Effect of Temperature Dependent Properties on Natural Convection of Water Near its Density Maximum in Enclosures

Sivasankaran, S.; Ho, Ching-Jenq

doi:10.1080/10407780701678356

Cited by 26 publications

(7 citation statements)

References 26 publications

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“…They found that there was thermal convection enhancement of the fluid with variable viscosity and higher Prandtl numbers and the enhancement was more distinct as the Rayleigh number increased. Sivasankaran and Ho [7] numerically explored the phenomenon of natural convection for water with temperature-dependent properties close to its maximum density in an enclosure. They disclosed that the temperature of maximum density significantly influenced flow field and heat transfer because of the production of bi-cellular configuration.…”

Section: Introductionmentioning

confidence: 99%

Effects of Temperature-Dependent Viscosity on Natural Convection in Porous Media

Chou

Lin

et al. 2015

Numerical Heat Transfer, Part A: Applications

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This analysis has studied natural convection for the temperature-dependent viscosity of fluids inside porous media between two concentric spheres by numerically solving the Brinkman-Darcy-Forchheimer model, vorticity transport, and energy equations. Parameters included Rayleigh numbers (5.0 Â 10 3 -8.0 Â 10 4 ) at radius ratios of 1.5, 2.0, and 3.5 with porosities of 0.4 and 0.9 for variable-viscosity fluids with Prandtl numbers (158, 405, and 720) when the Darcy number was changed at 0.1 and 0.001. The results showed that the mean Nusselt number varied with Rayleigh number, porosity, radius ratio, and variable viscosity but did not change with the Darcy number.

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Section: Introductionmentioning

confidence: 99%

Effects of Temperature-Dependent Viscosity on Natural Convection in Porous Media

Chou

Lin

et al. 2015

Numerical Heat Transfer, Part A: Applications

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“…They also observed the circulation of flow getting reversed when internal heat generation parameter becomes strong. Sivasankaran and Ho [27][28][29] investigated the effect of temperature-dependent properties on natural convection of water near its maximum density. They observed that the fluid flow and heat transfer rate get strongly influenced by maximum density temperature of water due to the formation of bicellular structure.…”

Section: Introductionmentioning

confidence: 99%

Magneto-convection of water near its maximum density in a cavity with partially thermally active walls

Bindhu

SundaraKrishnan

Sivasankaran

et al. 2018

Energy & Environment

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The main objective of the present numerical investigation is to understand the effect of partially active thermal zones and density inversion on the buoyancy-driven convection of cold water near its maximum density under the influence of uniform magnetic field inside a square cavity. The partially heated or cooled zones are placed along the vertical sidewalls of the cavity while the other inactive portions of the walls are considered to be adiabatic and thermally insulated. The length of the partially active thermal zones is measured to be equal to half the length of the cavity's height. When the locations of heating and cooling zones are placed in different positions, it provides a significant effect on flow pattern and the rate of heat transfer. To investigate this location effect, the thermally active zones are placed in a combination of five different relative positions along the vertical sidewalls. The modeled equations are solved using finite volume method with Semi-Implicit Method for Pressure Linked Equation algorithm. The numerical coding is done through the FORTRAN 95 programming for numerical simulation and the results attained are represented graphically in the form of flow field and temperature distribution for various values of density inversion parameter, Hartmann number, and for various positions of thermal zones. The results reveal that the heat transfer rate behaves nonlinearly on increasing the density inversion parameter values. The high transfer rate is perceived for the location middle-middle when T m < 0:5 and for top-bottom when T m ! 0:5 for all values of the Hartmann number.

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“…The natural convection of water near its density maximum in an enclosure with temperature dependent properties was numerically investigated by Sivasankaran and Ho (2008). It is found that the heat transfer rate was highly influenced by the temperature of density maximum.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on free convection of cold water in a square porous cavity heated with sinusoidal wall temperature

Janagi

Sivasankaran

Bhuvaneswari

et al. 2017

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Purpose The aim of the present study is to analyze the natural convection flow and heat transfer of cold water around °C in a square porous cavity. The horizontal walls of cavity are adiabatic, and the vertical walls are maintained at different temperatures. The right side wall is maintained at temperature θc, and the left side wall is maintained at sinusoidal temperature distribution. Design/methodology/approach The Brinkman–Forchheimer-extended Darcy model for porous medium is used to study the effects of density inversion parameter, Rayleigh number and impact of Darcy number and porosity. The finite volume method is used to solve the governing equations. Findings The heat transfer rate is increased on increasing the Darcy number and porosity. Also, the convective heat transfer rate is decreased first and then increased on increasing the density inversion parameter. Research limitations/implications The numerical computations have been carried out for the Darcy number ranging of 10(−4) ≤ Da ≤ 10(−1), the porosity ranging of 0.4 ≤ ε ≤ 0.8 and the density inversion parameter ranging of 0 ≤ Tm ≤ 1 and keeping Ra = 106. Practical implications The results can be used in the cooling of electronic components, thermal storage system and in heat exchangers. Originality/value The choice of consideration of sinusoidal heating and density maximum effect produces good result in flow field and temperature distribution. The obtained results can be used in various fields.

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Effect of Temperature Dependent Properties on Natural Convection of Water Near its Density Maximum in Enclosures

Cited by 26 publications

References 26 publications

Effects of Temperature-Dependent Viscosity on Natural Convection in Porous Media

Effects of Temperature-Dependent Viscosity on Natural Convection in Porous Media

Magneto-convection of water near its maximum density in a cavity with partially thermally active walls

Numerical study on free convection of cold water in a square porous cavity heated with sinusoidal wall temperature

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