Experimental thermal performance investigation of double pipe heat exchanger using MWCNT/water nanofluid

Energy, Environment and Storage Journal, cilt.3, sa.3, ss.96-104, 2023 (Hakemli Dergi)

ABSTRACT. This paper presents an experimental study investigating the thermal performance of multiwall carbon

nanotubes in a twin pipe heat exchanger using a water-based fluid. The research followed a two-step method, where a

concentration of 0.01 weight percent of SDS surfactant was utilized to prepare the carbon nanotubes. The heat transfer

coefficient, friction coefficient, and overall heat transfer coefficient of the nanofluid were compared to those of the base fluid.

The results revealed that the addition of a small amount of multiwall carbon nanotubes significantly enhanced the thermal

conductivity and heat transfer coefficient of the water-based fluid. Moreover, the heat transfer coefficient exhibited an

increase with higher Reynolds numbers. When the nanofluid flowed counter currently and was in the outer tube, the highest

values for the overall heat transfer coefficient and the heat transfer coefficient were determined as 2864 and 7655.7 W/m2K,

respectively. The findings indicate notable improvements in the thermophysical and thermal characteristics of the nanofluid.