Thermophysical Properties: Dowtherm
From Thermal-FluidsPedia
Diphenyl mixture (Dowtherm*), Molecular Mass: 166.0, (Tsat= 258 °C; Tm = 12 °C) T Temp. ˚C pv saturation pressure (105 Pa) hlv latent heat (kJ/kg) ρℓ liquid density (kg/m³) ρv vapor density (kg/m³) μℓ liquid viscosity (10-5 N-s/m²) μv vapor viscosity (10-5 N-s/m²) kℓ liquid thermal conductivity (W/m-K) kv vapor thermal conductivity (W/m-K) σ liquid surface tension (10-3N/m) cp,ℓ liquid specific heat (kJ/kg-K) cp,v vapor specific heat (kJ/kg-K) 100 0.006 345 995 0.035 101.0 0.68 0.126 31.6 1.88 150 0.051 329 953 0.24 60.3 0.77 0.119 26.5 2.14 200 0.245 314 912 0.99 40.7 0.87 0.110 21.8 2.34 250 0.843 291 871 3.20 29.7 0.97 0.104 17.3 2.60 300 2.330 264 825 8.70 22.7 1.07 0.096 12.9 2.76 350 5.200 235 772 20.0 18.2 1.17 0.090 8.9 2.89 400 10.43 207 709 42.0 14.9 1.26 0.083 5.0 3.01
Propertya Temp. α0 α1 α2 α3 α4 α5 Error(%) pv (105Pa) 100– 400 °C -13.659 1.3474-1b -6.8307-4 2.2792-6 -4.1046-9 2.9887-12 0.27 
(kJ/kg) 100– 400 °C 6.2599 -9.1562-3 7.6261-5 -3.1904-7 5.9931-10 -4.2875-13 0.06 ρℓ (kg/m³) 100– 400 °C 6.9789 -5.5143-4 -3.6109-6 1.9442-8 -4.6172-11 3.1349-14 0.01 ρv (kg/m³) 100– 400 °C -11.565 1.3514-1 -7.4914-4 2.6390-6 -4.8454-9 3.5407-12 0.05 μℓ (10-5Ns/m²) 100– 400 °C 6.5143 -2.8763-2 1.3375-4 -4.3101-7 7.6306-10 -5.5244-13 0.08 μv (10-5 Ns/m²) 100– 400 °C -4.7238-1 -1.7885-3 4.1595-5 -1.8502-7 3.7586-10 2.9462-13 0.01 kℓ (W/m-K) 100– 400 °C -2.1714 4.1094-3 -4.6356-5 1.8565-7 -3.5315-10 2.5537-13 0.33 kv (W/m-K) σ (10-3 N/m) 100– 400 °C 4.3058 -1.7285-2 1.4156-4 -6.7840-7 1.5240-9 -1.3701-12 0.16 cp,ℓ (kJ/kg-K) 100– 400 °C -3.1706-1 2.0074-2 -1.6404-4 7.2357-7 -1.5446-9 1.2569-12 0.34 cp,v (kJ/kg-K)
a Polynomial function: ln(Property) = α0 + α1T + α2T2 + α3T3 + α4T4 + α5T5
References
Faghri, A., and Zhang, Y., 2006, Transport Phenomena in Multiphase Systems, Elsevier, Burlington, MA.
Faghri Amir , Zhang Yuwen , Howell John, 2010, Advanced Heat and Mass Transfer, Global Digital Press, Columbia, MO
Ivanovskii, M.N., Sorokin, V.P., and Yagodkin, I.V., 1982, The Physical Principles of Heat Pipes, Clarendon Press, Oxford, UK.
Vargaftik, N.B., 1975, Handbook of Physical Properties of Liquids and Gases, Hemisphere, New York, NY.