fraction void 中文意思是什麼

fraction void 解釋
空隙比
  • fraction : n. 1. 小部分，碎片，片斷。2. 一些，一點兒。3. 【化學】分餾，分層，分級。4. 【宗教】聖餐麵包分切式。5. 【數學】分數。
  • void : adj 1 空的，空虛的，沒人住的；（職位）空缺著的。2 沒有的，缺乏的 （of ）。3 〈詩〉無益的；【法律...
  1. The damage evolution law obtained from the model is related to the void volume fraction, the void shape, as well as triaxiality stress

    進而採用hill自治方法，得到了珠光體材料宏觀損傷本構描述，並發展了相應的數值方法與程序。
  2. Influences of initial damage on development of spalling damage have been indicated by analyzing the distribution of void number density, the cumulative percentage of void volume and the volume fraction of the different - seize voids

    通過分析孔洞數密度分佈、孔洞體積累積百分比、不同大小孔洞所佔體積份額的計算結果，指出初始損傷對損傷演化有直接影響。
  3. It is studied that the formation mechanism of taylor bubble and its control method in gas - liquid two - phase flow, which affects the pressure balance and mechanical driving efficiency in the flow of petroleum engineering. experiments show that the formation of taylor bubble in gas - liquid two - phase flow is due to the intensive congregation and amalgamation of small bubbles driven by void fraction waves and that the highly turbulent flow is able to restrain this formation. thus, the flow regime transition may be checked by increasing the flow turbulence and controlling the disturbed frequency

    對大管徑氣-液兩相流動中嚴重影響壓力平衡與機械驅動效率的段塞流生成機制和控制方法進行了研究，實驗證明段塞流的形成是由於空隙率波的大幅度增長使氣泡高度集中，並形成聚並所致。強湍流運動可以抑制taylor泡的形成。因此，通過強化湍流或控制擾動頻率可以對氣泡聚並起明顯的抑制作用。
  4. At first, bubble flow image is acquired using laser and incandescence lamp respectively as light source and using ccd. according to different optics - dispersion character, threshold segmentation method is proposed to identify gas from the gas - water flow, which make steadfast base for further calculate void fraction. the precision of threshold directly affect the calculate precision of void fraction

    文中分別採用激光片光源和影視燈照明，採用逐行掃描數字ccd攝像機獲取氣泡的流動圖像；根據氣泡和水對光的反射特性不同，提出採用閾值法識別圖像中的氣泡和水，從而為進一步計算摻氣濃度打下堅實的基礎。
  5. Characteristics of void fraction wave in horizontal bubbly flow with forced disturbance

    水平管泡狀流強制擾動下的空隙波特性
  6. Based on image process, a new method is proposed to measure void fraction without contact. this method breaks through the traditional point measure and sensor technology

    本文突破了點測量和機械探頭傳感器等傳統的摻氣濃度測量方法，採用非接觸測量法，首次將計算機圖像處理技術應用於水流摻氣濃度的實測。
  7. Based on the former result, the algorithm of two dimension and instantaneous void fraction is proposed and carry out through programming

    在上述工作的基礎上，本文給出了計算二維、瞬時摻氣濃度的演算法，並編程予以實現。
  8. The result shows that the value of void fraction is reliable and can reflect the real status. in this paper the error source is analyzed and discussed and the approach of how to advance measure precision is proposed, which has significant fact meaning

    文中還對採用圖像處理計算摻氣濃度過程中出現的誤差可能來源及提高測量精度的途徑進行了分析和探討，這對于提高摻氣濃度的計算精度具有重要意義。
  9. According to different optics - reverberation character of water and gas, this paper put forward how to identify gas from the gas - water digital image and how to f - urther calculate void fraction. the result shows that the method possesses relatively satisfactory precision

    基於水和氣體對光的反射特性的不同，提出了一種自動識別水氣二相流中的氣泡的數字圖像處理方法，並進一步給出計算二維、瞬時摻氣濃度場的演算法。
  10. The change of sound velocity with pressure, dryness degree, void - fraction, and phase - transition coefficient are analyzed. some important conclusions are derived

    分析了兩相流體中音速隨壓力、干度、汽隙率、相變系數等的變化關系，並從中得出了一些重要的結論。
  11. A detailed analysis on the characteristics of the solution of the void fraction matched model for the slug - to - annular flow pattern transition at microgravity condition, which is based upon the drift - flux raletionship of slug flow and the momentum balance relationship of smooth annular flow, is presented

    摘要對基於微重力條件下，氣液兩相彈狀流滑移流率關系和光滑環狀流動量平衡關系的彈環狀流轉換空隙率匹配模型的解的特徵，進行了深入分析。
  12. In this study the revised xtt formula are used to calculate void fraction correlation in the two - phase region of condenser and evaporator

    機組製冷t隨著冷凍水入口溫度的增加而增大，隨冷卻水溫度的升高而降低。
  13. It was found that the permeability of fibrous reinforcement mainly lied on the preform architecture. the distribution of void region and fiber volume fraction in the perform had important effects on permeability

    文中對lcm纖維增強材料預成型過程中常見的兩大纖維鋪敷缺陷? ?流道效應及剪切變形情況下的滲透特性進行了研究。
  14. Based on this slug flow unit model, the correlation for calculating average void fraction of slug flow in rolling tube was presented, and the calculations were agreed well with experimental data

    在此基礎上，給出搖擺狀態下彈狀流平均空泡份額計算關系式，並與實驗值進行比較，結果符合較好。
  15. Gas - liquid two - phase flow ; void fraction wave ; turbulent flow ; flow regime ; control

    氣-液兩相流空隙率波湍流運動流型控制
  16. Effects of the distribution of void fraction on the filter flowing characteristics of the ceramic filter elements

    孔隙率分佈對陶瓷過濾元件過濾特性的影響
  17. Study of refrigerant void fraction of domestic air - conditioner heat exchanger

    家用空調換熱器管內製冷劑空泡系數的研究
  18. Study of flow pattern discrimination in vertical gas - liquid two - phase flow based on the characteristics of void fraction waves

    基於空隙率波特性的垂直氣液兩相流流型判別研究
  19. Via refer to literature and theory study, three methods, namely ent, otsu, and iteration method are putted forward to calculate void fraction and via lots of experiment, three methods are compared and induced. in the end, otsu is recommend which it has satisfactory precision and speed

    經過大量的圖像分割實驗，對各種分割方法的分割效果和適用條件進行了比較和歸納，以計算精度和計算速度作為比較標準，作者認為類間方差法是計算閾值的最佳方法。
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