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1

Prabu, M., D. Kulandaivel, K. Ramesh, and M. Shoban Babu. "Numerical Heat Transfer Analysis of Ag-Doped- CuO Nanofluids in Radiator with UDF codes in Ansys fluent." International Journal for Research in Applied Science and Engineering Technology 11, no. 1 (January 31, 2023): 1073–80. http://dx.doi.org/10.22214/ijraset.2023.48762.

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Анотація:
Abstract: A nanofluid is a fluid that accommodates nanometer-sized particles (10–9 ), called nanoparticles. These fluids implement a colloidal suspension of nanoparticles in a base fluid. The nanoparticles used in nanofluids are frequently made of metals, oxides, carbides, or carbon nanotubes. Usual base fluids include water, ethylene glycol, and engine oil. In this program, silver-doped copper oxide is used as nanoparticles. This nanoparticle has been prepared by the green synthesis method. The radiator's job is to eliminate heat from the engine. The effect of using nanofluids in a vehicle radiator was investigated. Increasing the nanoparticle volume concentration leads to improved heat transfer. The radiator size using nanofluids is revised to lose the same heat as water. The simplest option is to treat the nanofluid as a fluid with changed properties. Then, all that is needed is to recalculate the fluid properties and use any CFD software to simulate flow and heat transfer. And writing a UserDefined Function (UDF) for CFD Modeling Using a C programme or a C function that can be dynamically loaded with ANSYS Fluent to enhance its standard features
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2

Alhummiany, H. "Novel Nanofluid Based on Water-Loaded Delafossite CuAlO2 Nanowires: Structural and Thermal Properties." Journal of Nanomaterials 2018 (2018): 1–6. http://dx.doi.org/10.1155/2018/4076960.

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Анотація:
Ultra-high cooling performance is a crucial requirement of many thermomechanical systems, such as microelectronic devices, engine cooling systems, nuclear power systems, chemical reactors, and refrigeration systems. Recent experimental results reveal the potential thermal properties of suspended nanometallics in conventional fluids. In this study, the facile synthesis of one-dimensional delafossite CuAlO2 nanowires by microwave hydrothermal treatment was presented. A novel type of nanofluid consisting of CuAlO2 nanowires suspended in distilled water at various volume fractions (0.0, 0.2, 0.4, and 0.6 wt%) was successfully synthesized using an easily scalable sonication method. The microstructures of as-synthesized CuAlO2 were investigated by adopting X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), and field-emission scanning electron microscopy (FESEM). Furthermore, the thermal conductivity and specific heat capacity of water-loaded nanofluid were measured at different volume fractions and temperatures. The results reveal a significant increase in thermal conductivity with increasing CuAlO2 loading levels and temperatures. The obtained results propound the fact that water-loaded delafossite CuAlO2 nanowires-based nanofluid is a promising candidate for future industrial applications.
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3

Rudrabhiramu, Rokkala, Kiran Kumar Kupireddi, and Kuchibotla Mallikarjuna Rao. "Study of Thermal Characteristics Augmentation of the Aluminium Oxide Nano Fluid with Different Base Fluids." International Journal of Heat and Technology 39, no. 6 (December 31, 2021): 2000–2005. http://dx.doi.org/10.18280/ijht.390639.

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Анотація:
Nanofluids have been widely studied over the past decade due to their extremely promising findings in terms of thermal transfer improvement techniques. These fluids have a number of potential benefits, including enhanced thermal resistance and heat transfer characteristics. The current study examines the numerical behavior of the square cavity loaded with a nanofluid for thermal enhancement under three different base fluid conditions (water, water-EG mixture, and EG). This square cavity edge is maintained at a length of 8 cm. Side edges are kept at constant high and low-temperature conditions, and bottom sides are insulated. Additionally, it is found that when the base fluid's composition changes between EG to water, heat transmission is increased. The (hnfhbf/) ratio improves when the percent vol density of Al2O3 nanoparticle increases, and an increase of up to 4.5 percent is possible. Consequently, the paper concluded that the use of nanofluids aids in heat transfer enhancement.
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4

Lanjewar, Abhishek, Bharat Bhanvase, Divya Barai, Shivani Chawhan, and Shirish Sonawane. "Intensified Thermal Conductivity and Convective Heat Transfer of Ultrasonically Prepared CuO–Polyaniline Nanocomposite Based Nanofluids in Helical Coil Heat Exchanger." Periodica Polytechnica Chemical Engineering 64, no. 2 (June 3, 2019): 271–82. http://dx.doi.org/10.3311/ppch.13285.

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Анотація:
In this study, investigation of convective heat transfer enhancement with the use of CuO–Polyaniline (CuO–PANI) nanocomposite basednanofluid inside vertical helically coiled tube heat exchanger was carried out experimentally. In these experiments, the effects of different parameters such as Reynolds number and volume % of CuO–PANI nanocomposite in nanofluid on the heat transfer coefficient of base fluid have been studied. In order to study the effect of CuO–PANI nanocomposite based nanofluid on heat transfer, CuO nanoparticles loaded in PANI were synthesized in the presence of ultrasound assisted environment at different loading concentration of CuO nanoparticles (1, 3 and 5 wt.%). Then the nanofluids were prepared at different concentrations of CuO–PANI nanocomposite using water as a base fluid. The 1 wt.% CuO–PANI nanocomposite was selected for the heat transfer study for nanofluid concentration in the range of 0.05 to 0.3 volume % and Reynolds number range of was 1080 to 2160 (±5). Around 37 % enhancement in the heat transfer coefficient was observed for 0.2 volume % of 1 wt.% CuO–PANI nanocomposite in the base fluid. In addition, significant enhancement in the heat transfer coefficient was observed with an increase in the Reynolds number and percentage loading of CuO nanoparticle in Polyaniline (PANI).
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5

Kumar, P. Manoj, Rajasekaran Saminathan, Mohammed Tharwan, Haitham Hadidi, P. Michael Joseph Stalin, G. Kumaresan, S. Ram, et al. "Study on Sintered Wick Heat Pipe (SWHP) with CuO Nanofluids under Different Orientation." Journal of Nanomaterials 2022 (August 25, 2022): 1–12. http://dx.doi.org/10.1155/2022/7158228.

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Анотація:
The current work investigates the performance of cylindrical-shaped sintered wick heat pipe at different orientations, numerically. The results are compared and validated with the experimental findings. The study is extended by using a nanofluid (comprising nano-Curo in deionized water) as a working fluid and the thermal performance of heat pipe with deionized (DI) water has been compared with that of heat pipe with nanofluid (containing various concentrations of CuO nanoparticles in DI water). During the investigation, the nanofluid with 1.0 weight fraction of CuO nanopaticles found to be optimum, which has produced the better results. The numerical analysis has been carried out to study the temperature difference, fluid velocity, and pressure drop of the sintered wick heat pipe using the commercial CFD software, Ansys Fluent R14.5. The computational results are observed to be much closer to the experimental data, and the vapor velocity at the heat pipe’s core has been determined to be 64.54% higher than the liquid flow over the wick structure. Interestingly, the heat pipe pressure drop has been reduced by adding CuO nanoparticles to the working fluid. Finally, the heat pipe loaded with a 1.0% concentration of nano-CuO in nanofluid has exhibited a notable reduction in pressure drop of 35.33%.
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6

Alhummiany, H. "Corrigendum to “Novel Nanofluid Based on Water-Loaded Delafossite CuAlO2 Nanowires: Structural and Thermal Properties”." Journal of Nanomaterials 2018 (July 19, 2018): 1. http://dx.doi.org/10.1155/2018/9583485.

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7

Sannad, Mohamed, Ahmed Kadhim Hussein, Awatef Abidi, Raad Z. Homod, Uddhaba Biswal, Bagh Ali, Lioua Kolsi, and Obai Younis. "Numerical Study of MHD Natural Convection inside a Cubical Cavity Loaded with Copper-Water Nanofluid by Using a Non-Homogeneous Dynamic Mathematical Model." Mathematics 10, no. 12 (June 15, 2022): 2072. http://dx.doi.org/10.3390/math10122072.

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Анотація:
Free convective flow in a cubical cavity loaded with copper-water nanofluid was examined numerically by employing a non-homogeneous dynamic model, which is physically more realistic in representing nanofluids than homogenous ones. The cavity was introduced to a horizontal magnetic field from the left sidewall. Both the cavity’s vertical left and right sidewalls are preserved at an isothermal cold temperature (Tc). The cavity includes inside it four isothermal heating blocks in the middle of the top and bottom walls. The other cavity walls are assumed adiabatic. Simulations were performed for solid volume fraction ranging from (0 ≤ ϕ ≤ 0.06), Rayleigh number varied as (103 ≤ Ra ≤ 105), the Hartmann number varied as (0 ≤ Ha ≤ 60), and the diameter of nanoparticle varied as (10 nm ≤ dp ≤ 130 nm). It was found that at (dp = 10 nm), the average Nusselt number declines when Ha increases, whereas it increases as (Ra) and (ϕ) increase. Furthermore, the increasing impact of the magnetic field on the average Nusselt number is absent for (Ra = 103), and this can be seen for all values of (ϕ). However, when (dp) is considered variable, the average Nusselt number was directly proportional to (Ra) and (ϕ) and inversely proportional to (dp).
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8

Sahota, Lovedeep, Swati Arora, Harendra Pal Singh, and Girijashankar Sahoo. "Thermo-physical characteristics of passive double slope solar still loaded with MWCNTs and Al2O3-water based nanofluid." Materials Today: Proceedings 32 (2020): 344–49. http://dx.doi.org/10.1016/j.matpr.2020.01.600.

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9

Mourad, Abed, Aissa Abderrahmane, Obai Younis, Riadh Marzouki, and Anas Alazzam. "Numerical Simulations of Magnetohydrodynamics Natural Convection and Entropy Production in a Porous Annulus Bounded by Wavy Cylinder and Koch Snowflake Loaded with Cu–Water Nanofluid." Micromachines 13, no. 2 (January 26, 2022): 182. http://dx.doi.org/10.3390/mi13020182.

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Анотація:
The current paper presents a numerical study of the magnetohydrodynamics natural convection and entropy production of Cu–water nanofluid contained in a porous annulus between a heated Koch snowflake and wavy cylinder with lower temperature with respect to the Koch snowflake. The numerical algorithm is based on the Galerkin Finite Element Method. The impacts of Rayleigh number (Ra = 103, 104, 105, and 106), Hartman number (Ha = 0, 25, 50, and 100), Darcy number (Da = 10−2, 10−3, 10−4, and 10−5), nanoparticle volumetric fraction (φ = 2%, 3%, 4%, and 5%), and the undulations number of the outer wavy cylinder (three cases) on the distributions of isotherms, streamlines, mean Nusselt number (Nuavg), as well as on total entropy production and Bejan number are thoroughly examined. The computational outcomes disclose that dispersing more Cu nanoparticles in the base fluid and creating a flow with higher intensity inside the annulus by raising the Rayleigh number bring about a boosted natural convective flow in the cavity, which improves the heat transmission rate. In addition, it can be noted that owing to the peculiar form of the heated Koch snowflake, nanofluid gets trapped between the angled parts, resulting in uneven temperature profiles with higher values in these places.
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10

Mannu, Rashmi, Vaithinathan Karthikeyan, Murugendrappa Malalkere Veerappa, Vellaisamy A. L. Roy, Anantha-Iyengar Gopalan, Gopalan Saianand, Prashant Sonar, et al. "Facile Use of Silver Nanoparticles-Loaded Alumina/Silica in Nanofluid Formulations for Enhanced Catalytic Performance toward 4-Nitrophenol Reduction." International Journal of Environmental Research and Public Health 18, no. 6 (March 15, 2021): 2994. http://dx.doi.org/10.3390/ijerph18062994.

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Анотація:
The introduction of toxic chemicals into the environment can result in water pollution leading to the degradation of biodiversity as well as human health. This study presents a new approach of using metal oxides (Al2O3 and SiO2) modified with a plasmonic metal (silver, Ag) nanoparticles (NPs)-based nanofluid (NF) formulation for environmental remediation purposes. Firstly, we prepared the Al2O3 and SiO2 NFs of different concentrations (0.2 to 2.0 weight %) by ultrasonic-assisted dispersion of Al2O3 and SiO2 NPs with water as the base fluid. The thermo-physical (viscosity, activation energy, and thermal conductivity), electrical (AC conductivity and dielectric constant) and physical (ultrasonic velocity, density, refractive index) and stability characteristics were comparatively evaluated. The Al2O3 and SiO2 NPs were then catalytically activated by loading silver NPs to obtain Al2O3/SiO2@Ag composite NPs. The catalytic reduction of 4-nitrophenol (4-NP) with Al2O3/SiO2@Ag based NFs was followed. The catalytic efficiency of Al2O3@Ag NF and SiO2@Ag NF, for the 4-NP catalysis, is compared. Based on the catalytic rate constant evaluation, the catalytic reduction efficiency for 4-NP is found to be superior for 2% weight Al2O3@Ag NF (92.9 × 10−3 s−1) as compared to the SiO2@Ag NF (29.3 × 10−3 s−1). Importantly, the enhanced catalytic efficiency of 2% weight Al2O3@Ag NF for 4-NP removal is much higher than other metal NPs based catalysts reported in the literature, signifying the importance of NF formulation-based catalysis.
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11

Parsa, Seyed Masoud, Amir Rahbar, M. H. Koleini, Sadegh Aberoumand, Masoud Afrand, and Majid Amidpour. "A renewable energy-driven thermoelectric-utilized solar still with external condenser loaded by silver/nanofluid for simultaneously water disinfection and desalination." Desalination 480 (April 2020): 114354. http://dx.doi.org/10.1016/j.desal.2020.114354.

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12

Taloub, Djedid, Adelkarim Bouras, and Zied Driss. "Numerical Investigation of Heat Transfer with Natural Convection in a Regularly Heated Elliptical Cylinder Submerged in a Square Fence Loaded With a Nanofluid." International Journal of Mathematical Models and Methods in Applied Sciences 15 (December 16, 2021): 223–32. http://dx.doi.org/10.46300/9101.2021.15.29.

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Анотація:
During this first paper, numerical research from the natural convection of steady-state laminar heat transfer into a horizontal ring within a heated internal elliptical surface and a cold external square surface is presented. A Cu - water nanofluid, traverses this annular space. For different thermal Rayleigh numbers varying from 103 to 2.5x105 and different volume fractions from the nanoparticles. The arrangement from equations directing the problem was resolved numerically with the Fluent computational language founded on the finite volume approach. Based approaching the Boussinesq approach. The interior and exterior surfaces from the two cylinders are maintained at a fixed temperature. We investigated the impacts of various thermal Rayleigh numbers, the volume fraction from the nanoparticles, and the effect of the eccentricity of the internal cylinder on the natural convection. The results are shown within the figure of isocurrents, isotherms, and mean and local Nusselt numbers. The objective of this investigation is to examine the impact of different parameters on the heat transfer flow.
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13

Alhummiay, Haya. "Synthesis of Water Loaded CuAlO2 Nanoplatelet Based New Generation Nanofluid Using Hydrothermal Approach: A Detailed Insight of Structural, Electrical, and Viscous Properties." Science of Advanced Materials 10, no. 10 (October 1, 2018): 1389–96. http://dx.doi.org/10.1166/sam.2018.3332.

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14

Younis, Obai, Milad Alizadeh, Ahmed Kadhim Hussein, Bagh Ali, Uddhaba Biswal, and Emad Hasani Malekshah. "MHD Natural Convection and Radiation over a Flame in a Partially Heated Semicircular Cavity Filled with a Nanofluid." Mathematics 10, no. 8 (April 18, 2022): 1347. http://dx.doi.org/10.3390/math10081347.

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Анотація:
The numerical analysis of MHD-free convective heat transfer and its interaction with the radiation over a heated flame inside a porous semicircular cavity loaded with SWCNTs–water nanofluid was explored for the very first time in the present work. The two circular arcs of the upper wall of the enclosure were preserved at a constant cold temperature, whereas the middle region of it was considered adiabatic. The midland region of the lower wall was heated partially, while other regions were also assumed adiabatic. An internal hot flame was included inside the cavity, while the cavity was exposed to a magnetic field. The results were illustrated for Hartmann number (0 ≤ Ha ≤ 100), Rayleigh number (104 ≤ Ra ≤ 106), heated region length (0.1 ≤ L ≤ 0.3), solid volumetric fraction (0 ≤ φ ≤ 0.04), Darcy number (10−3 ≤ Da ≤ 10−5) and radiation parameter (0 ≤ Rd ≤ 1). It was found that decreasing L is the best option for enhancing natural convection. Moreover, it was noted that (Nuout) is directly proportion to (Ra), (ϕ), (Rd) and (Da) increase. In contrast, it was in reverse proportion to (Ha). Furthermore, the results showed that augmentation of about (4%) and a decrement of (56.55%) are obtained on the average (Nu) on the heated length by increasing the radiation and the Hartmann number, respectively. Moreover, raising the radiation number from (0 to 1) causes an augmentation of about (73%) in the average (Nu) of the heated flame. Results also indicated that increasing the Hartmann number will cause a decrement of about (82.4%) of the maximum velocity profile in the vertical direction.
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15

Kode, Venkateswara R., David J. Stuckenberg, Erick K. Went, Owen M. Erickson, and Ethan Plumer. "Techno-Economic Analysis of Atmospheric Water Generation by Hybrid Nanofluids to Mitigate Global Water Scarcity." Liquids 2, no. 3 (August 14, 2022): 183–95. http://dx.doi.org/10.3390/liquids2030012.

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Анотація:
Globally, multiple efforts are being made to develop active atmospheric water generation (AWG) or atmospheric water extraction (AWE) systems, particularly using direct air-cooling technology to produce water from ambient air. However, this legacy technique is highly energy-intensive; it can only be operated when the local dew point is above the freezing point of water, and does not scale to create enough water to offer solutions for most industries, services, or agriculture. Liquid-desiccant-based AWG methods show promising performance advantages, and offer a versatile approach to help address the thermodynamics, health risks, and geographic constraints currently encountered by conventional active AWG systems. In this study, we performed a techno-economic analysis of a liquid-desiccant-based AWG system with a continuous operating style. An energy balance was performed on a single design point of the AWG system configuration while using a LiCl liquid desiccant loaded with multiwalled carbon nanotubes (MWCNTs). We showed that the MWCNTs can be doped in LiCl for effective heat transfer during water desorption, resulting in lowering of the sensible heat load by ≈49% on the AWG system. We demonstrated that the specific energy consumption (SEC) can currently be obtained as low as 0.67 kWh per US gallon, while changing the inlet desiccant stream concentration of MWCNT-doped LiCl under the given conditions. While the production cost of water (COW) showed a significant regional dependency, economic analysis revealed that water can be produced at a minimum selling price of USD 0.085 per US gallon, based on the 2021 annual average wholesale electricity cost of USD 0.125 per kWh in the U.S.A., thereby providing a strong foundation for future research to meet desirable and competitive water costs by 2026, but before 2031.
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16

Moreira, Tiago Augusto, Pablo Fariñas Alvariño, Luben Cabezas-Gómez, and Gherhardt Ribatski. "Experimental and numerical study of slightly loaded water alumina nanofluids in the developing region of a 1.1 mm in diameter pipe and convective enhancement evaluation." International Journal of Heat and Mass Transfer 115 (December 2017): 317–35. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2017.08.028.

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17

Sahota, Lovedeep, V. S. Gupta, and G. N. Tiwari. "Analytical Study of Thermo-Physical Performance of Nanofluid Loaded Hybrid Double Slope Solar Still." Journal of Heat Transfer 140, no. 11 (August 3, 2018). http://dx.doi.org/10.1115/1.4040782.

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Анотація:
In the present paper, efforts has been made to study the thermophysical performance (properties) of N photovoltaic thermal flat plate collectors coupled with double slope solar still (N-PVT-FPC-DSSS) and operating with helically coiled heat exchanger. The analysis has been performed for the optimized concentration of NPs (Al2O3 0.107%; TiO2 0.093%; and CuO 0.131%) and optimized basin fluid (base fluid/nanofluid) mass (50 kg) for different weather conditions of the month May (New Delhi). The Nusselt number (Nu) and Rayleigh number (Ra) are functions of thermophysical properties of nanofluids and strongly influence the natural convective heat transfer coefficient in the solar still. Therefore, these numbers have also been investigated for base fluid and Al2O3, TiO2, and CuO–water-based nanofluids in detail. Significant enhancement in natural convective heat transfer coefficient (Al2O3 67.03%; TiO2 63.56%; and CuO 71.23%) and Nusselt number (Al2O3 119.72%; TiO2 98.64%; CuO 151.62%) has been observed. The monthly productivity of the hybrid system found to be higher by using nanofluids (320.77 kg TiO2; 338.23 kg Al2O3, and 355.46 CuO) as expected from the heat transfer results. Moreover, the comparative study between the proposed hybrid system and passive DSSS has been carried out.
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18

Alhummiany, Haya. "Novel nanofluid based on water-loaded delafossite CuAlO2 nanowires: Structural and thermal properties." Journal of Clinical & Experimental Oncology 07 (2018). http://dx.doi.org/10.4172/2324-9110-c5-021.

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19

Tarikul, I., P. Nazma, and F. A. A. Md. "Hydromagnetic Natural Convection Heat Transfer of Copper-Water Nanofluid within a Right-Angled Triangular Cavity." International Journal of Thermofluid Science and Technology 7, no. 3 (August 18, 2020). http://dx.doi.org/10.36963/ijtst.2020070304.

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Анотація:
This investigation on free convection flow and temperature transfer within a right-angled triangular cavity loaded uniformly by Cu-H2O nanofluid including heated boundary conditions at horizontal side is performed numerically. The standing side is cooled at low heat while the hypotenuse of the triangular is insulated. The governing non-dimensional highly non-linear partial differential equations are performed by employing Galerkin weighted residual finite element method. The simulated numerical findings are exhibited using streamline contours, isotherm contours and average Nusselt number for the sampling parameters named nanoparticles volume fraction, Rayleigh number, and Hartmann number. The outcome demonstrates temperature transfer value reduces for the enhancement of Hartman number whereas improve significantly for the increase of buoyancy driven parameter Rayleigh number. Also, an excellent average temperature transfer is observed for uniform heated boundary condition (case I) compared to non-uniform thermal boundary conditions (case II & case III).
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