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Natural convection
About: Natural convection is a research topic. Over the lifetime, 29521 publications have been published within this topic receiving 608747 citations.
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TL;DR: In this article, an apparently paradoxical behaviour of heat transfer deterioration was observed in nano-fluid and its dependence on parameters such as particle concentration, material of the particles and geometry of the containing cavity have been investigated.
Abstract: Fluids with nano size solid particles suspended in them have been given the name nano-fluid which in recent studies have shown tremendous promise as heat transfer fluids. However, before suggesting such fluids for applications a thorough knowledge of physical mechanism of heat transfer in such fluids is wanted. The present study deals with one such aspect of natural convection of nano fluids inside horizontal cylinder heated from one end and cooled from the other. An apparently paradoxical behaviour of heat transfer deterioration was observed in the experimental study. Nature of this deterioration and its dependence on parameters such as particle concentration, material of the particles and geometry of the containing cavity have been investigated. The fluid shows characters distinct from that of common slurries.
906 citations
TL;DR: In this article, a single comprehensive equation is developed for the rate of heat and mass transfer from a circular cylinder in crossflow, covering a complete range of Pr (or Sc) and the entire range of Re for which data are available.
Abstract: A single comprehensive equation is developed for the rate of heat and mass transfer from a circular cylinder in crossflow, covering a complete range of Pr (or Sc) and the entire range of Re for which data are available. This expression is a lower bound (except possibly for RePr < 0.2); free-stream turbulence, end effects, channel blockage, free convection, etc., may increase the rate. In the complete absence of free convection, the theoretical expression of Nakai and Okazaki may be more accurate for RePr < 0.2. The correlating equation is based on theoretical results for the effect of Pr in the laminar boundary layer, and on both theoretical and experimental results for the effect of Re. The process of correlation reveals the need for theoretical results for the effect of Pr in the region of the wake. Additional experimental data for the effect of Pr at small Pe and for the effect of Re during the transition in the point of separation are also needed.
849 citations
TL;DR: In this article, a review summarizes results for Rayleigh-Benard convection that have been obtained over the past decade or so, focusing on convection in compressed gases and gas mixtures with Prandtl numbers near one and smaller.
Abstract: ▪ Abstract This review summarizes results for Rayleigh-Benard convection that have been obtained over the past decade or so. It concentrates on convection in compressed gases and gas mixtures with Prandtl numbers near one and smaller. In addition to the classical problem of a horizontal stationary fluid layer heated from below, it also briefly covers convection in such a layer with rotation about a vertical axis, with inclination, and with modulation of the vertical acceleration.
823 citations
Book•
01 Dec 2006
TL;DR: In this paper, the authors present an overview of the basic concepts in Heat Conduction Equation (HCE) and its application in the context of refrigeration and freezing of foods.
Abstract: 1 Introduction and Basic Concepts 2 Heat Conduction Equation 3 Steady Heat Conduction 4 Transient Heat Conduction 5 Numerical Methods in Heat Conduction 6 Fundamentals of Convection 7 External Forced Convection 8 Internal Forced Convection 9 Natural Convection 10 Boiling and Condensation 11 Heat Exchangers 12 Fundamentals of Radiation 13 Radiation Heat Transfer 14 Mass Transfer Appendix 1 Property Tables and Charts (SI Units) Appendix 2 Property Tables and Charts (English Units) Appendix 3 Introduction to EES Online Chapters 15 Cooling of Electronic Equipment 16 Heating and Cooling of Buildings 17 Refrigeration and Freezing of Foods
816 citations
TL;DR: In this article, an analysis is made for steady free convection about a vertical flat plate embedded in a saturated porous medium at high Rayleigh numbers, where boundary layer thickness, local and overall surface heat flux, and local and average heat transfer coefficients are derived for an isothermal dike intruded in an aquifer.
Abstract: An analysis is made for steady free convection about a vertical flat plate embedded in a saturated porous medium at high Rayleigh numbers. Within the framework of boundary layer approximations, similarity solutions are obtained for a class of problems where wall temperature varies as xλ, i.e., a power function of distance from the origin where wall temperature begins to deviate from that of the surrounding fluids. Analytical expressions are obtained for boundary layer thickness, local and overall surface heat flux, and local and average heat transfer coefficients. Application to convective heat transfer about an isothermal dike intruded in an aquifer is discussed.
811 citations