Waqar Ahmed

Title : Experimental study on heat transfer improvement in a circular passage using Metal Oxide and Ethylene Glycol based well stable Nanofluids

Abstract:

Zinc Oxide @ Glycol based nanofluids was prepared using the ultra-sonochemical technique and 2 step methods. The heat convection characteristics of as prepared nanofluids were observed for a closed single conduit in turbulent flow regimes. The prepared nanofluids were characterized for UV-vis, FTIR, XRD, FESEM, and TEM analysis to confirm the accurate synthesis of ZnO nanoparticles. Analytical data related to heat transfer properties of the synthesized nanofluids for the heat exchanger, incorporated with the conduit test section were collected. The addition of ZnO solid nanoparticles in the Ethylene Glycol enhanced the value of thermal conductivity and other thermo physical characteristics of the nanofluids. Supreme thermal conductivity was recorded at 45 C for using 0.1 wt.% of Zinc Oxide @ Glycol based nanofluids. Adding more wt.% of the ZnO solid nanoparticles in the Ethylene Glycol increased the thermal conductivity subsequently with variations in temperature from 20 to 45ºC. Furthermore, Nusselt numbers of Zinc Oxide @ Glycol based nanofluids were calculated at different wt.% of ZnO present in Ethylene Glycol base fluid. The occurrence of ZnO nanoparticles into the Ethylene Glycol base fluid intensify the Nusselt (Nu) number by 51.5%, 43.79%, 38%and 24.06% for 0.1 wt.%, 0.075 wt.%, 0.05 wt.% and 0.025wt.% concentrations, respectively. Varying wt.% of ZnO (0.1 wt.%, 0.075 wt.%, 0.05wt.%). The absolute average heat transfer of Zinc Oxide @ Glycol based nanofluids using at the highest concentration of 0.1 wt.% was enhanced compared to the Ethylene Glycol base fluid. The magnitude of absolute average heat transfer was increased from 600 W/m²k for the EG@DW mixture to 1292 W/m²k for Zinc Oxide @ Glycol based nanofluids. Correspondingly, the heat transfer development at the other three (0.075 wt.%, 0.05 wt.%, and 0.025 wt.%) was observed as 600–1167, 600–1010 and 600–970 W/m²k, respectively, which is superior to pure Ethylene Glycol base fluid.

Biography:

Waqar Ahmed had done his Ph.D. degree in Materials Physics (Distinction + GOT Excellence award with 10 ISI papers + 1 Patent) from the University of Malaya world QS ranking 65 in 2021. As a Ph.D. researcher at the Institute for advanced studies at the University of Malaya, he have led his research activities to synthesize the metal oxides, graphene, carbon nanotubes, and their binary and ternary composite for energy-related varying applications like (Energy storage, sensors, energy transportation, Heat, and Mass Transfer, Heating and cooling of Electrical and electronic systems, which helps in solidified my interest in the area of materials and nanofluids.