Thursday, March 18, 2010

DMCHE 406 Transport Phenomena


ANDHRA UNIVERSITY DMCHE 406: Transport Phenomena

UNIT-I
Momentum Transport: Viscosity and the Mechanism of Momentum Transport (i) Newton's Law of Viscosity, (ii) Non-Newtonian fluids and (iii) Pressure and Temperature dependence of Viscosity. Velocity distributions in laminar flow: (i) Shell momentum balances boundary conditions (ii) Flow of a falling film, (iii) Flow through a circular tube (iv) Flow through an annulus. The Equations of change for isothermal systems: (i) The equations of continuity, motion and mechanical energy in rectangular and curvilinear coordinates, (ii) Use of the equations of change to set up steady flow problems (iii) Dimensional analysis of the equations of change. Velocity distributions with more than one independent variable (i) Unsteady viscous flow.
Velocity distributions in Turbulent flow: (i) Fluctuations and time smoothed quantities, (ii) Time-smoothing of the equations of change for an incompressible fluid, (iii) Semi empirical expressions for the Reynolds stresses. Interphase transport in isothermal systems : (i) Definition of friction factors (ii) Friction factors for flow in tubes (iii) Friction factors for flow around spheres.

UNIT-II
Energy Transport: Thermal conductivity and the mechanism of energy transport: (i)Fourier's law of heat conduction (ii) Temperature and pressure dependence of thermal conductivity in gases and liquids. Temperature distributions in solids and in laminar flow: (i) Shell energy balances-boundary conditions (ii) Heat conduction with an electrical heat source (iii) Heat conduction with a viscous heat source (iv) Heat conduction through composite walls (v) Forced convection and (vi) Free convection. The equations of change for non-isothermal systems : (i) The equation of energy in rectangular and curvilinear coordinates, (ii) the equations of motion for forced and free convection in non-isothermal flow (iii) Use of the equations of change to set up steady state heat transfer problems, and (iv) Dimensional analysis of the equations of change. Temperature distribution with more than one independent variable: (i) Unstate heat conduction in solids. Temperature distribution in turbulent flow: (i) Temperature fluctuations and the time-smoothed temperature, (ii) Time smoothing the energy equation (iii) Semi empirical expressions for the turbulent energy flux. Interphase transport in non-isothermal systems : (i) Definition of the heat transfer coefficient (ii) Heat transfer coefficients for forced convection in tubes and around submerged objects, and (iii) Heat transfer coefficients for free convection.

UNIT-III
Mass Transport: Diffusivity & mechanism of mass transport :(i) Definitions of concentrations, velocities, mass fluxes(ii)Fick's law of Diffusion(iii)Temperature & pressure dependence of mass diffusivity. Concentration distribution in solids and in laminar flow: (i) Shell mass balances - boundary conditions, (ii) Diffusion through a stagnant gas film, (iii) Diffusion with heterogeneous chemical reaction (iv) Diffusion with homogeneous chemical reaction and (v) Diffusion into a falling liquid film. The equations of change for multicomponent systems:(i) The equations of continuity for a binary mixture (ii) The equations of continuity of A in curvilinear coordinates and (iii) Dimensional analysis of the equations of change for a binary isothermal fluid mixture. Concentration distributions in turbulent flow:(i)Concentration fluctuations and the time smoothed concentration (ii) Time-smoothing of the equation of continuity of A. Interphase transport in multicomponent ystems:(i)Definition of binary mass transfer coefficients in one phase, (ii) Correlations of binary mass-transfer coefficients in one phase at low mass-transfer rates (iii) Definition of binary mass-transfer coefficients in two phases at low mass-transfer rates, and (iv) Definition of the transfer coefficients for high mass transfer rates.

Text Book:1 Transport Phenomena-R Byron Bird, Warran E Steward&Edwin N Lightfoot, John Wiley & Sons, Inc. New York.
Ref.Books:1.Transport Phenomena-Robert S Brodkey & Harry C Hershey,MGH Co, NY
2.Transport Phenomena for Engineers-LouisTheodore,Int-book Company,London.3. Transport Phenomena-W.J.Book and K.M.K.Multzall,JW&Sons-Ltd,London,;
4.Fundamentals of Momentum, Heat and Mass Transfer-Mames R Welty, Charles E Wicks, Robert E Wilson, J W & Sons Inc. N Y.5. Fluid Dynamics and Heat Transfer by James G Knudsen and Doald L. Katz, MGH Co. Inc., NY.



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