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関連する概念動画

Design Example: Creating a Hydraulic Model of a Dam Spillway01:21

Design Example: Creating a Hydraulic Model of a Dam Spillway

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Scaled hydraulic models of dam spillways provide a practical way to replicate and study the intricate flow dynamics of these structures. Often built to a 1:15 ratio, these models allow for observing critical water behavior, such as velocity distribution, flow patterns, and energy dissipation.
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Dimensional Analysis01:27

Dimensional Analysis

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Dimensional analysis is a valuable technique in fluid mechanics for simplifying complex problems by reducing them into dimensionless groups. These groups capture the essential relationships between the variables involved, allowing researchers and engineers to analyze fluid flow without dealing with each variable individually. This approach reduces the number of independent variables, allowing for easier analysis and better understanding of physical phenomena.
In fluid mechanics, dimensional...
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Typical Model Studies01:30

Typical Model Studies

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Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
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Laminar Flow01:27

Laminar Flow

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Laminar flow represents a smooth, orderly fluid motion where particles move along parallel paths, resulting in minimal mixing between layers. Streamlined particle paths characterize this flow regime and occur under conditions where viscous forces dominate over inertial forces. The distinction between laminar, transitional, and turbulent flow is primarily determined by the Reynolds number, a dimensionless quantity calculated as:
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Thermal Expansion01:22

Thermal Expansion

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The expansion of alcohol in a thermometer is one of many commonly encountered examples of thermal expansion, which is the change in size or volume of a given system as its temperature changes. The most visible example is the expansion of hot air. When air is heated, it expands and becomes less dense than the surrounding air, which then exerts an upward force on the hot air to, for example, make steam and smoke rise, and hot air balloons float. The same behavior happens in all liquids and gases,...
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Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

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Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
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Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns
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プールが小川を冷やすとき：到達規模の熱緩衝のための無次元フレームワーク

D Tonina1, A Bertagnoli1, A Hurst2

  • 1Center for Ecohydraulics Research, University of Idaho, Boise, ID, USA.

The Science of the total environment
|December 23, 2025
PubMed
まとめ
この要約は機械生成です。

河川のプールは水生生息地にとって非常に重要である。新しいフレームワークは、特に低流量時に、プール体積と流れの油圧が小川の温度緩衝にどのように影響するかを示しており、回復努力を支援している。

キーワード:
砂利底の川プール・川の結合プール残留プール体積川の形態川の回復小川の水温熱緩衝

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Measurements of Local Instantaneous Convective Heat Transfer in a Pipe - Single and Two-phase Flow
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科学分野:

  • 河川生態学
  • 環境流体力学
  • 水資源管理

背景:

  • プールは小川における重要な形態学的特徴であり、水生種に不可欠な生息地と過酷な条件からの保護を提供します。
  • 小川の水温は水生生態系に影響を与える重要な要因であり、熱ストレスは生物多様性に重大な脅威をもたらします。

研究 の 目的:

  • プール体積と流れの油圧を小川の水温の到達規模の熱緩衝に結び付ける物理ベースの無次元フレームワークを開発すること。
  • 河川プールの熱緩衝能力を定量化し、回復行動の効果を予測すること。

主な方法:

  • プールの成層と熱緩衝をシミュレートするために、過渡貯留モデルを開発しました。
  • 2つの無次元量、A*（熱緩衝の大きさ）とP*（川・プール結合の予測因子）を導入しました。
  • グランドロンデ川でフレームワークをテストし、回復前後の条件を比較しました。

主要な成果:

  • フレームワークは、熱緩衝と川・プール間の熱結合を定量化することに成功しました。
  • プールが日周温度変動を大幅に（最大80％）緩衝する閾値（P* ≈ 0.014）を特定しました。
  • 形態学的貯留、小川の流量、および油圧混合が、到達規模の温度変動を共同で制御することを実証しました。

結論:

  • 開発されたフレームワークは、自然の熱緩衝能力を評価するためのシンプルで転用可能なツールを提供します。
  • このフレームワークは、熱避難所を創出し、河川の熱ストレスを軽減するための回復行動を予測し、設計に情報を提供できます。
  • 河川の熱体制を管理するためには、川・プール間の熱結合を理解することが不可欠です。