Effect of thick horizontal partial partition attached to one of the active walls of a differentially heated square cavity
01 May 1994-Numerical Heat Transfer Part A-applications (Taylor & Francis Group)-Vol. 25, Iss: 5, pp 611-625
TL;DR: In this paper, the effect of a partial horizontal partition plate of finite thickness attached to the heated vertical wall of a differentially heated square cavity has been studied numerically using the finite element method.
Abstract: The effect of a partial horizontal partition plate of finite thickness, attached to the heated vertical wall of a differentially heated square cavity, has been studied numerically using the finite element method. The partition thickness is varied from 0.5% of the height of the cavity to 10%. The partition is considered to be located at the middle of the hot wall of a width equivalent to 20% of the cavity width. It is observed that as the partition thickness is reduced, heat transfer across the cavity decreases at first, until a critical thickness of the partition plate is reached. Beyond this value, heat transfer increases as the thickness of the partition is further reduced. Streamline maps are found to be notably sensitive to the partition thickness. The effect of conductivity of the partition material on heat transfer is also studied. Except for material with poor thermal properties, conductivity of the partition is observed to have a negligible effect on heat transfer.
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TL;DR: In this article, the effects of partitioning in solar stills on performance recovery are investigated experimentally and numerically, and a cost analysis is performed to investigate the modified still, economically.
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Cites background from "Effect of thick horizontal partial ..."
...Nag et al. (1994) investigated the effects of a partial horizontal partition on the heat transfer in a square cavity....
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TL;DR: In this paper, the heat transfer and fluid flow in a rectangular enclosure fitted with a vertical adiabatic partition is investigated experimentally, where the partition is oriented parallel to the two vertical isothermal walls, one of which is heated and the other cooled while all other surfaces of the enclosure are insulated.
85 citations
TL;DR: In this paper, the effect of vertical partitioning on convection in air-filled rectangular enclosures was studied and it was found that placing a partition midway between the vertical walls of an enclosure produces the greatest reduction in heat transfer and often compares favorably with fully insulating the enclosure with a porous material.
70 citations
TL;DR: In this paper, the authors investigated the thermal conditions along the partition are not known beforehand; rather, they are an outcome of the coupling of the natural convection systems on either side of the enclosure partition.
Abstract: Natural convection in an inclined enclosure with a centrally located, complete partition has been investigated by a finite-difference procedure. The thermal conditions along the partition are not known beforehand; rather, they are an outcome of the coupling of the natural convection systems on either side of the enclosure partition. To resolve this coupling, a consecutive calculation procedure is used in which the natural convection on either side of the enclosure is successively solved (until convergence) with information exchange in each cycle of solution. Results have been obtained for enclosures with overall aspect ratios of 1 and 2 for Rayleigh numbers up to 107 and for inclination angles of 30, 45, 60, and 90 degrees. Results indicate that the strength of the convective motion and the average Nusselt number are both considerably reduced owing to the presence of the partition. The partition temperature increases monotonically along its length. For a vertical enclosure, the non-uniformity in the parti...
44 citations
TL;DR: In this paper, finite element predictions of two-dimensional laminar natural convection in a partially divided rectangular cavity at high Rayleigh number were presented, where the walls are differentially heated, the horizontal surfaces are insulated and the cavity contains a partial vertical divider which is centrally located and whose height is varied.
Abstract: Finite element predictions of two-dimensional laminar natural convection in a partially divided rectangular cavity at high Rayleigh number are presented. The walls are differentially heated, the horizontal surfaces are insulated and the cavity contains a partial vertical divider which is centrally located and whose height is varied. Detailed results are presented for an aluminium half-divider in water for Rayleigh number up to 1011 and compared directly with recent experiments in a cavity of aspect ratio 1/2. The predicted flow and heat transfer are in good agreement with the measurements and confirm the existence of a high Rayleigh number regime with characteristic behaviour that differs significantly from that found at lower Rayleigh number. In addition, the effects of the divider height, the divider conductivity, the fluid Prandtl number and the cavity aspect ratio are studied. The results show that a direct simulation of the complex flow and heat transfer that occurs in partially divided cavities is possible for realistic physical conditions.
20 citations
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16 citations