Two Phase Flow
Two Phase Flow - Related Videos
10:39
Single and Two-phase Flow in a Packed Bed Reactor
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2023
Source: Kerry M. Dooley and Michael G. Benton, Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA The goal of this experiment is to determine the magnitude of maldistribution in typical packed bed reactors in both single phase and two-phase (gas-liquid) flow and evaluate the effects of this maldistribution on pressure drop. The concepts of residence time distribution and dispersion are introduced through the use of tracers, and these concepts are related to physical...
03:52
Phase Contrast Magnetic Resonance Imaging to Assess Blood Flow in the Arteries of a Rat
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2025
Source: Chiu, S., et al. Phase Contrast Magnetic Resonance Imaging in the Rat Common Carotid Artery. J. Vis. Exp. (2018).This video demonstrates phase contrast magnetic resonance imaging (PC-MRI) to measure blood flow in the common carotid artery of a rat. After securing an anesthetized rat on the MRI bed and ensuring stable physiological parameters, the common carotid artery is scanned to capture images at defined intervals. Blood flow is then computed from these images to evaluate changes...
02:31
Phase Transitions
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2020
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to occupy...
02:39
Phase Diagrams
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2020
A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
09:42
Solid Phase Synthesis
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2023
Source: Vy M. Dong and Diane Le, Department of Chemistry, University of California, Irvine, CA Merrifield's solid-phase synthesis is a Nobel Prize winning invention where a reactant molecule is bound on a solid support and undergoes successive chemical reactions to form a desired compound. When the molecules are bound to a solid support, excess reagents and byproducts can be removed by washing away the impurities, while the target compound remains bound to the resin. Specifically, we will...
FAQs
Interfacial tension governs how strongly the boundary between phases resists deformation. Its interaction with viscosity, density, pressure, and flow rate helps determine whether the phases form bubbles, droplets, slugs, or stratified layers. Because interface shape affects contact between phases, controlling these conditions can change mass and heat transfer and improve the consistency of transport through a device.
These patterns distribute the phases differently within the shared system. Bubbles and droplets create separated interfaces, slugs produce alternating regions, and stratified layers maintain distinct zones. Each arrangement changes interfacial area and phase contact, which influences how efficiently mass and heat move between phases. Recognizing the flow pattern therefore helps researchers relate operating conditions to system performance.
Flow rate, pressure, viscosity, density, and interfacial tension work together to determine phase distribution and interface dynamics. Changing one condition can shift the arrangement from one pattern to another, altering transport behavior. Evaluating these variables together is important when designing a system because the desired outcome may be efficient transfer, stable phase distribution, or reproducible handling of biological materials.
Researchers adjust the conditions that govern interface dynamics, including pressure, flow rate, viscosity, density, and interfacial tension. The objective is to produce a predictable arrangement of bubbles, droplets, slugs, or layers within the device. Such control can improve transport efficiency and reproducibility, particularly when biological processes depend on consistent reagent handling, cell culture conditions, or phase contact.
In microfluidic devices, controlled phase distributions can support reagent handling and transport through small-scale systems. In bioreactors, the same principles help manage phase contact and movement during biological processing. By controlling interface dynamics, engineers can create more consistent operating conditions, supporting reliable cell culture and improving the reproducibility of biological manufacturing.
Oxygenation systems use gas-liquid movement to support transfer between phases, while liquid-liquid extraction uses two immiscible liquid phases to move materials between separated fluids. In both applications, phase distribution and interface dynamics influence transport efficiency. Designing around these variables can help improve process performance and provide more reproducible handling of substances in bioengineering workflows.