1 edition of **Unsteady natural convection in cylindrical enclosures with stratified medium** found in the catalog.

- 334 Want to read
- 17 Currently reading

Published
**1985**
.

Written in English

- Transmission,
- Solar heating,
- Heat,
- Natural Convection,
- Heat storage

**Edition Notes**

Statement | by Ruey-Jong Shyu |

The Physical Object | |
---|---|

Pagination | xvi, 169 leaves : |

Number of Pages | 169 |

ID Numbers | |

Open Library | OL25925618M |

OCLC/WorldCa | 14353105 |

convection along the plate followed by an inexorable outward growth of the boundary layer. The extension of the one-dimensional convection framework to include ambient stratification is a relatively recent development []. Shapiro and Fedorovich [4] considered convection in a stratified flow adjacent to a single infinite plate. Hasan, Muhammad, Saha, Suvash, & Gu, YuanTong () Unsteady natural convection within a differentially heated enclosure of sinusoidal corrugated side walls. International Journal of Heat and Mass Transfer, 55(), pp.

[21] Kishore P. M., Rajesh V. and Verma V., “ Thermal Stratification and Viscous Dissipation Effects on MHD Unsteady Radiative Natural Convection Flow Past an Infinite Vertical Accelerated Plate Embedded in a Porous Medium with Variable Surface Temperature,” International Journal of Applied Mathematics and Mechanics, Vol. 6, No. 16, Sudhanshu Pandey, Yong Gap Park, Man Yeong Ha, Unsteady analysis of natural convection in a square enclosure filled with non-Newtonian fluid containing an internal cylinder, Numerical Heat Transfer, Part B: Fundamentals, /, (), ().

Convection at the Boundary. in. Cylindrical. Coordinates: a long cylinder (radius r = b) initially at T = f(r) whose surface temperature is made equal to zero for t > 0. A long cylinder (radius r = b) initially at T = f(r) is exposed to a cooling medium which extracts heat uniformly from its surface. Abstract: The two dimensional study of natural convection in vertical cylindrical annular enclosure filled with Cu-water nanofluid under magnetic fields is numerically analyzed. The vertical walls are maintained at different uniform hot and cold temperatures, T H and T C, respectively. The top and bottom walls of the enclosure are thermally.

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Medium and heated with a uniform lateral heat flux. The study was carried out using the forchheimer – extended Darcy flow model. Taofik [2] studied unsteady natural convection which occurs in a vertical cylindrical enclosure opened at both ends, filled with a fluid saturated porous.

The present study, therefore, was aimed at the transient 3-D numerical simulations of natural convection of air around a cylindrical containment with unsteady thermal boundary conditions (BCs) at the vessel wall.

For this purpose, the experiment series was done in the CIGMA facility at Japan Atomic Energy Agency (JAEA). Two-dimensional unsteady natural convection in enclosures of arbitrary cross section is considered.

The convection equations in the Boussinesq approximation are written in a curvilinear nonorthogonal coordinate system, in which the boundaries of the region investigated coincide with the coordinate by: 2. The aim of this study is to investigate unsteady natural convection within porous enclosure of a square.

But the main difference of this study with those simple and initial studies of for a square is using insulated block within the enclosure. This block is employed for the time reducing or increasing the amount of heat transferred thorough the Author: Ali Hooshyar Faghiri.

Natural convection heat transfer through a fluid-saturated porous media in inclined cylindrical enclosure was investigated experimentally and numerically in the present work. A numerical study is performed on natural convection inside a cylindrical enclosure filled with a volumetrically heated, saturated porous medium for the case when the vertical wall is isothermal and the horizontal walls are either adiabatic or isothermally cooled.

Buoyancy driven natural convection in an enclosure has been studied extensively. Some of the related studies are discussed below; Lemembre A. and Petit J.P [1] did studies on laminar natural convection in a laterally heated and upper cooled vertical cylindrical enclosure.

The influence of the characteristic. For validation in the case of laminar natural convection, the experimental results of Hess and Miller for a vertical cylinder were used, as will be described below. For turbulent natural convection, due to lack of standard experimental results for cylindrical enclosures, all turbulence models used in the present code were validated against the more established, for.

unsteady was determined. Ben Cheikh et al. [18] presented a benchmark solution for time-dependent natural convection flows with an accelerated full-multigrid method. Differentially heated enclosures. Patterson and Imberger [19] studied unsteady natural convection in a rectangular cavity with instantaneous.

Unsteady Natural Convection within an Attic -Shaped Space Subject to annular or cylindrical spaces etc., exposed to various thermal conditions have been However, less attention has been given to investigate natural convection in an enclosure like attic shaped under different thermal and flow conditions.

Natural convection in triangular enclosures is an important problem. It displays well the generic attributes of this class of convection, with its dependence on enclosure geometry, orientation and thermal boundary conditions. Modeling of Unsteady Natural Convection for Double-Pipe in a Partially Cooled Enclosure.

Numerical Heat Transfer, Part A: Applications: Vol. 66, No. 5, pp. The study of natural convection in triangular enclosures is important as it has applications in many domestic and industrial systems as well as in geophysical flows.

Moreover, the channels of structures, the panels of electronic apparatus and conductors in the electrical-engineering industry often have the form of a prism of triangular cross. A two-dimensional solution for unsteady natural convection in an enclosure with a square body is obtained using an accurate and efficient Chevyshev spectral collocation method.

A spectral multidomain methodology is used to handle a square body located at the center of the computational domain. Papanicolaou and V. Belessiotis, Double-diffusive natural convection in an asymmetric trapezoidal enclosure: unsteady behavior in the laminar and the turbulent-flow regime, International Journal of Heat and Mass Transfer, 48, 1, (), ().

Unsteady natural convection in a vertical cylindrical enclosure is numerically modeled in the case of heat input from above and from the side. The anisotro It is shown that in the stratified region the temperature is well described by the time-dependent one-dimensional heat conduction equation with a three-dimensional heat source.

Numerical simulations have been undertaken for the benchmark problem of natural convection flow in a square cavity. The control volume method is used to solve the conservation equations for laminar and turbulent flows for a series of Rayleigh numbers (Ra) reaching values up to 10 The k‐ϵ model has been used for turbulence modelling with and without logarithmic wall.

NATURAL CONVECTION INSIDE ENCLOSURES A considerable portion of heat loss from a typical residence occurs through the windows. We certainly would insulate the windows, if we could, in order to conserve energy.

The problem is finding an insulating material that is trans- parent. An examination of the thermal conductivities of the insulting materials. A Numerical Study of Unsteady Natural Convection in a Rectangular Enclosure – The Effect of Variable Thermodynamic and Transport Properties. A Thesis Submitted to the Graduate faculty of University of New Orleans in partial fulfillment of the requirements for the degree of Master of Science in Mechanical Engineering Thermal Fluids Science by.

The two dimensional study of natural convection in vertical cylindrical annular enclosure filled with Cu-water nanofluid under magnetic fields is numerically analyzed.

The vertical walls are maintained at different uniform hot and cold temperatures, TH and TC, respectively. The top and bottom walls of the enclosure are thermally insulated.

The governing equations are solved. Deng et al. investigated numerically the steady state natural convection induced by multiple discrete heat sources (DHSs) in horizontal enclosures. Unsteady convection numerical modelling in a vertical channel with a square cylinder was studied by Saha, Static bifurcation was found by Liu and Tao [9,10] who performed numerical computations for.the enclosures.

This paper collects and analyzes the bodies of works written about natural convection phenomenon within the enclosure to study the effects of such parameters. Key Words: Natural Convection, Thermal management, Parametric Design 1.

INTRODUCTION Natural convection in the narrow enclosures has a wide area.Natural convection heat transfer in a two-dimensional square enclosure at various angles of inclination is investigated numerically using a finite volume based computational procedure.

The heat transfer is from a constant temperature heat source of finite length centred at one of the walls to the cold wall on the opposite side while the remaining walls are insulated. The effect of area .