Effect of Suspended Particles on the Onset of Thermal Convection in a Nanofluid Layer for More Realistic Boundary Conditions

Chand, Ramesh; Rana, G. C.; Hussein, Ahmed Kadhim

doi:10.1615/interjfluidmechres.v42.i5.10

Cited by 63 publications

(22 citation statements)

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“…Furthermore, the constant n has the rang 0 1, n in which 0 n = represents the strong concentration of microelements near the sheet which are unable to rotate [10], 0.5 n = shows the vanishing of the of antisymmetric stress tensor which depicts the weak concentration, and 1 n = can be used for the turbulent flow. However, 0.5 n = which corresponds to the dilute micropolar fluid and this dilute fluid is considered in the present study.…”

Section: Governing Equationsmentioning

confidence: 99%

“…Heat source/sink effect of water-based nanofluid flow through a permeable stretching tube has been analysed by Ahmed et al [9]. Chand et al [10] investigated the Brownian diffusion and the thermophoresis effects on the horizontal layer of the nanofluid. Exact analytical solution for the heat transfer micropolar fluid flow over permeable shrinking/stretching sheets was reported by Turkyilmazoglu [11][12].…”

Section: Introductionmentioning

confidence: 99%

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Heat source/sink and Newtonian heating effects on convective micropolar fluid flow over a stretching/shrinking sheet with slip flow model

Kamran¹

2018

IJHT

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The purpose of this study is to analyse the combined effects of the heat generation(source)/ absorption (sink) and Newtonian heating on the mixed convective micropolar fluid flow past over a stretching/shrinking porous sheet. Slip flow model is also taken into account in this investigation. The governing flow behaviour is designed by coupled partial differential equations and then transformed into a system of coupled nonlinear ordinary differential equations with the mixed derivative boundary conditions. A semi-analytical approach named Homotopy Analysis Method (HAM) is applied to solve this transformed system of nonlinear equations. Influences of the pertinent dimensionless parameters on the prescribed velocities and temperature profiles along with the physical quantities are presented in the graphical and tabular illustrations. For special cases, it is found that the obtained solutions are excellent in agreement with the available results. In this study, it is observed that when the sheet stretches or shrinks, the temperature of the micropolar fluid flow increases with an increase in the heat generation and Newtonian heating parameters and it decreases with an increase in the heat absorption parameter and the Prandtl number. This investigation of the heat generation and absorption on the micropolar fluid flow with slip flow effects has shown the useful information which could be helpful for crystal growing in the industry and the processes to polish the artificial heart valves and the internal cavities.

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Section: Governing Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Heat source/sink and Newtonian heating effects on convective micropolar fluid flow over a stretching/shrinking sheet with slip flow model

Kamran¹

2018

IJHT

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“…Mohammed et al [27] perform a numerical study using different nanofluids on buoyancy-opposing laminar mixed convection. Chand et al [28] in their study of onset thermal convection on nanofluids layer investigated the suspended particles effects in detail.…”

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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Effect of Suspended Particles on the Onset of Thermal Convection in a Nanofluid Layer for More Realistic Boundary Conditions

Cited by 63 publications

References 0 publications

Heat source/sink and Newtonian heating effects on convective micropolar fluid flow over a stretching/shrinking sheet with slip flow model

Heat source/sink and Newtonian heating effects on convective micropolar fluid flow over a stretching/shrinking sheet with slip flow model

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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