natural convection 中文意思是什麼

natural convection 解釋
天然對流
  • natural : adj 1 自然界的；關于自然界的。2 天然的；未開墾的；野生的。3 固有的 生來的 天賦的（opp acquired）...
  • convection : n. 1. 傳送。2. 【物理學】運流，環流；【氣象學】對流，上升氣流。
  1. Combined heat and mass transfer by natural convection which is caused by heat and mass diffusion can be seen in nature and some processes of industry, such as evaporation and desiccation. these processes relate to aeronautics, hydraulics, mechanics, chemical engineering, oceanography and aerography

    熱及物質擴散引起的傳熱傳質復合自然對流常見于自然界和蒸發、乾燥等工業過程，涉及到航空、水利、機械、化工、海洋、氣象等諸多領域，其流體力學和傳質傳熱特性一直是人們研究的重點。
  2. Convection can be of two types: natural convection and forced convection.

    對流可分為兩類，即自然對流和強制對流。
  3. In this paper, the analytical method of linear stability has been applied to establish the marginal stability criterion of natural convection in porous medium, after considering the action of gravity, centrifugal and coriolis forces together in centrifugal force field

    理論研究的結果表明，當離心力與溫度梯度同方向時，只要滿足ra > 7 . 81 2或ra0 > 4 2 ，多孔介質中即可發生離心力、重力與哥氏力共同驅動的自然對流。
  4. Thermal analysis and design of natural convection pcr chip

    晶元的熱分析與設計
  5. The instability in the natural convection boundary layer initiates with the buoyancy eigenmode and develops into non - linear stage with the turbulization of the buoyancy eigenmode. in the mean time, the invisid eigenmode at the inflexion point appears and begins to increase at the outer layer. experimental results show that the turbulent layer near the maximum velocity point can be detected while the reformed grashof number

    自然對流邊界層的穩定性由浮力振型失穩開始，並隨著浮力振型的湍流化進入非線性階段，與此同時，無粘性振型在外層開始失穩。實驗結果表明，修正格拉斯霍夫數grashof
  6. A two - dimensional double diffusive laminar natural convection in rectangular enclosure is detailed analyzed. the results show that when the thermal and solutal buoyancies aid each other, the airflow consists of one main cellular structure and is steady, regardless of the relative strength variation between the heat and pollutant sources. there are multiple flow structures, however, according to the relative strength when the buoyancies opposing each other

    模擬結果表明雙擴散自然對流系統的空氣流動與傳熱傳質特性完全是由離散熱源與污染源浮升力之間的相互作用關系訣定的：當離散熱源與污染源浮升力協同作用時，自然對流呈比較穩定的單一流動結構；而當熱源與污染源浮升力對抗作用時，自然對流系統隨它們之間強度變化呈現出多種流動狀態。
  7. Between glass - cover board and endothermic board, honeycomb is placed, which can eliminate heat loss caused by air natural convection and greatly reduce heat loss caused by radiation, and hence a better transfer heat efficiency

    而在透明玻璃蓋板和吸熱板之間放置蜂窩結構，基本上能消除吸收表面和蓋板之間的空氣自然對流熱損失，並可大大降低輻射損失，顯著提高集熱器的熱轉換效率。
  8. Origin of turbulence in natural convection boundary layer

    自然對流邊界層中湍流的發生
  9. Steady state thermal analysis under natural convection boundary condition was performed. both the temperature distribution and the induced mechanical stress were calculated in this simulation. high stress area was found and the potential reasons which can cause packaging to fail were also discussed

    具體內容包括: 1 .建立一款疊層csp / bga封裝的三維實體有限元模型，求解自然對流條件下的穩態溫度場分佈，並在此基礎上進行穩態熱應力和熱應變分析，找出由於溫度梯度在封裝內部引起的高熱應力區域，分析其可能造成的失效結果。
  10. Natural convection boiling heat transfer in enhanced heat transfer tubes

    強化傳熱管內的自然對流沸騰換熱
  11. Size effect of forces on natural convection in a square cavity

    方腔自然對流中力的尺度效應
  12. Warm air circulation natural convection, time and energy saving

    溫風循環自然對流烘乾省時省電
  13. Adopts warm air circulation natural convection drying, time and energy saving

    采溫風循環自然對流烘乾，省時省電
  14. Natural convection method, energy and time saving, excellent drying effect

    自然對流方式，省時省電，烘乾後效果佳
  15. 3. algebraically explicit analytical solutions of two - buoyancy natural convection in porous media applying the approach of separating variables with addition, the thesis derives three sets of simple and clear algebraically explicit analytical equations describing the natural convection in porous media with both temperature and concentration gradients. besides the theoretical meaning, they are more valuable for be the benchmark solutions to check and improve the computational fluid dynamics and computational heat and mass transfer

    三、多孔介質中溫度與濃度梯度耦合自然對流基本方程的代數顯式解析解本論文對王補宣院士等給出的反映多孔介質中溫度與濃度耦合自然對流的五元非線性聯立偏微分方程，利用加法分離變量法，導出了三套比較簡明的代數顯式解析解。
  16. 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
  17. The characteristic of combined heat and mass transfer by natural convection has been the focus of researches for a long time. numerical analysis is conducted for combined heat transfer and mass transfer by natural convection on inclined surface. effects of the inclination angle and the ratio of buoyancies due to heat diffusion and mass diffusion on fluid flow and heat and mass transfer characteristics have been investigated for pr = 0. 7 and sc = 0. 05 - 5. 0

    本文採用數值計算方法研究了傾斜平面上的傳熱傳質復合自然對流，求解了動量、能量及質量的完整方程，考察了熱質擴散共存時傾斜平面上的流動和傳熱特性，著重分析了熱浮力及物質擴散浮力之比b和傾斜角度對流體流動和傳熱傳質特性的影響。
  18. This may be done by ensuring that both leads are of equal length to equalize thermal conduction through them, by making any airflow ( whether forced or natural convection ) normal to the resistor body, and by taking care that both ends of the resistor are the same distance from any heat source on the pcb

    例如，讓電阻兩端的引腳長度相等以使熱阻相等；讓冷卻氣流（自然風冷或強制風冷）均勻地吹到電阻上；或者讓電阻兩端與pcb上的熱源的距離相等。
  19. The approximate analytical solution of melting process within a spherical enclosure is to presented by contacting heat transfer. a numerical model describing the melting process is presented by considering the difference of the solid - liquid density and natural convection

    在所建立的模型中考慮了固相與液相的密度差和自然對流的影響，得出了各個時刻液膜厚度的分佈、融化速率和傳熟量等計算結果。
  20. The direct - inserted solar energy water heater can be used independently for household life, and connected in series or in parallel into a collective hot water supply system for unit such as factory, mine, school, armed forces, guest house, hotel etc. where volume of hot water is needed not so much. both the full glass vacuum heat collection tube which takes natural convection of heat exchange and the heat pipe with superconducting medium have passed the ice and snow test in cold area, and have been recognized by customers in various kinds of climate conditions

    這種系統包括熱管真空管全玻璃真空管，熱保溫水箱，循環網路系統，循環泵和控制器系統，其工作原理：建立於定點溫度的基礎上，介於集熱器和熱保溫水箱間的循環泵系統強制循環，集熱管吸收的太陽能不斷的轉化為熱能，使水箱里的水不斷加熱。
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