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Related Concept Videos

Control Volume and System Representations01:16

Control Volume and System Representations

Two key frameworks are employed to analyze mass, energy, and momentum transfer: the control volume approach and the system approach. These frameworks offer different perspectives, depending on whether the focus is on a specific region in space (control volume approach) or a defined mass of fluid (system approach).
The control volume approach considers a stationary region in space through which fluid flows. This region is bounded by a control surface.  For instance, in the case of water flowing...
Introduction to Types of Flows01:23

Introduction to Types of Flows

Fluid flows are categorized by dimensionality and behavior, with one-dimensional flow being the simplest form, where properties like velocity and pressure change only along a single axis. Water moving through straight pipes exemplifies this flow type, as variations in other directions are minimal. One-dimensional analysis helps simplify understanding such flows, focusing solely on changes along the pipe's length.
Two-dimensional flow involves changes in both length and height, as seen in air...
Steady Flow of a Fluid Stream01:27

Steady Flow of a Fluid Stream

Consider a control volume, such as a pipe with solid boundaries, through which fluid flows and changes direction due to the impulse exerted by the resulting force from the pipe walls. In steady flow, the mass of fluid entering the control volume at a given time, t, with velocity v1, is equal to the mass leaving after infinitesimal time dt, with velocity v2.
During this process, the momentum of the fluid within the control volume remains constant over the time interval dt. By applying the...
Eulerian and Lagrangian Flow Descriptions01:22

Eulerian and Lagrangian Flow Descriptions

Fluid flow analysis is critical in many scientific and engineering disciplines, and two principal approaches are used to describe this flow: the Eulerian and Lagrangian methods. These methods offer different perspectives on monitoring and analyzing the motion of fluids, each with distinct advantages depending on the scenario.
The Eulerian method focuses on fixed points in space where fluid properties, such as velocity, pressure, and temperature, are observed as the fluid moves between these...
Streamlines, Streaklines, and Pathlines01:18

Streamlines, Streaklines, and Pathlines

A streamline represents the trajectory that is always tangent to the fluid's velocity vector at any given point. The velocity of a fluid particle is always directed along the streamline, ensuring the particle continuously follows the streamline's path. Streamlines are particularly useful for visualizing the overall direction of flow in a fluid system, and they provide an instantaneous representation of the flow's velocity field. In steady flow, where conditions do not change over time,...
Plane Potential Flows01:23

Plane Potential Flows

Plane potential flows simplify fluid motion by assuming the fluid to be irrotational and incompressible. These characteristics allow these flows to be described by a velocity potential function, ϕ, representing the flow speed in a given direction, and a stream function, ψ, that visualizes the flow path, both governed by Laplace's equation. These parameters help in estimating flow patterns, velocity distributions, and pressure fields around various hydraulic structures.
Uniform Flow
Uniform flow...

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Related Experiment Video

Updated: Jul 6, 2026

The Diffusion of Passive Tracers in Laminar Shear Flow
08:01

The Diffusion of Passive Tracers in Laminar Shear Flow

Published on: May 1, 2018

New perspectives on dispersed multiphase flows. Introduction.

I Eames1

  • 1University College London, Torrington Place, London WC1E 7JE, UK.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|March 20, 2008
PubMed
Summary

Dispersed multiphase flows, involving multiple phases like solid, liquid, or gas, are crucial in health physics, environmental science, and industry. This paper overviews key research and common challenges in this vital scientific area.

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Last Updated: Jul 6, 2026

The Diffusion of Passive Tracers in Laminar Shear Flow
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Published on: May 1, 2018

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Area of Science:

  • The study of dispersed multiphase flows encompasses the complex interactions between discrete phases (solid, liquid, gas) within a continuous fluid medium.

Background:

  • These flows are fundamental to numerous natural processes and industrial applications, impacting fields from environmental science to advanced technology.
  • Understanding multiphase flow dynamics is essential for optimizing processes in areas such as chemical engineering, energy production, and microelectromechanical systems (MEMS).

Discussion:

  • This Theme Issue provides a comprehensive overview of current research in dispersed multiphase flows.
  • Common challenges and recurring themes across various applications of multiphase flow are identified and discussed.

Key Insights:

  • The broad implications of multiphase flows span health physics, environmental modeling, and the development of novel technologies.
  • Research highlights the significance of these flows in everyday activities and industrial problem-solving.

Outlook:

  • Future research directions are suggested based on the identified common issues and emerging technological needs.
  • Continued investigation into multiphase flows promises advancements in scientific understanding and practical applications.