Rod Climbing of TBP-Based PBMA and PSBMA Solutions (PBMA-350, PBMA-750, PSBMA-350, PSBMA-700)

Daniel D. Joseph
University of Minnesota, August 2005


Four different TBP-based non-Newtonian solutions were tested in the rod climbing experiments. These solutions were produced by mixing TBP (Tributyl Phosphate) and PBMA (Polybutyl Methacrylate) or PSBMA (Polystyrene-butyl Methacrylate) with specified concentrations by weight. The properties of liquids are shown in table-1.

Solution

Density

Surface Tension

Shear Viscosity at 1.74 shear

Weight Concentration

Note

 

(g/cm3)

(dyn/cm)

(cp)

%

 

PBMA/TBP-350

0.971

27.6

350

2.56

Mixed 5-12-05

PSBMA/TBP-350

0.974

27.8

350

2.60

Mixed 5-12-05

PBMA/TBP-750

0.992

25.6

750

3.20

Mixed 7-21-04

PSBMA/TBP-700

0.974

26.2

700

3.10

Mixed 5-11-05

Table 1. Properties of experimental liquids

 


(a) (e)


(b) (f)


(c) (g)


(d) (h)

Fig. 1 Change in free surface of PBMA/TBP-750 near a steel rod (diameter cm) as rotational speed is increased; room temperature C.

(a) (b) (c) (d) (e) (f) (g) (h)
Speed (rev/s) 0.0 4.2 6.7 10.0 13.3 20.0 30.0 41.7

 


(a) (e)


(b) (f)


(c) (g)


(d) (h)

Fig. 2 Change in free surface of PSBMA/TBP-700 near a steel rod (diameter cm) as rotational speed is increased; room temperature C.

(a) (b) (c) (d) (e) (f) (g) (h)
Speed (rev/s) 0.0 4.2 6.7 10.0 13.3 20.0 30.0 41.7

 


(a) (e)


(b) (f)


(c) (g)


(d) (h)

Fig. 3 Change in free surface of PBMA/TBP-350 near a steel rod (diameter cm) as rotational speed is increased; room temperature C.

(a) (b) (c) (d) (e) (f) (g) (h)
Speed (rev/s) 0.0 8.3 13.3 20.0 25.0 36.7 50.0 65.8

 


(a) (c)


(b) (d)

Fig. 4 Change in free surface of PSBMA/TBP-350 near a steel rod (diameter cm) as rotational speed is increased; room temperature C.

(a) (b) (c) (d)
Speed (rev/s) 0.0 8.3 16.7 65.8

 

A summary of the climbing constants for the TBP-based liquids is shown in table 2.

Solution

h0(a)

h2(a) for W0

Climbing constant

-

cm

cm.sec2

g/cm

PBMA/TBP-350

0.13850

0.00070

2.23

PBMA/TBP-750

0.11491

0.00234

7.30

PSBMA/TBP-350

0.11202

0.00042

1.35

PSBMA/TBP-700

0.16727

0.00189

5.89

Table 2. Measured values of climbing constants (the radius of rod a = 0.12 cm)


Last Modified: Thursday, 11-Aug-2005 12:44:20 CDT
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