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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Book ChapterDOI
Natural Convection Heat Transfer From Horizontal Cylinders
TL;DR: A vast amount of literature exists for natural convection from horizontal cylinders as mentioned in this paper, which can be divided into two main time periods: early investigators focused on analytical and experimental techniques, and modern investigations have focused on using computational fluid dynamics.
Journal ArticleDOI
Experimental and Numerical Investigation on Free Convection From a Horizontal Cylinder Located Above an Adiabatic Surface
TL;DR: In this article, the effects of the Rayleigh number and spacing from the adiabatic surface on both local and average Nusselt numbers around the cylinder are investigated.
Journal ArticleDOI
Numerical study of conjugate natural convection heat transfer of a blood filled horizontal concentric annulus
Ammar I. Alsabery,Ammar I. Alsabery,Kohilavani Naganthran,Fatin M. Azizul,Ishak Hashim,Roslinda Mohd. Nazar +5 more
TL;DR: In this paper, a numerical investigation is performed on the natural convection flow and heat transfer in a horizontal concentric annulus in the presence of cylindrical solid wall and Carreau non-Newtonian blood model.
Journal ArticleDOI
Unsteady natural convection heat transfer of nanofluid in an annulus with a sinusoidally heated source
TL;DR: In this paper, the authors studied the nonsmooth natural convection of nanofluid between the outer and inner surfaces of a concentric annulus, where the inner surface is heated sinusoidally with time about a fixed mean temperature but the outer boundary is kept at a constant temperature.
Journal ArticleDOI
Optimal eccentric annuli (Containing atmospheric-pressure air) for thermally insulating, horizontal, relatively cold pipes
TL;DR: In this paper, the geometrical configurations of those air-filled, horizontal eccentric annuli, that provide maximum thermal insulation corresponding to various imposed temperature conditions have been identified, and a simple correlation is presented which will permit the calculation of the associated steady-state rates of convective/conductive heat leak through the air annulus to the horizontal pipe conveying a chilled fluid.
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.