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Mears Criterion for External Film Mass Transfer Limitation Calculator

Easily calculate and compute mears criterion for external film mass transfer limitation calculator with accurate equations, live formulas, and expert guidance.

Measured catalytic rate.

Bulk bed density of catalyst.

Outer pellet radius.

Fluid boundary layer mass transfer coefficient.

Concentration in bulk flowing stream.

Reaction order with respect to reactant A.

Calculated Result
0 dimless

Mears Number

Mears Number

0 dimless

Mears Parameter Value

0.004

Allowable Threshold

0.15

External Mass Transfer Status

External Film Resistance Negligible (< 0.15/n, Pure Kinetics)

Boundary Film Delta Concentration Mol M3

0.2

0 — dimless

Calculation Breakdown

  1. Applied FormulaEvaluates the Mears criterion to verify whether stagnant fluid boundary film mass transfer between bulk gas/liquid and the external catalyst pellet surface limits the observed reaction rate.\frac{-r'_{A,obs} \rho_b R_p}{k_c C_{Ab}} < \frac{0.15}{n}

Mears Criterion Metric Output

Interactive visualization based on your current inputs

Calculated Value
0.00.30.50.81.0Mears Number

What Is the Mears Criterion for External Film Mass Transfer Limitation Calculator?

This tool computes mears criterion for external film mass transfer limitation calculator with high precision arithmetic.

How Does the Mears Criterion for External Film Mass Transfer Limitation Calculator Work?

Evaluates the Mears criterion to verify whether stagnant fluid boundary film mass transfer between bulk gas/liquid and the external catalyst pellet surface limits the observed reaction rate.

Mears Criterion for External Film Mass Transfer Limitation Calculator Formula & Variables

The core mathematical equation utilized by this calculator is expressed as:

−rA,obs′ρbRpkcCAb<0.15n\frac{-r'_{A,obs} \rho_b R_p}{k_c C_{Ab}} < \frac{0.15}{n}

Evaluates the Mears criterion to verify whether stagnant fluid boundary film mass transfer between bulk gas/liquid and the external catalyst pellet surface limits the observed reaction rate.

How to Use the Mears Criterion for External Film Mass Transfer Limitation Calculator

  1. Enter your parameters into the designated input fields to calculate the result immediately.

Step-by-Step Example Calculation

Mears Criterion for External Film Mass Transfer Limitation Calculator Example

Input Values:

observedReactionRateMolPerKgS:0.0028
catalystBulkDensityKgPerM3:1100
pelletRadiusMeters:0.0018
fluidMassTransferCoeffMPerS:0.025
bulkFluidConcentrationMolPerM3:50
reactionOrderN:1
Worked Steps: Sample evaluation based on standard reference conditions.

Understanding Your Result

The calculated primary figure indicates the optimal or required dimless.

Factors That Affect the Result

  • Measurement tolerances, operational variance, and real-world conditions.

When Should You Use This Calculator?

  • Everyday budgeting, technical homework, professional estimation, and household projects.

Assumptions & Limitations

  • Assumes standard atmospheric or environmental parameters unless specified.

Frequently Asked Questions

Calculation Accuracy & Reference Note

Double-precision IEEE 754 arithmetic with validated empirical constants.

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