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Thoma's cavitation factor Formula

GoThoma's Cavitation factor given Net Positive Suction Head Formula

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Thoma's Cavitation Factor is used to indicate the onset of cavitation. Check FAQs

σ = \frac{H a - h s - H v}{H m}

σ - Thoma's Cavitation Factor?H_a - Atmospheric Pressure Head for Pump?h_s - Suction Head of Centrifugal Pump?H_v - Vapour Pressure Head?H_m - Manometric Head of Centrifugal Pump?

Thoma's cavitation factor Example

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Here is how the Thoma's cavitation factor equation looks like with Values.

Here is how the Thoma's cavitation factor equation looks like with Units.

Here is how the Thoma's cavitation factor equation looks like.

0.7589 = \frac{28.7 - 7.3 - 2.2}{25.3}

0.7589 = \frac{28.7m - 7.3m - 2.2m}{25.3m}

0.7589 = \frac{28.7 - 7.3 - 2.2}{25.3}

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Thoma's cavitation factor Solution

Follow our step by step solution on how to calculate Thoma's cavitation factor?

FIRST Step Consider the formula

σ = \frac{H a - h s - H v}{H m}

Next Step Substitute values of Variables

∴

σ = \frac{28.7m - 7.3m - 2.2m}{25.3m}

Next Step Prepare to Evaluate

∴

σ = \frac{28.7 - 7.3 - 2.2}{25.3}

Next Step Evaluate

∴

σ = 0.758893280632411

LAST Step Rounding Answer

∴

σ = 0.7589

Thoma's cavitation factor Formula Elements

Variables

Thoma's Cavitation Factor

Thoma's Cavitation Factor is used to indicate the onset of cavitation.

Symbol: σ

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Thoma's Cavitation Factor

Atmospheric Pressure Head for Pump

The Atmospheric Pressure Head for Pump is the height of a liquid column that corresponds to the atmospheric pressure.

Symbol: H_a

Measurement: LengthUnit: m

Note: Value should be greater than 0.

Formulas to find Atmospheric Pressure Head for Pump

Suction Head of Centrifugal Pump

Suction head of centrifugal pump is the vertical height of the center line of the pump shaft above the liquid surface in the sump from which the liquid is being raised.

Symbol: h_s

Measurement: LengthUnit: m

Note: Value should be greater than 0.

Formulas to find Suction Head of Centrifugal Pump

Vapour Pressure Head

The Vapour Pressure Head is the head corresponding to the vapour pressure of the liquid.

Symbol: H_v

Measurement: LengthUnit: m

Note: Value should be greater than 0.

Formulas to find Vapour Pressure Head

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

Other Formulas to find Thoma's Cavitation Factor

Go Thoma's Cavitation factor given Net Positive Suction Head

σ = \frac{H sv}{H m}

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 Thoma's cavitation factor?

Thoma's cavitation factor evaluator uses Thoma's Cavitation Factor = (Atmospheric Pressure Head for Pump-Suction Head of Centrifugal Pump-Vapour Pressure Head)/Manometric Head of Centrifugal Pump to evaluate the Thoma's Cavitation Factor, Thoma's cavitation factor formula is defined as a dimensionless parameter that characterizes the cavitation phenomenon in centrifugal pumps, providing a measure of the pump's susceptibility to cavitation based on its geometric and flow parameters. Thoma's Cavitation Factor is denoted by σ symbol.

How to evaluate Thoma's cavitation factor using this online evaluator? To use this online evaluator for Thoma's cavitation factor, enter Atmospheric Pressure Head for Pump (H_a), Suction Head of Centrifugal Pump (h_s), Vapour Pressure Head (H_v) & Manometric Head of Centrifugal Pump (H_m) and hit the calculate button.

FAQs on Thoma's cavitation factor

What is the formula to find Thoma's cavitation factor?

The formula of Thoma's cavitation factor is expressed as Thoma's Cavitation Factor = (Atmospheric Pressure Head for Pump-Suction Head of Centrifugal Pump-Vapour Pressure Head)/Manometric Head of Centrifugal Pump. Here is an example- 0.758893 = (28.7-7.3-2.2)/25.3.

How to calculate Thoma's cavitation factor?

With Atmospheric Pressure Head for Pump (H_a), Suction Head of Centrifugal Pump (h_s), Vapour Pressure Head (H_v) & Manometric Head of Centrifugal Pump (H_m) we can find Thoma's cavitation factor using the formula - Thoma's Cavitation Factor = (Atmospheric Pressure Head for Pump-Suction Head of Centrifugal Pump-Vapour Pressure Head)/Manometric Head of Centrifugal Pump.

What are the other ways to Calculate Thoma's Cavitation Factor?

Here are the different ways to Calculate Thoma's Cavitation Factor-

Thoma's Cavitation Factor=Net Positive Suction Head of Centrifugal Pump/Manometric Head of Centrifugal Pump

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: Unit

Thoma's cavitation factor Formula

​GoThoma's Cavitation factor given Net Positive Suction Head Formula

Thoma's cavitation factor Example

Thoma's cavitation factor Solution

Thoma's cavitation factor Formula Elements

Other Formulas to find Thoma's Cavitation Factor

Other formulas in Geometric and Flow Parameters category

How to Evaluate Thoma's cavitation factor?

FAQs on Thoma's cavitation factor

Variable Name

GoThoma's Cavitation factor given Net Positive Suction Head Formula