The current study uses the multi-physics COMSOL software and the Darcy–Brinkman–Forchheimer model with a porosity of ε = 0.4 to conduct a numerical study on heat transfer by Cu-TiO2/EG hybrid nano-fluid inside a porous annulus between a zigzagged triangle and different cylinders and under the influence of an inclined magnetic field. The effect of numerous factors is detailed, including Rayleigh number (103 ≤ Ra ≤ 106), Hartmann number (0 ≤ Ha ≤ 100), volume percent of the nano-fluid (0.02 ≤ ϕ ≤ 0.08), and the rotating speed of the cylinder (−4000 ≤ w ≤ 4000). Except for the Hartmann number, which decelerates the flow rate, each of these parameters has a positive impact on the thermal transmission rate.

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MHD Flow of a Hybrid Nano-Fluid in a Triangular Enclosure with Zigzags and an Elliptic Obstacle

This paper aims to present a numerical model for heat transfer intensification in a heat exchanger tube equipped with novel double V-cut twisted tape. The effects of different cut ratios (0.6

Performance intensification of turbulent flow through heat exchanger tube using double V-cut twisted tape inserts

This manuscript presents detailed literature related to the studies of convection heat transfer of nanofluids in different flow regimes for different heat transfer devices like tubes, heat sinks, heat exchangers, etc. Convective heat transfer and friction factor for laminar and turbulent flow regimes are discussed in detail and available studies for transition flow regime are also compiled. Additionally, this review reports Nusselt number and friction factor correlations under different flow regimes with their limitations. Authors have highlighted the effect flow regime, type of nanofluid used, size of the nanoparticle, temperature, clustering, and concentration of nanoparticles (NPs) on the thermal characteristics of nanofluid. The generalized models and correlations developed based on experimental results under different flow regimes are also summarized with their limitations. The remarkable enhancement in heat transfer is mostly reported for turbulent flow regimes, but at the expense of greater pressure drop as compared to laminar flow.

Internal convective heat transfer of nanofluids in different flow regimes: A comprehensive review

1 Bruno, R., Bevilacqua, P., Ferraro, V., Arcuri, N. Second law analysis for the optimization of plate heat exchangers Design Optimization, Entropy Generation Minimization Model, Plate Heat Exchanger, Parametric Study 6, 4, 475-482 10.18280/mmep.060401 Bruno, R., Bevilacqua, P., Ferraro, V., Arcuri, N. (2019). Second law analysis for the optimization of plate heat exchangers. Mathematical Modelling of Engineering Problems, Vol. 6, No. 4, pp. 475-482. https://doi.org/10.18280/mmep.060401

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MHD Generalized Couette Flow and Heat Transfer on Bingham Fluid Through Porous Parallel Plates

This numerical investigation effectively establishes a unique computing exploration for steady magnetohydrodynamic convective streams of tangent hyperbolic nanofluid traveling across a nonlinearly elongating elastic surface with a variable thickness. In addition, the importance of an externally imposed magnetic field of tangent hyperbolic nanofluid is comprehensively analyzed by considering the substantial impact of thermal conductivity and thermal radiation consequences. The governing PDEs (partial differential equations) are transmuted into a nonlinear differential structure of coupled ODEs (ordinary differential equations) using a series of variable similarity transformations. Furthermore, these generated ODEs (ordinary differential equations) are numerically set using a novel revolutionary Runge-Kutta algorithm with a shooting approach constructed in a MATLAB script. In this regard, extensive comparison studies are carried out to validate the acquired numerical results. The interactions between the associated profiles and the relevant parameters are rationally explored and shown using graphs and tabular forms. The velocity distribution declined with improving Weissengberg number We and power-law index m, while the reverse performance can be observed for temperature. As enhancement in Brownian motion, Thermophoretic and radiation parameters significantly rise in temperature distribution. The use of many different technological and industrial systems, including nano-bioconvective systems, nano-droplet evaporation, nano-ink jet printing, and microbial fuel cells, would benefit this research study.

/pdf/insight-into-significance-of-bioconvection-on-mhd-tangent-2gj2ajnq.pdf

Insight into Significance of Bioconvection on MHD Tangent Hyperbolic Nanofluid Flow of Irregular Thickness across a Slender Elastic Surface

Effect of heat generation and heat absorption on natural convection of Cu-water nanofluid in a wavy enclosure under magnetic field

Natural convection among inner corrugated cylinders inside wavy enclosure filled with nanofluid superposed in porous–nanofluid layers

Numerical analysis of flow and heat transfer enhancement in a horizontal pipe with P-TT and V-Cut twisted tape

Numerical study of mixed convection nanofluid in an annulus enclosure between outer rotating cylinder and inner corrugation cylinder

The present work examines numerically the heat transfer and the buoyancy-driven flow within a U–shaped baffled enclosure filled with a nanofluid-saturated porous medium in the presence of an inclined magnetic field using a finite element scheme. The enclosure bottom wall is heated sinusoidally while the two baffles and the inner walls are maintained at a constant cold temperature. The rest walls of the enclosure are kept adiabatic. The parameters under investigation are Hartmann number ( Ha ), volume fraction (φ), Darcy number (Da), Rayleigh number (Ra), nanoparticles aspect ratio (AR), and the angle of applied magnetic field (γ). The results are crucial and illustrate that increasing the values of Ra, Da and the nanoparticles volume fraction enhances the heat transfer while the Hartmann number inversely affects the heat transfer augmentation. Moreover, the average Nusselt number (Nu ave ) increases by increasing the enclosure aspect ratio. For the geometry under consideration and for a better heat transfer rate , it is recommended to choose an AR = 0.6 at Ha = 0 with a 0.1 vol fraction. 

Ammar Abdulkadhim

Papers

Effect of heat generation and heat absorption on natural convection of Cu-water nanofluid in a wavy enclosure under magnetic field

Natural convection among inner corrugated cylinders inside wavy enclosure filled with nanofluid superposed in porous–nanofluid layers

Numerical analysis of flow and heat transfer enhancement in a horizontal pipe with P-TT and V-Cut twisted tape

Numerical study of mixed convection nanofluid in an annulus enclosure between outer rotating cylinder and inner corrugation cylinder

MHD effects on natural convection in a U-shaped enclosure filled with nanofluid-saturated porous media with two baffles