Abstract
This research present steady state heat transfer and fluid flow characteristics in concentric pipe with coiled tube insert for turbulent flow regime with metal oxide nanofluid using ANSYS-FLUENT 18.0 where the governing equations of mass, momentum and heat transfer were solved simultaneously, using the k-e two equations turbulence model. Copper was chosen as the as metal for the construction of pipe and the helical tube insert. Coiled tube with curvature to pitch ratio as 1 and 2.5 mm in diameter with 1% volume fractions of TiO2 and CuO Nanofluid with Reynolds number ranged from 4000-16000 were considered in this research. The heat generated from constant water temperature (80 °C) with constant flow rates in helical coil (Re=4000). The Result shows that the heat and friction coefficients conducted by vortex generator raised with Reynolds number and accretion of nanoparticle presence. Furthermore, the maximum rate of heat transfer with significant intension in friction coefficient has been produced TiO2 nanofluid by as compared with CuO and water.
Highlights
Many published articles related to experimental and numerical investigation on convective heat transfer using helical coil and water as test fluid have been reported in the literature [3,4,5,6,7,8,9,10,11,12,13]
Small amount of nanoparticles was dispersed into base fluid to improve its thermal conductivity
The results demonstrate around 10% augmentation in heat characteristics for CuO nanofluid with a significant increase in friction characteristics compared to TiO2 nanofluid and water
Summary
Heat transfer enhancement technique plays substantial role for laminar flow regime, due to the deficiency of heat transfer coefficient in plain tubes. Passive techniques require fluid additives, surface modifications, or swirl/vortex flow devices to enhance heat transfer. Different types of metal and metal oxides nanoparticles were utilized for nanofluid preparation; gold (Au), copper (Cu), and silver (Ag) and TiO2, Fe3O4, Al2O3, and CuO [15,16,17,18,19,20,21]. In the present work a numerical investigation on heat transfer enhancement in concentric pipe with coiled tube insert as vortex generator with 1% v/v of CuO and TiO2 and nanofluids is simulated using Computational Fluid Dynamic (CFD). Physical model Geometry and Grid of 1000 mm of copper concentric pipe fitted with coiled tube insert with curvature to pitch ratio as 1 and 2.5 mm in diameter was created using ANSYS-FLUENT 18.0 as shown in Figuers 1, 2.Water, TiO2 and CuO Nanofluid are selected as working fluids
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