prandtl 中文意思是什麼

prandtl 解釋
普蘭特爾
  1. Among his many contributions to the field of turbulent thermal convection, his work in high prandtl number heat flux measurement played a pivotal role in settling a long - standing issue in the field

    他在湍流熱對流領域中有著眾多的貢獻，尤其是關于高普朗德數下湍流傳熱方面的實驗研究，此研究對于解決這個領域中長期未決的問題起了極為關鍵的作用。
  2. The paper proposes that the damage surface adopt curvilinear slip - surface, based on analyzing several normal models of soil pressure, and a new method of calculation soil pressure of brace structure of deep foundation - pit is derivated based on prandtl theory under this assumption. moreover contrasting against computational method of the classics soil pressure, better effect is acquired in the actual application

    本文在對幾種常用的土壓力模型進行分析比較的基礎上，提出了採用曲線滑動面作為破壞面，並在此假設下根據普朗特爾理論推導出一種計算深基坑支護結構中土壓力的新方法，並與經典土壓力計算方法作了比較，在實際應用中也取得了較好的效果。
  3. Actually, n - s equation has three unknown functions u, v, p and three equations, now prandtl boundary layer equation has two unknown functions w, vand two equations only, and viscosity terms has partly reduced

    原來有三個未知函u ， v ， p及三個方程，現在只有兩個未知函數u ， v及兩個方程，且粘性項也少了一些，這些都是簡化的地方。
  4. Magnetic prandtl number

    磁普朗特數
  5. Based on prandtl ' s momentum transportation, this paper calculates in detail the physical quantities such as eddy viscosities, and ratio of eddy viscosity to motion viscosity, total stresses with respect to relative position in three regions of viscous sub - layer, buffer layer, and main turbulent stream for non - newtonian fluid flowing turbulently in ducts, which according to karman ' s three layer models and measurement of fluid parameters in evaluation apparatus, discusses the influence of polymer drag reduction on flowing properties of non - newton fluid, analyzes quantitatively principle of turbulent reduction phenomenon and condition of increasing reduction rate

    摘要以普蘭德動量傳遞理論為基礎，按照卡門的三層模型，通過室內模擬環道用0號柴油及加入減阻劑在圓管內的流動參數的測定，計算了非牛頓型流體管內湍流邊界層的層流內層、過渡層、湍流中心的渦流粘度，渦流粘度與運動粘度比、總應力隨相對位置的變化等定量參數，探討了高分子減阻劑對非牛頓流體流動特性的影響，對湍流減阻現象的機理與增大減阻率的條件進行了定量分析。
  6. Author considers that munk - anderson ' s modification is not suitable to simulate the buoyant flow in reservoir, and suggests the turbulent prandtl number as the constant of 0. 85 in the water temperature model of reservoir

    本文認為該修正模型並不適用於水庫浮力流的模擬，建議在大型深水庫水溫模型中溫度普朗特數採用常值0 . 85 。
  7. This paper has established a class of mathematics model about prandtl boundary layer problem. compare to navier - stokes equation, prandtl boundary layer equation has important simplicity and easier

    普朗特邊界層方程和納維? ?斯托克斯方程相比，有了重大的簡化。
  8. Scaling analysis of unsteady natural convection flow of a fluid with low prandtl number

    數流體非穩態自然對流流動的標度分析
  9. Prandtl lifting line theory

    普朗特升力線理論
  10. Prandtl - reuss relation

    羅伊斯關系
  11. The influence of difference in temperature, reynolds number of film and prandtl number to the heat transfer performance on the evaporation side was discussed via the uniform wall temperature experiments. by analyzing above influence factors, the character of umbrella - plate evaporator which is fit for evaporation under little difference in temperature and fit for evaporating heat sensitivity materiel could be obtained

    通過恆壁溫實驗探討了傳熱溫差、液膜雷諾數、普朗特數這些主要因素對傘板式降膜蒸發器傳熱性能的影響，通過對以上影響因素的分析，得出了此種結構的蒸發器特別適用於小溫差情況下的蒸發，而且特別適用於熱敏性物料的蒸發等特性。
  12. Prandtl torsion function

    普朗特扭轉函數
  13. Prandtl mixing length

    普朗特混合長度
  14. The algebraic b - l eddy model, prandtl mixing length model as well as arrhenius finite speed rate chemical reaction combustion model is introduced to above cold - state model

    引入baldwin - lomax代數方程模型、用於剪切層的普朗特混合長度湍流模型和阿累尼烏斯有限速率化學反應燃燒模型。
  15. A new coefficient of prandtl ' s relation was obtained from the experimental data. compared with three conventional relations of friction factor, the range of reynolds number was extended

    在實驗結果的基礎上提出了普朗特摩擦系數關系式的新系數，與常用的摩擦系數關系式相比，擴大了普朗特摩擦系數關系式的雷諾數應用范圍。
  16. This paper carry out experimental study of the heat transfer and flow resistance characteristics of high prandtl number fluid in 3 - d internally crossing - finned tubes with cross - experiment design method. use oil as work media

    本文以未使用過的潤滑油為工質，用正交試驗設計方法，對高pr數流體在肋叉排列三維內肋管中的傳熱和流阻特性進行了實驗研究。
  17. With the helium as the working gas, we attained 119. 7k the refrigeration temperature of the pulse tube. this is the first time that it enters the cryogenic field using the thermocaoustic engine in china. 2 ) the application of binary noble gas on tadptr after the discuss of the possibility of applying binary noble gas on tadptr, we give the way to calculate the prandtl number of the binary noble gas

    混合工質應用於熱聲驅動的脈管製冷機對惰性氣體二元混合工質在熱聲機械中的可能應用進行了探討，給出了混合工質的普朗特數等參數的計算方法，並進行了採用氦-氬混合工質的熱聲驅動脈管製冷機的實驗研究。
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