Natural convection from a confined horizontal cylinder: the optimum distance between the confining walls

Sadeghipour, M.S.; Razi, Yazdan Pedram

doi:10.1016/s0017-9310(00)00110-1

Cited by 40 publications

(20 citation statements)

References 9 publications

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“…No optimal wall-spacing to cylinderdiameter ratio for maximum heat transfer was detected. On the other hand, the optimal ratio was suggested by Farouk and Guceri (1982) and Sadeghipour and Razi (2001), but without particular information about this optimal ratio. Moreover, in Konka (2000) the cylinder-diameter to wall-spacing ratio between 0.3 and 0.5 was suggested to be optimal for natural convection from the cylinder confined by two isothermal walls of different temperatures.…”

Section: Introductionmentioning

confidence: 99%

Optimum natural convection from square cylinder in vertical channel

Khodary

Bhattacharyya

2006

International Journal of Heat and Fluid Flow

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Section: Introductionmentioning

confidence: 99%

Optimum natural convection from square cylinder in vertical channel

Khodary

Bhattacharyya

2006

International Journal of Heat and Fluid Flow

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“…Although newer than scaling, the intersection of asymptotes method is now used frequently in thermal design and optimization (Sadeghipour and Razi, 2001). Optimization of global performance is an integral part of the physics of flow structures: flows choose certain patterns (shapes, structures, regimes) as compromises between the available extremes.…”

Section: Objective: Try the Simplest Firstmentioning

confidence: 99%

Simple methods for convection in porous media: scale analysis and the intersection of asymptotes

Bejan

2003

Int. J. Energy Res.

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SUMMARYThis article outlines the basic rules and promise of two of the simplest methods for solving problems of convection in porous media. First, scale analysis is the method that produces order-of-magnitude results and trends (scaling laws) for concrete and applicable results such as heat transfer rates, flow rates, and time intervals. Scale analysis also reveals the correct dimensionless form in which to present more exact results produced by more complicated methods. Second, the intersection of asymptotes method identifies the correct flow configuration (e.g. B! e enard convection in a porous medium) by intersecting the two extremes in which the flow may exist: the many cells limit, and the few plumes limit. Every important feature of the flow and its transport characteristics is found at the intersection, i.e. at the point where the two extremes compete and find themselves in balance. The intersection is also the flow configuration that minimizes the global resistance to heat transfer through the system. This is an example of the constructal principle of deducing flow patterns by optimizing the flow geometry for minimal global resistance. The article stresses the importance of trying the simplest method first, and the researcher's freedom to choose the appropriate problem solving method. Copyright The objective of this paper is to emphasize the freedom that educators and researchers have in choosing methods to solve problems, present the results, and put them in practice. The field of convection in porous media is an excellent candidate for stressing this important message. It is mature enough, and at the same time it is rich: its results cover a wide spectrum of problems and applications in thermal engineering, physics, geophysics, bioengineering, civil engineering, and many other fields. These fields are united by several key phenomena, some of which are selected for analysis in this paper. The opportunity that the maturity of our field offers is this: after a few decades of development, we find that more than one method is available for attacking a certain type of problem. The papers collected in the present volume illustrate this aspect very well. Older

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“…Indeed, in many technological applications, the fluid medium around the cylinder is partially or completely confined, which may imply dramatic changes in the amount of heat and momentum transferred. Nonetheless, published works readily available in the open literature are relatively few, and mainly deal with the horizontal confinement [15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%