ABOUT THE COURSE:Convective heat transfer is a mode of heat transfer having a wide range of practical applications from the area of heat exchangers, boiling and condensation, nuclear reactor thermal hydraulics and electronic cooling. This course covers the basics of convection from fundamentals, emphasizing on the Fluid mechanics basics in the process. Scaling analysis which gives a physical feel for the various terms is introduced. Similarity and Integral method solutions are explored for obtaining Nusselt number for various situations. Natural convection is also studied in detail with emphasis on fundamentals and scaling approaches covered. Lastly, some applications in the area of boiling and condensation, electronic cooling and heat pipes are considered.INTENDED AUDIENCE: BE/B.Tech (Final year as elective), ME/M.Tech ElectivePREREQUISITES: Completed UG course on Heat Transfer or equivalent.INDUSTRY SUPPORT: BARC, NPCIL, AERB, IGCAR, NTPC, ISRO, DRDO, L&T and other organizations doing work in the area of heat transfer

Syllabus

Week 1: Convection – Types of convection, Newton’s law of cooling, Definition of heat transfer coefficient, Nusselt number, understanding of terms – internal and external flows, laminar and turbulent flows, one, two and three dimensional flows, Turbulent flow – Turbulent viscosity, Turbulent thermal conductivity, velocity boundary layer, thermal boundary layer, Prandtl number
Differential analysis of fluid flow, linear motion and deformation, Translation, linear deformation, angular motion and deformation
Week 2:Fluid acceleration, Reynolds Transport Theorem, Conservation of Mass and Momentum Equation derivation
Week 3:Energy equation derivation, Scale Analysis
Week 4:Non-dimensionalization and Dimensional Similarity, Reynolds analogy. Introduction to Similarity Method and Blasius Solution for flow over flat plate. Similarity Method for Energy equation
Week 5:Introduction to various thicknesses, Integral method
Week 6:Introduction to turbulence, Reynolds averaging, Eddy diffusivity of momentum and heat, Universal velocity distribution, friction factor for hydraulically smooth and rough pipes
Week 7:Velocity distribution in turbulent flow, Internal flow – mean velocity, bulk mean temperature, hydraulic diameter, developing and fully developed flows (hydrodynamic and thermal) for fluids with Pr < 1 and Pr > 1, General thermal analysis for heat fluid flow in a pipe with constant surface heat flux
Week 8:General thermal analysis for heat fluid flow in a pipe with constant wall temperature, concept of NTU. Introduction to Natural Convection, Scaling analysis, Prandtl number less than and greater than 1 cases, Richardson number
Week 9:Natural convection in a vertical channel at constant wall temperatures, Optimal cooling of stack of vertical plates, Effect of viscous dissipation on Nusselt number in forced convection. Introduction of two – phase flow and heat transfer, Pool boiling curve, Flow boiling
Week 10:Basics of Flow boiling, Critical heat flux, Introduction to film boiling, condensation, Introduction to electronics cooling
Week 11:Convective heat transfer in electronics, adiabatic heat transfer coefficient, heat sinks design, natural convection
Week 12:Heat Pipes, Thermal design of electronic equipment