This chapter presents characteristics of positive displacement pumps and centrifugal pumps. The effects of viscosity, specific gravity, and system resistance on performance are described. Flow from a positive displacement (PD) pump can be produced either through rotary or reciprocating action. Rotary ...
In very low specific speed range (n_(s) < 0.25), the efficiency of the centrifugal pump designed by the conventional method becomes remarkably low. Therefore, positive-displacement pumps have been widely used for long. However, the positive-displacement pumps remain associated with problems suc...
Performance of a variable-pitch worm (endless screw), like that of a positive-displacement pump operating with leaks (reverse flows), is analyzed. An examination has been made of the head characteristics of two modified versions of sectional variable-pitch worms: where one worm with a smaller ...
The main contents of this dissertation are shown as follows:① Based on the definition of suction capacity of positive displacement machine,the screw pump suction capacity calculation model has been set up. The impacts of screw speed, screw helix angle, the transmission medium, etc., on the ...
Research Status, Critical Technologies, and Development Trends of Hydraulic Pressure Pulsation Attenuator Hydraulic pumps are a positive displacement pump whose working principle causes inherent output flow pulsation.Flow pulsation produces pressure pulsation w... Y Wang,T Shen,C Tan,... - 《Chinese Jo...
By a combined analysis of data in Table 1, Table 3, one can reach a positive correlation between permeability and throat-radius characteristics: The higher permeability is associated with a higher throat radius and a wider throat-radius distribution. Table 3. Summary of pore-throat characteristic ...
apositive displacement pump, an electric pump for engine 容积式泵浦,一个电泵浦为引擎[translate] aJohn Laurinitis 约翰Laurinitis[translate] a一个永不背叛的女孩 Never betrays girl[translate] abut most of all love give you memories you could never forget! 正在翻译,请等待... ...
Figure 38. The electrical axis of the heart (heart axis). As evident from the figure, the normal heart axis is between –30° and 90°. If the axis is more positive than 90° it is referred to as right axis deviation. If the axis is more negative than –30° it is referred to ...
26 investigated the relationship between the deformation of crushed gangue and the stress level and gradation characteristics through lateral compression tests. The research findings indicate that the stress of crushed gangue exhibits exponential growth with increasing strain, and there is a positive ...
In one embodiment, a positive displacement pump is in communication with the controller and is adjusted to vary the fluid flow rate through the orifice in a programmed sequence, representing a range of fluid velocities through the orifice. The microcontroller receives the vibration data from the sen...