ISBN-10: 0470935553
ISBN-13: 9780470935552
ISBN-10: 0816908362
ISBN-13: 9780816908363
The most recent variation of this industry-friendly consultant to comparing the functionality of combining gear brings this conventional technique operation into the twenty first century. The booklet starts off with easy definitions and phrases, and is going to element try making plans and tactics, and computation and evaluate of effects. Appendices provide a troubleshooting checklists, pattern log.Content:
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Extra info for Mixing Equipment (Impeller Type), Third Edition
Example text
3. The rate of flow of fluids is most often measured by differential pressure meters. Commonly used ones are orifice meters, venturi meters, flow nozzle meters, and pitot tube meters. 5 to 10 percent of full scale are common depending on the type of meter used. For additional information, see Ref. 3. Magnetic flow meters are suitable for liquids that have slight electrical conductivity. This style meter is reported to be particularly useful for measuring flow of liquids containing suspended solids.
0 Speed The speed of the mixer shaft can be measured by using a tachometer, a stroboscope, or by counting the low speed shaft rotations. Any device should have an accuracy of plus or minus 1 percent of this important measurement. Uncertainty in power will be less than plus or minus 3 percent with this accuracy. The use of nameplate motor speed and nominal gear ratio is not sufficiently accurate for speed determination. Motor slip and variance within nominal speed ratios, accepted by American Gear Manufacturers Association (AGMA) Standards, can contribute to significant errors compared with actual speed.
2 Power Number, Po = D , I gc p N 3 D’ where g, is the gravitational force constant, which converts from force to mass, for consistent units. The ratio of imposed forces to inertial forces, which relates power to impeller and fluid characteristics. 3 Pumping Number, Pu = Q N D3 The ratio of actual flow rate to a reference flow rate. 4 Froude Number, N ~ D Fr = g The ratio of inertial force to gravity force. 5 Aeration Number, Q, Ae = - N D3 where Qgis gas flow rate. The ratio of gas flow rate to a reference liquid flow rate.
Mixing Equipment (Impeller Type), Third Edition
by Daniel
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