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Tidal areas experience lots of oscillating, back-and-forth flow that builds up patterns in the sand below. In this experiment, researchers investigate a similar situation by filling a box with water and spherical particles, then shaking the box from side-to-side. (Image and video credit: T. van Overveld et al.)
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Ever wondered how whistles work? Depending on the type of whistle, there are a few different phenomena in play, but the most fundamental one is the oscillation of a fast-moving air stream. (Video and image credit: S. Mould)
When mammals breathe, air flows back and forth inside our lungs. But in birds that inhale and exhale get transformed into one-directional flow inside their lungs. (Image credit: bird - A. Mckie, others - Q. Nguyen et al.; research credit: Q. Nguyen et al.; via APS Physics; submitted by Kam-Yung Soh)
In the tiny realm of microfluidics, flows are, in general, completely laminar. That makes mixing a challenge.Β (Image, video, and research credit: A. Bertsch et al.)
Oscillatory Blood Flow in Bifurcating Capillaries | Chapter 12 | Theory and Applications of Mathematical Science Vol. 1
Oscillatory blood flow in bifurcating capillaries is examined. The governing nonlinear and coupled equations expressed in the form of the Boussinesq approximations are solved by the method of perturbation series expansions. Solutions for the concentration, temperature and velocity are obtained, and presented quantitatively using Malple 18 computational software. The results show that the rate of chemical reaction, Hartmann number (M2β€I.0), heat exchange parameter and Grashof number (Gr/Gcβ€I.0) tend to increase the velocity of the flow. The increase in the velocity structure has some attendant implications. In fact, it tends to increase the rate of transport of oxygen and nutrient-rich blood to the tissues, and this in turn enhances the physiological well-being of man.
Author(s) Details
Dr. W. I. A. Okuyade Department of Mathematics and Statistics, University of Port Harcourt, Port Harcourt, Nigeria.
View Books: http://bp.bookpi.org/index.php/bpi/catalog/book/117
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Blood Flow Through a One-point Stenosed Artery: Reynolds Number Effects | Chapter 02 | Theory and Applications of Mathematical Science Vol. 1
This paper studies the effects of Reynolds number on the oscillating flow in through a one-point stenosed artery. The nonlinear equations governing the flow are solved analytically by the method of perturbation series solutions. Expressions for the velocities and wall shear stress are obtained and analyzed graphically. It is found that increase in the Reynolds number increases the velocities and wall shear stress. Similarly, it is seen that a flow separation occurs in the radial velocity flow structure.
Author(s) Details
W. I. A. Okuyade Department of Mathematics, University of Port Harcourt, Port Harcourt, Nigeria.
Prof. T. M. Abbey Department of Physics, Applied Mathematics and Theoretical Physics Group, University of Port Harcourt, Port Harcourt, Nigeria.
View Books: http://bp.bookpi.org/index.php/bpi/catalog/book/117
Wave motion in a bay or near a beach can cause significant sediment transport. Individual granular particles, like sand, can be lifted by the passage of a single wave, but, over time, complex patterns form as the granular bottom surface shifts due to the waves. This video shows time-lapse footage of the ripples that form and move in submerged sand during many hours of wave motion. A slight imperfection in the surface causes a network of sand ripples to grow and spread. Once formed, those ripples shift and reform depending on changes in the wave conditions. (Video credit: T. Parron et al.)
