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Lecture 2 Mass Transfer

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mass transfer lecture
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  Combustion Technology and Chemical Reactors MASS TRANSFER 2 ND  LECTURE  ANDERS C. OLESEN POST DOC, PH.D.  Combustion Technology and Chemical Reactors  –  Mass Transfer 2 Course Curriculum Lecture No:   Topic   Literature   1  Introduction; Analogy between heat and mass transfer; Mass diffusion; Boundary conditions; Steady state mass diffusion through a wall [1] 14.1-14.5 2  Water vapor migration in buildings; Transient mass diffusion; Mass diffusion in a porous medium ; Diffusion in a moving medium [1] 14.6-14.8 3  Mass convection; Simultaneous heat and mass transfer [1] 14.9-14.10 [1] Y. Çengel: “ Heat and Mass Transfer: Fundamentals and  Applications”, 3 rd  ed.  Combustion Technology and Chemical Reactors  –  Mass Transfer 4 Todays lecture ã Water vapor migration in buildings ã Transient mass diffusion ã Mass diffusion in a porous medium ã Mass diffusion in a moving medium ã Irreversible thermodynamics ( i.e.  Maxwell-Stefan diffusion of a binary mixture) ã  Assignments  Combustion Technology and Chemical Reactors  –  Mass Transfer 5 Water vapor migration in buildings ã Moisture transport in building materials (e.g. wood) is important because of dimension changes with moisture content ã Excess moisture can also lead to: ã Corrosion  and rusting of metals ã Rotting  of woods ã Peeling  of paint ã Molds  grow on wood at a relative humidity of higher than 85 % ã Moisture content also affects the effective conductivity of porous materials  –   heat transfer increases with moisture content
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