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Wednesday, May 6, 2020 | History

2 edition of Natural convective flows in horizontal cylindrical annuli found in the catalog.

Natural convective flows in horizontal cylindrical annuli

Ralph E. Powe

# Natural convective flows in horizontal cylindrical annuli

## by Ralph E. Powe

Published by Engineering and Industrial Research Station, Mississippi State University in State College .
Written in English

Subjects:
• Heat -- Convection.

• Edition Notes

Bibliography: leaves [139]-141.

Classifications The Physical Object Statement by Ralph E. Powe and C. T. Carley. Contributions Carley, Charles Team, joint author. LC Classifications QC327 .P68 Pagination xi, 141 l. Number of Pages 141 Open Library OL5637189M LC Control Number 68064987

T. H. Kuehn and R. J. Goldstein, “An experimental study of natural convection heat transfer in concentric and eccentric horizontal cylindrical annuli,” ASME Journal of Heat Transfer, Vol. , pp. –, has been cited by the following article. method was also applied by Kuehn and Goldstein [1, 10] and Cho et al. [11] natural convection heat transfer in horizontal cylindrical annuli. Zhao and Zhang [12] proposed an unstructured-grid upwind finite-volume method and validate their method by simulating natural convection flows in eccentric by: 3.

Natural convection in a horizontal cylindrical annulus filled with a porous medium saturated by a nanofluid using Tiwari and Das’ nanofluid model. / Sheremet, M. A.; Pop, Ioan. In: European Physical Journal Plus, Vol. , No. 6, , Research output: Contribution to journal › Article. There are several articles on natural convection within annuli of varying shape boundary. Sambamurthy et al. [8] performed a numerical study of two-dimensional conjugate natural convection in a horizontal cylindrical annulus between an inner heat-generating solid square element and an outer isothermal circular boundary.

Natural convection flow of Cu-Water nanofluid in horizontal cylindrical annuli with inner triangular cylinder using Lattice Boltzmann method International Communications in Heat and Mass Transfer 44 () – , Numerical Simulation of micro particles in a concentric annulus by lattice Boltzmann methodTitle: PhD from Peking University. Natural convection in horizontal annuli: a lower bound for the energy Fig. 1 2d-sketch of the domain in Cartesian and polar coordinates. The ﬂuid moves in the shaded region under the combined effects of gravity g and of the temperature difference Ti −To >0 between the surfaces x z r R o R g ϕ T i i T o measure of either the inner or the.

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### Natural convective flows in horizontal cylindrical annuli by Ralph E. Powe Download PDF EPUB FB2

Magnetic field effects on natural convection flow of a nanofluid in a horizontal cylindrical annulus using Lattice Boltzmann method. International Journal of Cited by: natural convection in annuli with fins on the inner cylinders, [].

The presence of internal fins alters the flow patterns and temperature distributions that consequently affects heat. INTRODUCTION A RECENT investigation of natural convective flows in horizontal cylindrical annuli by the authors [1] revealed a rather unusual flow oscillation the characteristics of which had not been previously reported in the literature.

This report was followed by articles [2,3] which gave descriptions of similar flows under varying by: Kumar presented a numerical study of the natural convection flow inside horizontal annuli. His study showed an interesting effect of the diameter ratio on the flow patterns at the same Ra.

For instance, crescent-shaped eddies dominate for the small diameter ratio, while kidney-shaped flow eddies are observed for the large diameter by: 4. In this paper the lattice Boltzmann method is used to investigate the effect of nanoparticles on natural convection heat transfer in two-dimensional horizontal annulus.

The study consists of an annular-shape enclosure, which is created between a heated triangular inner cylinder and a circular outer by: Multicellular flows induced by natural convection in a porous horizontal cylindrical annulus Article (PDF Available) in Physical and Chemical News January with 90 Reads.

The natural convection heat transfer in a horizontal cylindrical annulus has been a classical subject of research, and it can be characterized by two dimensionless parameters: the Rayleigh number (Ra) and the Prandtl number (Pr).

The Prandtl number is the ratio of viscous Natural convective flows in horizontal cylindrical annuli book to thermal by: 3. [5] shows the flow becoming unstable. Physical oscillations appear when the Rayleigh number is increased. In the present study three-dimensional analysis of the transitional flow in natural convection in horizontal cylindrical annulus was performed, using Large-Eddy Simulation (LES) methodology with dynamical sub-grid scale model.

The. Prandtl number on the flow patterns, as well as the critical Rayleigh number, are systematically investigated. Problem Statement and Mathematical Model A schematic diagram of the physical model of the investigated system is shown in Fig.

The natural convection in a horizontal cylindrical annulus with an inner radius R i and an outer radius R. A Parametric Study of Prandtl Number and Diameter Ratio Effects on Natural Convection Heat Transfer in Horizontal Cylindrical Annuli ASME JOURNAL OF HEAT TRANSFER, by: 6.

Combined natural convection and radiation in a two-dimensional horizontal annulus filled with a radiatively participating gray medium is studied numerically by using a control-volume-based finite difference method and a spectral collocation method coupled with an influence matrix technique.

The mathematical model includes the continuity equation, the incompressible Navier-Stokes equations, the energy equation, and the radiative transfer equation Cited by: Natural convection in horizontal annuli: a lower bound for the energy T o be more precise, by discussing (30) one sees that for any arbitrary Ra ∗ > 0 a number A (Ra ∗) can be found.

[4] conducted an investigation on natural convection in concentric and eccentric horizontal cylindrical annuli with mixed boundary conditions.

In [5], natural convection in a narrow horizontal cylindrical annulus for fluid of P r ≤ been investigated. Also [6] discussed the existence of dual solution and role of Prandtl number on by: 1. Natural convection within horizontal annuli is a classic but very complicated problem used for heat transfer.

Using this method, many practical applications have been found in double-pipe heat. Natural convection in horizontal cylindrical annuli with fins D. Alshahrani a and O. Zeitoun b a Mech. Eng. Dept., College of Eng., King Saud University, Riyadh, Saudi Arabia. Abstract. Natural convection in concentric, vertical annuli filled with saturated porous media is reviewed in this paper.

Relevant works related to different thermal boundary conditions are discussed first, the attention being focused on analytical and numerical solutions for the Darcy flow by:   Instabilities and transitions of natural convection in a narrow horizontal concentric annulus are investigated theoretically by assuming two-dimensional and incompressible flow fields.

It is assumed that the inner cylinder is kept at a higher temperature than the outer cylinder. Steady solutions for the natural convection are obtained numerically by Newton–Raphson’s method for various Cited by: Multicellular natural convective flows in narrow horizontal air-filled concentric annuli are considered numerically in this paper.

The results show that the multiplicity of the multicellular upper flows reported in the literature can be credited to the existence of an imperfect bifurcation with two stable by: The results of a finite-difference solution for natural convection within horizontal cylindrical annuli for Prandtl numbers near (air) are presented.

The ranges of Rayleigh number and inverse relative gap width over which such a solution yields valid results are by:   Natural convection in the gap between two infinitely long horizontal coaxial cylindrical surfaces, each of which is maintained at constant temperature, is studied.

If the inverse relative gap width $${\mathcal{A}}$$ is large, relevant steady convective flow and considerable heat transfer are observed, even for extremely small Rayleigh numbers by: 6.

Natural convection in a horizontal cylindrical annulus using porous fins Natural convection in a horizontal cylindrical annulus using porous fins S. Kiwan; O. Zeitoun Purpose – The aim is to study the effects of fin conductivity ratio, Darcy number, and Rayleigh number on the average Nusselt number for fins made of porous material when attached to the inner .Linear stability analyses for two-dimensional natural convection in horizontal air-filled annuli are performed for three-dimensional perturbations and radius ratios in the range ⩽R⩽3.

Flow trans Cited by:   An experimental and theoretical study of natural convection in the annulus between horizontal concentric cylinders - Volume 74 Issue 4 - T.

H. Kuehn, R. J. GoldsteinCited by: