Thixotropy Formula Explained
Thixotropy describes how a fluid's plastic viscosity decreases over time when subjected to constant shear stress. The Thixotropy coefficient, denoted by B, quantifies this time-dependent property.
Calculating Thixotropy Coefficient (B)
The coefficient B is determined by the difference in plastic viscosity at two different times of shearing at a constant rate. Specifically, it relates the change in viscosity to the change in the logarithm of shearing time.
The standard expression for Thixotropy (B) is:
$B = \frac{U_1 - U_2}{\ln(t_2 / t_1)}$
Where:
- B represents the Thixotropy coefficient.
- U1 is the plastic viscosity after shearing for time t1.
- U2 is the plastic viscosity after shearing for time t2.
- t1 is the initial shearing time.
- t2 is the subsequent shearing time.
This formula accurately captures the relationship where a greater reduction in viscosity (U1 - U2) over the specified logarithmic time interval (ln(t2 / t1)) signifies higher thixotropic behavior.
Similar Questions
- What is the molar ratio [salt]/[acid] required to prepare an acetate buffer of pH 5.0 (pKa=4.76)?
- The falling sphere viscometer is also known as:
- In an o/w emulsion, mineral oil (specific gravity – 0.9) dispersed in aqueous phase having specific gravity of 1.05. If oil particles have average diameter of 5 micrometer, the external phase has viscosity of 0.5 poise and gravity constant is $981 \text{ cm/sec}^2$, What is the velocity of creaming in cm/day?
- The correct expression for Langmuir isotherm is (given Y- mass of gas adsorbed per gram of adsorbent, p is pressure)
- Particle surface area can be determined by:
- If coarse powder is having size 1, then very fine powder will have size:
- Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: Compression distillation is conducted at high pressure and temperature.
Reason R: It produces pyrogen free water hence popular in pharmaceutical industries.
In the light of the above statements, choose the most appropriate answer from the options given below - Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: The small engraved area in letter like 'A', 'B' and 'O' are difficult to tablet manufacture cleanly
Reason R: Because tablet punches having engraving exhibit picking problem in compression.
In the light of the above statements, choose the most appropriate answer from the options given below - Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: At high electrolyte concentration, dispersed systems becomes coagulated
Reason R: Repulsive forces among particles are greatly reduced.
In the light of the above statements, choose the most appropriate answer from the options given below - Sequence the parts of metering valve in aerosol package in proper order
A. Outlet valve seal
B. Capillary dip tube
C. Inlet valve seal
D. Two piece stainless steel stem
Choose the correct answer from the options given below:
Important Questions from Mixed Topic (CUET PG)
- Kalpsutra, the illustrated canonical text is from:-
- The Harappan city almost exclusively devoted to craft production was-:
- Mohandas Karamchand Gandhi launched quit India movement after the failure of:-
- The "Objectives Resolution" was introduced in constituent assembly by:-
- Who among the following was not a member of the constituent assembly:-
