70/0058-M - FUNDAMENTAL OF TRANSPORT PHENOMENA
Academic Year 2016/2017
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GIACOMO CAO (Tit.)
- Teaching style
- Lingua Insegnamento
|[70/77] CHEMICAL ENGINEERING||[77/00 - Ord. 2015] PERCORSO COMUNE||9||90|
This course introduces the fundamental principles governing the transport of momentum, energy, and mass. Students will practice solving relatively simple problems representing transport phenomena in various engineering operations. Analytical methods are typically employed to develop a quantitative understanding of transport phenomena characterized by spatial (one dimensional) or temporal changes. Students will be able to solve relatively simple problems representing transport phenomena in various engineering operations. Analytical methods are typically employed to develop a quantitative understanding of transport phenomena characterized by spatial (one dimensional) or temporal changes.
As indicated in the CCS instructions.
In particular, knowledge of calculus, chemistry, and physics (1st year, bachelor level) are strictly required.
Introduction to transport phenomena. Transport phenomena: general aspects. Macroscopic and local analysis. Balance equations. General formulation.
Molecular transport of momentum, heat and mass. Newton’s, Fourier’s and Fick’s laws. Definition and estimation of transport properties. Non-Newtonian fluids.
Macroscopic momentum, heat and mass balances. Macroscopic thermal energy and mass balances in steady and non-steady state. Definition of heat and mass transport coefficients. Dimensionless groups. Evaluation of heat and mass transport coefficients from dimensionless relationship. Turbulent flow. Definition and evaluation of friction factor. The macroscopic mechanical energy balance (Bernoulli equation). Drag force. Definition and evaluation of drag coefficient. Dimensional analysis. The Buckingham ¿ theorem. Free convection. Evaluation of heat transport coefficients for free convection problems.
Local momentum, heat and mass balances (one-dimensional problems). Momentum balances. Laminar and turbulent flows. The equation of motion (steady flow problems). Velocity distributions in one-dimensional problems. Poiseuille's law. Thermal energy balances. Temperature distributions in one-dimensional problems. Mass balances. Convective and diffusive fluxes. The equations of mass. Equimolar counterdiffusion. Diffusion through a stagnant medium. Concentration distribution.
Interphase heat and mass transport. Controlling resistance. Simultaneous heat and mass transport. Heat and mass transfer analogies.
Mass transfer effects on catalytic reactions. Examples of catalytic reactions. Diffusion and chemical reaction inside a porous catalyst. “The Effectiveness Factor”. Role of external and internal mass transfer. Diffusion and reaction limited regimes.
Mass transfer effects on fluid-fluid reactions. Examples of fluid-fluid reactions Interphase mass transport. Gas absorption with chemical reaction.
Mass transfer effects on fluid-solid non-catalytic reactions. Examples of fluid-solid non-catalytic reactions. General case. Sharp interface reaction.
Elements of energy transport by radiation. Nature of thermal radiation. Ideal radiant bodies. Real radiant bodies. Kirchhoff and Stefan-Boltzmann laws. Thermal radiation between planar surfaces. Thermal radiation between surfaces (black bodies) with arbitrary geometry.
Lectures (42 hours) and practical (42 hours) classes; seminars (6 hours)
In the framework of the course, the theory will be considered during lectures. In addition, the solution of practical problems will be also associated to the theoretical part. During this stage, the lecturer will involve the students in the examination of practical problems, to verify the level of their acquired knowledge and understanding relative to the subject under discussion. The latter one will be better evaluated during practical classes, to be performed either in group or singularly, to stimulate students to collaborate or handle autonomously, respectively.
Verification of learning
The evaluation will be expressed in fractions of 30. The examination will be performed orally and throug a written test which will contribute by at most 50% to the final evaluation.
The written test consists of 3 queries of practical problems. To each query is associated a specific score on a scale of 30, which is explicitly specified at the beginning of the test. The maximum evaluation (30/30), possibly cum laude, if the oral evaluation will be brilliant as well, will be achieved if all the replies to the queries are right.
-M.C. Annesini "Fenomeni di Trasporto: fondamenti e applicazioni" Edizioni Ingegneria 2000
-F.P. Foraboschi “Principi di Ingegneria Chimica”, UTET – Torino.
-A.S. Foust, L.A. Wenzel, C.W. Clump, L. Maus, L.B. Andersen “I Principi delle Operazioni Unitarie”, Ambrosiana - Milano.
-R. Mauri "Elementi di fenomeni di trasporto" Plus- Pisa University Press
-“The Transport Phenomena Problem Solver – Momentum, energy, mass” Research and Education Association – New Jersey
Blackboard, Computer (Power point slides)