Heat Transfer Enhancement of TiO2/Water Nanofluid at Laminar and Turbulent Flows: A Numerical Approach for Evaluating the Effect of Nanoparticle Loadings

Abstract

Titania-based nanofluid flowing inside a circular tube under the boundary condition of a horizontal uniformly heated wall was investigated numerically for both laminar and turbulent flows. In this work, an innovative numerical method using an Eulerian approach for the two-phase mixture model was used to simulate the flow and convective heat transfer characteristics. The effect of nanoparticle loading and Reynolds number on the flow and heat transfer characteristics was observed. The Reynolds number was 500 and 1200 for laminar flow, while for turbulent flow, the Reynolds number was varied in the range from 4000 to 14,000. A comparison with the established empirical correlations was made. The results clearly showed at the laminar and turbulent flows that the existing nanoparticles provided a considerable enhancement in the convective heat transfer. For laminar flow, the numerical results found that the enhancement in the convective heat transfer coefficient of nanofluids were 4.63, 11.47, and 20.20% for nanoparticle loadings of 0.24, 0.60, and 1.18 vol.%, respectively. On the other hand, for turbulent flow, the corresponding heat transfer increases were 4.04, 10.33, and 21.87%.

Thermal transportation analysis of nanoliquid squeezed flow past a sensor surface with MCWCNT and SWCNT

“…To solve the Equations (13) to (14), we guess the values of y 3 , y 5 which are not given at the initial conditions. All initial conditions are obtained, and Equations (13) to (14) are resolved and integrated by utilizing RKF with the consecutive iterative process.…”

“…Ashorynejad and Zarghami reported the MHD flow of Cu‐water nanofluid through a porous channel. Afterward, voluminous theoretical and experimental exertions were established to scrutinize the diverse aspects of nanofluids (see Parsaiemehr et al) …”

“…Afterward, voluminous theoretical and experimental exertions were established to scrutinize the diverse aspects of nanofluids (see Parsaiemehr et al). [12][13][14][15][16][17][18][19][20][21][22][23] Investigation of boundary layer flows influenced by a sensor surface has attained a considerable thoughtfulness of researchers throughout the former few eras. Khaled and Vafai 24 discoursed about hydromagnetic squeezed flow over a sensor surface.…”

Impacts of Heat-Conducting Solid Wall and Heat-Generating Element on Free Convection of Al2O3/H2O Nanofluid in a Cavity with Open Border

“…Nowadays, for an intensification of heat transfer within different engineering systmes the nanosized metal or metal oxide particles are used [11][12][13]. Different experimental studies showed that an inclusion of nanoparticles of low concentration can improve the heat transfer performance inside the system [14,15].…”

Enhancing the Heat Transfer in an Active Barocaloric Cooling System Using Ethylene-Glycol Based Nanofluids as Secondary Medium

“…In 1995, Choi [56] presented the scientific community with the concept of nanofluids, and the discovery was revolutionary. Over the years, nanofluids attracted many scientists from all over the world, who started to test them in wide-ranging applications [57][58][59][60][61][62][63]. Therefore, the use of nanofluids seems to be very promising in enhancing the thermal conductivity of a base fluid, but attention must be paid to the synthesis and the characterizations of them.…”