Heat transfer enhancement around a finned vertical antenna by means of porous media saturated with Water-Copper nanofluid

Martín, Elena; Sastre, F.; Velázquez, A.; Baı̈ri, A.

doi:10.1016/j.csite.2021.101555

Cited by 12 publications

(3 citation statements)

References 34 publications

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“…The conditions at the regular limits (21) are not adequate to obtain the solutions of the combined system (20), so primary guesstimates for f ′′ (0) , θ ′ (0) , H ′ (0) and ϕ ′ (0) , which expressed by z ′ 1 (0),z 4 (0) , z 3 (0) and z 5 (0) , respectively are automatically suggested. First, the solutions begin in the location of η = 10 −4 to avoid the singularity at η = 0 .…”

Section: Mathematical Techniquementioning

confidence: 99%

“…For both the liquid and solid stages, temperature distributions in two dimensions were determined. A mixture of permeable media and nanofluids was employed to increase the temperature transmission across a normal cylinder that produced a high heat flux 21 . This process indicated that the electrical apparatus functions intended within the parameters set by the manufacturer.…”

Section: Introductionmentioning

confidence: 99%

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Numerical analysis for tangent-hyperbolic micropolar nanofluid flow over an extending layer through a permeable medium

Moatimid,

Mohamed,

Gaber

et al. 2023

Sci Rep

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The principal purpose of the current investigation is to indicate the behavior of the tangent-hyperbolic micropolar nanofluid border sheet across an extending layer through a permeable medium. The model is influenced by a normal uniform magnetic field. Temperature and nanoparticle mass transmission is considered. Ohmic dissipation, heat resource, thermal radiation, and chemical impacts are also included. The results of the current work have applicable importance regarding boundary layers and stretching sheet issues like rotating metals, rubber sheets, glass fibers, and extruding polymer sheets. The innovation of the current work arises from merging the tangent-hyperbolic and micropolar fluids with nanoparticle dispersal which adds a new trend to those applications. Applying appropriate similarity transformations, the fundamental partial differential equations concerning speed, microrotation, heat, and nanoparticle concentration distributions are converted into ordinary differential equations, depending on several non-dimensional physical parameters. The fundamental equations are analyzed by using the Rung-Kutta with the Shooting technique, where the findings are represented in graphic and tabular forms. It is noticed that heat transmission improves through most parameters that appear in this work, except for the Prandtl number and the stretching parameter which play opposite dual roles in tin heat diffusion. Such an outcome can be useful in many applications that require simultaneous improvement of heat within the flow. A comparison of some values of friction with previous scientific studies is developed to validate the current mathematical model.

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Section: Mathematical Techniquementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical analysis for tangent-hyperbolic micropolar nanofluid flow over an extending layer through a permeable medium

Moatimid,

Mohamed,

Gaber

et al. 2023

Sci Rep

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“…The Tiwari-Das nanofluid model has been used in Khan et al (2022) to determine heat transfer induced by a stretching sheet in a nanofluid. Several other works are carried out with this technique combining porous media and nanofluids, including Martin et al (2021), Sheikholeslami (2017b) and Baïri (2020). Porous media saturated by water-copper nanofluid have been used in Sastre et al (2022) for cooling a cylindrical and vertical finned roof-top collective building antenna.…”

Section: Introductionmentioning

confidence: 99%

Thermal behavior of a conical antenna cooled with nanofluid saturated porous media: effects of the cavity’s inclination and aspect ratio

Alilat

Martín²,

Sastre³

et al. 2022

HFF

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Purpose The aim of this work is to determine the average surface temperature of a conical antenna. Its cooling is ensured by means of a nanofluid-saturated porous structure. The volume fraction of the H2O–Cu nanofluid ranges between 0% (pure water) and 5%, whereas the ratio between the thermal conductivity of the used porous materials and that of water (fluid base) varies in the wide 4–41.2 range. The antenna is contained in a coaxial conical closed cavity with a variable distance between the cones, leading to an aspect ratio varying between 0.2 and 0.6. The axis of the assembly is also inclined with respect to the gravity field by an angle varying between 0° (a vertical axis with top of the cone oriented upwards) and 180° (a vertical axis with top of the cone oriented downwards). Design/methodology/approach Simulations have been done by means of the volume control method based on the SIMPLE algorithm. Findings Results of the numerical approach show that the cavity’s aspect ratio and inclination with respect to the gravity field significantly affect the thermal behavior of the active cone. Otherwise, the work confirms that the Maxwell and Brinkman models used to determine the nanofluid’s effective thermal conductivity and viscosity, respectively, are adapted to the considered assembly. Originality/value A new correlation is proposed, allowing the determination of the average surface temperature of the active cone and its correct thermal sizing. This correlation could be used in various engineering fields, including electronics, examined in the present study.

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Magnetic impacts on double diffusion of a non‐Newtonian NEPCM in a grooved cavity: ANN model with ISPH simulations

Alsedias,

Aly

2024

Heat Trans

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Employing phase change materials (PCMs) offers the advantage of storing and releasing thermal energy while ensuring temperature stability. This characteristic makes PCMs valuable for reducing energy usage across various industrial applications. To explore the magnetic effects on double diffusion of a non‐Newtonian nano‐encapsulated phase change material (NEPCM) in a grooved cavity, the present study combined the incompressible smoothed particle hydrodynamics (ISPH) approach with an artificial neural network (ANN) model. The grooved shape is made up of three constructed grooves: triangular, curved, and rectangular grooves. In the cavity's walls, three segments of boundaries are considered as , , and . The ANN model correctly predicted the mean Nusselt number and Sherwood number when merged with current ISPH simulations. The study's novelty lies in exploring three distinct thermal and mass scenarios regarding double diffusion of a non‐Newtonian NEPCM within an innovative grooved domain. The relevant parameters include the fractional‐time derivative , power‐law index , Rayleigh number , Hartmann number , Soret–Dufour numbers (Sr and Du), and Lewis number Le. The obtained simulations present the significance of distinct boundary conditions in changing the velocity field, heat capacity ratio, temperature, and concentration in a grooved cavity. The fractional parameter accelerates the shift from unstable to steady condition. The increase in from 1.1 to 1.5 results in a 44.5% drop in the velocity maximum. Because of the Lorentz effect of a magnetic field, increasing from 0 to 50 reduces the maximum velocity by 20.9%.

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Heat transfer enhancement around a finned vertical antenna by means of porous media saturated with Water-Copper nanofluid

Cited by 12 publications

References 34 publications

Numerical analysis for tangent-hyperbolic micropolar nanofluid flow over an extending layer through a permeable medium

Numerical analysis for tangent-hyperbolic micropolar nanofluid flow over an extending layer through a permeable medium

Thermal behavior of a conical antenna cooled with nanofluid saturated porous media: effects of the cavity’s inclination and aspect ratio

Magnetic impacts on double diffusion of a non‐Newtonian NEPCM in a grooved cavity: ANN model with ISPH simulations

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