A numerical investigation of the heat transfer characteristics of water-based mango bark nanofluid flowing in a double-pipe heat exchanger

Abstract

In 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 finite-volume 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.

Numerical Investigation of Heat Transfer and Pressure Drop Characteristics of Mango Bark-CO2 Nanofluid in inclined Gas Cooling Process

“…In an attempt to study bio-nanofluid characteristics, Onyiriuka et al [8] investigated the thermal characteristics of mango bark-water nanofluid in the horizontal in-tube heat exchanger. It was noted that there was an enhancement in the thermal performance of the nanofluid compared with water.…”

Computational investigation on heat transfer augmentation of a circular tube with novel hybrid ribs

“…Several enhancement methods are developed to increase the thermal and flow performance of heat exchangers. These modifications include swirl generators such as twisted tapes [9][10][11][12][13][14][15][16], artificial roughness in the form of corrugation [14] and ribs on the surface of duct [17], usage of fins and baffles [18], nanofluids [19][20][21], etc. Such modifications introduce the interference in the flow field which result in disturbed boundary layer, mixing of fluid elements as a result of which heat transfer is enhance.…”

Numerical study of the effects of geometric parameters and nanofluid properties on heat transfer and pressure drop in helical tubes

“…The nanoparticle diameter considered by 100 nm. Also, it was indicated that the average heat transfer coefficient trend with some specific amount Reynolds numbers [29]. Li et al [30] using a micro-channel heat sink to experimentally investigated the convective heat transfer of carbon-acetone nanofluid.…”

“…These studies have been mainly focused on modifying the flow structure by changing heat transfer area, raising heat transfer surfaces, generating turbulent mixing. They have even considered making thinner boundary layers and enhance the heat transfer efficiency of the working fluid (2021) 3:722 | https://doi.org/10.1007/s42452-021-04701-6 by modifying thermophysical properties, such as discovering better thermal conductivities [29][30][31].…”