Flow-rate testing

The Melt Flow Rate Test is a method used to characterise polymer melts. It is, in effect, a single point ram extruder test using standard testing conditions (BS... 

This is typically tested for at least two flow rates. Typical flow rates that are chosen are within a range from 0.2 to 3.0mL/min. The specific flow rates tested will depend on the operating range of the pump and may be influenced by the user s expected operating range. 

The experimental approach described earlier is validated by performing experiments at different liquid flow rates and void fractions. The liquid flow rates tested are 0.6,1.8, 2.8, 3.4, 4.5, 5.2, 6.2, and 7.5 m3/h. The void fraction a in the experiments is 0% (liquid phase only), 10%, 20%, 30%, 40%, and 50%. Here again the void fraction a is defined as... 

In Vivo Test of the Infusion Device. Before the infusion device was used to deliver micro-volume of a heparin solution, the amount of the anticoagulant required to delay the normal clotting time from 1.02 min to > 15 min was determined. An intraperitoneal silicone catheter was inserted by way of a trocar needle into an anesthetized Wistar rat, and the external catheter end was connected to the flow rate testing assembly. With a glass hollow fibre flow moderator having a flow rate of 50 plitre/hr at 48 kPa driving pressure, it was found to require about 25 IU/kg/hr to obtain a Lee-White... 

In order to assess the extrudability of a polymer two practical tests are applied the melt flow index test and the flow rate test at various pressures (and temperatures). 

Is There a Grit Build-up Problem Secondary Clarifier Blanket Depth Testing RAS Flow Rate Testing Mass Control Testing Settling Rate Testing... 

Melt fracture for highly filled composite materials has a more complex character compared to that of neat plastics. And this is, of course, due to the effect of the filler. For example, using a cone die (the entrance diameter 2.5 in., the exit diameter 0.300 in., the length of the die 12 in.) it was shown for the neat HDPE that there was no visual signs of extrudate distortion for any of the flow rate tested (5.5-177 g/min), unlike that for filled plastics. Similarly, the 10%-filled (ground rice hulls) HDPE did not exhibit any observable extrudate distortion. However, the 60% -filled composite... 

As indicated earlier, the polymer solution is ejected at the tip of the wing on the low pressure side of the foil through a small tube of about one millimeter diameter. For the ejection flow rates tested the jet velocity is therefore smaller than the mean axial velocity in the test section. It can be thus safely considered that the polymer solution is first confined within the vortex as a result of the vortex roll-up at the tip and next... 

ISO 4440-1 1994 Thermoplastics pipes and fittings - determination of melt-flow rate - test method. 

The reactor coolant pumps are sized to deliver flow that equals or exceeds the design flow rate utilized in the thermal hydraulic analysis of the Reactor Coolant System. Analysis of steady-state and anticipated transients is performed assuming the minimum design flow rate. Tests are performed to evaluate reactor coolant pump performance during the post-core load hot functional testing to verify adequate flow. 

OPERATING CONDITIONS. Ranges of liquid-hydrogen flow rates, test-section inlet pressures and electrical power inputs to the test section were investigated. 

Validation of the velocity of the exhausted air in the opening under the glass window and validation of the volume of the exhausted air (extract volume flow rate test). 

A picture of the pipe assembly used for FTS testing is shown in Figure 9.11. Two 5.08 cm (2 in.) OD screen samples were mounted inside the pipe assembly as shown. Pressure taps were mounted to measure the differential pressure across the screen as a function of flow rate. The second screen was spaced far enough from the first sample to minimize entrance effects at the highest flow rates tested, thus ensuring single phase liquid flow at each screen. The assembly was mounted from the top of the tank and so the flow was routed vertically upward. Both screens passed pre-test IPA bubble point tests to ensure that they were defect free. 

Figure 15.6 Free flowing powder during flow rate test.

Figure 15.7 Bulk-density cylinder of known volume (40 cm ) filled with powder during flow rate test.

Melt index (melt flow rate) test rheological tests... 

The molecular weights of the assembly materials were evaluated indirectly by melt flow rate. The melt flow rate testing was conducted in accordance with ASTM D 1238 -Procedure B, using a temperature of 190 °C and a constant load of 2.16 kg. 

---