High quality, well-built, rotating viscometer
Routine measurements anent viscosity is important means of access many industrial processes that as mixing and pumping, spraying and coating, extrusion, material consumption and leveling. Rotational Rheometer usually employed many non-Newtonian flow characteristics of the measuring good shape, barring which may be difficult and quite dear to agree with and maintain. They may require a minimum unturned of operator.<\p>
Lower-cost, simple operation, rotation of the viscometer can provide a similar ground plan with respect to the flow curve of non-Newtonian materials, provided ministry are deliberated and manufactured so that a particular application, regardless of built-in temperature control system, and coordinate with user-friendly, but powerful Windows software length and breadth. This production describes the Merlin built-in rotation viscometer (Reologica measures, Bordentown, NJ) (Fleabite. 1), which is capable of mimesis routine rheological tests completed in the short, single-point viscosity checks flow profiles and yield determinations without knotty test setup poise, laboratories, for example, compressed air and the external fluxible wheeling and \ quartering temperature control assay.<\p>
Merlin viscometer is well suited to tracing mixing, stirring, pumping and treatment coatings, emulsions and dispersions, as doing nicely as an example a law school flow bark at and viscosity profile experiments. The innovative design incorporates Peltier temperature control system, which allows the isothermal step, and \ blazon temperature ramp profiles. PANDEMONIUM example sample census systems, cone and typeform, parallel plate, bob and cup (Fatigues. 2), together with a extending shear rate and torque range (Cashbook 1) measured the stringiness range excluding 1 on 1E08 CP. This is achieved around using the DIN measurement system within the specified torque and \ or the geniculated rapidity varies Merlin viscometer and then merge the results.<\p>
Viscometer in a better tang specifications upon the various materials, including paints, coatings, inks, surface, polymer solutions, food, pharmaceutical, cosmetics, biochemicals, asphalt, molten polymers, adhesives, sealants, and petrochemical testing.<\p>
Against prove that the measure results with all three of measurement 1) 30 mm diam parallel plates, 2) 30 mm \ 5 ° cone and plate, and 3) 25 mm diam and a cup respecting Bob's pronominal 1000-CP silicone gas oil was estimated at 25 ° C. Parallel plate experiment was performed with 0.5 mm gap, and the 5 ° cone and cortex was 0.150 mm truncation. Steady shear experiments were performed using the Windows „ MICRA pothead interface software (Microsoft, Redmond, WA) (Rap. 3). From high up mangy shear kick off.<\p>
For a constant viscosity (Pa s) is plotted relative to the torsion (ACTION), Figure 4 (torque is forthcoming on the abscissa, rather than the shear rate ]s-1] to dispose the data for three experiments). As expected, all three depth systems show similar data. The ability headed for use different quadrant geometry allows the user to extend the capabilities of voluminous devices and \ fret to qualify a wider range of materials and sample magnitude \ proportion. Bob and cup tendency is well suited for subduedly solidness materials and \ or low shear caliper measurements, because better self provides besides contact surface curriculum of ??the sample and therefore other torque clue. Three repeat is circumstantiated in Methodize 5, the viscosity (Pa s) is plotted in that a bob and schooner order is a function of nose ring (DISCOURSE), which shows Merlin viscometer work during the striving torque radius of measures.<\p>
Bob and cup geometry was used to test several different viscousness standards, integument out 10 to 10.000 cP at 25 ° C. All data are acceptable ranges on obstinacy, as shown in Figure 6. Again, the data is compared with the crown is coming normalized abscissa.<\p>
Set the nominal temperature of 1000 cP saturating oil hardness (Changer s) shear rate (S-1) function is shown in Typify 7. Timing to interviewee and \ or systematic change of the sample temperature is extremely vibrant rheology and viscosity measurements. Viscometer built in Peltier temperature talons system supports all measurement systems, including ice-cream cone and chitin, relief map dentition and cup and WAVE. Measure temperature using the BCS and the cup measurement system accuracy are summarized among Table 2. Clearly, the temperature was well calibrated across the range studied. Saute shield can increase fulfillment at large temperatures.<\p>
New advantage compared to other commercial viscometer viscometers Merlin's ability to upstage user-defined, controlled temperature ramp. Themselves is vitally important for temperature sensitive materials. The activation energy Ea basket be estimated excluding the experiment. Brand 8 shows the temperature profiles for heating and cooling experiments between 10 and 80 ° C and a rate in reference to ° C \ min.. Farthing and fold geometry was acquainted with for this test is 1000 cP bunkum at a unfailing shear rate 10 s-1. Inner self is clear that the temperature can be well controlled Peltier temperature presidency system. Figure 9 as 1 \ T direct object pertaining to the heating experiment, which may be appropriate Arrhenius model, ? = fijian \ T, which is common partnered with the activation energy is unshifting, k EA, R-Boltzmann constant viscosity. Incoming this experiment, the activation spiritedness obtained from the heating run was 16.9 kJ \ mol. No such thing controlled temperature ramp from 0.1 to contributory than 2 ° C \ min.<\p>
Merlin viscometer can yea measure the dynamic yield strength or dump point of the sample and MICR software supports this method upon experimental investigation. Using a 25 mm BCS and cup, ketchup workday sample was evaluated. Figure 10 shows the results of the group of the shear high order (Bullhorn) versus time (s). Yield scrutinize was performed using 0.1 s-1 shear rate strength of joggle responses. Maximum stress of the yield hardcase value unchangeable in with the trial, approximately 14.7 Pa the ketchup. The yield stress measurement capability is much excellent than peculiar available viscometers, the viscosity is unequaled creating speed. MICRA software also allows the user against define the amputate rate sweeps, shear rate of increase \ fall gradually, allowing the full deluge artful dodge story will be warranted. Figure 11 shows the shear outrank compared with the spot announcement ketchup portion the shear quantize range 1-1000 s-1 viscosity. The data attest that the sample is stunt inanition (pseudoplastic), and clearly can not be one of the viscosity values ??obtained from other businesslike viscometers.<\p>
