A comprehensive review on the natural, forced, and mixed convection of non-Newtonian fluids (nanofluids) inside different cavities

Yang, Linjun; Du, Kai

doi:10.1007/s10973-019-08987-y

Cited by 105 publications

(24 citation statements)

References 137 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Reynolds numbers range from 0-16950 in accordance with the airflow velocity at the entrance, with ranges at 0, 0.5, 1, 1.5 m/s). The configurations of test models and the studied parameters are shown in Table (1) in detail.…”

Section: Test Models and Configurationmentioning

confidence: 99%

“…Many engineering applications, such as heat exchangers, electronic system cooling, air conditioning, nuclear reactor cooling, industrial furnaces and solar energy storage, require deep investigation for convective heat transfer system. Different methods, such as Nano fluids, functionally graded materials and extrude baffles, are widely used to enhance heat transfer which is useful to keep the temperature-dependent material properties at designed ranges, increase efficiency of cooling units or reduce pump power of heat exchanger [1][2][3][4][5]. Many experimental and theoretical investigations are performed to study the heat transfer performance in enclosures with baffles.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental and Numerical Investigation of Convection Heat Transfer in an Enclosure With a Vertical Heated Block and Baffles

Aun

Ghadhban

Jehhef

2021

Journal of Thermal Engineering

View full text Add to dashboard Cite

In this study, the natural and forced convection heat transfer in an enclosure with vertical heated block and baffles are experimentally and numerically investigated. The enclosure walls are kept as adiabatic, and the heating block contains extended baffles and receives heat flux. The effect of heat flux, Reynolds number and baffle configuration on the heat transfer characteristics and flow behaviour inside the enclosure is examined. The configuration parameter for natural and forced convection involves three heating block models, namely, block without baffle (plain), block with baffles and block with partially cut baffles. The widths of baffles are 2.5, 5 and 10 cm for the block with baffle case, and the width of partially cut baffle is 5 cm. The heat flux (q) ranges from 240 w/m 2 to 1425 w/m 2 for all the models. The Reynolds number (Re) ranges from 5650 to 15950 for forced convection heat transfer. In the numerical part, a finite volume method (via Ansys Fluent) is used to solve the governing equations. Result shows that the increase in baffle width has no remarkable effect on the heat transfer, and the partially cut baffles provide an enhancement of approximately 30% compared with the plain heating block. The baffle cases have an evident effect in reducing the block surface temperature by approximately 11% compared with the plain case at Re = 0 and q = 240 w/m 2 . Empirical correlations for the block with baffles are obtained for each heat flux to predict the average Nusselt number.

show abstract

Section: Test Models and Configurationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation of Convection Heat Transfer in an Enclosure With a Vertical Heated Block and Baffles

Aun

Ghadhban

Jehhef

2021

Journal of Thermal Engineering

View full text Add to dashboard Cite

show abstract

“…A comprehensive review article (Rahimi et al , 2019) was recently dedicated on natural convection (in absence of forced or mixed convection) for various geometries. A few review articles depicting the role of mixed convection in thermal processes exist in literature (Togun et al , 2014; Dawood et al , 2015; Izadi et al , 2019; Esfe et al , 2019; Yang and Du, 2020). However, these review articles are mainly confined on mixed convection involving nanofluids (Izadi et al , 2019; Esfe et al , 2019; Yang and Du, 2020) and annular geometries (Togun et al , 2014; Dawood et al , 2015).…”

Section: Introductionmentioning

confidence: 99%

“…A few review articles depicting the role of mixed convection in thermal processes exist in literature (Togun et al , 2014; Dawood et al , 2015; Izadi et al , 2019; Esfe et al , 2019; Yang and Du, 2020). However, these review articles are mainly confined on mixed convection involving nanofluids (Izadi et al , 2019; Esfe et al , 2019; Yang and Du, 2020) and annular geometries (Togun et al , 2014; Dawood et al , 2015). The current review article analyzes mixed convection works in various cavities (open and closed) based on kinematically and thermally induced walls, thermal or kinematic conditions of solid objects within the cavities and kinematics of flow field (air) through various orientations of the ventilation ports and proposes 10 unified models with associated flow and heat transfer characteristics as a first attempt.…”

Section: Introductionmentioning

confidence: 99%

A comprehensive review on mixed convection for various patterns of kinematically and thermally induced scenarios within cavities

Lukose

Basak

2021

HFF

View full text Add to dashboard Cite

Purpose The purpose of this paper is to address various works on mixed convection and proposes 10 unified models (Models 1–10) based on various thermal and kinematic conditions of the boundary walls, thermal conditions and/ or kinematics of objects embedded in the cavities and kinematics of external flow field through the ventilation ports. Experimental works on mixed convection have also been addressed. Design/methodology/approach This review is based on 10 unified models on mixed convection within cavities. Models 1–5 involve mixed convection based on the movement of single or double walls subjected to various temperature boundary conditions. Model 6 elucidates mixed convection due to the movement of single or double walls of cavities containing discrete heaters at the stationary wall(s). Model 7A focuses mixed convection based on the movement of wall(s) for cavities containing stationary solid obstacles (hot or cold or adiabatic) whereas Model 7B elucidates mixed convection based on the rotation of solid cylinders (hot or conductive or adiabatic) within the cavities enclosed by stationary or moving wall(s). Model 8 is based on mixed convection due to the flow of air through ventilation ports of cavities (with or without adiabatic baffles) subjected to hot and adiabatic walls. Models 9 and 10 elucidate mixed convection due to flow of air through ventilation ports of cavities involving discrete heaters and/or solid obstacles (conductive or hot) at various locations within cavities. Findings Mixed convection plays an important role for various processes based on convection pattern and heat transfer rate. An important dimensionless number, Richardson number (Ri) identifies various convection regimes (forced, mixed and natural convection). Generalized models also depict the role of “aiding” and “opposing” flow and combination of both on mixed convection processes. Aiding flow (interaction of buoyancy and inertial forces in the same direction) may result in the augmentation of the heat transfer rate whereas opposing flow (interaction of buoyancy and inertial forces in the opposite directions) may result in decrease of the heat transfer rate. Works involving fluid media, porous media and nanofluids (with magnetohydrodynamics) have been highlighted. Various numerical and experimental works on mixed convection have been elucidated. Flow and thermal maps associated with the heat transfer rate for a few representative cases of unified models [Models 1–10] have been elucidated involving specific dimensionless numbers. Originality/value This review paper will provide guidelines for optimal design/operation involving mixed convection processing applications.

show abstract

“…Thermophysical features such as viscosity, specific heat and thermal conduction of such types fluids are highly dependent on influential constraints, namely particle size, temperature, base fluid, particle concentration and materials of nanoparticles. Different researchers across the globe have made investigations on nanofluids under various assumptions and conditions to describe the real behavior and practical implications of these fluids (Yang and Du 2019;Mehryan et al 2019). Recently, the combination of fluids with nanopowders, namely nanofluids which fill the cavities due to far potential in control of normal convection form of heat transfer, has found great interest among those who work on energy systems.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer management of hybrid nanofluid including radiation and magnetic source terms within a porous domain

et al. 2020

View full text Add to dashboard Cite

Natural convected aqueous-based MWCNT + Fe 3 O 4 nanopowder through a permeable cavity employing Lorentz field impacts is illustrated in this work. CVFEM-based technique was developed to simulate the considered physical problem. The source of Darcy in the momentum equation is introduced by the implementation of non-Darcy theory. Further, the radiative heat transportation is analyzed. The thermal contours and flow streamlines elaborate the thermofluid features of nanofluid under variable strength of magnetic field and media permeability conditions. The mutual impact of radiation parameter, Rayleigh number, permeability, and magnetic force on Nu has also been analyzed. The outcomes revealed that the Hartmann number suppresses the natural convection and promotes conduction. Convection is the dominating mode when Ha is zero. As Ha increases from 0 to 60, 66% increment in Ψ can be reported when Ra = 10 5 . With rise of Da from 0.01 to 100, Ψ max augments about 5.88% and 80% when Ha = 60 and 0, respectively. To achieve greater influence, Da, Ha should be reduced. In the highest level of Ra, Da and Ha = 0, Nu for Rd = 0.8 is 2.06 higher than that of Rd = 0. Nu declines about 11.97% with rise of Lorentz force when Da = 0.01. The impact of Da becomes more sensible when Lorentz force has been imposed.

show abstract

A comprehensive review on the natural, forced, and mixed convection of non-Newtonian fluids (nanofluids) inside different cavities

Cited by 105 publications

References 137 publications

Experimental and Numerical Investigation of Convection Heat Transfer in an Enclosure With a Vertical Heated Block and Baffles

Experimental and Numerical Investigation of Convection Heat Transfer in an Enclosure With a Vertical Heated Block and Baffles

A comprehensive review on mixed convection for various patterns of kinematically and thermally induced scenarios within cavities

Heat transfer management of hybrid nanofluid including radiation and magnetic source terms within a porous domain

Contact Info

Product

Resources

About