Refutation Equation Calculator for Viscosity Blending Index

This calculator helps determine the Viscosity Blending Index (VBI) for petroleum products by calculating the ratio of kinematic viscosities of two components.

Input Parameters

Calculation Results

Calculation Formula

VBI = log₁₀(ν₁/ν₂) - (ρ₁ - ρ₂)/1200

Where:
VBI = Viscosity Blending Index
ν₁ = Kinematic Viscosity of Component 1 (mm²/s)
ν₂ = Kinematic Viscosity of Component 2 (mm²/s)
ρ₁ = Density of Component 1 (kg/m³)
ρ₂ = Density of Component 2 (kg/m³)

Results

Viscosity Blending Index (VBI):

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Refutation Equation Calculator for Viscosity Blending Index Calculator Usage Guide

Learn how to use the Refutation Equation Calculator for Viscosity Blending Index calculator and its working principles

How to Use This Calculator

  1. Enter the kinematic viscosity and density for Component 1 in the respective fields.
  2. Enter the kinematic viscosity and density for Component 2 in the respective fields.
  3. Click the "Calculate" button to compute the Viscosity Blending Index (VBI).
  4. The result will be displayed in the "Results" section.

Understanding the Formula

The Viscosity Blending Index (VBI) is calculated using the following formula:

VBI = log₁₀(ν₁/ν₂) - (ρ₁ - ρ₂)/1200

This formula accounts for both the relative viscosity difference between two components and their density difference, providing a single value that characterizes how the two components will blend together.

Applications

This calculator is particularly useful in the petroleum industry for:

  • Quality control of petroleum products
  • Formulation of fuel and lubricant blends
  • Understanding the behavior of mixed hydrocarbon streams

Example

Suppose you have two petroleum components with the following properties:

  • Component 1: Kinematic Viscosity = 5.0 mm²/s, Density = 850 kg/m³
  • Component 2: Kinematic Viscosity = 2.5 mm²/s, Density = 820 kg/m³

Using the calculator, you would enter these values and get a VBI value that indicates how well these components will blend based on their viscosity and density properties.