Předmět Transfer phenomena in tex.fibres and tec (KHT / TRP)

Na serveru studentino.cz naleznete nejrůznější studijní materiály: zápisky z přednášek nebo cvičení, vzorové testy, seminární práce, domácí úkoly a další z předmětu KHT / TRP - Transfer phenomena in tex.fibres and tec, Fakulta textilní, Technická univerzita v Liberci (TUL).

Materiál	Typ	Datum	Počet stažení

Obsah

Lecture contents:1. Basic functions of clothing. Textile technologies based on transfer of impulse, heat and mass.2. Equation of Bernoulli. Navier-Stokes equations. Theory of similarity. Reynolds and Prandtl numbers.Surface friction drag.3. Steady state heat transfer by conduction. Thermal constants of polymers. Thermal conductivity andresistance. Electro-thermal analogy.4. Convection heat transfer. Heat transfer coefficient and boundary layer. Boundary conditions. Transientheating of thin plate by means of forced convection.5. Free convection. Grasshof number. The effect of objects geometry on Nusselt number.6. Heat transfer by radiation. Wien and Stephan-Boltzman laws. Black and grey body. Surface emissivity.Radiation coefficients.7. Emission properties of fabrics. Heating of a thin plate by means of radiation heat flow.8. Fourier´s solution of parc. dif. equation of transient heat conduction applied for thick plate. Initial andboundary conditions. Solution by means of a diagram containing dimesionles numbers Fourier and Biot.9. Simplified solution for steady state heat transfer in thick plate with boundary condition of 3rd order.Moisture transfer, Fick´s laws, capillarity, wetting and wicking.10. Bonding forces between moisture and materials. Principles of drying. Calculation of masss transfercoefficient by means of Sherwood and Schmidt dimensionless numbers. Design of textile stenters.11. Analogy between heat and moisture transfer. Lewis relationship. Theoretical analysis of psychro-metricinstrument of air humidity determination.12. Thermophysiological comfort and its definition. Thermophysiological functions of human body. Generalequation of thermal equilibrioum of human body. Specific properties of various textile materials inrespect to thermal comfort of garments.13. Experimental methods of investigation of thermophysical properties of materials.

Získané způsobilosti

Student si osvojí znalosti z daného předmětu

Literatura

Hes, L., Sluka,:. Introduction into comfort of textiles. Textbook of Textile faculty of TU, Liberec 2005. Seidl, H.:. Introduction into flow of liquids and heat transfer (in Czech). Academia, Prague 1975. Steward, Bird, Lightfoot:. Transfer phenomena. Šesták, J.:. Transfer phenomena, I and II. Textbook of ČVUT Prague, 1983,1984.

Požadavky

Zápočet: vypracování semestrální práceZkouška: písemná + ústní

Garant

prof. Ing. Luboš Hes, DrSc.

Vyučující

prof. Ing. Luboš Hes, DrSc.