Onyiriuka, E.J.Ewim, Daniel Raphael EjikeIghodaro, O.O.Adelaja, A.O.Ewim, D.R.E. (Daniel)Bhattacharyya, S.2020-02-042020-02-042019-09Onyiriuka, E.J., Ighodaro, O.O., Adelaja, A.O. et al. 2019, 'A numerical investigation of the heat transfer characteristics of water-based mango bark nanofluid flowing in a double-pipe heat exchanger', Heliyon, vol. 5, art. e02416, pp. 1-13.2405-8440 (online)10.1016/j.heliyon.2019.e02416http://hdl.handle.net/2263/73103In this study, the heat transfer characteristics of a new class of nanofluids made from mango bark was numerically simulated and studied during turbulent flow through a double pipe heat exchanger. A range of volume fractions was considered for a particle size of 100 nm. A two-phase flow was considered using the mixture model. The mixture model governing equations of continuity, momentum, energy and volume fraction were solved using the finitevolume method. The results showed an increase of the Nusselt number by 68% for a Reynolds number of 5,000 and 45% for a Reynolds number of 13 000, and the heat transfer coefficient of the nanofluid was about twice that of the base fluid. In addition, the Nusselt number decreased by an average value of 0.76 with an increase of volume fraction by 1%. It was also found that there was a range of Reynolds numbers in which the trend of the average heat transfer coefficient of the nanofluid was completely reversed, and several plots showing zones of higher heat transfer which if taken advantage of in design will lead to higher heat transfer while avoiding other zones that have low heat transfer. It is hoped that these results will influence the thermal design of new heat exchangers.en© 2019 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).Chemical engineeringEnergyMechanical engineeringNanotechnologyMixture modelBio-nanoparticleDouble-pipe heat exchangerHeat transferEngineering, built environment and information technology articles SDG-07SDG-07: Affordable and clean energyEngineering, built environment and information technology articles SDG-09SDG-09: Industry, innovation and infrastructureEngineering, built environment and information technology articles SDG-12SDG-12: Responsible consumption and productionArticle