- Based on apparent viscosity vs. shear rate plots, some materials are classified as `shear-thickening' or as `shear-thinning'. Which of the following is shear-thinning ?
Newtonian
Bingham plastic
Pseudo plastic
Dilatant
- Would the b.p. model give a simple straight line on a log(ss) vs. log(sn) ?
The answer is NO. Look at the equation again:
SS = SS0 + V ×
SN
As you can see,the expression cannot be
Explicitly written in terms of log(sn).
However, log(ss-ss0) would be independent of sn.
-
Can the pressure drop of a fluid flowing through a line be used to determine viscosity ?
Of course it can. An example is the on-line monitoring of viscosity using pressure drop measured at two different sections of pipe; parameters like k and n in the power-law equation can thus be found. Related measurements make use of the power for pumping/agitation of liquids.
- The density of a fluid is affected by temperature. Is this also true of vicosity ?
The decrease of viscosity with increase in temperature is quite rapid;
This effect is generally more the larger the viscosity.
-
A rule of thumb is that denser fluids are more viscous. Based on your
Experience, would you say that this is true ?
No. A common example is mercury, which is not so viscous as, say,pitch.
-
The approximate viscosity of water at room temperature is:
0.001 cp
0.01 cp
0.1 cp
1.0 cp
The answer is 1 cp
That's all.
- Quit
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