Computational analysis of the aluminum oxide (Al۲O۳) nanoparticles effect on the tubular heat exchanger operation with turbulator

In this paper, the effect of aluminum oxide (Al۲O۳) nanoparticles on the Nusselt number and friction factor within a tubular heat exchanger with turbulator is numerically investigated. Also, the effect of rib turbulator geometry is presented to obtain the highest heat transfer. An innovative and general geometry of angled-rib turbulator has been introduced in such way that, we can simultaneously achieve two common types of angled-rib turbulator, i.e. triangular and trapezoidal ribs with variation in geometric parameters. Maximizing heat transfer coefficient through a tubular heat exchanger is the purpose of this numerical analysis. The considered factor for this analysis is the geometric parameter of turbulator, which include the relative tip width of the rib. This analysis is carried out for a flow with Reynolds numbers of ۴۰۰۰ - ۱۶۰۰۰ at a constant tube diameter of ۵۰ mm. The obtained results reveal that the turbulator effect on the Nusselt number is greater than the variation in the percentage of nanoparticles void fraction; in other words, the effect of the nanoparticles void fraction on the Nusselt number will be diminished in presence of the turbulator.

کلیدواژه ها:

Heat transfer ، pressure drop ، nano-fluid ، single-phase.