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Enthalpy of evaporation given critical heat flux Formula

GoEnthalpy of evaporation to nucleate pool boiling Formula

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Change in Enthalpy of Vaporization is the amount of energy (enthalpy) that must be added to a liquid substance to transform a quantity of that substance into a gas. Check FAQs

∆H = \frac{Q c}{0.18 \cdot ρ v \cdot {(\frac{Y \cdot [g] \cdot (ρ l - ρ v)}{{ρ v}^{2}})}^{0.25}}

∆H - Change in Enthalpy of Vaporization?Q_c - Critical Heat Flux?ρ_v - Density of Vapour?Y - Surface Tension?ρ_l - Density of Liquid?[g] - Gravitational acceleration on Earth?

Enthalpy of evaporation given critical heat flux Example

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Here is how the Enthalpy of evaporation given critical heat flux equation looks like with Values.

Here is how the Enthalpy of evaporation given critical heat flux equation looks like with Units.

Here is how the Enthalpy of evaporation given critical heat flux equation looks like.

500 = \frac{332.8425}{0.18 \cdot 0.5 \cdot {(\frac{21.8 \cdot 9.8066 \cdot (4 - 0.5)}{{0.5}^{2}})}^{0.25}}

500J/mol = \frac{332.8425W/m²}{0.18 \cdot 0.5kg/m³ \cdot {(\frac{21.8N/m \cdot 9.8066m/s² \cdot (4kg/m³ - 0.5kg/m³)}{{0.5kg/m³}^{2}})}^{0.25}}

500 = \frac{332.8425}{0.18 \cdot 0.5 \cdot {(\frac{21.8 \cdot 9.8066 \cdot (4 - 0.5)}{{0.5}^{2}})}^{0.25}}

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Enthalpy of evaporation given critical heat flux Solution

Follow our step by step solution on how to calculate Enthalpy of evaporation given critical heat flux?

FIRST Step Consider the formula

∆H = \frac{Q c}{0.18 \cdot ρ v \cdot {(\frac{Y \cdot [g] \cdot (ρ l - ρ v)}{{ρ v}^{2}})}^{0.25}}

Next Step Substitute values of Variables

∴

∆H = \frac{332.8425W/m²}{0.18 \cdot 0.5kg/m³ \cdot {(\frac{21.8N/m \cdot [g] \cdot (4kg/m³ - 0.5kg/m³)}{{0.5kg/m³}^{2}})}^{0.25}}

Next Step Substitute values of Constants

∴

∆H = \frac{332.8425W/m²}{0.18 \cdot 0.5kg/m³ \cdot {(\frac{21.8N/m \cdot 9.8066m/s² \cdot (4kg/m³ - 0.5kg/m³)}{{0.5kg/m³}^{2}})}^{0.25}}

Next Step Prepare to Evaluate

∴

∆H = \frac{332.8425}{0.18 \cdot 0.5 \cdot {(\frac{21.8 \cdot 9.8066 \cdot (4 - 0.5)}{{0.5}^{2}})}^{0.25}}

Next Step Evaluate

∴

∆H = 500.000000000001J/mol

LAST Step Rounding Answer

∴

∆H = 500J/mol

Enthalpy of evaporation given critical heat flux Formula Elements

Variables

Constants

Change in Enthalpy of Vaporization

Change in Enthalpy of Vaporization is the amount of energy (enthalpy) that must be added to a liquid substance to transform a quantity of that substance into a gas.

Symbol: ∆H

Measurement: Energy Per MoleUnit: J/mol

Note: Value can be positive or negative.

Formulas to find Change in Enthalpy of Vaporization

Critical Heat Flux

Critical Heat Flux is the heat transfer rate per unit area normal to the direction of heat flow. It is denoted by the letter "q".

Symbol: Q_c

Measurement: Heat Flux DensityUnit: W/m²

Note: Value can be positive or negative.

Formulas to find Critical Heat Flux

Density of Vapour

The Density of Vapour is the mass of a unit volume of a material substance.

Symbol: ρ_v

Measurement: DensityUnit: kg/m³

Note: Value should be greater than 0.

Formulas to find Density of Vapour

Surface Tension

Surface Tension is the surface of a liquid that allows it to resist an external force, due to the cohesive nature of its molecules.

Symbol: Y

Measurement: Surface TensionUnit: N/m

Note: Value should be greater than 0.

Formulas to find Surface Tension

Density of Liquid

Density of Liquid is mass of a unit volume of a material substance.

Symbol: ρ_l

Measurement: DensityUnit: kg/m³

Note: Value should be greater than 0.

Formulas to find Density of Liquid

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

Other Formulas to find Change in Enthalpy of Vaporization

Go Enthalpy of evaporation to nucleate pool boiling

∆H = {((\frac{1}{Q}) \cdot μ f \cdot {(\frac{[g] \cdot (ρ l - ρ v)}{Y})}^{0.5} \cdot {(\frac{C l \cdot ΔT}{C s \cdot {(Pr)}^{1.7}})}^{3})}^{0.5}

Other formulas in Boiling category

Go Heat flux to nucleate pool boiling

Q = μ f \cdot ∆H \cdot {(\frac{[g] \cdot (ρ l - ρ v)}{Y})}^{0.5} \cdot {(\frac{C l \cdot ΔT}{C s \cdot ∆H \cdot {(Pr)}^{1.7}})}^{3.0}

Go Critical heat flux to nucleate pool boiling

Q c = 0.18 \cdot ∆H \cdot ρ v \cdot {(\frac{Y \cdot [g] \cdot (ρ l - ρ v)}{{ρ v}^{2}})}^{0.25}

Go Maximum heat flux to nucleate pool boiling

Q m = (1.464 \cdot 10^{- 9}) \cdot {(\frac{C l \cdot {k l}^{2} \cdot {ρ l}^{0.5} \cdot (ρ l - ρ v)}{ρ v \cdot ∆H \cdot {μ f}^{0.5}})}^{0.5} \cdot {(\frac{∆H \cdot ρ v \cdot ΔT}{Y \cdot T f})}^{2.3}

Go Heat transfer coefficient by convection for stable film boiling

h c = 0.62 \cdot {(\frac{{k v}^{3} \cdot ρ v \cdot [g] \cdot (ρ l - ρ v) \cdot (∆H + (0.68 \cdot C v) \cdot ΔT)}{μ v \cdot D \cdot ΔT})}^{0.25}

How to Evaluate Enthalpy of evaporation given critical heat flux?

Enthalpy of evaporation given critical heat flux evaluator uses Change in Enthalpy of Vaporization = Critical Heat Flux/(0.18*Density of Vapour*((Surface Tension*[g]*(Density of Liquid-Density of Vapour))/(Density of Vapour^2))^0.25) to evaluate the Change in Enthalpy of Vaporization, The Enthalpy of evaporation given critical heat flux formula is defined as amount of energy (enthalpy) that must be added to a liquid substance, to transform a quantity of that substance into a gas. Change in Enthalpy of Vaporization is denoted by ∆H symbol.

How to evaluate Enthalpy of evaporation given critical heat flux using this online evaluator? To use this online evaluator for Enthalpy of evaporation given critical heat flux, enter Critical Heat Flux (Q_c), Density of Vapour (ρ_v), Surface Tension (Y) & Density of Liquid (ρ_l) and hit the calculate button.

FAQs on Enthalpy of evaporation given critical heat flux

What is the formula to find Enthalpy of evaporation given critical heat flux?

The formula of Enthalpy of evaporation given critical heat flux is expressed as Change in Enthalpy of Vaporization = Critical Heat Flux/(0.18*Density of Vapour*((Surface Tension*[g]*(Density of Liquid-Density of Vapour))/(Density of Vapour^2))^0.25). Here is an example- 500 = 332.842530370989/(0.18*0.5*((21.8*[g]*(4-0.5))/(0.5^2))^0.25).

How to calculate Enthalpy of evaporation given critical heat flux?

With Critical Heat Flux (Q_c), Density of Vapour (ρ_v), Surface Tension (Y) & Density of Liquid (ρ_l) we can find Enthalpy of evaporation given critical heat flux using the formula - Change in Enthalpy of Vaporization = Critical Heat Flux/(0.18*Density of Vapour*((Surface Tension*[g]*(Density of Liquid-Density of Vapour))/(Density of Vapour^2))^0.25). This formula also uses Gravitational acceleration on Earth constant(s).

What are the other ways to Calculate Change in Enthalpy of Vaporization?

Here are the different ways to Calculate Change in Enthalpy of Vaporization-

Change in Enthalpy of Vaporization=((1/Heat Flux)*Dynamic Viscosity of Fluid*(([g]*(Density of Liquid-Density of Vapour))/(Surface Tension))^0.5*((Specific Heat of Liquid*Excess Temperature)/(Constant in Nucleate Boiling*(Prandtl Number)^1.7))^3)^0.5

Can the Enthalpy of evaporation given critical heat flux be negative?

Yes, the Enthalpy of evaporation given critical heat flux, measured in Energy Per Mole can be negative.

Which unit is used to measure Enthalpy of evaporation given critical heat flux?

Enthalpy of evaporation given critical heat flux is usually measured using the Joule Per Mole[J/mol] for Energy Per Mole. KiloJoule Per Mole[J/mol], Kilocalorie Per Mole[J/mol] are the few other units in which Enthalpy of evaporation given critical heat flux can be measured.

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Enthalpy of evaporation given critical heat flux Formula

​GoEnthalpy of evaporation to nucleate pool boiling Formula

Enthalpy of evaporation given critical heat flux Example

Enthalpy of evaporation given critical heat flux Solution

Enthalpy of evaporation given critical heat flux Formula Elements

Other Formulas to find Change in Enthalpy of Vaporization

Other formulas in Boiling category

How to Evaluate Enthalpy of evaporation given critical heat flux?

FAQs on Enthalpy of evaporation given critical heat flux

Variable Name

GoEnthalpy of evaporation to nucleate pool boiling Formula