Related Experiment Video
Updated: Feb 17, 2026
10:29
Experimental Methodology for Estimation of Local Heat Fluxes and Burning Rates in Steady Laminar Boundary Layer Diffusion Flames
Published on: June 1, 2016
12.4K
Reference Correlations for the Viscosity and Thermal Conductivity of n-Undecane
M J Assael1, T B Papalas1, M L Huber2
1Laboratory of Thermophysical Properties and Environmental Processes, Chemical Engineering Department, Aristotle University, Thessaloniki 54636, Greece.
Journal of Physical and Chemical Reference Data
|December 13, 2017
Summary
New correlations for n-undecane viscosity and thermal conductivity were developed using experimental data. These correlations are compatible with a recent equation of state, offering accurate predictions across a wide temperature and pressure range.
Area of Science:
- Chemical Engineering
- Physical Chemistry
- Thermodynamics
Background:
- Accurate thermophysical property data, including viscosity and thermal conductivity, are crucial for chemical process design and simulation.
- Existing correlations may not cover the wide range of conditions required for modern industrial applications.
Purpose of the Study:
- To develop new, wide-ranging correlations for the viscosity and thermal conductivity of n-undecane.
- To ensure these correlations are consistent with a recently published equation of state.
Main Methods:
- Critically evaluated experimental data for n-undecane.
- Developed new correlation models for viscosity and thermal conductivity.
- Validated correlations against the equation of state and experimental data.
Main Results:
- New correlations for n-undecane viscosity and thermal conductivity are presented.
- Correlations are valid from the triple point to 700 K and up to 500 MPa.
- Estimated uncertainties are 2.4% for dilute-gas viscosity, 5% for liquid viscosity, 3% for low-density gas thermal conductivity, and 3% for liquid thermal conductivity.
Conclusions:
- The developed correlations provide accurate predictions for n-undecane properties within the specified ranges.
- Correlations exhibit physically reasonable behavior upon extrapolation but require caution outside validated ranges, especially in the critical region.
Related Concept Videos
01:23Correlation of Experimental Data
493
Dimensional analysis simplifies complex physical problems and guides experimental investigations, but it does not provide complete solutions. It identifies the dimensionless groups that influence a phenomenon, but experimental data is needed to establish the specific relationships and validate theoretical predictions.
For example, a spherical particle moving through a viscous fluid experiences drag. Dimensional analysis shows that the drag force depends on the particle's diameter, velocity,...
For example, a spherical particle moving through a viscous fluid experiences drag. Dimensional analysis shows that the drag force depends on the particle's diameter, velocity,...
493
01:19Viscosity of Fluid
1.3K
Viscosity measures the resistance a fluid offers to flow and deformation. It results from internal friction between layers of fluid moving relative to one another. Dynamic viscosity, denoted by the Greek letter mu (μ), quantifies the force needed to move one fluid layer over another. For Newtonian fluids like water and air, the relationship between the shearing stress and the rate of shearing strain is linear, meaning their viscosity remains constant regardless of the applied stress.
1.3K
01:24Thermodynamics: Activity Coefficient
3.0K
Activity is the measure of the effective concentration of the species in solution. It can be expressed as the product of the molar concentration of the species and its activity coefficient. The activity coefficient is a dimensionless quantity and depends on the total ionic strength of the solution.
The activity coefficient is a measure of the deviation from ideal behavior. When the ionic strength of the solution is minimal, the activity coefficient of an ionic species is close to unity, making...
The activity coefficient is a measure of the deviation from ideal behavior. When the ionic strength of the solution is minimal, the activity coefficient of an ionic species is close to unity, making...
3.0K
02:33Physical Properties of Alkanes
15.2K
Alkanes are nonpolar molecules due to the presence of only carbon and hydrogen atoms. The electronegativity difference between carbon and hydrogen is minimal, and hence alkanes have a zero dipole moment. This leads to the presence of only dispersion forces between the molecules. The strength of dispersion forces is dependent on the surface area of the molecules on which they act. Since the surface area increases with the molecular length for straight-chain alkanes, the dispersion forces also...
15.2K
02:34Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility
52.1K
Intermolecular forces are attractive forces that exist between molecules. They dictate several bulk properties, such as melting points, boiling points, and solubilities (miscibilities) of substances. Molar mass, molecular shape, and polarity affect the strength of different intermolecular forces, which influence the magnitude of physical properties across a family of molecules.
Temporary attractive forces like dispersion are present in all molecules, whether they are polar or nonpolar. They...
Temporary attractive forces like dispersion are present in all molecules, whether they are polar or nonpolar. They...
52.1K
01:25Heat Capacities of an Ideal Gas III
3.4K
The number of independent ways a gas molecule can move along straight line, rotate, and vibrate is called its degrees of freedom. Supposing d represents the number of degrees of freedom of an ideal gas, the molar heat capacity at constant volume of an ideal gas in terms of d is
3.4K