色偷偷男人的天堂a v

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      找靠譜儀器,就上儀器信息網~

      破漏層模型中速度場檢測方案(CCD相機) 【刊物發表】

      • 應用領域: 汽車及零部件
      • 檢測樣品: 汽車涂層和鍍層
      • 檢測項目:尺寸測量
      • 瀏覽次數:88 次
      • 下載次數:0 次
      • 發布時間:2019-12-16
      • 參考標準:暫無
      采用LaVision公司由4臺sCMOS型相機和DaVis8.2軟件平臺構成的大視場2D2C粒子成像測速系統,對破漏層模型的流程進行了初步的實驗分析。
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      • 參考報價

      Accurate and reliable experimental data of a sloshing-induced, rapidly-evolving spilling breaker, are used to understand the specific physics of this phenomenon and to partially evaluate a simplified analytical model by Brocchini and co-workers (Brocchini , 1996; Misra et al., 2004, 2006). Such model is based on a three-layer structure: an underlying potential flow, a thin, turbulent single-phase layer in the middle and a turbulent two-phase layer (air–water) on the upper part. The experiments were carried out by using a 3 m long, 0.6 m deep and 0.10 m wide tank, built in Plexiglas and forced through an hexapode system, this allowing for an high accuracy of the motion. Mean and turbulent kinematic quantities were measured
      using the Particle Image Velocimetry (PIV) technique. To ensure repeatability of the henomenon, a suitable breaker event was generated to occur during the first two oscillation cycles of the tank. The tank motion was suitably designed using a potential (HPC) and a Navier–Stokes solver. The latter, was useful to understand the dimension of the area of interest for the measurements. The evolution of the breaker is described in terms of both global and local properties. Wave height and steepness show that after an initial growth, the height immediately decays after peaking, while the wave steepness remains constant
      around 0.25. The evolution of the local properties, like vorticity and turbulence, vortical and turbulent flows displays the most interesting dynamics. Two main stages characterize such evolution. In stage (1), regarded as a ‘‘build-up’’ stage, vorticity and TKE rapidly reach their maximum intensity and longitudinal extension. During such stage the thickness of the single-phase turbulent region remains almost constant. Stage (2), is regarded as a ‘‘relaxation’’ stage, characterized by some significant flow pulsation till the wave attains a quasi-steady shape. In support to the analytical, three-layer model of Brocchini and co-workers it is demonstrated that the cross-flow profile of the mean streamwise velocity U inside the single-phase turbulent layer is well represented by a cubic polynomial. However, differently from available steadystate models the coefficient of the leading-order term is function of time: A = A(s, t). During stage (1) a fairly streamwise-uniform distribution of U is characterized by A(s, t) ≈ 1, while during stage (2) U is less uniform and A varies over a much larger range.

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      北京歐蘭科技發展有限公司

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      色偷偷男人的天堂a v

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