Mixed convective of hybrid nanofluids flow in a backward-facing step

Abedalh, Ayad S.; Shaalan, Zaid A.; Yassien, Husam Naufal Saleh

doi:10.1016/j.csite.2021.100868

Cited by 15 publications

(6 citation statements)

References 23 publications

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“…Two copper tubes with different diameters are provided to carry out working material (water) from the heat source (electrical heater) to the lower reservoir positioned below the specimen. It is clear that different diameter of copper tubes means the difference in side surface area of each tube [8,20], so that; the water inside the bigger diameter tube is relatively colder than that is inside the smaller tube, this connection lines forces the water to move up through the narrow tube and fall through the other one due to the difference in densities of water inside each tube. This mechanism leads to carry heat to the upper portion or, to the second main component which called the core of the apparatus.…”

Section: Apparatusmentioning

confidence: 99%

Experimental Investigation on the Effect of Sawdust Particles Size on Its Thermal Conductivity

Yassien¹,

Mustafa²,

Soheel³

et al. 2023

IJHT

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The measurement of the thermal conductivity of the sawdust is one of the most difficult techniques due to its uniformed shape, by using this instrument, it gives the ability of measuring the thermal conductivity of the sawdust, without changing its physical properties, during the experiment, as well as, there are no necessity to use the additional materials in form of adhesive materials, that gives an identified shape of the specimen. In this study, wood sawdust is classified into three groups depending on the size of the wood pellets, namely; wo1≥1.18mm, 1.18>wo2>0.6mm and wo3≤0.6mm. To keep out the thermal properties of the sawdust as it is, no mechanical or chemical processes were carried out on sawdust specimens, such as compressing or bonding. The effect of moisture content on the thermal properties of sawdust is eliminated by drying the specimens, the procedure is carried out by heating it up to 100℃ for a 30 min. During this study, it can be seen that the thermal conductivity of all samples is inversely proportional to the working temperature. At a relatively low temperature less than 45℃, it can be said that the first model (wo1) has the lowest thermal conductivity while the differences in the thermal conductivity of the samples are insignificant when the temperature exceed 50℃, therefore; the first model (wo1) represents a good choice for flat plate solar collector insulation because it has the same activity as well as it is light and cheap.

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Section: Apparatusmentioning

confidence: 99%

Experimental Investigation on the Effect of Sawdust Particles Size on Its Thermal Conductivity

Yassien¹,

Mustafa²,

Soheel³

et al. 2023

IJHT

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“…Investigators in this field have shown that the concentration of under 1wt% and above 5wt% will not improve thermal performance. These mass fractions are described as the mass ratio of the nanoparticles to the base fluid (Abedalh, Shaalan and Saleh Yassien, 2021). The copper oxide nanoparticles specification is shown in Table 1.…”

Section: Preparation Of Nanofluidsmentioning

confidence: 99%

Thermal Performance Enhancement of Heat Pipe Heat Exchanger in the Air-Conditioning System by Using Nanofluid

Abdallah¹,

Yasin²,

Ameen³

2022

Frontiers in Heat and Mass Transfer

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To reduce the energy consumption in air-conditioning systems without changing the required temperature level in the air-conditioned space, Heat Pipe Heat Exchanger (HPHE) has been experimentally used and tested. The heat pipe has been filled with working fluid by about 50% of the volume of the evaporator which represents the filling ratio. In this research, three mass concentration of nanoparticle from copper oxide (CuO), 1wt%, 3wt% and 5wt% have been used and studied. Additionally, its effect on the HPHE effectiveness and the heat recovery ratio at different inlet air temperatures, 30, 35, 40, 45, 50, and 55 °C, have been determined in the evaporator. The study revealed that the temperature change of the evaporator and condenser has been increased with increasing the mass concentration of CuO and inlet air temperature which passing through HPHE. Furthermore, the results have been illustrated that the increasing of the inlet air temperature and CuO mass concentration leads to an increase in the effectiveness of the heat pipe. The highest level of effectiveness and maximum heat recovery value, at inlet air temperature 55 °C with inlet air velocity 1m/s have been found equal to 0.59346 and 883.284 Watt, respectively.

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“…The size, location and rotational speeds have been found as the most influencing parameters on the performance improvements [ 42 , 43 , 44 ]. The coupled effects of using nanofluid with rotational surface effects have been considered in various studies, while nanofluids have been reported to improve the thermal efficiency where the amount of enhancement depends upon the particle type and loading amount in the base fluid [ 45 , 46 , 47 , 48 , 49 , 50 ].…”

Section: Introductionmentioning

confidence: 99%

Coupled Effects of Using Magnetic Field, Rotation and Wavy Porous Layer on the Forced Convection of Hybrid Nanoliquid Flow over 3D-Backward Facing Step

et al. 2022

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In the present study, the effects of using a corrugated porous layer on the forced convection of a hybrid nanofluid flow over a 3D backward facing step are analyzed under the coupled effects of magnetic field and surface rotation. The thermal analysis is conducted for different values of the Reynolds number (Re between 100 and 500), the rotational Reynolds number (Rew between 0 and 2000), the Hartmann number (Ha between 0 and 15), the permeability of the porous layer (the Darcy number, Da between 10−5 and 10−2) and the amplitude (ax between 0.01 ap and 0.7 ap) and wave number (N between 1 and 16) of the porous layer corrugation. When rotations are activated, the average Nusselt number (Nu) and pressure coefficient values rise, while the increment of the latter is less. The increment in the average Nu is higher for the case with a higher permeability of the layer. When the corrugation amplitude and wave number are increased, favorable impacts of the average Nu are observed, but at the same time pressure coefficients are increased. Successful thermal performance estimations are made by using a neural-based modeling approach with a four input-two output system.

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Mixed convective of hybrid nanofluids flow in a backward-facing step

Cited by 15 publications

References 23 publications

Experimental Investigation on the Effect of Sawdust Particles Size on Its Thermal Conductivity

Experimental Investigation on the Effect of Sawdust Particles Size on Its Thermal Conductivity

Thermal Performance Enhancement of Heat Pipe Heat Exchanger in the Air-Conditioning System by Using Nanofluid

Coupled Effects of Using Magnetic Field, Rotation and Wavy Porous Layer on the Forced Convection of Hybrid Nanoliquid Flow over 3D-Backward Facing Step

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