Abstract
In this study, the convective mode heat transfer phenomena of bi-phase elasticoviscous (non-Newtonian) nanofluid is quantified by forcefully flowing it through a specially designed microchannel test section. The test section, which is rectangularly cross-sectioned and annexed internally with cylindrical needle ribs is numerically investigated by considering the walls to be maintained at a constant temperature, and to be susceptible to a magnetizing force field. The governing system-state equations are numerically deciphered using control volume procedure and SIMPLEC algorithm. With the Reynolds number (Re) varying in the turbulent range from 3000 to 11,000, the system-state equations are solved using the Eulerian–Eulerian monofluid Two-Phase Model (TPM). For the purpose of achieving an apt geometry based on the best thermo-hydraulic behavior, an optimization study must be mandatory. The geometry of the cylindrical rib consists of h (10 × 10−3, 15 × 10−3, 20 × 10−3), p (1.0, 1.5), and d (8 × 10−3, 10 × 10−3, 12 × 10−3), which, respectively, defines the height, pitch, and diameter of the obstacles, with the dimensions placed within the braces being quantified in mm. The results demonstrated that the magnetic field leads to an enhanced amount of average Nusselt number (Nuav) in contrast with the occurrence at B = 0.0. This is due to the that the magnetic field pushes nanoparticles towards the bottom wall. It was found that B = 0.5 T has the maximum heat transfer compared with the other magnetic fields. The channel with h = 15 μm height leads to the maximum value of Nuav at all studied Re for constant values of d and h. The channel with p = 1.5 μm results in the maximum value of Nuav at all studied Re for constant values of d and h. The microchannel with d = 8 μm, p = 1.5 μm, and h = 15 μm in the presence of the magnetic field with B = 0.5 T is the best geometry in the present work.
Highlights
The limelight on energy conserving Non-Newtonian fluidation and sustainability has been drawing widespread attention to the modified heat transfer and flow behavior through different techniques to accomplish superior thermal performance
The results demonstrated that the thermal-hydraulic performance evaluation criteria (PEC) values related to each studied case had a fairly similar trend for the discussed span of inlet velocity
The prime purpose of the present numerical study is to assess the influence of diversified corrugation configurations on the hydrothermal performance of an elasticoviscous nanofluid flowing inside a microchannel prone to a magnetic field
Summary
The limelight on energy conserving Non-Newtonian fluidation and sustainability has been drawing widespread attention to the modified heat transfer and flow behavior through different techniques to accomplish superior thermal performance. A numerical simulation on the turbulent flow was performed by Parsaiemehr et al [29] in which a rectangular channel, containing water/Al2O3 nanofluid, was consumed to evaluate the essence of the attack angle of ribs (0 to 180◦), percentage particle volume proportion (0–4), and Reynolds number (15,000 to 30,000) on to heat transfer. The goal of the present article focuses on the finite volume method based on numerical analysis of the thermo-hydraulic attribute of an elastoviscous fluid flowing through a microchannel of varied corrugation geometries that is vulnerable to magnetic flux density. For this purpose, six different fins structure were studied. The Eulerian–Eulerian monofluid Two-Phase Model (TPM) was put to use for modeling bi-phase flow [49,50,51,52,53,54,55,56,57,58,59,60]
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