Heat & Mass Transfer1. Unit-1
2. Unit-2 13/10/2012
Shared by: Sapna Awanti(GEC, Raipur) 3. Unit-3 13/10/2012
Shared by: Sapna Awanti(GEC, Raipur) 4. Unit-4 13/10/2012
Shared by: Sapna Awanti(GEC, Raipur) 5. Unit-5 13/10/2012
Shared by: Sapna Awanti(GEC, Raipur) |
Heat & Mass Transfer SyllabusUNIT – I
Introduction Various modes of heat transfer, Fourier’s, Newton’s and Stefan Boltzman’s Law, Combined modes of heat transfer, thermal transfer, thermal diffusivity, overall heat transfer coefficient. Conduction The thermal conductivity of solids, liquids and gases, factors influencing conductivity measurement. The general differential equation of conduction. One dimensional steady state conduction, linear heat flow through a plane and composite wall, tube and sphere, critical thickness of insulation, Effect of variable thermal conductivity, Conduction with heat generation in flat and cylinders. UNIT - II Fins Conduction convection system, extended surfaces rectangular, triangular, circumferential and pin fins. General conduction analysis, fins of uniform and non-uniform cross sectional area. Heat dissipated by a fin. Effectiveness and efficiency of fins. Approximate solution. Design of fins for maximum heat transfer. Solution for different boundary condition. Use of fin analysis for measuring temperature error of Thermometer. Transient/Unsteady State Heat Conduction System with negligible internal resistance, Lumped capacity method and its Validity. Unsteady state conduction through finite and semi- infinite slab without surface resistance, convection boundary conditions. Solution through Heisler`s chart. UNIT – III Forced Convection Physical Mechanism of Forced Convection, Dimensional analysis for forced convection, velocity and Thermal Boundary layer, Flow over plates, Flow across cylinders and spheres, Flow in tubes, Reynold’s analogy. Natural Convection Physical Mechanism of Natural Convection, Dimensional analysis of natural convection; empirical relationship for natural convection. UNIT IV Two Phase Heat Transfer Boiling heat transfer, Pool boiling, boiling regimes and boiling curve, next transfer correlations in pool boiling. Condensation heat transfer, Film condensation, derivation for the average heat transfer coefficient ‘h’ for the case of laminar film condensation over vertical plate, Heat transfer correlation for inclined plates, vertical tubes, Horizontal bank tubes. Heat Exchangers Different types of heat exchangers; Determination of heat exchanger performance, Heat exchanger transfer units, Analysis restricted to parallel and counter flow heat exchanger (LMTD and NTU method) UNIT V Thermal Radiation Introduction, absorption and reflection of radiant energy, Emission, Radiosity and irradiation, Black and non black bodies, Kirchoff’s law; intensity of radiation, radiation exchange between black surface, geometric configuration factor. Grey body relation exchange between surface of unit configuration factors. Electrical analogy to simple problems. Non-luminous gas radiation. Errors in temperature measurement due to radiation. Introduction to Mass Transfer Mass and mole concentrations, molecular diffusion, eddy diffusion, Molecular diffusion from an evaporating fluid surface, Introduction to mass transfer in laminar and turbulent convection Combined heat and mass transfer, the wet and dry bulb thermometer. |