Changes in the outlet pressure and head of a centrifugal pump after changes in medium density
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I would like to ask everyone: for a centrifugal pump with a capacity of 100 m3/h and a head of 100 meters, when the fluid being pumped is not water but oil with a density of 800 kg/m3, and the inlet pressure is 0.1 Mpa, will the pressure be 1.1 Mpa when using oil as the fluid? In other words, how do the head and outlet pressure change when the density of the pump changes? ? Please provide the source of the information, thank you.
This post was last edited by zxm2011831 on 2015-7-25 at 14:41. The head remains constant; when the density increases, the outlet pressure increases, and when the density decreases, the outlet pressure decreases. Based on the pump’s characteristic curve, the Bernoulli equation
Regardless of the density of the medium being pumped, the head output of the same pump remains constant; however, the size of the motor required varies. The higher the density of the medium, the greater the power capacity of the motor needed.
The head remains constant, with an outlet pressure of 0.88 MPa
It is understood that the head of a pump refers to the pressure difference between its inlet and outlet; if the head remains constant, then this pressure difference also stays constant. The power supplied to the pump is sufficient to create such a large pressure difference, so I believe that the outlet pressure of the pump will remain unchanged.
It is understood that the head of a pump refers to the pressure difference between its inlet and outlet; if the head remains constant, then this pressure difference also stays constant. The power supplied to the pump is sufficient to create such a large pressure difference, so I believe that the outlet pressure of the pump will remain unchanged.
It is understood that the head of a pump refers to the pressure difference between its inlet and outlet; if the head remains constant, then this pressure difference also stays constant. The power supplied to the pump is sufficient to create such a large pressure difference, so I believe that the outlet pressure of the pump will remain unchanged.
Dear teachers, could you provide theoretical derivations or evidence to prove that the head will not change?
Head and pressure difference are two different things; pressure difference is related to density. The head is not turned off. The specific derivation depends on the principle of centrifugal pumps; it’s all explained in textbooks, and the derivation is quite complicated.
Head is the increase in energy per unit weight of liquid pumped by the pump, from the inlet to the outlet of the pump – that is, the useful energy. The pressure difference between the inlet and outlet also represents an increase in energy; it is this pressure difference that is used to calculate the resistance that the system must overcome, as the resistance associated with equipment is generally expressed in pressure units, rather than in terms of head in meters.
The head of a centrifugal pump, also known as the pump’s pressure head, refers to the energy gained by unit weight of fluid through the pump. If your motor remains unchanged, then this energy will not change.