together with loose-fit delta-wing twisted tape (LTT-W) was employed for heat transfer enhancement. Experiments encompassed the TiO<inf>2</inf>-water nanofluids having concentration (φ) of 0.05%–0.15 vol% and the loose-fit delta-wing twisted tapes having two different wing arrangements (co- and counter arrangement) and three loose-fit ratios (c/D) of 0.0, 0.15, and 0.2. Experimental revealed that the system with combined enhancement technique gave considerably higher heat transfer than the one without enhancement technique. This can be attributed to the combined influences of swirling flow and higher thermal conductivity of the working fluid. Heat transfer rate and thermohydraulic performance rose with the decrease of loose-fit ratio and the rise of nanofluid concentration. The maximum thermohydraulic performance (TPF) of 1.36 was obtained at c/D = 0.0 and φ = 0.15%. The Multi-Objective Optimization (MOO) was also performed to study the optimal thermohydraulic performance by using GMDH models and NSGA II algorithms. The Pareto front, which contains very useful information, were extracted for both co and counter arrangements. The Pareto fronts have recognized very accurately, the best boundary of the experimental data with respect to the lowest friction factor and highest Nusselt number.
dc.identifier.citationInternational Journal of Thermal Sciences, 172, 2022
dc.identifier.doi10.1016/j.ijthermalsci.2021.107318
dc.identifier.issn12900729
dc.identifier.other2-s2.0-85119971704
dc.identifier.urihttps://dspace.kmitl.ac.th/handle/123456789/13054
dc.sourceInternational Journal of Thermal Sciences
dc.subjectHeat exchanger
dc.subjectHeat transfer
dc.subjectLoose-fit delta-wing twisted tape
dc.subjectLoose-fit twisted tape
dc.subjectMulti objective optimization
dc.subjectNSGA II
dc.subjectWing twisted tapes
dc.titleMulti objective optimization of TiO2/water nanofluid flow within a heat exchanger enhanced with loose-fit delta-wing twisted tape inserts
dc.typeArticle

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