Screen I

I. Viscosity of Liquid Hydrocarbons at Atmospheric Pressure Back to Main

This page is used to determine the viscosity of liquid Hydrocarbons at atmospheric pressure by obtaining information from the Viscosity of Pure Paraffin Hydrocarbons graph (figure 3.19) and using that data with the equation

Equation (3.24)

Where: m = viscosity of mixture in centipoise

= component viscosity

= mol fraction of each component in the mixture

Viscosity is the measurement of the resistance of fluids. It is that number, which represents the drag forces, caused by the attractive forces in adjacent layers. It might be considered the internal friction between molecules. Figure 3.19 shows the viscosity at atmospheric pressure for common light paraffin hydrocarbons, as a function of temperature.

To calculate the viscosity the Temperature and Mole % of the gas must be entered into their entry spaces. To do so, use the mouse to click the curser into the entry space and input the data. Once this has been done, select Run to execute the solution.

The component table is a list of the possible compounds along with their symbols to be used with this program. In the far right column titled Mole % use the mouse to choose the available cell and enter the mole fraction of the component in the mixture. Use the Up and Down arrow keys to move from cell to cell. The total for the Mole % should be 100.00.

Temperature is the temperature of the Liquid in SI units, Celsius and Kelvin or in English units, Fahrenheit and Rankine.

° C = 0.556 (° F - 32), K = ° C + 273, ° F = (1.8)(° C) + 32, ° R = ° F + 460

Paraffins are hydrocarbons that end in –ane, and in each case the number of hydrogen atoms are two times the number of carbon atoms plus two more for the ends of the chain.

Example: Methane (CH4)

|  | H |  |
H | - | C | - | H
|  | H |  |

To convert data values from one unit to another, please refer to Set Auto Convert and Unit Conversion

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