Experimental study on Al2O3 /H2O nanofluid with conical sectional insert in concentric tube heat exchanger

A parallel flow heat exchanger containing conical sectional inserts with three different pitch ratio (i.e., 1, 2, and 3) in a different orientation to the flow direction of the working fluid had been fabricated. Al2O3 with different volume concentration, i.e., 0%, 2%, and 4% nanoparticles (90 nm size) were added to De-ionized water as the working fluid. The combined effect of the Nanofluid and the inserts in different orientations was studied. It was concluded that the insert, flow direction, and Nanofluid volume concentration provided most augmented heat transfer and enhanced the thermal properties.

Automated summary

A parallel flow heat exchanger was fabricated with conical sectional inserts of three different pitch ratios (1, 2, and 3) in orientations different from the working fluid flow direction. Al2O3 nanoparticles (90 nm size) with varying volume concentrations (0%, 2%, and 4%) were added to De-ionized water as the working fluid. The combined effect of the Nanofluid and the inserts in different orientations was studied, and it was concluded that the insert, flow direction, and Nanofluid volume concentration significantly enhanced heat transfer and improved thermal properties.