Surface tension and surface entropy for polymer liquids

1992 ◽  
Vol 32 (2) ◽  
pp. 122-129 ◽  
Author(s):  
K. E. van Ness
Keyword(s):  
Surface Tension ◽  
Surface Entropy ◽  
Polymer Liquids

scholarly journals Surface Thermodynamics, Viscosity, Activation Energy of N-Methyldiethanolamine Aqueous Solutions Promoted by Tetramethylammonium Arginate

Entropy ◽  
2020 ◽  
Vol 22 (12) ◽  
pp. 1337
Author(s):  
Xiangfeng Tian ◽  
Lemeng Wang ◽  
Pan Zhang ◽  
Dong Fu
Keyword(s):  
Activation Energy ◽  
Surface Tension ◽  
Diffusion Coefficient ◽  
Aqueous Solutions ◽  
Quantitative Relationship ◽  
Viscosity Data ◽  
Surface Thermodynamics ◽  
Surface Entropy ◽  
Operation Conditions ◽  
Surface Enthalpy

The surface tension and viscosity values of N-methyldiethanolamine (MDEA) aqueous solutions promoted by tetramethylammonium arginate ([N1111][Arg]) were measured and modeled. The experimental temperatures were 303.2 to 323.2 K. The mass fractions of MDEA (wMDEA) and [N1111][Arg] (w[N1111][Arg]) were 0.300 to 0.500 and 0.025 to 0.075, respectively. The measured surface tension and viscosity values were satisfactorily fitted to thermodynamic models. With the aid of experimentally viscosity data, the activation energy (Ea) and H2S diffusion coefficient (DH2S) of MDEA-[N1111][Arg] aqueous solution were deduced. The surface entropy and surface enthalpy of the solutions were calculated using the fitted model of the surface tension. The quantitative relationship between the calculated values (surface tension, surface entropy, surface enthalpy, viscosity, activation energy, and H2S diffusion coefficient) and the operation conditions (mass fraction and temperature) was demonstrated.

Surface tension and surface entropy of superfluidHe4

1977 ◽  
Vol 16 (5) ◽  
pp. 1944-1953 ◽  
Author(s):  
J. R. Eckardt ◽  
D. O. Edwards ◽  
S. Y. Shen ◽  
F. M. Gasparini
Keyword(s):  
Surface Tension ◽  
Surface Entropy

Surface tension of polymer liquids

1987 ◽  
Vol 27 (5) ◽  
pp. 324-327 ◽  
Author(s):  
P. R. Couchman ◽  
K. E. Van Ness
Keyword(s):  
Surface Tension ◽  
Polymer Liquids

scholarly journals Surface tension and density of Fe – Mn melts

2020 ◽  
Vol 63 (1) ◽  
pp. 40-46
Author(s):  
N. I. Sinitsin ◽  
O. A. Chikova ◽  
V. V. V’yukhin
Keyword(s):  
Experimental Data ◽  
Surface Tension ◽  
Sessile Drop ◽  
Entropy Change ◽  
Surface Tension Coefficient ◽  
Cooling Mode ◽  
Linear Character ◽  
Surface Entropy ◽  
Concentration Dependences ◽  
Mn Content

The article presents original experimental data on surface tension of the melts Fe100 – x Mnx (x = 4 ... 13 wt. %). Surface tension and density of the melt was measured by the method of sessile drop at heating from the liquidus temperature up to 1780 °C and subsequent cooling of the sample in the atmosphere of high-purity helium. Temperature and concentration dependences of surface tension and density of Fe – Mn melts was constructed. Manganese is a surface-active substance in iron melt. The value of surface tension coefficient of Fe – Mn melts decreases while Mn content increases. Experimental data on the surface tension of Fe – Mn melts is consistent with the theoretical dependences (Pavlova-Popiel equation and the Shishkovsky equation). During the study of microheterogeneity of Fe – Mn melts, correlation between the values of kinematic viscosity, surface tension and density was determined. Dependence of the fluidity of Fe – Mn melts on their density in the cooling mode has a linear character which indicates the implementation of the Bachinsky law. Discrepancy of values of the ratio of melt viscosity to the surface tension coefficient was obtained from experimental data and was calculated by the empirical formula. According to the experimental data on viscosity and surface tension of Fe – Mn melts, the authors have evaluated the entropy change in volume of the melt and change of surface entropy of the melt, respectively. Surface entropy of the melt and entropy in the melt volume decreases in absolute value with increase of Mn content in it. According to the results of the work, it was concluded that there is no destruction of the microheterogeneous structure of Fe100 – x Mnx melts (x = 4 ... 13 wt. %) when heated up to 1780 °С.

Surface tension of polymer liquids

1968 ◽  
Vol 72 (6) ◽  
pp. 2013-2017 ◽  
Author(s):  
Ryong-Joon Roe
Keyword(s):  
Surface Tension ◽  
Polymer Liquids

scholarly journals Surface tension and density of Fe – Mn melts

2020 ◽  
Vol 63 (1) ◽  
pp. 40-46
Author(s):  
N. I. Sinitsin ◽  
O. A. Chikova ◽  
V. V. V’yukhin
Keyword(s):  
Experimental Data ◽  
Surface Tension ◽  
Sessile Drop ◽  
Entropy Change ◽  
Surface Tension Coefficient ◽  
Cooling Mode ◽  
Linear Character ◽  
Surface Entropy ◽  
Concentration Dependences ◽  
Mn Content

The article presents original experimental data on surface tension of the melts Fe100 – x Mnx (x = 4 ... 13 wt. %). Surface tension and density of the melt was measured by the method of sessile drop at heating from the liquidus temperature up to 1780 °C and subsequent cooling of the sample in the atmosphere of high-purity helium. Temperature and concentration dependences of surface tension and density of Fe – Mn melts was constructed. Manganese is a surface-active substance in iron melt. The value of surface tension coefficient of Fe – Mn melts decreases while Mn content increases. Experimental data on the surface tension of Fe – Mn melts is consistent with the theoretical dependences (Pavlova-Popiel equation and the Shishkovsky equation). During the study of microheterogeneity of Fe – Mn melts, correlation between the values of kinematic viscosity, surface tension and density was determined. Dependence of the fluidity of Fe – Mn melts on their density in the cooling mode has a linear character which indicates the implementation of the Bachinsky law. Discrepancy of values of the ratio of melt viscosity to the surface tension coefficient was obtained from experimental data and was calculated by the empirical formula. According to the experimental data on viscosity and surface tension of Fe – Mn melts, the authors have evaluated the entropy change in volume of the melt and change of surface entropy of the melt, respectively. Surface entropy of the melt and entropy in the melt volume decreases in absolute value with increase of Mn content in it. According to the results of the work, it was concluded that there is no destruction of the microheterogeneous structure of Fe100 – x Mnx melts (x = 4 ... 13 wt. %) when heated up to 1780 °С.

The surface tension of polymer liquids

1998 ◽  
Vol 47 (2) ◽  
pp. 161-205 ◽  
Author(s):  
Gregory T. Dee ◽  
Bryan B. Sauer
Keyword(s):  
Surface Tension ◽  
Polymer Liquids

scholarly journals A Numerical Investigation on the Collision Behavior of Polymer Droplets

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 263 ◽  
Author(s):  
Lijuan Qian ◽  
Hongchuan Cong ◽  
Chenlin Zhu
Keyword(s):  
Surface Tension ◽  
Adaptive Mesh Refinement ◽  
Internal Flow ◽  
Adaptive Mesh ◽  
Flow Region ◽  
Dissipated Energy ◽  
Positive Pressure ◽  
Maximum Deformation ◽  
Droplet Collisions ◽  
Polymer Liquids

Binary droplet collisions are a key mechanism in powder coatings production, as well as in spray combustion, ink-jet printing, and other spray processes. The collision behavior of the droplets using Newtonian and polymer liquids is studied numerically by the coupled level-set and volume of fluid (CLSVOF) method and adaptive mesh refinement (AMR). The deformation process, the internal flow fields, and the energy evolution of the droplets are discussed in detail. For binary polymer droplet collisions, compared with the Newtonian liquid, the maximum deformation is promoted. Due to the increased viscous dissipation, the colliding droplets coalesce more slowly. The stagnant flow region in the velocity field increases and the flow re-direction phenomenon is suppressed, so the polymer droplets coalesce permanently. As the surface tension of the polymer droplets decreases, the kinetic and the dissipated energy increases. The maximum deformation is promoted, and the coalescence speed of the droplets slows down. During the collision process, the dominant pressure inside the polymer droplets varies from positive pressure to negative pressure and then to positive pressure. At low surface tension, due to the non-synchronization in the movement of the interface front, the pressure is not smooth and distributes asymmetrically near the center of the droplets.

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