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
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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.Abstract:
Publisher Summary The first part of the chapter focuses 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 laminar heat transfer problems, and the results compared with experiments The problems considered involve heat transfer (1) from a cylinder, (2) from a sphere, (3) between concentric cylinders, (4) between concentric and eccentric spheres, (5) between vertical plates, and (6) from a nonisothermal vertical plate Attention is then turned to turbulent free convection heat transfer where the heat transfer from inclined plates and between differentially heated plates is considered A method of solving problems involving both laminar and turbulent convection is then outlined The criterion developed for the regions of applicability of the laminar and turbulent equations is shown to accurately predict the experimentally determined onset of instability of the laminar flow for free convection from an isolated plate A recommendation is then made for correlating heat transfer results in a clearer and more convenient wayread more
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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.
Journal ArticleDOI
Heat and flow characteristics of packed beds
TL;DR: In this paper, the state of the art for the heat and flow characteristics of packed beds under conditions where radiant heat transfer may be neglected is presented for the prediction of convective heat transfer, pressure drop, effective thermal conductivity, and wall heat transfer.
Journal ArticleDOI
Correlating equations for natural convection heat transfer between horizontal circular cylinders
TL;DR: 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.
Journal ArticleDOI
Heat transfer analysis and numerical simulation of a parabolic trough solar collector
TL;DR: In this paper, a detailed numerical heat transfer model based on the finite volume method for these equipment is presented, where the different elements of the receiver are discretised into several segments in both axial and azimuthal directions and energy balances are applied for each control volume.
Journal ArticleDOI
Correlation equations for free convection heat transfer in horizontal layers of air and water
TL;DR: In this paper, the authors reported new experimental measurements on the natural convective heat transport through a horizontal layer of air, covering the Rayleigh number range from subcritical to 4 × 106.
References
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Journal ArticleDOI
Heat dissipation of parallel plates by free convection
TL;DR: In this article, the warmeabgabe bei freier Konvektion in Luft von vertikalen quadratischen parallelen Platten of h × h cm2 im gegenseitigen Abstand b wird gemessen.
Journal ArticleDOI
Natural-convection heat transfer from a plate with arbitrary inclination
T. Fujii,Hideaki Imura +1 more
TL;DR: In this article, an experimental study is described concerning natural-convection heat transfer from a plate with arbitrary inclination, and the results of heat transfer coefficients are represented in the relation of average Nu number vs. Ra number.
Journal ArticleDOI
Developing laminar free convection between vertical flat plates with asymmetric heating
TL;DR: In this paper, a numerical and experimental investigation of the developing laminar free convection heat transfer in vertical parallel plate channels with asymmetric heating is presented, where the Nusselt number characterizing the total heat transfer to the fluid is found to be related to the Rayleigh number very nearly by a universal curve for all ratios of wall temperature differences.
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