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Published **1996**
by UMIST in Manchester .

Written in English

**Edition Notes**

Statement | I.H. Bokhari ; supervised by P.L. Betts. |

Contributions | Betts, P. L., Mechanical Engineering (T.F.M.). |

ID Numbers | |
---|---|

Open Library | OL21238724M |

Experiments have been undertaken to investigate the natural convection of air in a tall differentially heated rectangular cavity ( m high by m wide by m in depth). They were performed with temperature differentials between the vertical plates of °C and °C, giving Rayleigh numbers based on the width of ×10 6 and 1 Cited by: Experiments have been undertaken to investigate the natural convection of air in a tall differentially heated rectangular cavity (m high by m wide . turbulent natural convection air-filled-rectangular tall cavity: m (corresponding to the width W, height H, and depth D, respectively), where the ratio between the height and the width corresponds to the large aspect ratio: Ar = H/W = The naturalCited by: 5. (a) 2D rectangular cavity, (b) 2D square cavity and (c) 3D tall cavity In the study of [2] the aspect ratio of height and width was with a ºC temperature.

(). EXPERIMENTAL STUDY OF TURBULENT NATURAL CONVECTION IN A TALL AIR CAVITY. Experimental Heat Transfer: Vol. 9, No. 2, pp. This article describes an experimental study of turbulent natural convection in an air cavity with an aspect ratio of The study provides data for the velocities and temperatures at a Rayleigh number based on cavity width of × 10 6, which is useful in validating computational and theoretical results.A laser Doppler anemometer was used for velocity measurements, while fine. Figures 1 shows the closed 2D cavity from [2] where only natural convection was considered (F ig 1a), the closed 2D cavity from [5] and the open-ended 3D cavity from [6] where both natural convection and radiation were considered (F igs 1b & 1c). Figure 1. (a) 2D rectangular cavity, (b) 2 D square cavity and (c) 3D tall cavity. TURBULENT NATURAL CONVECTION IN AN ENCLOSED CAVITY FILLED WITH SOLID OBSTACLES In the case of a rectangular cavity of height H, the natural convection heat transfer from hot to cold wall is characterised by the formation of a slow moving vortex. This vertical motion is often interpreted as an ‘engine’ which found in several text.

of medium in the analysis of the natural convection[15{18]. The experimental works of Tsuji and Nagano [19] for a heated vertical plate, by Betts and Bokhari [1] for a tall cavity, by King [20] and Cheeswright et al. [21] for a rectangular cavity, by Tian and Karayiannis [22] and Ampofo. In this paper a numerical study of a turbulent, natural convection problem is performed with a compressible Large-Eddy simulation. In a natural convection the fluid is accelerated by local density differences and a resulting pressure gradient. Directly at the heated walls the temperature distribution is determinate by increasing temperature gradients. The present numerical work explores the fluid flow and heat transfer characteristics due to combined forced and natural convection in a tall lid-driven cavity containing uniformly heated equilateral triangular block. The flow is assumed to be steady, laminar, and two dimensional with incompressible non-Newtonian power-law fluids. The study is carried out to illustrate the convection . putational study of turbulent natural convection in a square cavity for air and water. The calculations have been done for Rayleigh number up to 10 14 for air and 10 15 for water. Three different turbulence models have been applied that include the standard k −ǫ model (in-conjunction with wall function), low-Reynolds number k −ǫ models pro-.

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