Power Consumption and Pumping Rate

These basic characteristics of agitation systems are of paramount importance and have been investigated extensively. The literature is 

The combination of HP and rpm that corresponds to a particular superficial velocity depends on the size of the tank, the size of the impeller, and certain characteristics of the system. Tables 10.3, 10.4, and 10.5 are abbreviated combinations of horsepower and rpm that are suitable at particular pumping rates for the three main categories of mixing. More complete data may be found in the literature cited with the tables. 

For mixing of liquids, data are shown for a viscocity of 5000 cP, but data also have been developed for 25,000 cP, which allow for 

Impeller Size and Speed at a Specified Power Input 

For a vessel containing 5000 gal of liquid with specific gravity = 0.9 and viscosity of 100 cP, find size and speed of a pitched turbine impeller to deliver 2 HP/1000 gal. Check also the superficial linear velocity and the blend time. 

This value corresponds to moderate to high mixing intensity according to Table 10.2. 

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A low-pycnometer-density material allows the use of low-viscosity carrying fluids, leading to both lower power consumption and pumping rates during well injection. 

Typically, application of science involves prediction of function such as determining at what rate a well must be pumped to create a suitable capture zone. What period of time will be required to biodegrade a mass of contaminant within a plume How much activated carbon will be required to treat the discharged vapor What will be the cost of electricity to power the remediation system Engineers are more likely capable of designing a balanced remediation system that has flow rates matched to reaction times or water-air contact rates. Tank sizes, power consumption, and similar rate-time-related calculations also fall within the specialty of the engineer. 

Not only is the type of flow related to the impeller Reynolds number, but also such process performance characteristics as mixing time, impeller pumping rate, impeller power consumption, and heat- and mass-transfer coefficients can be correlated with this dimensionless group. 

A screen changer is located between the extruder and die to remove any dirt or foreign particles. Gear pumps located between the extruder and die reduce power consumption and provide a more uniform rate of polymer delivery to the die, providing improved gauge control [3]. 

CHARACTERISTIC CURVES HEAD-CAPACITY RELATION. The plots of actual head, total power consumption, and efficiency vs. volumetric flow rate are called the characteristic curves of a pump. Such curves are illustrated schematically in Fig. 8.12. In Fig. 8,12a, the theoretical head-flow rate (often called head-capacity) relation is a straight line, in accordance with Eq. f8.21) the actual developed head is considerably less and drops precipitously to zero as the rate increases to a certain value in any given pump. This is known as the zero-head flow rate it is the maximum flow the pump can deliver under any conditions. The rated or optimum operating flow rate is, of course, less than this. 

Helium loop pressures are shown in Figure 7. Pressure is to a first order proportional to hydrogen production rate, a consequence of inventory control. The production and consumption of power by major system components is shown in Figure 8. Essentially all the thermal power produced by the NGNP is consumed by thermal loads in the HTE plant and in generating electricity to power electrical loads which include the electrolyser and pumps and compressors. 

Figure 7 shows the process heat loop for transporting heat from the cold side of the PCU boiler to the hot side of the HTE boiler. This loop operates as a heat pump transferring heat from a cold source to a hot sink. Heat transfer with phase change is used at both the source and sink to achieve high heat fluxes and, hence, compact heat exchangers. An important question is the mechanical power consumption of the compressor and how it compares to the overall heat transfer rate. The compressor serves to... 

Their pumping mechanism is the roller peristaltic action which is also used for flow control. But the power consumption is high and the battery in some of these pumps needs to be replaced practically every day (6). The clinical infusion devices aforementioned are much too expensive for research purposes in laboratory animals, which are used because their inbreeding helps to avoid variations in pharmacological action due to genetic factors. Thus, there is a need to devise a simple and low cost infusion pump that can readily be modified in size or flow rate to accommodate different research requirements. 

Fluid Shear Rates, Impeller Pumping Capacity and Power Consumption... 

Fluid Shear Rates, Impeller Pumping Capacity and Power Consumption 689 h = r X (mv) [kgrti /s) (7-8)... 

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