The improvement of nanofluid stability on double pipe heat exchanger using thermoacoustic methods

A double pipe heat exchanger is a functioned device to transfer heat between two fluids while preventing mixing. While the fluid is a vital heat transfer medium in double pipe heat exchangers, typical fluids have limits due to their low thermal conductivity. Previous researchers have examined suspensions of solid particles with nanometers (10−9 m) in a base fluid to enhance the thermal conductivity. This work aimed to investigate the stabilising influence of Brownian motion on the convection coefficient by employing the thermoacoustic approach and sonification of acoustic waves to nanofluids. Sonification was carried out in this study at 200 Hz, 400 Hz, and 600 Hz using Al2O3 nanoparticles at a concentration of 0.2%. The results demonstrated that by combining the thermoacoustic approach with the sonification of acoustic waves, the effect of Brownian motion in a nanofluid flow might be stabilised. The best results are attained at the most significant frequency of 600 Hz. The stabilisation of the brown motion effect caused by sonification will slow the accumulation of the nanofluids and result in their stability. Thus, it is reasonable to predict that the process of heat absorption by nanofluids will be superior to that without sonification.