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Film Thickness by Film Theory Formula

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The Film Thickness is the thickness between the wall or the phase boundary or the interface to the other end of the film. Check FAQs

δ = \frac{D AB}{k L}

δ - Film Thickness?D_AB - Diffusion Coefficient (DAB)?k_L - Convective Mass Transfer Coefficient?

Film Thickness by Film Theory Example

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Here is how the Film Thickness by Film Theory equation looks like with Values.

Here is how the Film Thickness by Film Theory equation looks like with Units.

Here is how the Film Thickness by Film Theory equation looks like.

0.7368 = \frac{0.007}{0.0095}

0.7368m = \frac{0.007m²/s}{0.0095m/s}

0.7368 = \frac{0.007}{0.0095}

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Film Thickness by Film Theory Solution

Follow our step by step solution on how to calculate Film Thickness by Film Theory?

FIRST Step Consider the formula

δ = \frac{D AB}{k L}

Next Step Substitute values of Variables

∴

δ = \frac{0.007m²/s}{0.0095m/s}

Next Step Prepare to Evaluate

∴

δ = \frac{0.007}{0.0095}

Next Step Evaluate

∴

δ = 0.736842105263158m

LAST Step Rounding Answer

∴

δ = 0.7368m

Film Thickness by Film Theory Formula Elements

Variables

Film Thickness

The Film Thickness is the thickness between the wall or the phase boundary or the interface to the other end of the film.

Symbol: δ

Measurement: LengthUnit: m

Note: Value should be greater than 0.

Formulas to find Film Thickness

Diffusion Coefficient (DAB)

The Diffusion Coefficient (DAB) is the amount of a particular substance that diffuses across a unit area in 1 second under the influence of a gradient of one unit.

Symbol: D_AB

Measurement: DiffusivityUnit: m²/s

Note: Value should be greater than 0.

Formulas to find Diffusion Coefficient (DAB)

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.

Symbol: k_L

Measurement: SpeedUnit: m/s

Note: Value can be positive or negative.

Formulas to find Convective Mass Transfer Coefficient

Other formulas in Mass Transfer Theories category

Go Mass Transfer Coefficient by Film Theory

k L = \frac{D AB}{δ}

Go Average Mass Transfer Coefficient by Penetration Theory

k L (Avg) = 2 \cdot \sqrt{\frac{D AB}{π \cdot t c}}

Go Mass Transfer Coefficient by Surface Renewal Theory

k L = \sqrt{D AB \cdot s}

Go Liquid Phase Mass Transfer Coefficient by Two Film Theory

K x = \frac{1}{(\frac{1}{k y \cdot H}) + (\frac{1}{k x})}

How to Evaluate Film Thickness by Film Theory?

Film Thickness by Film Theory evaluator uses Film Thickness = Diffusion Coefficient (DAB)/Convective Mass Transfer Coefficient to evaluate the Film Thickness, The Film Thickness by Film Theory formula is used to calculate the film thickness based on the Film Theory where diffusivity and mass transfer coefficient are known. Film Thickness is denoted by δ symbol.

How to evaluate Film Thickness by Film Theory using this online evaluator? To use this online evaluator for Film Thickness by Film Theory, enter Diffusion Coefficient (DAB) (D_AB) & Convective Mass Transfer Coefficient (k_L) and hit the calculate button.

FAQs on Film Thickness by Film Theory

What is the formula to find Film Thickness by Film Theory?

The formula of Film Thickness by Film Theory is expressed as Film Thickness = Diffusion Coefficient (DAB)/Convective Mass Transfer Coefficient. Here is an example- 0.736842 = 0.007/0.0095.

How to calculate Film Thickness by Film Theory?

With Diffusion Coefficient (DAB) (D_AB) & Convective Mass Transfer Coefficient (k_L) we can find Film Thickness by Film Theory using the formula - Film Thickness = Diffusion Coefficient (DAB)/Convective Mass Transfer Coefficient.

Can the Film Thickness by Film Theory be negative?

No, the Film Thickness by Film Theory, measured in Length cannot be negative.

Which unit is used to measure Film Thickness by Film Theory?

Film Thickness by Film Theory is usually measured using the Meter[m] for Length. Millimeter[m], Kilometer[m], Decimeter[m] are the few other units in which Film Thickness by Film Theory can be measured.

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