Interfacial phenomena
From Thermal-FluidsPedia
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The interfacial region between two homogeneous phases contains matter in a distinct physical state; that is to say, matter in the interfacial state exhibits properties different from those matters in the gaseous, liquid, or solid states. As a result, as soon as interfaces are considered explicitly, new variables – for example, interfacial surface tension – enter into the classical thermodynamic description of equilibrium systems. Interfaces in equilibrium systems need not be considered explicitly unless the surface-to-volume ratio is large, because the contribution of interfacial free energy to the total free energy is usually small. However, interfacial effects on the dynamic behavior of flow systems can be profound, even when the proportion of matter in interfacial regions is extremely small. Furthermore, motion may originate in an interface in systems that are not in thermal or compositional equilibrium.<br> | The interfacial region between two homogeneous phases contains matter in a distinct physical state; that is to say, matter in the interfacial state exhibits properties different from those matters in the gaseous, liquid, or solid states. As a result, as soon as interfaces are considered explicitly, new variables – for example, interfacial surface tension – enter into the classical thermodynamic description of equilibrium systems. Interfaces in equilibrium systems need not be considered explicitly unless the surface-to-volume ratio is large, because the contribution of interfacial free energy to the total free energy is usually small. However, interfacial effects on the dynamic behavior of flow systems can be profound, even when the proportion of matter in interfacial regions is extremely small. Furthermore, motion may originate in an interface in systems that are not in thermal or compositional equilibrium.<br> | ||
| - | *<b>[[Surface Tension]]</b> | + | *<b>[[Surface tension|Surface Tension]]</b> |
:[[Capillary Pressure|Capillary pressure]], [[Interface Shape at Equilibrium|interface shape at equilibrium]], and [[Effects of Interfacial Tension Gradients|effects of interfacial tension gradients]]. | :[[Capillary Pressure|Capillary pressure]], [[Interface Shape at Equilibrium|interface shape at equilibrium]], and [[Effects of Interfacial Tension Gradients|effects of interfacial tension gradients]]. | ||
*<b>[[Contact Angle and Wettability]]</b> | *<b>[[Contact Angle and Wettability]]</b> | ||
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:[[Disjoinig Pressure|Disjoinig pressure]], and [[Interfacial Thermal Resistance|interfacial thermal resistance]]. | :[[Disjoinig Pressure|Disjoinig pressure]], and [[Interfacial Thermal Resistance|interfacial thermal resistance]]. | ||
| - | *<b>[[Instability of | + | *<b>[[Instability of thin liquid film|Instability]]</b> |
:[[Rayleigh-Taylor Instability|Rayleigh-Taylor instability]],[[Kelvin-Helmholtz Instability|Kelvin-Helmholtz instability]], and [[Surface Waves on Liquid Film Flow|surface waves on liquid film flow]]. | :[[Rayleigh-Taylor Instability|Rayleigh-Taylor instability]],[[Kelvin-Helmholtz Instability|Kelvin-Helmholtz instability]], and [[Surface Waves on Liquid Film Flow|surface waves on liquid film flow]]. | ||
Revision as of 21:01, 30 August 2009
The interfacial region between two homogeneous phases contains matter in a distinct physical state; that is to say, matter in the interfacial state exhibits properties different from those matters in the gaseous, liquid, or solid states. As a result, as soon as interfaces are considered explicitly, new variables – for example, interfacial surface tension – enter into the classical thermodynamic description of equilibrium systems. Interfaces in equilibrium systems need not be considered explicitly unless the surface-to-volume ratio is large, because the contribution of interfacial free energy to the total free energy is usually small. However, interfacial effects on the dynamic behavior of flow systems can be profound, even when the proportion of matter in interfacial regions is extremely small. Furthermore, motion may originate in an interface in systems that are not in thermal or compositional equilibrium.
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