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Why flow of centrifugal fans is not blocked at their discharge?
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Static force analysis on over head fan?
Centrifugal force of the fan results in an increase in static force. The blades of the axial flow fans force air to move parallel to them.
Purpose of minimum flow line for centrifugal pump?
Low flow can cause overheating, hydraulic instabilities (suction and discharge recirculation) and mechanical unreliability in centrifugal pumps. To prevent such problems, options include both continuous and automatic (active) low-flow protection systems. Figure 1 shows four major types of configurations that provide recirculation back to an upstream feed vessel. Alternatives include recirculation to the pump suction piping.
How do you differentiate between positive displacement pump and roto dynamic pump?
Gear pump is a positive displacement pump. (A positive displacement pump causes a fluid to move by trapping a fixed amount of it then forcing (displacing) that trapped volume into the discharge pipe. or A positive displacement pump has an expanding cavity on the suction side and a decreasing cavity on the discharge side. Liquid flows into the pump as the cavity on the suction side expands and the liquid flows out of the discharge as the cavity collapses. The volume is constant given each cycle of operation. A positive displacement pump can be further classified according to the mechanism used to move the fluid: a.Rotary-type, internal gear, screw, shuttle block, flexible vane or sliding vane, circumferential piston, helical twisted roots (e.g. the Wendelkolben pump) or liquid ring vacuum pumps. b.Reciprocating-type, for example, piston or diaphragm pumps. Gear pump is generally used for viscous fluid especially in hydraulic service. Gear pump are used for high head , low flow application. Widely used on car engine oil pumps. it is also used in various hydraulic power packs.. If you change the direction of gear pump ,suction will become discharge and discharge port become suction port. Gear pumps requires high degree of close clearances between gears and its housings. In centrifugal pump you will find above all in reverse . A centrifugal pump is a rotodynamic pump that uses a rotating impeller to increase the pressure and flow rate of a fluid. Centrifugal pumps are the most common type of pump used to move liquids through a piping system. The fluid enters the pump impeller along or near to the rotating axis and is accelerated by the impeller, flowing radially outward or axially into a diffuser or volute chamber, from where it exits into the downstream piping system. Centrifugal pumps are typically used for large discharge through smaller heads. Centrifugal pumps are most often associated with the radial flow type. However, the term "centrifugal pump" can be used to describe all impeller type rotodynamic pumps including the radial, axial and mixed flow variations. Gear pump is high efficiency pump while centrifugal pump will have relatively low efficiency.
What is surging in compressor?
Centrifugal and axial compressors will surge when forward flow through the compressor can no longer be maintained, due to an increase in pressure across the compressor, and a momentary flow reversal occurs. Once surge occurs, the reversal of flow reduces the discharge pressure or increases the suction pressure, thus allowing forward flow to resume again until the pressure rise again reaches the surge point. This surge cycle will continue until some change is made in the process or compressor conditions.
Difference between single stage and multi stage centrifugal pump?
You should think of a multistage pump as a series of single stage pumps all mounted on one shaft with a single large case that holds all of them. As with all centrifugal pumps, the capacity of any single stage varies with the amount of head (discharge pressure) that stage develops. More head, less flow. Less head, more flow. In any case the single stage has a limited amount of head development at any given flow rate. To produce more head, multiple stages are operated in series so that each stage's head is added to that of the previous stage. Multistage pumps can be either horizontal or vertical in configuration.
What is the difference between axial in-line fans and centrifugal inline fans?
Axial fans are like a propeller - like most domestic fans. Centrifugal fans are like water or paddle wheeels that sit inside a case. Instead of water turning them, the wheel is driven by the motor and that moves the gas. In-line merely means that the fan sits in the gas flow.
Static force analysis on over head fan?
Centrifugal force of the fan results in an increase in static force. The blades of the axial flow fans force air to move parallel to them.
Purpose of minimum flow line for centrifugal pump?
Low flow can cause overheating, hydraulic instabilities (suction and discharge recirculation) and mechanical unreliability in centrifugal pumps. To prevent such problems, options include both continuous and automatic (active) low-flow protection systems. Figure 1 shows four major types of configurations that provide recirculation back to an upstream feed vessel. Alternatives include recirculation to the pump suction piping.
Why centrifugal pump is not called a positive displacement type of pump?
A positive displacement pump causes a fluid to move by trapping a fixed amount of it then forcing (displacing) that trapped volume into the discharge pipe. Centrifugal pumps impart pressure to the fluid, to cause a pressure differential and cause flow, but even if the outlet is sealed, the pump can continue to run because it hasn't trapped the fluid. When no flow is occurring, a centrifugal pump acts like a propeller spinning in the water. If flow is stopped on a line that a positive displacement pump is supplying flow to, the pump is forced to stop since the trapped fluid prevents it from moving any more fluid.
If you double the speed of centrifugal pump?
Centrifugal pumps generally obey what are known as the pump laws. These laws state that the flow rate or capacity is directly proportional to the pump speed; the discharge head is directly proportional to the square of the pump speed; and the power required by the pump motor is directly proportional to the cube of the pump speed.
What is the form of flow in volute casing after the impeller in centrifugal pump?
rotational
The frontal area of a centrifugal compressor as compared to axial flow compressor is larger or smaller?
the frontal area of a centrifugal compresor is more as compared to axial flow compressor for a given air flow. And for this reason axial compressors are being used in aircraft engines.
What is the difference of an axial flow and centrifugal compressor?
The centrifugal flow compressor has a single or two stage unit using an impeller. The axial flow compressor is a multi-stage unit using alternate rows of rotating (rotor) blades and stationary (stator) vanes.
What is the function of the impeller in a centrifugal pump?
Impeller make the flow has velocity in a centrifugal pump. The purpose of pump is increasing the pressure. The flow has velocity envergy via impeller and the energy change to pressure energy in diffuser.
What are characteristics of centrifugal pump?
centrifugal pump is that machine which converts the mechanical energy into pressure energy . 1. it produces th pressure energy by applying the centrifugal force. 2. flow in it is radial outward direction. 3.the pressure head at the outlet is more than the at inlet, so fluid can be lifted to very high .level 4.in case of centrifugal pump, discharge is proportional to speed in r.p.m power is proportional to ( speed in r.p.m)^3 head is proportional to ( speed in r. p.m)^2 5. it is subjected to cavitation.
Is the static discharge a flow of electrons?
Static discharge is the spark associated with static electricity that is caused by electrostatic discharge.
What happens to flow and pressure if the rotational speed of a centrifugal fan is doubled?
it gets faster
