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Temperature dependence of capillary dynamics: a multiphase and multicomponent adiabatic approach.
Federico Maggi1, Fernando Alonso-Marroquin1
1School of Civil Engineering, University of Sydney, Sydney 2006, NSW, Australia.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|December 17, 2013
Summary
Temperature significantly impacts multiphase fluid flow in capillaries. This study reveals how temperature influences capillary rise dynamics, affecting flow regimes and system behavior.
Area of Science:
- Fluid Dynamics
- Thermodynamics
- Physical Chemistry
Background:
- Multiphase flow in confined geometries is crucial in various industrial and natural processes.
- Understanding temperature effects on fluid properties like viscosity and surface tension is essential for accurate modeling.
- Previous studies often simplified or neglected the explicit role of temperature in dynamic capillary phenomena.
Purpose of the Study:
- To analyze the influence of temperature on the flow dynamics of miscible multiphase systems within uniform cylindrical capillaries under adiabatic conditions.
- To investigate how temperature variations affect key parameters such as dynamic contact angle, interfacial tension, and fluid properties.
- To characterize the resulting flow regimes and dynamic attractors influenced by temperature.
Main Methods:
- Development of a mathematical framework incorporating temperature-dependent fluid properties and forces (conservative and nonconservative).
- Inclusion of temperature effects on dynamic contact angle, three-phase contact line tension, densities, and viscosities.
- Analysis of fluid retardation effects in capillary end reservoirs.
- Observation of temperature-dependent flow regimes, including nonoscillatory and oscillatory behaviors.
Main Results:
- Temperature was explicitly integrated into models for dynamic contact angle, interfacial tension, and fluid properties (density, viscosity).
- Observed transitions in flow regimes from nonoscillatory to oscillatory in two-phase systems (water-ethanol and pure ether).
- Ca-Bo orbits demonstrated temperature-dependent dynamic attractors, highlighting unique system behaviors.
Conclusions:
- Temperature plays a critical and independent role in governing the dynamical characteristics of capillary rise flow.
- The study provides a comprehensive understanding of temperature's influence on multiphase fluid dynamics in capillaries.
- Findings are applicable to optimizing processes involving capillary flow where temperature fluctuations occur.
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