Heat transfer enhancement in a helically coiled convergent and divergent tube heat exchanger with alumina oxide nanofluid

In this investigation, the analysis of heat transfer coefficient a shell, helically coiled convergent-divergent tube exchanger has been carried out by utilizing Al2O3/water nanofluid. The nanofluid was prepared using two-stage technique with proportions 0.1vol%, 0.3vol%, and 0.5vol%. inner coefficient, overall Nusselt number were analyzed it found that is increased, increase dean particle volume concentration. experimental tests in range 1100<De<4200. When compared to base fluid, improved 27%, 55%, 78% at 0.1%, 0.3% 0.5% Nanofluid respectively. fluid fixed number, viewed as 51%, 72% 0.3%, nanofluid, investigations enhancement increased due thermal conductivity while increasing %vol concentration Brownian movement nanoparticles. viscosity which pressure drop. It concluded exchangers along able enhance considerable There no adverse effect on development optional streams or blending liquids.