Heat Transfer Due To Laminar Natural Convection Of Nanofluids Theory And Calculation Introduction

Using Al2O3-water nanofluid as an example, this book presents a theoretical study on heat transfer of nanofluid's laminar natural convection. An innovative method of similarity transformation of velocity fields on laminar boundary layers is applied for development of a mathematical governing model of natural convection with actual nanofluids. An innovative model of nanofluid's variable thermophysical properties is developed by a mathematical analysis based on the developed model of variable physical properties of fluids combined with the model of nanofluid's thermal conductivity and viscosity. Based on the innovative method of similarity transformation and the innovative model of nanofluids variable thermophysical properties, the physical property factors of nanofluids are produced. It leads to a simultaneous solution for deep investigations of hydrodynamics and heat transfer of nanofluids natural convection. Innovative predictive formulae are proposed for the evaluation of heat transfer of Al2O3-water nanofluid's natural convection. The predictive formulae have reliable theoretical and practical value because they are developed by rigorous theoretical analysis of heat transfer combined with comprehensive consideration of effects of temperature-dependent physical properties of nanofluids and the nanoparticle shape factor and concentration, as well as variations of fluid boundary temperatures. The conversion factors proposed help to turn the heat transfer coefficient and rate of fluid natural convection to those of nanofluid natural convection. Furthermore, several calculation examples are provided to demonstrate the heat transfer application of the proposed predictive formulae.