Credit Structure:(3-0)3

Catalog Description:
Time-independent non-Newtonian fluids, structural time-dependency, Linear viscoelasticity, suspensions, viscometric and extensional flows, measurable rheological properties, experimental methods for rheological propery measurements. Applications to glassmaking, paint, coatings and polymer industries.

Course Objectives:
This course in intended to introduce the student to the field of non-Newtonian flow of liquids and liquid-like subtances such as suspensions, emulsions and molten polymers. This will include definition of pertinent material functions and techniques for measuring the rehological and mechanical properties of liquids as well as the use of property data to solve engineering problems. Special emphasis will be placed on industries not covered in the required courses.

Prerequisites:
None

Textbook(s):
P.Sherman, "Industrial Rheology", Academic Press, 1970
J.M.Dealy, "Rheometers for Molten Plastics", Van Nostrand Reinhold, 1982
J.R.Van Wazer et al., "Viscosity and Flow Measurement", Wiley-Interscience, 1963
Also some printed notes will be distributed from time to time.

Reference:
None

Syllabus:
I.Introduction:. Types of matiral response.The role of rheology in continuum mechanics. Continuity and Cauchy's equations (1 week)
II.Newtonian Fluids: Navier-stokes equation. Viscosity of liquids, viscous dissipation. Viscometry. Glassmaking industry. Lubricating oils. (2 weeks)
III.Non-Newtonian, time-independent fluids. Types of Behavior in simple shear. Forms of the viscosity function. Rational mechanics of materials; constitutive equations. Viscometric flows. Measurement of viscometric functions. Flow of Non-Newtonian fluids (2 weeks)
IV.Rheoloyg of Disperse Systems. Microorheology of suspensions. Plasticity. Structural time dependency (thixotropy, rheopecty). Printing inks. Paints and Coatings, Flow of pulp suspensions. Emulsions (2 weeks)
V.Elastic liquids: Elastic phenomena. Linear viscoelasticity (LVE). Material functions (relaxation spectrum, creep compliance, dynamic viscosity, loss modulus, etc) and their interrelations, Boltzman superposition principle. Rotational flows used to measure LVE properties. (3 weeks)
VI.Uniform Extentional Flows: Definitions and basic equations. Experimental methods. (2 weeks)
VII. Applications in polymer industry: Flow tests and property measurement. Complex flows (rod climbing, swell, melt fracture) (2 hours)
Laboratory (2 hours)

Homeworks, Quizzes, Projects:
Monthly homeworks are given

Computer Usage:
None

Laboratory work:
Two hours on viscosity measurements

Category Content:
Mathematics and Basic Sciences: None
Engineering Design: None
Engineering Sciences: 3 credits
Humanities & Social Sciences: None
Departmental: None

Instructors:
Ülkü Yilmazer