Heat transfer

About: Heat transfer is a research topic. Over the lifetime, 181795 publications have been published within this topic receiving 2923586 citations. The topic is also known as: heat exchange.

Handbook of phase change : boiling and condensation

Abstract: Preface Nomenclature Contributors 1.Vapor Liquid Equilibrium Properties 2.Representation of Solid-Liquid-Vapor Phase Interactions 3.Boiling Curve 4.Nucleate Boiling 5.Enhancement Techniques in Pool Boiling 6.Critical Heat Flux in Pool Boiling 7.Film and Transition Boiling 8.Introduction and Basic Models 8.Fluid Mechanics Aspects of Two-Phase Flow 9.Fluid Mechanics Aspects of Two-Phase Flow 10.Two-Phase Flow Instabilities 11.Critical Two-Phase Flow 12.Two-Phase Flow and Boiling Heat Transfer in Tube Bundles 13.External Flow Film Boiling 14.Augmentation Techniques and External Flow Boiling 15.Flow Boiling in Circular Tubes 16.Flow Boiling in Advanced Geometries and Applications 17.CHF and Post-CHF (Post-Dryout) Heat Transfer 18.Flow Boiling Augmentation 19.Film Condensation 20.Dropwise Condensation 21.Direct Contact Condensation 22.Augementation Techniques in External Condensation 23.Heat Transfer and Pressure Drop in Internal Flow Condensation 24.Augementation Techniques and Condensation Inside Advanced Geometries 25.Instrumentation in Boiling and Condensation Studies Conversion Factors for Commonly Used Quantities Conversion Factors in Different Units Index

Heat and mass transport

Abstract: As mentioned in Chapter 1 the equations governing heat transfer with small temperature differences also govern transfer of small concentrations of other passive scalar contaminants. Particle-laden flows (Chapter 7) are excluded unless the particles are so small that they move with the flow and are negligibly affected by gravity. For convenience the discussion below is phrased in terms of heat transfer but translation to pollutant-transfer problems is straightforward. We use C, c for the mean and fluctuating parts of the concentration or temperature, for generality.

The incipience of nucleate boiling in forced convection flow

Abstract: An analysis of the incipience of nucleate boiling is developed as a modification and extension of previous analyses. The results are compared with data for subcooled boiling of water in forced convection flow. Apparent anomalies in the data for the onset of boiling in two-phase gas-liquid flow are shown to be a result of a limited size range of cavities on the heater surfaces. Measurements of the surface characteristics of a copper heating tube were made and compared with incipient boiling heat transfer data taken in that tube. The results predicted from the theoretical analysis are consistent with the experimental heat transfer data.

Heat transfer to newtonian and non-newtonian fluids in rectangular ducts

Abstract: Publisher Summary This chapter provides an overview of the analytical and experimental hydrodynamics and heat transfer studies of Newtonian and non-Newtonian fluids in laminar and turbulent flow through rectangular tubes. The chapter in particular focuses on the rectangular duct geometry, with emphasis on the friction factor and heat transfer behavior of non-Newtonian fluids. It is recognized that non-Newtonian behavior is generally more complicated than Newtonian flow. In the case of non-Newtonian fluids, the theoretical predictions yield low estimates of the heat transfer under laminar flow conditions. The fact that the available experimental heat transfer measurements lie above the predictions could reflect an inadequacy in the analytical model. For non-Newtonians in turbulent flow through rectangular channels, the situation is even more complicated. Some non-Newtonian fluids act as pseudoplastics, showing some reduction in friction and heat transfer as compared with a Newtonian fluid. Other non-Newtonian fluids experience large reductions in the friction factor and in heat transfer under turbulent flow conditions.