IMPROVING THE THERMAL PERFORMANCE OF CONCENTRIC-TUBE HEAT EXCHANGERS USING MAGNETIC NANOFLUIDS

İngilizce (OpenAlex)

This study demonstrated experimentally the thermal enactment of Parallel and Counter-Flow Concentric Tube Heat Exchanger, by utilizing two varieties of magnetic nanofluids that corresponded to distilled water. Iron (II, III) oxide (Fe3O4)/water, Iron (III) oxide (Fe2O3)/water were the magnetic nanofluids that used in this investigation. Direct Synthesis Method was employed to create MNFs with concentration reached to 0.3 wt%. Triton X-100 at a concentration of 0.2 wt% was added to the solution to preserve the composed nanofluid stability and evade agglomeration. The experimental results indicate that distilled water demonstrated appreciable lower thermal performance compared to nanofluids. The improving of the heat transfer coefficient in the system reached about 48.13% and 28.91% for the Parallel and Counter-Flow Concentric Tube Heat Exchanger respectively using Fe3O4/water as a working fluid under specific conditions such as Re Numbers were equal to 33707 and 43338 respectively as well as volume flow rates were 7 lpm and 9 lpm. While, under the same previous conditions, the enhancement values were 44.98 % and 21.65% respectively as Fe2O3/water the working fluid.