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Flow ratio Formula

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Flow ratio centrifugal pump is the ratio of the velocity of flow at the exit to the theoretical velocity of the jet corresponding manometric head. Check FAQs

K f = \frac{V f2}{\sqrt{2 \cdot [g] \cdot H m}}

K_f - Flow Ratio Centrifugal Pump?V_f2 - Flow Velocity at Outlet of Centrifugal Pump?H_m - Manometric Head of Centrifugal Pump?[g] - Gravitational acceleration on Earth?

Flow ratio Example

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Here is how the Flow ratio equation looks like with Values.

Here is how the Flow ratio equation looks like with Units.

Here is how the Flow ratio equation looks like.

0.0952 = \frac{2.12}{\sqrt{2 \cdot 9.8066 \cdot 25.3}}

0.0952 = \frac{2.12m/s}{\sqrt{2 \cdot 9.8066m/s² \cdot 25.3m}}

0.0952 = \frac{2.12}{\sqrt{2 \cdot 9.8066 \cdot 25.3}}

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Flow ratio Solution

Follow our step by step solution on how to calculate Flow ratio?

FIRST Step Consider the formula

K f = \frac{V f2}{\sqrt{2 \cdot [g] \cdot H m}}

Next Step Substitute values of Variables

∴

K f = \frac{2.12m/s}{\sqrt{2 \cdot [g] \cdot 25.3m}}

Next Step Substitute values of Constants

∴

K f = \frac{2.12m/s}{\sqrt{2 \cdot 9.8066m/s² \cdot 25.3m}}

Next Step Prepare to Evaluate

∴

K f = \frac{2.12}{\sqrt{2 \cdot 9.8066 \cdot 25.3}}

Next Step Evaluate

∴

K f = 0.0951700428213033

LAST Step Rounding Answer

∴

K f = 0.0952

Flow ratio Formula Elements

Variables

Constants

Functions

Flow Ratio Centrifugal Pump

Flow ratio centrifugal pump is the ratio of the velocity of flow at the exit to the theoretical velocity of the jet corresponding manometric head.

Symbol: K_f

Measurement: NAUnit: Unitless

Note: Value should be less than 1.

Formulas to find Flow Ratio Centrifugal Pump

Flow Velocity at Outlet of Centrifugal Pump

Flow velocity at outlet of centrifugal pump is the velocity of the fluid at the outlet of the impeller or the centrifugal pump.

Symbol: V_f2

Measurement: SpeedUnit: m/s

Note: Value should be greater than 0.

Formulas to find Flow Velocity at Outlet of Centrifugal Pump

Manometric Head of Centrifugal Pump

The Manometric Head of Centrifugal Pump is the head against which the centrifugal pump has to work.

Symbol: H_m

Measurement: LengthUnit: m

Note: Value should be greater than 0.

Formulas to find Manometric Head of Centrifugal Pump

Gravitational acceleration on Earth

Gravitational acceleration on Earth means that the velocity of an object in free fall will increase by 9.8 m/s2 every second.

Symbol: [g]

Value: 9.80665 m/s²

sqrt

A square root function is a function that takes a non-negative number as an input and returns the square root of the given input number.

Syntax: sqrt(Number)

Other formulas in Geometric and Flow Parameters category

Go Speed ratio

K u = \frac{u 2}{\sqrt{2 \cdot [g] \cdot H m}}

Go Volume of liquid at inlet

Q = π \cdot D 1 \cdot B 1 \cdot V f1

Go Weight of liquid

W l = y \cdot Q

Go Static head

H st = h s + h d

How to Evaluate Flow ratio?

Flow ratio evaluator uses Flow Ratio Centrifugal Pump = Flow Velocity at Outlet of Centrifugal Pump/sqrt(2*[g]*Manometric Head of Centrifugal Pump) to evaluate the Flow Ratio Centrifugal Pump, Flow ratio formula is defined as a dimensionless quantity that characterizes the flow behavior in a centrifugal pump, providing a relationship between the volumetric flow rate and the geometric parameters of the pump, allowing for the optimization of pump design and performance. Flow Ratio Centrifugal Pump is denoted by K_f symbol.

How to evaluate Flow ratio using this online evaluator? To use this online evaluator for Flow ratio, enter Flow Velocity at Outlet of Centrifugal Pump (V_f2) & Manometric Head of Centrifugal Pump (H_m) and hit the calculate button.

FAQs on Flow ratio

What is the formula to find Flow ratio?

The formula of Flow ratio is expressed as Flow Ratio Centrifugal Pump = Flow Velocity at Outlet of Centrifugal Pump/sqrt(2*[g]*Manometric Head of Centrifugal Pump). Here is an example- 0.09517 = 2.12/sqrt(2*[g]*25.3).

How to calculate Flow ratio?

With Flow Velocity at Outlet of Centrifugal Pump (V_f2) & Manometric Head of Centrifugal Pump (H_m) we can find Flow ratio using the formula - Flow Ratio Centrifugal Pump = Flow Velocity at Outlet of Centrifugal Pump/sqrt(2*[g]*Manometric Head of Centrifugal Pump). This formula also uses Gravitational acceleration on Earth constant(s) and Square Root (sqrt) function(s).

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