Journal Article

Thermohydraulic performance and field synergy analysis on streamlined conical annular fins with clove-functionalized GNP nanofluids

Tan, L.-L., Ho, M. L. G., Oon, C. S., Hung, Y. M.

2024

Overview

The current work involves optimization of the thermohydraulic performance and field synergy when employing various streamlined conical fins and clove-treated graphene nanoplatelets (CGNP) nanofluids. The results were compared with conventional fins and a smooth pipe, under identical working conditions. Findings revealed that all fin designs were capable of inducing recirculations comprised of secondary flows and vortices, that intensified fluid mixing and thinner thermal boundary layers, resulting in heat transfer enhancement. Utilizing the steep fin (SF), maximum heat transfer coefficient and Nusselt number were found to be enhanced up to 37.5%. In terms of hydraulic effects, the streamlined conical fins were capable of reducing frictional losses compared to the conventional fins, attributed to diminishing fluid stagnation and pressure drag. The results indicated that the addition of CGNP nanoparticles had enhanced heat transfer coefficient; however, it deteriorated Nusselt numbers, due to relatively greater enhancement in conductive heat transfer compared to the convective heat transfer in the thermal system. The combined efforts of the SF and the 0.1 mass% CGNP nanofluid achieved a maximum average heat transfer of 42.71% compared to distilled water within a smooth channel, under identical flowrates. Due to the low nanoparticle concentration employed, influence on the base fluid viscosity and wall shear stress was minimal, leading to negligible effects on the friction factors when employing the CGNP nanofluids. The study concluded that the utilization of the nanofluids and fins significantly improved field synergy numbers, implying enhanced synergy between the velocity and temperature fields, corresponding to optimal convective heat transfer.

• Publisher: Springer International Publishing,Springer,Springer Nature B.V
• Subject: Aerodynamics / Analytical Chemistry / Boundary layer / Chemistry / Chemistry and Materials Science / Comparative analysis / Conductive heat transfer / Convective heat transfer / Distilled water / Entropy / Fins / Fluid flow / Friction / Graphene / Heat conductivity / Heat transfer / Heat transfer coefficients / Inorganic Chemistry / Investigations / Measurement Science and Instrumentation / Nanofluids / Nanoparticles / Nusselt number / Optimization / Physical Chemistry / Polymer Sciences / Pressure drag / Reynolds number / Secondary flow / Thermal boundary layer / Vortices / Wall shear stresses