Numerical simulation of mixed convection behavior of nanofluid in a microchannel

Javaherdeh, Koroush; Asadi Seddigh, Alireza

doi:10.30506/ijmep.2025.2061861.2018

Numerical simulation of mixed convection behavior of nanofluid in a microchannel

Authors

Koroush Javaherdeh ¹

Alireza Asadi seddigh ²

¹ Faculty of Mechanical Engineering,University of Guilan,Rasht,Iran

² University of Guilan, Faculty of Mechanical Engineering, Rasht, Iran.

10.30506/ijmep.2025.2061861.2018

Abstract

In this paper, numerical simulation of the combined displacement behavior of two nanofluids TiO2 and ZnO in a microchannel with a rectangular cross-section and a laminar flow regime has been investigated. In this paper, the desired network was read after design by Fluent software and examined in two-dimensional mode with an accuracy of (2dp). The implicit solution option has been used for the governing equations. The momentum and energy equations have been discretized using the second-order upstream method. The pressure discretization has also been done using standard interpolation. The coupled pressure-velocity equations have been applied with the SIMPLE algorithm. The governing equations of this paper are briefly the continuity equation, momentum in two directions, energy, etc. The results showed that the heat transfer coefficient of water-TiO2 nanofluid increases by about 0.85% with increasing volume fraction. This increase in water-ZnO nanofluid reaches 1%. The results also show that the heat transfer coefficient of water-titanium dioxide nanofluid increases by about 9% with increasing Reynolds number, while this increase reaches 136% from Re=300 to Re=1460.

Keywords

Combined convection

Nanofluid

Microchannel

Richardson number

Groshof number

Knudsen number

Subjects