Numerical investigation of cu-water nanofluid in a differentially heated square cavity with conducting solid square cylinder at center

Sharma, Bishwajit; Kumar, Basant; Barman, Rabindra Nath

doi:10.18280/ijht.360238

Cited by 12 publications

(6 citation statements)

References 15 publications

(17 reference statements)

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“…Two dimensional and steady continuity, momentum, and energy equations are discretized and solved with finite volume-based solver Fluent [14]. The governing equations are made non-dimensional with the length scale as the width of the cavity (L), the velocity of the lid (Uo) and the temperature difference between hot and cold lid (ΔT = Th − Tc).…”

Section: Methodsmentioning

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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Section: Methodsmentioning

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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“…Several investigations involving square cavities and enclosures of various sizes and aspect ratios have been carried out 20–37 …”

Section: Introductionmentioning

confidence: 99%

“…Several investigations involving square cavities and enclosures of various sizes and aspect ratios have been carried out. [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] Several researchers conducted a study on mixed convection inside cavities that were sinusoidal-heated, wherein Karim et al 38 conducted a numerical study of the unsteady mixed convection heat transfer properties of Ag-water nanofluids confined within a lid-driven square cavity with a sinusoidal heated bottom wall, according to the results the lower values of the parametric variation of sinusoidal even and odd frequency support enhanced heat transfer through convection and conduction.…”

Section: Introductionmentioning

confidence: 99%

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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“…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 cu-water nanofluid in a differentially heated square cavity with conducting solid square cylinder at center

Cited by 12 publications

References 15 publications

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

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

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

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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