A numerical study on the effect of a heated hollow cylinder on mixed convection in a ventilated cavity

Mamun, Md. Abdullah Al; Rahman, Md. Mustafizur; Billah, M.M.; Saidur, R.

doi:10.1016/j.icheatmasstransfer.2010.07.019

Cited by 65 publications

(18 citation statements)

References 16 publications

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“…Their results indicated that the magnetic field strongly affected the flow phenomenon and temperature field inside the cavity, whereas this effect is less significant in the channel. Moreover, Mamun et al [25] performed a numerical study on the effect of a heated hollow cylinder on mixed convection in a ventilated cavity. Their findings were that the cylinder diameter has a significant effect on both the flow and thermal fields but the solid–fluid thermal conductivity ratio has a significant effect only on the thermal field.…”

Section: Introductionmentioning

confidence: 99%

Simulation of mixed convection heat transfer in a horizontal channel with an open cavity containing a heated hollow cylinder

Rahman

Parvin

Rahim

et al. 2012

Heat Trans. Asian Res.

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The objective of this paper is to numerically investigate the mixed convective flow and heat transfer controlled by a heated hollow cylinder inside an open cavity attached with a horizontal channel. All the boundaries of the channel and cavity are perfectly insulated while the inner surface of the cylinder is heated uniformly by heat flux q. The equations of conservation of mass, momentum, and energy were solved using adequate boundary conditions by Galarkin's weighted residual finite element technique. The solution has been performed in the computational domain as a whole with proper treatment at the solid/fluid interface. Computations have been conducted for Ra = 103–105, Prandtl number Pr varying from 0.7 to 7 and ratio of solid to fluid thermal conductivities from 0.2 to 50. Results are presented in terms of streamlines, isotherms, heat transfer rate in terms of the average Nusselt number (Nuav), drag force (D), and maximum bulk temperature (θmax). © 2012 Wiley Periodicals, Inc. Heat Trans Asian Res; Published online in Wiley Online Library (http://wileyonlinelibrary.com/journal/htj). DOI 10.1002/htj.21002

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Section: Introductionmentioning

confidence: 99%

Simulation of mixed convection heat transfer in a horizontal channel with an open cavity containing a heated hollow cylinder

Rahman

Parvin

Rahim

et al. 2012

Heat Trans. Asian Res.

Self Cite

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“…The changes in obstacle size or shape can lead to Nusselt number increases as high as 40% (Jubran et al, 1996) and mass transfer enhancements up to two times (Sparrow et al 1982(Sparrow et al , 1984. Heat transfer and airflow by mixed convection around a hollow cylinder placed in a ventilated cavity was studied by Mamun et al (2010). A wide range of pertinent parameters such as Rayleigh number (0-105), Richardson number (0.0-5.0), dimensionless cylinder diameter (0.2-0.5) and the solid-fluid thermal conductivity ratio (0.2-10.0) are considered for Reynolds number = 100.…”

Section: Airflow and Heat Transfer Between Object And Airmentioning

confidence: 99%

Experimental study of airflow and heat transfer above a hot liquid surface simulating a cup of drink

Laguerre¹,

Osswald²,

Hoang³

et al. 2017

Journal of Food Engineering

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This work was carried out to study the airflow and heat transfer above a cup of hot drink. The experiment was undertaken in a device in which the air temperature and velocity were controlled representing a room condition. The influence of heat exchange by convection and evaporation between the hot drink (at different temperatures) and air on the velocity and temperature fields above the cup is presented. An experimental methodology was developed to evaluate the heat transfer coefficient between the air and hot drink with and without evaporation. The airflow visualisation by PIV (Particle Imagery Velocimetry) above the cup shows that the flow is complex with unsteady plumes detachment and vortex formation. The combined convection and evaporation lead to upward airflow with temperature fluctuations which become significant for drink temperature above 55°C. This can be explained by the non

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“…They concluded that by increasing the solid volume fraction the heat transfer rate is enhanced at different Richardson numbers and outlet port positions. The heat transfer by mixed convection inside a vented cavity with an internal heated cylinder was studied numerically by Mamun et al, (2010). They founed that the size of the cylinder and the solid-fluid thermal conductivity has significant effect on thermal field.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer and Cu-Water Nanofluid Flow in a Ventilated Cavity Having Central Cooling Cylinder and Heated From the Below Considering Three Different Outlet Port Locations

Boulahia¹,

Wakif²,

Sehaqui³

2018

Frontiers in Heat and Mass Transfer

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A numerical study has been performed to investigate mixed convection flow in a vented square cavity with circular cooling obstacle. The governing equations such as two dimensional Navier-Stokes, continuity, and energy balance equations have been solved using a finite volume discretization method with SIMPLE algorithm. The effect of the Richardson number, outlet port location and volume fraction of nanoparticles were studied. The outlet port is varied from top to bottom in order to find the maximum heat transfer rate. The results indicated that by increasing the volume fraction of nanoparticles and reducing Richardson number, the heat transfer rate is enhanced. Moreover, it is found that the best configuration of the system for better heat transfer is obtained when placing the outlet port on the bottom location of the vented cavity.

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A numerical study on the effect of a heated hollow cylinder on mixed convection in a ventilated cavity

Cited by 65 publications

References 16 publications

Simulation of mixed convection heat transfer in a horizontal channel with an open cavity containing a heated hollow cylinder

Simulation of mixed convection heat transfer in a horizontal channel with an open cavity containing a heated hollow cylinder

Experimental study of airflow and heat transfer above a hot liquid surface simulating a cup of drink

Heat Transfer and Cu-Water Nanofluid Flow in a Ventilated Cavity Having Central Cooling Cylinder and Heated From the Below Considering Three Different Outlet Port Locations

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