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Introduction - CHE 320 Transport Phenomena Spring 2004 D J...

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Unformatted text preview: CHE 320 Transport Phenomena Spring 2004 D. J. Klingenberg Introductory Lecture 1 What are “Transport Phenomena”? o Fluid mechanics (Momentum transport) 0 Heat transfer (Energy transport) 0 Mass transfer (mass transport) 2 Why study them? 0 Important in a variety of industrial, natural and biological processes — Industrial processes (examples) * Chemical processing: pump fluid to reactor (fluid mechanics), react (energy transport), and separate valuable products (mass transfer) ~ Natural processes (examples) >l< Hydrology (rivers, etc.) * Meteorology — Biological Processes (examples) * Transport of pharmaceuticals to locations in cells in the body. >|< Blood flow and blood diseases 0 You need this info for later courses — CBE 324, 326, 426, 430, 450, 470 3 Why study all 3 together? 0 All 3 usually occur together. 0 Basic equations are similar. For example, fluxes: d1) dT _ dx A Tym = ‘ J 9y = _kd— jA,y = —CDAB— 3/ as a result, solution to one problem (e.g., in fluid mechanics), gives you solutions to other problems (e.g., heat transfer). 0 Similar mathematical tools for describing each. 0 Molecular mechanisms for each are similar. For example, all three have “diffusive” mechanisms of transport, arising from the thermal motions of the molecules. All three also have “convective” mechanisms as well. 4 The three levels of transport phenomena: A common theme in transport phenomena is to learn to describe and understand transport processes at three levels: 0 Macroscopic (big picture) 0 Microscopic (over length scales much smaller than the equipment size) 0 Molecular (what the molecules are doing to efiect transport). We Will be going through each of the transport phenomena at each of these three levels (and the book is organized this way). ...
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