Interfacial phenomena

From Thermal-FluidsPedia

(Difference between revisions)
Jump to: navigation, search
 
(8 intermediate revisions not shown)
Line 1: Line 1:
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|Surface Tension]]</b>
+
*<b>[[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>
-
:[[Contact Angles|Contact angles]], [[wettability]] and [[Adsorption]].
+
:[[Contact Angles|Contact angles]], [[wettability|wettability and absorption]].
-
*<b>[[Phase Equilibrium in Microscale Interfacial Systems]]</b>
+
*<b>[[Phase equilibrium in microscale interfacial systems]]</b>
:[[Disjoinig Pressure|Disjoinig pressure]], and [[Interfacial Thermal Resistance|interfacial thermal resistance]].  
:[[Disjoinig Pressure|Disjoinig pressure]], and [[Interfacial Thermal Resistance|interfacial thermal resistance]].  
-
 
+
*<b>[[Transport Effects at the Interface]]</b>
 +
:[[Interfacial mass, momentum, energy, and species balances]], [[interfacial resistance in vaporization and condensation]], [[formation of and heat transfer through thin liquid films]], and [[heat transfer in the thin-film region of an axially-grooved structure]].
*<b>[[Instability of thin liquid film|Instability]]</b>
*<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 and Kelvin-Helmholtz Instability]], and [[Surface Waves on Liquid Film Flow|surface waves on liquid film flow]].
-
*<b>[[Numerical Simulation of Interfaces and Free Surfaces]]</b>
+
*<b>[[Numerical simulation of interfaces and free surfaces]]</b>
: [[Continuum Approach for Interfaces and Free Surfaces|Continuum]] and [[Noncontinuum Approach for Interfaces and Free Surfaces|noncontinuum]] approaches.
: [[Continuum Approach for Interfaces and Free Surfaces|Continuum]] and [[Noncontinuum Approach for Interfaces and Free Surfaces|noncontinuum]] approaches.
 +
 +
*<b>[[Related topics to interfacial phenomena|Related Topics]]</b>
 +
Back to [[Multiphase Systems]].<br>
Back to [[Multiphase Systems]].<br>
-
Back to [[Main Page|Thermalpedia Main Page]].
+
Back to [[Main Page|'''T'''hermal-'''F'''luids'''P'''edia Main Page]].
 +
 
 +
==References==
 +
 
 +
Faghri, A., and Zhang, Y., 2006, Transport Phenomena in Multiphase Systems, Elsevier, Burlington, MA.
 +
 
 +
==Further Reading==
 +
 
 +
==External Links==

Current revision as of 14:02, 5 August 2010

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.

Capillary pressure, interface shape at equilibrium, and effects of interfacial tension gradients.
Contact angles, wettability and absorption.
Disjoinig pressure, and interfacial thermal resistance.
Interfacial mass, momentum, energy, and species balances, interfacial resistance in vaporization and condensation, formation of and heat transfer through thin liquid films, and heat transfer in the thin-film region of an axially-grooved structure.
Rayleigh-Taylor instability and Kelvin-Helmholtz Instability, and surface waves on liquid film flow.
Continuum and noncontinuum approaches.


Back to Multiphase Systems.
Back to Thermal-FluidsPedia Main Page.

References

Faghri, A., and Zhang, Y., 2006, Transport Phenomena in Multiphase Systems, Elsevier, Burlington, MA.

Further Reading

External Links