Numerical Investigation of Ag-H2O Nanofluid in a Lid Driven Square Cavity with Different Shaped Conducting and Insulating Cylinders Placed at Centre

Bora, Mayur Krishna; Alam, Md. Mahbubul; Sharma, Bishwajit; Barman, Rabindra Nath

doi:10.18280/ijht.370320

Cited by 6 publications

(9 citation statements)

References 13 publications

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“…Furthermore, the currently adopted numerical model of mixed convection is tested using a base fluid for different Rayleigh numbers in a square cavity and compared with the results of Talebi et al 53 and Bora et al 54 and a good agreement is registered as portrayed in Figure 3. Besides, the velocity and temperature inside the square cavity were further compared with the results of the Cheng 55 study where Re = 1500, and Gr = 2.25 × 10 6 in top cooled moving wall and bottom heated square cavity as shown in Figure 4A,B.…”

Section: Numerical Approachmentioning

confidence: 76%

A numerical investigation of the effect of sinusoidal temperature on mixed convection flow in a cavity filled with a nanofluid with moving vertical walls

et al. 2022

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The aim of this study is to investigate numerically the effect of sinusoidal temperature on mixed convection flow in a cavity filled with nanofluid and moving vertical walls by using a new temperature function, where thermal heating takes the form of the sinusoidal temperature; and could be found in various natural processes and industries such as solar energy, and cooling of electronic components. The heating is concentrated in the center and then distributed to both ends at different values of Rayleigh numbers, Reynolds numbers, and volumetric fractions of nanoparticles ranging from 1.47 × 103 to 1.47 × 106, 1 to 100, and 0 to 0.1, respectively. The impact of nanoparticle size on thermal characteristics and hydrodynamics was considered and evaluated. From the results, the volume fraction concentration of nanoparticles affects the flow shape and thermal performance in the case of a constant Reynolds number. Moreover, the effect of nanoparticles decreases with the increase of the Reynolds number. Besides this, with increasing the volume percentage of nanoparticles, the rate of heat transmission increases. It is worth noting that the presence of nanoparticles results in height convective heat transfer coefficient. On the other hand, the thickness of thermal boundary layers decreases with increasing Rayleigh number. The current investigation found that the (sinusoidal) temperature change significantly affects heat transfer.

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Section: Numerical Approachmentioning

confidence: 76%

A numerical investigation of the effect of sinusoidal temperature on mixed convection flow in a cavity filled with a nanofluid with moving vertical walls

et al. 2022

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“…They mentioned that the location of the heater is a very important parameter in the heat transfer in a confined cavity. Bora et. al.…”

Section: Introductionmentioning

confidence: 99%

“…al. (2019) [2] observed the thermal performance of silver nanofluid by efficient thermal mixing incorporating the cylinder inside the cavity. Daungthongsuk et al (2007) [3] explained the reason for enhancement in heat transfer by suspending nanoparticles to base fluid.…”

Section: Introductionmentioning

confidence: 99%

Mixed Convection Inside a Cavity Incorporating Cu-H2O Nanofluid with Conducting Cylinders Placed at Optimum Position

Sharma¹,

Bora²,

Alam³

et al. 2021

J. Nano- Electron. Phys.

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A computational study of laminar and steady heat transfer is carried out with copper (Cu)-water nanofluid inside a lid driven cavity. Different conducting obstacles are placed at the optimum position for which the maximum thermal transport occurs. The thermal performance of the Cu-H2O nanofluid is found out at this optimum position with three different cylinder geometries (square, rectangular and circular), two Richardson numbers (0.01 and 1), and three volume concentrations of copper nanoparticles (0 %, 3 % and 5 %) in water. The Prandtl and Grashof numbers are considered as 6.2 and 10 4 , respectively. The fluid is heated by placing a differential heater at the left wall. All the walls except the upper one are in a stationary condition. The top moving wall, stationary bottom wall and the remaining portion of the left wall, where there is no heater, are made insulated. The rectangular cylinder is placed at two different orientations (vertical and horizontal). The results show that the shape of the cylinder contributes to a compelling role in efficient heat transfer. For both Richardson numbers, the Nusselt number is maximum with the case where the square-shaped cylinder is placed at the top left corner. The Nusselt number increases with an increase in the percentage volume of nanoparticles and reduces with an increase in the Richardson number.

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“…In the literature, some investigation of the mixed convection in vented cavities were reported using different inlet and outlet ports location [17][18][19][20], uniform and non-uniform heated wall [21][22][23][24], adiabatic ,isothermal or heated solid block with different shape, size location and [25][26][27][28][29][30][31][32][33]. Gupta et al [34] studied a mixed convection in a ventilated cavity for different thermal conditions of the cavity walls with heated conducting cylinder at the size of D (0.1-0.5) and conductivity K (0.1-10).Considering two cases of heated walls.…”

Section: Introductionmentioning

confidence: 99%

Optimal Conditions of Natural and Mixed Convection in a Vented Rectangular Cavity with a Sinusoidal Heated Wall Inside with a Heated Solid Block

et al. 2021

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The present investigation deals with the natural, mixed and forced convection in a vented rectangular cavity having a sinusoidal heated vertical wall with a conducting solid block placed at one of the nine positions. The objective is to analyze numerically using finite element method the effects of the following parameters: inlet, outlet positions, solid square positions, thermal coefficient λ, amplitude ratio ɛ, phase deviation ϕ and the solid square size on the thermo-convective flows. The Richardson number is varied from 0 to 40, the Reynolds and Prandtl numbers are fixed respectively at 100 and 0.71. To quantify the heat transfer of the solid block and to get closer to real conditions, we have developed a modification based on the evaluation of the Nusselt number using the average temperature in the cavity, unlike previous works which used the input temperature. As results, the sinusoidal temperature at the right wall gives higher heat transfer enhancement. The variation of the phase deviation and amplitude ratio have a slightly effect on the average fluid temperature and average Nusselt at the right wall and at the square solid.

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Numerical Investigation of Ag-H2O Nanofluid in a Lid Driven Square Cavity with Different Shaped Conducting and Insulating Cylinders Placed at Centre

Cited by 6 publications

References 13 publications

A numerical investigation of the effect of sinusoidal temperature on mixed convection flow in a cavity filled with a nanofluid with moving vertical walls

A numerical investigation of the effect of sinusoidal temperature on mixed convection flow in a cavity filled with a nanofluid with moving vertical walls

Mixed Convection Inside a Cavity Incorporating Cu-H2O Nanofluid with Conducting Cylinders Placed at Optimum Position

Optimal Conditions of Natural and Mixed Convection in a Vented Rectangular Cavity with a Sinusoidal Heated Wall Inside with a Heated Solid Block

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