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## Diffusivity Based on Film Theory Solution

STEP 0: Pre-Calculation Summary
Formula Used
Diffusion Coefficient = Convective Mass Transfer Coefficient*Film Thickness
DAB = kL*h
This formula uses 2 Variables
Variables Used
Convective Mass Transfer Coefficient - Convective Mass Transfer Coefficient is a function of geometry of the system and the velocity and properties of the fluid similar to the heat transfer coefficient. (Measured in Meter per Second)
Film Thickness - The Film Thickness Value is defined as the ratio of the product of the absolute viscosity, area and velocity of moving plate to tangential force. (Measured in Meter)
STEP 1: Convert Input(s) to Base Unit
Convective Mass Transfer Coefficient: 0.0095 Meter per Second --> 0.0095 Meter per Second No Conversion Required
Film Thickness: 0.005 Meter --> 0.005 Meter No Conversion Required
STEP 2: Evaluate Formula
Substituting Input Values in Formula
DAB = kL*h --> 0.0095*0.005
Evaluating ... ...
DAB = 4.75E-05
STEP 3: Convert Result to Output's Unit
4.75E-05 Square Meter Per Second --> No Conversion Required
4.75E-05 Square Meter Per Second <-- Diffusion Coefficient
(Calculation completed in 00.015 seconds)

## < 7 Mass Transfer Theories Calculators

Penetration Theory of Mass Transfer
Convective Mass Transfer Coefficient = 2*sqrt(Diffusion Coefficient/(pi*Contact Time)) Go
Contact Time based on Penetration Theory
Contact Time = (4*Diffusion Coefficient)/((Convective Mass Transfer Coefficient^2)*pi) Go
Mass Transfer Coefficient based on Surface Renewal Theory
Convective Mass Transfer Coefficient = sqrt(Diffusion Coefficient*Surface Renewal Rate) Go
Surface Renewal Rate based on Surface Renewal Theory
Surface Renewal Rate = (Convective Mass Transfer Coefficient^2)/Diffusion Coefficient Go
Mass Transfer Coefficient based on Film Theory
Convective Mass Transfer Coefficient = Diffusion Coefficient/Film Thickness Go
Film Thickness based on Film Theory
Film Thickness = Diffusion Coefficient/Convective Mass Transfer Coefficient Go
Diffusivity Based on Film Theory
Diffusion Coefficient = Convective Mass Transfer Coefficient*Film Thickness Go

### Diffusivity Based on Film Theory Formula

Diffusion Coefficient = Convective Mass Transfer Coefficient*Film Thickness
DAB = kL*h

## What is Film Theory in Mass Transfer ?

Film theory in Mass transfer states that the resistance in mass transfer between fluid phases in turbulent flow is present in a thin layer adjacent to the interface called film. As per Film Theory (Whitman 1932), the mass transfer coefficient is equal to the ratio of diffusivity to film thickness.

## How to Calculate Diffusivity Based on Film Theory?

Diffusivity Based on Film Theory calculator uses Diffusion Coefficient = Convective Mass Transfer Coefficient*Film Thickness to calculate the Diffusion Coefficient, The Diffusivity Based on Film Theory formula is used to calculate the diffusivity for the liquid phase in contact with the other phase based on film theory when film thickness and mass transfer coefficient are known. Diffusion Coefficient is denoted by DAB symbol.

How to calculate Diffusivity Based on Film Theory using this online calculator? To use this online calculator for Diffusivity Based on Film Theory, enter Convective Mass Transfer Coefficient (kL) & Film Thickness (h) and hit the calculate button. Here is how the Diffusivity Based on Film Theory calculation can be explained with given input values -> 4.750E-5 = 0.0095*0.005.

### FAQ

What is Diffusivity Based on Film Theory?
The Diffusivity Based on Film Theory formula is used to calculate the diffusivity for the liquid phase in contact with the other phase based on film theory when film thickness and mass transfer coefficient are known and is represented as DAB = kL*h or Diffusion Coefficient = Convective Mass Transfer Coefficient*Film Thickness. Convective Mass Transfer Coefficient is a function of geometry of the system and the velocity and properties of the fluid similar to the heat transfer coefficient & The Film Thickness Value is defined as the ratio of the product of the absolute viscosity, area and velocity of moving plate to tangential force.
How to calculate Diffusivity Based on Film Theory?
The Diffusivity Based on Film Theory formula is used to calculate the diffusivity for the liquid phase in contact with the other phase based on film theory when film thickness and mass transfer coefficient are known is calculated using Diffusion Coefficient = Convective Mass Transfer Coefficient*Film Thickness. To calculate Diffusivity Based on Film Theory, you need Convective Mass Transfer Coefficient (kL) & Film Thickness (h). With our tool, you need to enter the respective value for Convective Mass Transfer Coefficient & Film Thickness 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 Diffusion Coefficient?
In this formula, Diffusion Coefficient uses Convective Mass Transfer Coefficient & Film Thickness. We can use 2 other way(s) to calculate the same, which is/are as follows -
• Diffusion Coefficient = (Contact Time*(Convective Mass Transfer Coefficient^2)*pi)/4
• Diffusion Coefficient = (Convective Mass Transfer Coefficient^2)/ Surface Renewal Rate
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