On the Onsetof Thermal Instability in a Low Prandtl Number Nanofluid Layer in a Porous Medium

Chand, Ramesh; Rana, G. C.

doi:10.18869/acadpub.jafm.67.221.22830

Cited by 86 publications

(24 citation statements)

References 23 publications

(16 reference statements)

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“…Substituting trail functions (24) in the system of equations (19) - (21) and using boundary condition (22), we obtain the eigenvalue equation for stationary convection (n = 0), as: (25) Ra = a 2 + 10 2 + C a 2 + 10 a 4 + 20a 2 + 120…”

Section: Linear Stability Analysismentioning

confidence: 99%

“…Using that model, Nield and Kuznetsov [15][16][17], Kuznetsov and Nield [18][19][20], Yadav et al [21][22], Chand et al [23,24], Chand and Rana [25][26][27][28], Chand [29], Umavathi and Mohite [30] and Rana et al [31] studied the problems related to thermal instability in nanofluids. In all the above studies it was assumed that nanoparticle concentration can be imposed at the boundaries of the fluid.…”

Section: Introductionmentioning

confidence: 99%

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Thermal Instability in a Layer of Couple Stress Nanofluid Saturated Porous Medium

Chand¹,

Rana²,

Yadav³

2017

Journal of Theoretical and Applied Mechanics

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Thermal instability in a horizontal layer of Couple-stress nanofluid in a porous medium is investigated. Darcy model is used for porous medium. The model used for nanofluid incorporates the effect of Brownian diffusion and thermophoresis. The flux of volume fraction of nanoparticle is taken to be zero on the isothermal boundaries. Normal mode analysis and perturbation method is employed to solve the eigenvalue problem with the Rayleigh number as eigenvalue. Oscillatory convection cannot occur for the problem. The effects of Couple-stress parameter, Lewis number, modified diffusivity ratio, concentration Rayleigh number and porosity on stationary convection are shown both analytically and graphically.

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Section: Linear Stability Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal Instability in a Layer of Couple Stress Nanofluid Saturated Porous Medium

Chand¹,

Rana²,

Yadav³

2017

Journal of Theoretical and Applied Mechanics

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“…Chand et al [23] investigated thermal instability of nanofluids in a porous medium using Galerkin weighted residuals method. Ahmed et al [24] in their study of stretching tube in heat sink using nanofluids investigated the effects of thermal conductivity and dynamic viscosity on heat transfer and boundary-layer flow.…”

Section: Introductionmentioning

confidence: 99%

Numerical study for heat transfer enhancement using CuO water nanofluids through mini-channel heat sinks for microprocessor cooling

et al. 2020

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Original scientific paper https://doi.org/10.2298/TSCI180722022AWater cooled heat sinks are becoming popular due to increased heat generation inside the microprocessor. Timely heat removal from microprocessor is the key factor for better performance and long life. Heat transfer enhancement is reached either by increasing the surface area density and/or by altering the base fluid properties. Nanoparticles emerge as a strong candidate to increase the thermal conductivity of base fluids. In this research, the thermal performance of mini-channel heat sinks for different fin spacing (0.2 mm, 0.5 mm, 1 mm, and 1.5 mm) was investigated numerically using CuO-water nanofluids with volumetric concentration of 1.5%. The numerical values computed were than compared with the literature and a close agreement is achieved. We recorded the minimum base temperature of chip to be 36.8 °C for 0.2 mm fin spacing heat sink. A reduction of 9.1% in base temperature was noticed using CuO-water nanofluids for 0.2 mm fin spacing as compared to previously experimental estimated value using water [1]. The drop percentage difference in pressure between water and CuO-water nanofluids was 2.2-13.1% for various fin spacing heat sinks. The percentage difference in thermal resistance between water and CuO-water nanofluids was computed 12.1% at maximum flow rate. We also observed uniform temperature distribution for all heat sinks.

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“…The photocatalytic activity is also improved by band gap engineering, as a result of the quantum confinement effect [11][12][13]. There are number of research articles published on applications of nanomaterials in renewable energy and in enhancing the performance of the direct absorption solar collectors [14][15][16][17][18][19][20][21][22]. A well-controlled synthesis process at room temperature is needed for the economical use of ZnO in applications such as water treatment and other environmental applications.…”

Section: Introductionmentioning

confidence: 99%

Room Temperature Synthesis of Monodisperse ZnO Nanoparticles Using Ultrasonically Atomized Precursor Mist in Simple Chemical Route

2019

IJNN

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Monodisperse zinc oxide (ZnO) nanoparticles were synthesized using ultrasonically atomized precursor mist in simple chemical route at low temperature. Analytical grade sodium hydroxide and zinc chloride were dissolved in 100 ml methanol. Zinc chloride precursor solution was converted into very fine mist (atomized) using a nozzle (Sono-Tek Corporation, U.S.A.) operated at ultrasonic frequency of 120 KHz. Fine mist droplets were added slowly (50ml/ hour) into sodium hydroxide solution in 2 hours. The NaOH solution in beaker turned slowly into white product due to addition of zinc chloride. The white product was kept in constant temperature bath at 90°C for 3 hours. The white product was washed five times using double distill water and dried in oven for 2 hours. Different powder samples were synthesized using same procedure by changing the molarity of sodium hydroxide keeping the molarity of zinc chloride and other preparative conditions same. The structural, microstructural, thermal and optical properties of fine powders were analyzed using X Ray Diffractometer, Scanning Electron Microscopy, Simultaneous Thermal Analyzer, UV-Vis Spectroscopy and Photoluminescence Spectroscopy. Fine ZnO nanorods, elongated and spherical nanoparticles were observed due to change in molarity of NaOH. The results are discussed and interpreted.

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On the Onsetof Thermal Instability in a Low Prandtl Number Nanofluid Layer in a Porous Medium

Cited by 86 publications

References 23 publications

Thermal Instability in a Layer of Couple Stress Nanofluid Saturated Porous Medium

Thermal Instability in a Layer of Couple Stress Nanofluid Saturated Porous Medium

Numerical study for heat transfer enhancement using CuO water nanofluids through mini-channel heat sinks for microprocessor cooling

Room Temperature Synthesis of Monodisperse ZnO Nanoparticles Using Ultrasonically Atomized Precursor Mist in Simple Chemical Route

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