Reference Correlation for the Viscosity of Ethanol from the Triple Point to 620 K and Pressures Up to 102 MPa

Abstract

We present a wide-ranging correlation expressed in terms of temperature and density for the viscosity of ethanol based on critically evaluated experimental data. The correlation is designed to be used with an existing equation of state from the triple point (159 K) to 620 K and at pressures up to 102 MPa. Comparisons with experimental data indicate the estimated uncertainty of the correlation is 4.2 % (at the 95 % confidence level) for the liquid and supercritical phase at pressures up to 102 MPa, and 2 % in the gas phase. Furthermore, for calculating viscosity values at 0.1 MPa, an additional correlation is proposed, valid from the triple point to the boiling point with an estimated uncertainty of 2.3 % (at the 95 % confidence level).

Tribological Analysis of Steels in Fuel Environments: Impact of Alloy Content and Hardness

“…Surface was not considered for simplicity. The density, ρ, and viscosity, η, of ethanol were modeled based on the work reported in [34] at different pressures and temperatures. However, experimental data for high pressure (beyond 200 MPa) were not available; therefore, values were extrapolated outside the low-pressure range using models as follows.…”

“…However, experimental data for high pressure (beyond 200 MPa) were not available; therefore, values were extrapolated outside the low-pressure range using models as follows. Tabulated data at 40 • C degrees were provided by Prof. Assael based on formulae in [34] in a private communication. The variation of lubricant density ρ with pressure p was curve-fit with the Dowson-Higginson relationship:…”

Reference Correlations of the Viscosity and Thermal Conductivity of 1-Hexene from the Triple Point to High Temperatures and Pressures

“…The viscosity η can be expressed [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] as the sum of four independent contributions, as where ρ is the molar density, T is the absolute temperature, and the first term, η 0 (Τ) = η(0,Τ), is the contribution to the viscosity in the dilute-gas limit, where only two-body molecular interactions occur. The linear-in-density term, η 1 (Τ) ρ, known as the initial density dependence term, can be separately established with the development of the Rainwater-Friend theory [43][44][45] for the transport properties of moderately dense gases.…”

“…In a series of papers published over the last ten years, we reported new reference correlations over extended temperature and pressure ranges, for the viscosity of some simple fluids (xenon [3], water, [4], deuterium oxide [5], ammonia [6]), hydrocarbons (n-hexane [7], n-heptane, [8], n-undecane [9], n-hexadecane [10], benzene [11], toluene [12], cyclopentane [13]), alcohols (methanol [14], ethanol [15], ethane-1,2-diol [16], propane-1,2-diol [17]) and some refrigerants (R-1234yf and R-1234ze(E) [18], R-134a [19], R-161 [20], R-245fa [21], and R-32 [22]).…”