Method and device for simultaneous determination of shear viscosity and extensional viscosity

An apparatus for continuous or discontinuous measurement of shear and extensional viscosities of Newtonian and non-Newtonian liquids and of structurally viscous liquids, polymer melts, elastomers solutions and other structural liquids, the apparatus comprising:

• a first capillary member having a first pitch defining a cross section which continuously widens in a flow direction;
• a second capillary member, disposed downstream of said first capillary member, said second capillary member having a second pitch defining a cross section which continuously narrows in said flow direction, said second pitch differing from said first pitch;
• a first pressure sensor disposed at said first capillary member;
• a second pressure sensor disposed at said first capillary member downstream of said first pressure sensor;
• a third pressure sensor disposed at said second capillary member;
• and
• a fourth pressure sensor disposed at said second capillary member downstream of said third pressure sensor.

An apparatus for continuous or discontinuous measurement of shear and extensional viscosities of Newtonian and non-Newtonian liquids and of structurally viscous liquids, polymer melts, elastomers solutions and other structural liquids, the apparatus comprising:

• a first capillary member having a cross section which continuously narrows in a flow direction;
• a second capillary member, disposed downstream of said first capillary member, said second capillary member having a cross section which continuously widens in said flow direction;
• a first pressure sensor disposed at said first capillary member;
• a second pressure sensor disposed at said first capillary member downstream of said first pressure sensor;
• a third pressure sensor disposed at said second capillary member;
• a fourth pressure sensor disposed at said second capillary member downstream of said third pressure sensor;
• and
• a dosing pump for transporting liquid out of an external system with one of an adjustable volume flow and an adjustable pressure and through said first and said second capillary members, wherein the liquid is expelled after passing through said first and said second capillary members.

An apparatus for continuous or discontinuous measurement of shear and extensional viscosities of Newtonian and non-Newtonian liquids and of structurally viscous liquids, polymer melts, elastomers solutions and other structural liquids, the apparatus comprising:

• a first capillary member having a cross section which continuously narrows in a flow direction;
• a second capillary member, disposed downstream of said first capillary member, said second capillary member having a cross section which continuously widens in said flow direction;
• a first pressure sensor disposed at said first capillary member;
• a second pressure sensor disposed at said first capillary member downstream of said first pressure sensor;
• a third pressure sensor disposed at said second capillary member;
• a fourth pressure sensor disposed at said second capillary member downstream of said third pressure sensor;
• a dosing pump to transport the liquid with one of adjustable volume flow and adjustable pressure, out of an external system and through said first and second capillary members;
• and
• a second pump disposed at an output of said first and said second capillary members to transport the liquid back into the external system.

An apparatus for continuous or discontinuous measurement of shear and extensional viscosities of Newtonian and non-Newtonian liquids and of structurally viscous liquids, polymer melts, elastomers solutions and other structural liquids, the apparatus comprising:

• a first capillary member having a cross section which continuously narrows in a flow direction;
• a second capillary member, disposed downstream of said first capillary member, said second capillary member having a cross section which continuously widens in said flow direction;
• a first pressure sensor disposed at said first capillary member;
• a second pressure sensor disposed at said first capillary member downstream of said first pressure sensor;
• a third pressure sensor disposed at said second capillary member;
• a fourth pressure sensor disposed at said second capillary member downstream of said third pressure sensor;
• and
• an additional pressure sensor disposed at one of said first and said second capillary members downstream of one of said second and said fourth pressure sensors.

An apparatus for continuous or discontinuous measurement of shear and extensional viscosities of Newtonian and non-Newtonian liquids and of structurally viscous liquids, polymer melts, elastomers solutions and other structural liquids, the apparatus comprising:

• a first capillary member consisting essentially of a first partial capillary having a first constant cross section and a second partial capillary disposed downstream of said first partial capillary and having a second constant cross section;
• a connecting member disposed between said first and said second capillaries and forming a second capillary member having a cross section which continuously changes from said first constant cross section to said second constant cross section;
• a first pressure sensor disposed at said first partial capillary;
• a second pressure sensor disposed at said first partial capillary member downstream of said first pressure sensor;
• a third pressure sensor disposed at said second partial capillary;
• a fourth pressure sensor disposed at said second partial capillary downstream of said third pressure sensor;
• and
• a dosing pump for transporting liquid out of an external system with one of an adjustable volume flow and an adjustable pressure and through said first and said second capillary members, wherein the liquid is expelled after passing through said first and said second capillary members.

An apparatus for continuous or discontinuous measurement of shear and extensional viscosities of Newtonian and non-Newtonian liquids and of structurally viscous liquids, polymer melts, elastomers solutions and other structural liquids, the apparatus comprising:

• a first capillary member consisting essentially of a first partial capillary having a first constant cross section and a second partial capillary disposed downstream of said first partial capillary and having a second constant cross section;
• a connecting member disposed between said first and said second capillaries and forming a second capillary member having a cross section which continuously changes from said first constant cross section to said second constant cross section;
• a first pressure sensor disposed at said first partial capillary;
• a second pressure sensor disposed at said first partial capillary member downstream of said first pressure sensor;
• a third pressure sensor disposed at said second partial capillary;
• a fourth pressure sensor disposed at said second partial capillary downstream of said third pressure sensor;
• a dosing pump to transport the liquid with one of adjustable volume flow and adjustable pressure out of an external system and through said first and said second capillary members;
• and
• a second pump disposed at an output of said first and said second capillary members to transport the liquid back into the external system.