Journal ArticleDOI
Correlating equations for natural convection heat transfer between horizontal circular cylinders
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In this paper, a conduction boundary-layer model is used for heat transfer by conduction, laminar flow and turbulent flow. Butler et al. obtained a correlation for convection from a free horizontal cylinder as the outer cylinder diameter becomes infinite and for quasi-steady heat transfer to fluid within a horizontal cylinder.About:
This article is published in International Journal of Heat and Mass Transfer.The article was published on 1976-10-01. It has received 257 citations till now. The article focuses on the topics: Churchill–Bernstein equation & Heat transfer.read more
Citations
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Journal ArticleDOI
Free Convection Heat Transfer from Horizontal Cylinders
TL;DR: In this paper, a set of empirical correlation equations for the prediction of Nu numbers for Rayleigh number range 3.6 × 104 < Ra < 9.2 × 105 or 3.8 × 106 and Pr number range 4.5 ≤ Pr ≤ 160 has been developed.
Journal ArticleDOI
Temperature and Electric Field Distribution Characteristics of a DC-GIL Basin-Type Spacer with 3D Modelling and Simulation
TL;DR: In this article, the temperature properties of real-type direct-current gas-insulated transmission lines (DC-GIL) with a basin-type spacer were investigated by the finite element method.
Journal ArticleDOI
Laminar natural convection of cold water enclosed in a horizontal annulus with mixed boundary conditions
Ching-Jenq Ho,Y. H. Lin +1 more
TL;DR: In this article, a computational analysis of steady laminar natural convection of cold water within a horizontal annulus with constant heat flux on the inner wall and a fixed temperature on the outer surface has been undertaken to explore the occurrence of density inversion of water and its effects on the flow and temperature fields.
Proceedings ArticleDOI
Numerical solution of natural convection in eccentric annuli
TL;DR: In this article, the governing equations for transient natural convection in eccentric annular space are solved with two high-order accurate numerical algorithms, and the equation set is transformed into bipolar coordinates and split into two one-dimensional equations: finite elements are used in the direction normal to the cylinder surfaces; the pseudospectral technique is used in azimuthal direction.
Journal ArticleDOI
Study of Natural Convection in an Enclosure Bounded by Two Concentric Cylinders and Two Diametric Planes
TL;DR: In this paper, the influence of modified Grashof number (10 2 ≤Gr≤10 6 ) and an aspect F r on convective motion and heat transfer is examined.
References
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Journal ArticleDOI
Correlating equations for laminar and turbulent free convection from a horizontal cylinder
TL;DR: In this article, a simple empirical expression for the mean value of Nu over the cylinder for all Ra and all Pr is developed in terms of the model of Churchill and Usagi.
Journal ArticleDOI
A general expression for the correlation of rates of transfer and other phenomena
Stuart W. Churchill,R. Usagi +1 more
TL;DR: The expression Y = (1 + Zn)1/n where Y and Z are expressed in terms of the solutions for asymptotically large and small values of the independent variable is shown to be remarkably successful in correlating rates of transfer for processes which vary uniformly between these limiting cases as discussed by the authors.
Journal ArticleDOI
An experimental and theoretical study of natural convection in the annulus between horizontal concentric cylinders
TL;DR: In this paper, an experimental and theoretical-numerical investigation has been carried out to extend existing knowledge of velocity and temperature distributions and local heat-transfer coefficients for naturel convection within a horizontal annulus.
Book ChapterDOI
A General Method of Obtaining Approximate Solutions to Laminar and Turbulent Free Convection Problems
G. D. Raithby,K.G.T. Hollands +1 more
TL;DR: In this paper, the authors focus on determining equations for the local and mean rate of laminar heat transfer, which are approximately valid for different geometries by use of these equations, several new correlations are obtained for various heat transfer problems, and the results compared with experiments.
Journal ArticleDOI
Laminar free convection in boundary layers near horizontal cylinders and vertical axisymmetric bodies
D. A. Saville,S. W. Churchill +1 more
TL;DR: In this paper, the problem of describing free convection near either horizontal cylinders or vertical axisymmetric bodies with fairly arbitrary body contours is studied and the solutions of two coupled, coupled, partial differential equations, for the temperature and stream functions, are represented by series which are universal with respect to body shapes within a specified class of body shapes.