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Rapidly Varying Flow01:24

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Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
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Uniform depth channel flow keeps fluid depth consistent along channels such as irrigation canals. In natural channels, such as rivers, approximate uniform flow is often assumed. This condition occurs when the channel’s bottom slope matches the energy slope, balancing potential energy lost from gravity with head loss due to shear stress. This balance prevents depth changes along the channel length, resulting in a steady, uniform flow.Uniform flow in open channels with a constant cross-section...
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Gradually Varying Flow01:29

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Gradually varying flow (GVF) in open channels describes situations where water depth changes slowly along the channel due to factors like non-uniform bed slope, channel shape variations, or obstructions. This flow type occurs when the depth adjusts gradually to balance gravitational forces, shear forces, and energy requirements, resulting in a low rate of depth change.Characteristics of Gradually Varying FlowGVF is commonly observed in natural streams, rivers, and canals, where flow depth...
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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.
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Turbulent flow is characterized by unpredictable fluctuations in velocity and pressure, which result in a chaotic fluid movement distinct from the orderly patterns of laminar flow. While laminar flow is governed by smooth, parallel layers with minimal mixing, turbulent flow exhibits highly irregular, three-dimensional patterns. This behavior arises due to instabilities in the fluid's velocity profile, and amplifies as the flow velocity increases. Minor disturbances, known as turbulent...
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The study of external flow is essential for creating structures and objects that interact efficiently and safely with moving fluids, such as air or water. When a body is immersed in a flowing fluid, it experiences two primary forces: drag, which opposes motion along the flow direction, and lift, which acts perpendicular to the flow. The shape, size, and orientation of the object influence these forces.Streamlined and Blunt Bodies in External FlowObjects in fluid flow are classified as...
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Burst intensification by singularity emitting radiation in multi-stream flows.

A S Pirozhkov1, T Zh Esirkepov2, T A Pikuz3,4

  • 1Kansai Photon Science Institute, National Institutes for Quantum and Radiological Science and Technology, 8-1-7 Umemidai, Kizugawa-city, Kyoto, 619-0215, Japan. pirozhkov.alexander@qst.go.jp.

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Scientists demonstrate Burst Intensification by Singularity Emitting Radiation (BISER), creating nano-scale coherent X-ray sources. This breakthrough offers a new class of bright laboratory emitters with broad scientific applications.

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Area of Science:

  • Physics
  • Plasma Physics
  • Optics

Background:

  • Coherent emission sources are crucial for advanced scientific research.
  • Existing methods for generating bright, localized radiation have limitations.

Purpose of the Study:

  • To propose and demonstrate the Burst Intensification by Singularity Emitting Radiation (BISER) phenomenon.
  • To establish novel, nano-scale coherent X-ray sources in laser-induced plasma.

Main Methods:

  • Theoretical proposal of BISER based on constructive interference in multi-stream flows.
  • Experimental observation of nano-scale coherent X-ray sources in laser plasma.
  • Computational simulations to analyze emitted pulse characteristics.

Main Results:

  • Direct observation of nano-scale coherent X-ray sources.
  • Measured emission energy up to ~100 nJ (10^10 photons) in the 60-100 eV range.
  • Simulations indicate emission of attosecond X-ray pulse trains.

Conclusions:

  • BISER establishes a new class of bright laboratory sources for electromagnetic radiation.
  • The BISER framework is applicable to various travelling waves (electromagnetic, gravitational, acoustic).
  • This provides a novel approach for creating new emitters and interpreting scientific observations.