Heat transfer of a vertical cylinder by free convection and radiation

Sokovishin, Yu. A.; Shapiro, M. V.

doi:10.1007/bf00859014

Cited by 6 publications

(3 citation statements)

References 1 publication

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“…In this regard, Refs. [14][15][16][17] studied the boundary layer flow of a non-absorbing fluid under different circumstances. Further, several investigators also analyzed a surface which is nonreflecting, non-absorbing and ideally transparent and heat is provided to the underlying surface by absorbing fluid (water), which receives the incident rays particularly through solar radiation.…”

Section: Introductionmentioning

confidence: 99%

Solar Radiation Assisted Mixed Convection Flow Along a Vertical Plate

Siddiqa¹,

Hossain²

2014

J. mech.

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Solar radiation assisted mixed convection boundary layer flow of Newtonian fluid along a non-reflecting, non-absorbing and ideally transparent semi-infinite vertical plate is studied here. Beer's law is used to express the solar radiation term. It is convenient to transform the non-linear dimensionless parabolic partial differential equations into (i) primitive variable formulation (PVF) and (ii) stream function formulation (SFF) before applying the numerical schemes. Coupled equations thus obtained from PVF are integrated numerically through implicit finite difference method together with the Gaussian elimination technique whereas block tridiagonal Keller-box technique is adopted to simulate the system of equations obtained from SFF. Numerical results from these two methods are also compared graphically in order to test the validation of the two schemes. However, due to less computation time and accuracy numeric results of shear stress, local Nusselt number coefficient, velocity and temperature profiles are obtained via SFF. It is found that velocity as well as temperature of the non-absorbing fluid enhances owing to the increase in solar radiation parameter.

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Section: Introductionmentioning

confidence: 99%

Solar Radiation Assisted Mixed Convection Flow Along a Vertical Plate

Siddiqa¹,

Hossain²

2014

J. mech.

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“…The combined mechanism of convection-radiation problem for constant wall temperature condition differs from the constant heat flux condition in the sense that in the latter case the radiative and convective components are interdependent. The examples of such cases were discussed by Salomatov and Puzyrev (1971), Martynenko et al (1977) and Sokovishin and Shapiro (1977). The formulation of Stefan-Boltzmarm law is such that the radiative component is proportional to the difference between the fourth power of temperatures of the wall and the ambient region.…”

Section: Introductionmentioning

confidence: 99%

“…Here we investigate the effect of surface radiation on the natural convection flow in a fluid-saturated porous medium a rectangular enclosure via Darcy-Brinkman-Forchheimer model, considering an exponentially-varying surface temperature on the left vertical wall, cool right vertical and top walls. Further consideration is that the bottom wall is a diffuse gray radiator with emissivity e m ; and for the radiative component we use the Stefan-Boltzmarm law in the form given by Salomatov and Puzyrev (1971), Martynenko et al (1977) and Sokovishin and Shapiro (1977). Radiation takes place into a medium having a temperature T 0 .…”

Section: Introductionmentioning

confidence: 99%

Surface-radiation effect on natural convection flow in a fluid-saturated non-Darcy porous medium enclosed by non-isothermal walls

Hossain

Saleem²,

Gorla³

2013

International Journal of Numerical Methods for Heat &Amp; Fluid Flow

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Purpose -The purpose of this work is to study the effect of surface-radiation on the phenomenon of natural convection flow of a Newtonian fluid in a non-Darcian porous media cavity. The study is mainly focused on the interaction between the inertial resistance of the fluid layers and the surface radiation. Design/methodology/approach -For numerical simulation of transient vorticity transport and energy equations, the paper uses the alternate direct implicit method. Forward Time Central Space descretization is used for the transient and diffusion terms in the alternate direct implicit method, whereas for the convective terms, the method is modified using second upwind differencing technique. ADI method is adopted here, since this technique is unconditionally stable as a complete sweep and is second-order accurate in time for low velocity changes. The stream function equation is solved using the successive over relaxation technique with residual tolerance of order 10-5. Findings -It was found that despite the reduction of flow, the heat transfer increases as the Forschheimer resistance is increased. Further, with the increase in the Planck number, the heat transfer from the bottom radiating wall increases. Darcy drag parameter did not have a significant impact on flow properties except a slight reduction in the flow. Nevertheless, the increase in temperature ratio has a significant impact on flow properties.Research limitations/implications -The analysis is valid for unsteady, two-dimensional natural convection flow in a fluid-saturated non-Darcy porous medium enclosed by non-isothermal walls. As a first case, the study is conducted for square cavity. An extension to three-dimensional flow case and the study of Darcy-Forschheimer medium with effect of viscous dissipation is left as a part of future work. Practical implications -The approach is applicable to the modeling of geothermal systems where the inertial resistance to flow also comes into act with the non-uniform temperature distribution. The method is very useful to analyze solar receiver systems, fire research, electronic cooling, brake housing of an aircraft and many environmental geothermal processes. Originality/value -The study may be of some interest to engineers interested in heat transfer in ventilated rooms or enclosures, the industrial waste, water and atmospheric pollution.

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Transient free convection flow past an infinite vertical cylinder with thermal stratification

Deka

Paul

2012

J Mech Sci Technol

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Heat transfer of a vertical cylinder by free convection and radiation

Cited by 6 publications

References 1 publication

Solar Radiation Assisted Mixed Convection Flow Along a Vertical Plate

Solar Radiation Assisted Mixed Convection Flow Along a Vertical Plate

Surface-radiation effect on natural convection flow in a fluid-saturated non-Darcy porous medium enclosed by non-isothermal walls

Transient free convection flow past an infinite vertical cylinder with thermal stratification

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