Theoretically Investigation of the Heat Transfer Enhancement in a Horizontal Circular Tube

Abstract

This work presents an experimental study to investigate the heat transfer enhancement in a horizontal circular tube use three metal oxide {(ZrO₂ (80nm), Al₂O₃(20nm), CuO (40nm))} distilled water nanofluids with twisted tape. Three types of twisted tapes (typical twisted tape, twisted tape with V-cut and clockwise- counter clockwise twisted tape) were used with twist ratios (TR=4, 6, 8). The studied concentrations of nanofluids are ( =0, 0.01, 0.05, 0.1, 0.5, 1, 2, 3% by volume) under fully developed turbulent flow and uniform heat flux condition.

The numerical analysis was based on finite volume numerical techniques to solve the governing partial differential equations in three dimensions using ANSYS FLUENT commercial CFD software to study the effect of Reynolds number, concentration of nanofluid, concentration of nanofluid, nanofluid types and twist ratio on the heat transfer enhancement, average Nusselt number, velocity profile and skin friction for nanofluid. All the tests were carried out with Reynolds number range (2490-20100) and uniform heat flux (2108- 9280W/m²).

Keywords: ANSYS FLUENT, Nanofluid, Heat Transfer, Circular Tube, Three metal oxide.