|
Lecturer(s)
|
-
Hes Luboš, prof. Ing. DrSc.
-
Těšinová Pavla, Ing. Ph.D.
|
|
Course content
|
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 and resistance. Electro-thermal analogy. 4. Convection heat transfer. Heat transfer coefficient and boundary layer. Boundary conditions. Transient heating 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 and boundary 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 transfer coefficient 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-metric instrument of air humidity determination. 12. Thermophysiological comfort and its definition. Thermophysiological functions of human body. General equation of thermal equilibrioum of human body. Specific properties of various textile materials in respect to thermal comfort of garments. 13. Experimental methods of investigation of thermophysical properties of materials.
|
|
Learning activities and teaching methods
|
Monological explanation (lecture, presentation,briefing), Dialogue metods(conversation,discussion,brainstorming)
- Class attendance
- 28 hours per semester
|
|
Learning outcomes
|
Transfer phenomena in tex.fibres and tecnology
Student gets knowledges of this subject
|
|
Prerequisites
|
Knowledges from Bachelor study
|
|
Assessment methods and criteria
|
Oral exam, Written exam
Credit: work out homeworks Exam: writting and oral
|
|
Recommended literature
|
-
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..
|