MIDTERM 02 - Viscosity and Rheology Flashcards
Title of Experiment 3
Viscosity determination
Refers to the internal friction or resistance of fluid to flow
Viscosity
Symbol for viscosity
η (Eta)
A branch of physics which deals with the deformation and flow of matter
Rheology
Type of flow that follows the Newtonian flow of direct proportionality between shearing stress and rate of shear
Newtonian flow
Castor oil (Type of flow)
Newtonian flow
Chloroform (Type of flow)
Newtonian flow
Ethanol (Type of flow)
Newtonian flow
Water (Type of flow)
Newtonian flow
Olive oil (Type of flow)
Newtonian flow
Type of flow characterized by the change in viscosity with increasing rate of shear
Non-Newtonian flow
3 types of non-Newtonian flow (PPD)
Plastic flow/Bingham body, Pseudoplastic flow, Dilatant flow
Yield value/yield stress must be applied to cause them to flow; its behavior is plasticity (Types of Non-Newtonian flow)
Plastic flow/Bingham body
Cerates (Type of Non-Newtonian flow)
Plastic flow
Cataplasm (Type of Non-Newtonian flow)
Plastic flow
Cream (Type of Non-Newtonian flow)
Plastic flow
Ointment (Type of Non-Newtonian flow)
Plastic flow
Butter (Type of Non-Newtonian flow)
Plastic flow
Pasta margarine (Type of Non-Newtonian flow)
Plastic flow
Characterized by shear thinning behavior; an increased rate of shear leads to decreased velocity (Types of Non-Newtonian flow)
Pseudoplastic flow
Natural and synthetic gum (Type of Non-Newtonian flow)
Pseudoplastic flow
Liquid dispersion or tragacanth (Type of Non-Newtonian flow)
Pseudoplastic flow
Characterized by shear thickening behavior; an increase in viscosity leads to an increase in rate of shear (Type of Non-Newtonian flow)
Dilatant flow
Paint (Type of Non-Newtonian flow)
Dilatant flow
Starch suspension in water (Type of Non-Newtonian flow)
Dilatant flow
Inorganic pigment in water (Type of Non-Newtonian flow)
Dilatant flow
2 instruments used for determining viscosity (SM)
Single point viscometer, Multi-point viscometer
Operate at a single rate of shear (Instruments used for determining viscosity)
Single point viscometer
Operate at a variety of shear (Instruments used for determining viscosity)
Multi-point viscometer
Type of single point viscometer that is based on the rate of flow of liquid through an orifice
Capillary viscometer
2 examples of capillary viscometer (SO)
Saybolt viscometer, Ostwald viscometer
2 types of multi-point viscometer (CC)
Cup & Bob, Cone & Plate
Type of multi-point viscometer based on the resistance to rotation of metallic body in contact with or immersed in the liquid
Cup & Bob
Type of multi-point viscometer based on the resistance to rotation of a metal cone in content with liquid in stationary phase
Cone & Plate
Example of Cup & Bob viscometer; the cup is stationary and the bob/rotator is revolving
Stormer viscometer
Example of Cone & Plate viscometer
Ferrati Shirley viscometer
Refers to the ratio of density and time of sample over density and time of water (Type of viscosity)
Absolute viscosity
Refers to the number of times the sample is more viscous than the standard (Type of viscosity)
Relative viscosity
Type of viscometer used for light liquid
Ostwald viscometer
Refers to the time wherein the substrate are pumped out of the cell or the time required for the liquid to pass from mark A to mark B
Efflux time
