Enthalpy of evaporation given critical heat flux Solution

STEP 0: Pre-Calculation Summary
Formula Used
Change in Enthalpy of Vaporization = Heat Flux/(0.18*Density of Vapour*(((Surface Tension*Acceleration due to Gravity*(Density of Liquid-Density of Vapour))/(Density of Vapour^2))^0.25))
∆H = Q/(0.18*ρv*(((Y*g*(ρl-ρv))/(ρv^2))^0.25))
This formula uses 6 Variables
Variables Used
Change in Enthalpy of Vaporization - (Measured in Joule Per Mole) - 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.
Heat Flux - (Measured in Watt per Square Meter) - Heat Flux is the heat transfer rate per unit area normal to the direction of heat flow. It is denoted by the letter "q".
Density of Vapour - (Measured in Kilogram per Cubic Meter) - The Density of Vapour is the mass of a unit volume of a material substance.
Surface Tension - (Measured in Newton per Meter) - Surface Tension is the surface of a liquid that allows it to resist an external force, due to the cohesive nature of its molecules.
Acceleration due to Gravity - (Measured in Meter per Square Second) - Acceleration due to Gravity is acceleration gained by an object because of gravitational force.
Density of Liquid - (Measured in Kilogram per Cubic Meter) - Density of Liquid is mass of a unit volume of a material substance.
STEP 1: Convert Input(s) to Base Unit
Heat Flux: 40 Watt per Square Meter --> 40 Watt per Square Meter No Conversion Required
Density of Vapour: 0.5 Kilogram per Cubic Meter --> 0.5 Kilogram per Cubic Meter No Conversion Required
Surface Tension: 21.8 Newton per Meter --> 21.8 Newton per Meter No Conversion Required
Acceleration due to Gravity: 9.8 Meter per Square Second --> 9.8 Meter per Square Second No Conversion Required
Density of Liquid: 4 Kilogram per Cubic Meter --> 4 Kilogram per Cubic Meter No Conversion Required
STEP 2: Evaluate Formula
Substituting Input Values in Formula
∆H = Q/(0.18*ρv*(((Y*g*(ρlv))/(ρv^2))^0.25)) --> 40/(0.18*0.5*(((21.8*9.8*(4-0.5))/(0.5^2))^0.25))
Evaluating ... ...
∆H = 60.0986657919815
STEP 3: Convert Result to Output's Unit
60.0986657919815 Joule Per Mole --> No Conversion Required
FINAL ANSWER
60.0986657919815 60.09867 Joule Per Mole <-- Change in Enthalpy of Vaporization
(Calculation completed in 00.004 seconds)

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11 Boiling Calculators

Maximum heat flux to nucleate pool boiling
Go Heat Flux = (1.464*10^-9)*(((Specific Heat of Liquid*(Thermal Conductivity of Liquid^2)*(Density of Liquid^0.5)*(Density of Liquid-Density of Vapour))/(Density of Vapour*Change in Enthalpy of Vaporization*Dynamic Viscosity of Fluid^0.5))^0.5)*(((Change in Enthalpy of Vaporization*Density of Vapour*Excess Temperature)/(Surface Tension*Temperature of Fluid))^2.3)
Heat transfer coefficient by convection for stable film boiling
Go Heat Transfer Coefficient by Convection = 0.62*((((Thermal Conductivity of Vapor^3)*Density of Vapour*Acceleration due to Gravity*(Density of Liquid-Density of Vapour)*(Change in Enthalpy of Vaporization+(0.68*Specific Heat of Vapour)*Excess Temperature))/(Dynamic Viscosity of Vapour*Diameter*Excess Temperature))^0.25)
Heat flux to nucleate pool boiling
Go Heat Flux = Dynamic Viscosity of Fluid*Change in Enthalpy of Vaporization*(((Acceleration due to Gravity*(Density of Liquid-Density of Vapour))/(Surface Tension))^0.5)*(((Specific Heat of Liquid*Excess Temperature)/(Constant in nucleate boiling*Change in Enthalpy of Vaporization*Prandtl Number))^3.0)
Enthalpy of evaporation to nucleate pool boiling
Go Change in Enthalpy of Vaporization = ((1/Heat Flux)*Dynamic Viscosity of Fluid*((Acceleration due to Gravity*(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
Enthalpy of evaporation given critical heat flux
Go Change in Enthalpy of Vaporization = Heat Flux/(0.18*Density of Vapour*(((Surface Tension*Acceleration due to Gravity*(Density of Liquid-Density of Vapour))/(Density of Vapour^2))^0.25))
Critical heat flux to nucleate pool boiling
Go Heat Flux = 0.18*Change in Enthalpy of Vaporization*Density of Vapour*((Surface Tension*Acceleration due to Gravity*(Density of Liquid-Density of Vapour))/(Density of Vapour^2))^0.25
Heat transfer coefficient due to radiation for horizontal tubes
Go Heat Transfer Coefficient by Radiation = [Stefan-BoltZ]*Emissivity*(((Wall Temperature^4)-(Saturation Temperature^4))/(Wall Temperature-Saturation Temperature))
Emissivity given heat transfer coefficient by radiation
Go Emissivity = Heat Transfer Coefficient by Radiation/([Stefan-BoltZ]*((Wall Temperature^4-Saturation Temperature^4)/(Wall Temperature-Saturation Temperature)))
Heat transfer coefficient by radiation
Go Heat Transfer Coefficient by Radiation = (Heat Transfer Coefficient by Boiling-Heat Transfer Coefficient by Convection)/0.75
Heat transfer coefficient in film boiling
Go Heat Transfer Coefficient by Boiling = Heat Transfer Coefficient by Convection+0.75*Heat Transfer Coefficient by Radiation
Heat transfer coefficient for convection
Go Heat Transfer Coefficient by Convection = Heat Transfer Coefficient by Boiling-0.75*Heat Transfer Coefficient by Radiation

Enthalpy of evaporation given critical heat flux Formula

Change in Enthalpy of Vaporization = Heat Flux/(0.18*Density of Vapour*(((Surface Tension*Acceleration due to Gravity*(Density of Liquid-Density of Vapour))/(Density of Vapour^2))^0.25))
∆H = Q/(0.18*ρv*(((Y*g*(ρl-ρv))/(ρv^2))^0.25))

What is boiling

Boiling is the rapid vaporization of a liquid, which occurs when a liquid is heated to its boiling point, the temperature at which the vapour pressure of the liquid is equal to the pressure exerted on the liquid by the surrounding atmosphere.

How to Calculate Enthalpy of evaporation given critical heat flux?

Enthalpy of evaporation given critical heat flux calculator uses Change in Enthalpy of Vaporization = Heat Flux/(0.18*Density of Vapour*(((Surface Tension*Acceleration due to Gravity*(Density of Liquid-Density of Vapour))/(Density of Vapour^2))^0.25)) to calculate 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 calculate Enthalpy of evaporation given critical heat flux using this online calculator? To use this online calculator for Enthalpy of evaporation given critical heat flux, enter Heat Flux (Q), Density of Vapour v), Surface Tension (Y), Acceleration due to Gravity (g) & Density of Liquid l) and hit the calculate button. Here is how the Enthalpy of evaporation given critical heat flux calculation can be explained with given input values -> 6E-5 = 40/(0.18*0.5*(((21.8*9.8*(4-0.5))/(0.5^2))^0.25)).

FAQ

What is Enthalpy of evaporation given critical heat flux?
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 and is represented as ∆H = Q/(0.18*ρv*(((Y*g*(ρlv))/(ρv^2))^0.25)) or Change in Enthalpy of Vaporization = Heat Flux/(0.18*Density of Vapour*(((Surface Tension*Acceleration due to Gravity*(Density of Liquid-Density of Vapour))/(Density of Vapour^2))^0.25)). Heat Flux is the heat transfer rate per unit area normal to the direction of heat flow. It is denoted by the letter "q", The Density of Vapour is the mass of a unit volume of a material substance, Surface Tension is the surface of a liquid that allows it to resist an external force, due to the cohesive nature of its molecules, Acceleration due to Gravity is acceleration gained by an object because of gravitational force & Density of Liquid is mass of a unit volume of a material substance.
How to calculate Enthalpy of evaporation given critical heat flux?
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 is calculated using Change in Enthalpy of Vaporization = Heat Flux/(0.18*Density of Vapour*(((Surface Tension*Acceleration due to Gravity*(Density of Liquid-Density of Vapour))/(Density of Vapour^2))^0.25)). To calculate Enthalpy of evaporation given critical heat flux, you need Heat Flux (Q), Density of Vapour v), Surface Tension (Y), Acceleration due to Gravity (g) & Density of Liquid l). With our tool, you need to enter the respective value for Heat Flux, Density of Vapour, Surface Tension, Acceleration due to Gravity & Density of Liquid and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.
How many ways are there to calculate Change in Enthalpy of Vaporization?
In this formula, Change in Enthalpy of Vaporization uses Heat Flux, Density of Vapour, Surface Tension, Acceleration due to Gravity & Density of Liquid. We can use 1 other way(s) to calculate the same, which is/are as follows -
  • Change in Enthalpy of Vaporization = ((1/Heat Flux)*Dynamic Viscosity of Fluid*((Acceleration due to Gravity*(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
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