Journal ArticleDOI
Correlating equations for natural convection heat transfer between horizontal circular cylinders
Reads0
Chats0
TLDR
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
More filters
Journal ArticleDOI
Numerical study of conduction and convection heat losses from a half-insulated air-filled annulus of the receiver of a parabolic trough collector
Hany Al-Ansary,O. Zeitoun +1 more
TL;DR: In this paper, a heat-resistant thermal insulation material is fitted into the portion of the receiver annulus that does not receive concentrated sunlight, which is expected to reduce not only convection heat losses, but also radiation losses.
Journal ArticleDOI
Natural convection from pin fin arrays
TL;DR: In this article, the most important geometric parameter influencing the heat transfer from pin fin arrays is the ratio of the fin diameter to the center-to-center spacing, and the experimental results indicate that a pin fin array performs better than a plate fin array under the same conditions.
Journal ArticleDOI
Study on combined heat loss of a dish receiver with quartz glass cover
TL;DR: In this article, a cavity receiver with quartz glass cover is presented for the dish concentrating system, and a two-dimensional model for the heat transfer process that combines the natural convection and the surface radiation is proposed and developed.
Journal ArticleDOI
Natural convection heat transfer from helicoidal pipes
R. C. Xin,M.A. Ebadian +1 more
TL;DR: In this paper, an experimental investigation on natural convection heat transfer in air from the outer surface of constant heat flux helicoidal pipes with vertical and horizontal orientations was performed and the temperatures along the flow direction and peripheral direction of the tube wall were measured.
Simplified Methodology for Designing Parabolic Trough Solar Power Plants
TL;DR: In this paper, a detailed solar power plant simulation and analysis of its components is needed for the design of parabolic trough solar systems which is the subject of this research, and preliminary analysis was carried out by complex models of the solar field components.
References
More filters
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.