Posts filled under #laz

Birlik beraberligimizi bo

Birlik beraberligimizi bozamayanlar #dunya ile bizi terorun teslimiyetine girmis #guvensiz ve #ozgur bir #ulke olmaktan uzaklasan yasama hakkinin guvenceye alinamamis #ayrismis bir #toplum olarak gostermeye calisiyorlar guclu durusumus sukunetimiz ve #1923 #ruhuyla yasayan #Turk #slam #birligi icerisinde yasayan #kurt turk #arap #laz #cerkez #alevi #sunni #sii olarak tek bayrak altinda birlesmis olan sanli #milletimizin kardesligini bozamadiklari icin #rusya #turkiye arasinda #gerilim yaratarak bu hedefine ulasmak istiyorlar ama bilmedikleri birset varki bizim #baris icinde #yasama ve i#nsanlik #ruhumuz var ve bu herseyin ustesinden gelmemize yetecektir ..

An extract on #laz

Plunger pumps are reciprocating positive displacement pumps. These consist of a cylinder with a reciprocating plunger. The suction and discharge valves are mounted in the head of the cylinder. In the suction stroke the plunger retracts and the suction valves open causing suction of fluid into the cylinder. In the forward stroke the plunger pushes the liquid out of the discharge valve. Efficiency and common problems: With only one cylinder in plunger pumps, the fluid flow varies between maximum flow when the plunger moves through the middle positions, and zero flow when the plunger is at the end positions. A lot of energy is wasted when the fluid is accelerated in the piping system. Vibration and water hammer may be a serious problem. In general the problems are compensated for by using two or more cylinders not working in phase with each other.

Rotodynamic pumps (or dynamic pumps) are a type of velocity pump in which kinetic energy is added to the fluid by increasing the flow velocity. This increase in energy is converted to a gain in potential energy (pressure) when the velocity is reduced prior to or as the flow exits the pump into the discharge pipe. This conversion of kinetic energy to pressure is explained by the First law of thermodynamics, or more specifically by Bernoulli's principle. Dynamic pumps can be further subdivided according to the means in which the velocity gain is achieved. These types of pumps have a number of characteristics: Continuous energy Conversion of added energy to increase in kinetic energy (increase in velocity) Conversion of increased velocity (kinetic energy) to an increase in pressure head A practical difference between dynamic and positive displacement pumps is how they operate under closed valve conditions. Positive displacement pumps physically displace fluid, so closing a valve downstream of a positive displacement pump produces a continual pressure build up that can cause mechanical failure of pipeline or pump. Dynamic pumps differ in that they can be safely operated under closed valve conditions (for short periods of time).

Valveless pumping assists in fluid transport in various biomedical and engineering systems. In a valveless pumping system, no valves (or physical occlusions) are present to regulate the flow direction. The fluid pumping efficiency of a valveless system, however, is not necessarily lower than that having valves. In fact, many fluid-dynamical systems in nature and engineering more or less rely upon valveless pumping to transport the working fluids therein. For instance, blood circulation in the cardiovascular system is maintained to some extent even when the hearts valves fail. Meanwhile, the embryonic vertebrate heart begins pumping blood long before the development of discernible chambers and valves. In microfluidics, valveless impedance pumps have been fabricated, and are expected to be particularly suitable for handling sensitive biofluids. Ink jet printers operating on the Piezoelectric transducer principle also use valveless pumping. The pump chamber is emptied through the printing jet due to reduced flow impedance in that direction and refilled by capillary action..