Investigation on heat transfer and pressure drop in shell and cone helically coiled tube heat exchanger using MWCNT water nanofluids

Abstract

A high performance heat transfer system assumes an extremely essential job in numerous mechanical applications. Among the passive transfer exchange upgrade methods, the cone helically coiled tube has been demonstrated to be extremely powerful as it gives a helical way to the stream and creates an optional stream. The customary heat transfer liquids have just constrained thermal conductivity that very confines the proficiency of the heat exchangers. A few inquires about have been completed for recent decades to investigate the imaginative strategies for improving the heat productivity of conventional heat transfer liquids. One among the techniques is that mixing high thermally conductive particulate solids, for example, metals or metal oxide into the base liquid. The scattering of 1-100nm estimated strong nanoparticles in the customary heat transfer liquids is regularly named as nanofluids, which displays significantly higher convective heat transfer when contrasted with the conventional heat transfer liquids. In this present examination, analysis of the heat exhibition of Shell and cone helically coiled tube exchanger by utilizing Multi Walled Carbon Nanotube (MWCNT) water/nanofluids has been performed. MWCNT water/nanofluids are taken as cone helically coiled tube side liquid with high temperature water taken as shell side liquid to explore the heat transfer. The MWCNT water/nanofluids at 0.1%, 0.3% and 0.5% volume concentration were combined in two stage technique utilizing surfactant. The dry MWCNT nanoparticles is scattered in refined water and Sodium Dodecyl Benzene Solfonates (SDBS) is added as surfactant to enhance the steadiness of nanofluids. The MWCNT and MWCNT/water nanofluids were portrayed by utilizing X-Ray Diffraction (XRD) and Transmission Electron Microscope (TEM). It is discovered that the normal molecule size is in the scope of 50-80nm and the particles are persistently suspended in the base liquids newline