Mixed convection heat transfer in a differentially heated square enclosure with a conductive rotating circular cylinder at different vertical locations

Hussain, Salam Hadi; Hussein, Ahmed Kadhim

doi:10.1016/j.icheatmasstransfer.2010.12.006

Cited by 140 publications

(46 citation statements)

References 28 publications

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“…Boundary-layer development, flow separation, and secondary flows that occur in these complex flows give rise to significant modification of heat and mass transport, as reported by various experimental groups see [8,9]. Heat transfer and fluid flow characteristics over a backward facing [10,11] and forward facing [12] step in a channel with the insertion of rotating obstacles has received some attention in the literature [13,14].…”

Section: Introductionmentioning

confidence: 97%

Control of Laminar Fluid Flow and Heat Transfer in a Planar T-Channel with Rotating Obstacle

Jothiappan¹

2015

J Phys Math

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Section: Introductionmentioning

confidence: 97%

Control of Laminar Fluid Flow and Heat Transfer in a Planar T-Channel with Rotating Obstacle

Jothiappan¹

2015

J Phys Math

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“…Nasrin [13] carried out a aspect ratio effect of vertical lid-driven chamber having a centered conducting solid on mixed magneto convection. Hussain et al [14] studied the problem of mixed convection heat transfer in a differentially heated square enclosure with a conductive rotating circular cylinder at different vertical locations. Sivasankaran et al [15] considered the numerical study on mixed convection in an inclined lid-driven cavity with discrete heating.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study of Mixed Convection in Square Lid-Driven with Internal Elliptic Body and Constant Flux Heat Source on the Bottom Wall

et al. 2017

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The mixed convection in square lid-driven with internal elliptic body and constant flux heat source on the bottom wall is numerically simulated in this paper following a finite element method approach. The left moving wall and right moving wall are cold. The upper wall is insulated and so is the lower wall with heat flux located in the middle. The magnetic field of strength B is applied parallel to x-axis. Result is presented for different Richardson numbers (0.01 ≤ Ri ≤ 10) when Grashof numbers are (10 ≤ Gr ≤ 50) and Prandtl number is taken as Pr = 0.733 for all computations. The influence of the Richardson number on heat source surface is being investigated in this paper. Results are presented in the form of streamline and isotherm plots as well as the variation of the maximum temperature and Nusselt number at the heat source surface under different conditions. A detailed analysis of flow pattern shows that the mixed convection is based on the parameters Richardson number (Ri), Grashof number (Gr) and Reynolds number (Re).

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“…Costa and Raimundo [5] observed the effect of inserting an active cylinder insider a differentially heated square enclosure on mixed convection. Salam et al [6] also focused mixed convection in a square enclosure with an active rotating cylinder. Bae et al [7] investigated mixed convection in a channel having porous multi-blocks under imposed thermal flow modulation and found that heat transfer rate at the most upstream heater is enhanced by the presence of porous block.…”

Section: Introductionmentioning

confidence: 99%

A Computational Study on Mixed Convection Heat Transfer in an Inclined Rectangular Channel under Imposed Local Flow Modulation

et al. 2017

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Numerical investigation of mixed convection heat transfer in an inclined 2D rectangular channel provided with partially heated bottom wall and a constant low temperature upper wall has been performed. The heated section of the bottom wall i.e. the heaters are maintained with constant heat flux and separated from each other by adiabatic segments. A fully developed parabolic velocity profile at constant low temperature is induced at the inlet. To enhance the heat transfer from the heaters, local flow field in the channel is modulated by placing circular cylinders rotating in counterclockwise direction (aiding flow) above each heater along the channel centerline. The fluid and the thermal fields within the rectangular channel are governed by the two-dimensional Navier-Stokes and Energy equations that have been solved by adapting Galerkin finite element method. The governing parameters of the present problem such as Reynolds number (Re) and Grashof number (Gr) are varied in the range of 1 ≤ Re ≤ 100 and 10 3 ≤ Gr ≤ 10 5. Air has been considered as working fluid having a Prandtl number, Pr = 0.71. In addition to these governing parameters, the inclination angle of the channel (α) and the speed ratio (ξ) that is the ratio of peripheral speed of the rotating cylinder and the maximum inlet flow velocity is also varied in the range of 0° ≤ α ≤ 90° and 0.5 ≤ ξ ≤ 2.0 respectively. The thermal and the fluid fields are visualized via the isotherm and the streamline plots. The efficacy of local flow modulation with rotating cylinder for heat transfer enhancement has been estimated in terms of normalized average Nusselt number over the heaters as Nu/Nu nc , where Nu and Nu nc represents the average Nusselt number with and without flow modulation respectively. Results obtain in the present study reveals that, for very weak flow (Re = 1), flow modulation results in lower heat transfer particularly at lower values of Gr on the contrary for moderate and higher values of Re (10, 100), flow modulation has been found to result in higher heat transfer particularly at lower values of Gr. For example, at Re = 100 and α= 0°, about 32% to 55% enhancement in heat transfer has been obtained for 10 3 ≤ Gr ≤ 10 5 . Variation in heat transfer enhancement through flow modulation has also been noticed for different channel inclination angle (α) for various system configurations.

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Mixed convection heat transfer in a differentially heated square enclosure with a conductive rotating circular cylinder at different vertical locations

Cited by 140 publications

References 28 publications

Control of Laminar Fluid Flow and Heat Transfer in a Planar T-Channel with Rotating Obstacle

Control of Laminar Fluid Flow and Heat Transfer in a Planar T-Channel with Rotating Obstacle

A Numerical Study of Mixed Convection in Square Lid-Driven with Internal Elliptic Body and Constant Flux Heat Source on the Bottom Wall

A Computational Study on Mixed Convection Heat Transfer in an Inclined Rectangular Channel under Imposed Local Flow Modulation

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