convection in air 中文意思是什麼

convection in air 解釋
氣體對流器
  • convection : n. 1. 傳送。2. 【物理學】運流，環流；【氣象學】對流，上升氣流。
  • in : adv 1 朝里，向內，在內。 A coat with a furry side in有皮裡子的外衣。 Come in please 請進來。 The ...
  • air : n 1 空氣，大氣。2 天空，空中。3 微風，和風。4 態度，樣子，風度，氣派；〈pl 〉高傲的架子。5 傳播，...
  1. The research object of this thesis is a chip - array that is fixed on one of printed circuit boards ( pcb ), which are located in a forced air field ( forced convection ) in an electronic case ; and from the essential equations of airflow we can deduce the mathematical model of the turbulent flow ; then we can establish the finite element algorithm and apply the fe software to work out the equations of turbulent flow, finally we can use the software to display and analyse the field of flow and temperature

    本文以處于強迫空氣對流流場中的某pcb板及其板上的電子元件陣列作為研究對象，推導了紊流流場的數學模型，並建立了相應的有限元求解格式，應用有限元法分析軟體對該系統的紊流流場和溫度場進行了模擬分析：解算出pcb板上各電子元件的溫度分佈；並提出了用於求解系統風道特性曲線的cfd方法。
  2. After thermodynamic calculation on several operation conditions of the furnace, cold - state flow and resistance mensuration, the combustion of the tubular - furnace hearth was changed into swirl and addition of radiate cylinder and oxygen content detection minish 1. 25 surplus air to less than 1. 15, improving the combustion condition and convection and radiate heat transfer efficacy, resuling in reducing the waste - gas temperature 45, decreasing exhaust gas loss, and saving fuel by 6 %

    摘要通過對加熱爐幾種工況進行熱力計算、冷態試驗的流場分佈及阻力測定和熱態試驗的爐膛溫度場分佈及管壁溫度等參數的測定，確定將管式加熱爐爐膛內直流燃燒改為旋流場燃燒和增加輻射筒，增設煙氣含氧量分析，可以將燃燒的過剩空氣系數從1 . 35減小到1 . 15以下，極好地改善爐膛內的燃燒狀況和對流輻射傳熱效果，從而降低排煙溫度45 ，減少加熱爐排煙損失，節約了煤氣量6 %以上。
  3. The blade inner channel cooling is a complex convection - conduction coupling problem. this thesis build a three - dimension. compressible turbulence model, and give a general solve method. with the geometrical model of the glossily rectangle straight channel, the rectangle straight channel with in - line arrays disturb plates, the rectangle straight channel with staggered arrays disturb plates, the rectangle straight channel with slant disturb plates, this thesis compute the flow and heat transfer condition when the cold air path though these channels, and gain the temperature field, pressure field, velocity filed, in addition. this thesis also analyze the influence of the different channel height, the different channel materials, the different channels, and gain the function relation between he nusselt number, friction factor and reynolds number. this thesis is emphasis on the new heat transfer enhancement structure, that is, disturb plates, with the comparison with the glossily channel and channel with pin fins, the heat transfer enhancement effect of the former is better, and the conclusion can be used in the design of aircraft blade

    葉片內部通道冷卻是一個復雜的對流?導熱耦合傳熱問題，本文在分析葉片內部通道冷卻的流動與傳熱情況的基礎上，建立了三維、可壓縮紊流的物理模型，得到了通用的求解辦法；利用不帶擾流片的矩形直通道、帶順排擾流片矩形直通道、帶叉排擾流片、帶傾斜擾流片的矩形直通道的幾何模型，計算了冷卻空氣通過這幾種通道時的流動與換熱情況，得到了各種不同情況下計算區域的溫度場、壓力場、速度場；在此基礎上分析了不同的通道高度、不同的葉片通道材質對葉片內部通道冷卻的影響，並整理得到了各種通道形式下，努謝爾數和阻力因子與雷諾數的函數關系；本文重點研究了新型的葉片內部通道冷卻強化傳熱措施?帶擾流片的內部冷卻通道的強化傳熱效果，通過與光滑矩形直通道、帶針肋通道的冷卻效果的比較，表明了這種新型鮚構的優勢，對于葉片內部通道冷卻結構的設計可以起到指導的作用。
  4. The occurrence of cirrocumulus clouds indicates the distant presence of a convergent zone such as a pressure tough or a cyclone in lower levels ; or a frontal zone where cold air meets moist warm air. vigorous convection and lifting motion bring water vapour up in the sky where the water vapour sublimes into ice crystals, forming the high clouds

    卷積雲的出現顯示遠處地方低層有一強輻合帶如低壓槽或氣旋或鋒面即暖濕空氣碰到冷氣團，向上爬升的交界面形成，強烈的對流和抬升運動將水汽帶到高空，在那裡水汽直接升華變為冰晶而形成高層雲。
  5. Then a one - dimensional unsteady incompressible flow with moving pollutant source model was proposed. the continuity equation, momentum equation and convection - diffusion equation were discredited using finite volume scheme. thus a software for predicting the air velocity and pollutant in railway double track tunnels was developed

    接著，根據雙線鐵路隧道運營通風的特點，建立了一維不可壓縮非恆定流和流動污染源的物理模型以及山相應的連續性方程、動量方程和對流擴散方程構成的數學模型；在此基礎上，利用數值計算方法，編制了一套雙線鐵路隧道運營通風的數值計算程序。
  6. Abstract : in the internal circulating fluidized bed, there exist the moving zone, fluidizing zone and heat transferring zone with different fluidized air velocities. the convection heat transfer coefficient of immersed tube in the heat transferring zone is impacted by the velocity of the moving zone nearby and its data and change trend are obviously different with those of the common bubbling bed. the maximum heat transfer coefficient is evidently higher than that of the bubbling bed. as the bed materials have not been fluidized in the heat transfer zone, the coefficient has increased highly. the curve of that changes gently, feasilble to control the combustion intensity in the fluidizing zone

    文摘:垃圾焚燒系統中，內旋流流化床存在不同布風速度的移動區、流動區和換熱區，處于換熱區的埋管的對流換熱系數受附近流動區氣流參數的影響，其變化趨勢及數值大小與普通鼓泡型流化床之間有明顯不同：最大的對流換熱系數明顯高於鼓泡床；換熱區尚未流化時，對流換熱系數已經大幅提高；整條換熱曲線的變化比較平緩，易於流化床濃相床內換熱。
  7. Abstract : the in servie tubular heaters built early in refineries and chemical plans have low thermal load and low heat efficiency, therefore measures for technical reform are offered, including ( 1 ) enlarging the surface area of convection tubes to increase the thermal load of rhe convection section ; ( 2 ) increasign the heat interchanging area of radiant tubes ; ( 3 ) changing the height of the chimney ; ( 4 ) using new burner with forced air supply to increase calorific capacityu ; ( 5 ) adding air preheater between the convection section and chimney to enhence the temperature of the air entering the furnace ; ( 6 ) adopting high temperature radiant coating to improve the effect of radiant heat interchanging

    文摘:針對早期建造的煉油廠和化工廠在役管式加熱爐熱負荷和熱效率低的狀況，提出了若干技術改造措施包括，增大對流管表面積以增大對流段的熱負荷；增加輻射管的換熱面積；修正煙囪高度；換用新型燃燒器，變自然通風為強制供風，以增大燃燒器的發熱量，減小過剩空氣系數，節省燃料2 % 3 % ；在對流段和煙囪之間增設空氣預熱器以提高空氣入爐溫度；採用高溫輻射塗料增強輻射換熱效果，從而增加熱源對爐壁的輻射傳熱量和爐管的傳熱量等。
  8. The in servie tubular heaters built early in refineries and chemical plans have low thermal load and low heat efficiency, therefore measures for technical reform are offered, including ( 1 ) enlarging the surface area of convection tubes to increase the thermal load of rhe convection section ; ( 2 ) increasign the heat interchanging area of radiant tubes ; ( 3 ) changing the height of the chimney ; ( 4 ) using new burner with forced air supply to increase calorific capacityu ; ( 5 ) adding air preheater between the convection section and chimney to enhence the temperature of the air entering the furnace ; ( 6 ) adopting high temperature radiant coating to improve the effect of radiant heat interchanging

    針對早期建造的煉油廠和化工廠在役管式加熱爐熱負荷和熱效率低的狀況，提出了若干技術改造措施包括，增大對流管表面積以增大對流段的熱負荷；增加輻射管的換熱面積；修正煙囪高度；換用新型燃燒器，變自然通風為強制供風，以增大燃燒器的發熱量，減小過剩空氣系數，節省燃料2 % 3 % ；在對流段和煙囪之間增設空氣預熱器以提高空氣入爐溫度；採用高溫輻射塗料增強輻射換熱效果，從而增加熱源對爐壁的輻射傳熱量和爐管的傳熱量等。
  9. The experimental results indicate that when the air flow rate is determined, the key problem for energy saving is how to keep the indoor thermal comfort at a suitable level and reduce the difference between the internal and external temperature of the room. a formula is gained for calculating the critical values of air exchange rate. when ventilating rate is greater than the value, radiating heating is the better way for energy saving, or else, convection method in heating is more suitable

    實測還指出，當通風量一定時，如何保證人體熱舒適度不變而減少室內外氣溫差將成為大通風量房間節約採暖能耗的關鍵，本文結合圍護結構傳熱機理，在對三種方式的能耗狀況進行理論分析的基礎上，提出了換氣次數的節能臨界值，若換氣次數高於此值，則輻射供暖是較好的選擇，否則，散熱器供暖是較好的方法。
  10. In the simplified mathematical modeling, fins are taken as equivalent solid layer with nonisotropic thermal conductivity, and heat convection between fins and cooling air is considered as internal source

    對2種飛機環控系統電子設備冷卻用冷板進行了實驗研究，測量了不同雷諾數、不同熱源分佈情況下冷板的表面溫度分佈。
  11. In day time, especially in mid - summer, the ground heats up under the sun and spurs convection in the air. this lifts moisture up the atmosphere aloft, which gradually develops into isolated, floating cumulus

    在日間，特別是在盛夏時候，地面吸收大量太陽的熱量，引起大氣對流運動，將水氣帶上上空，慢慢形成孤立懸浮的積雲。
  12. Simulation of heat and mass transfer in unsaturated soil under solar radiation and air convection

    大氣對流下未飽和土壤中熱質遷移過程的實時模擬研究
  13. According to thermal comfort theory, adopting radiation directly acting to human ' s body, people can also feel comfortable even if indoor air temperature is relatively higher in summer and relatively lower in winter than that of convection heat - supply which means that it is evident energy - saving as to the traditional convection heat transfer

    根據熱舒適指標理論，採用輻射方式直接作用於人體，在室內空氣溫度較高（夏季供冷工況） 、較低（冬季供熱工況）的條件下，仍可以使人達到熱舒適，與傳統的對流傳熱方式相比具有明顯的節能性。
  14. With the arrival of the front, the relatively warm air being less dense became lifted by the advancing cold air. the upward motion resulted in convection, eventually producing thunderstorms over the western coast of guangdong, the new territories and lantau ( figs

    當冷鋒抵達時，推進中的冷空氣使密度較低的暖空氣向上抬升，繼而觸發對流活動，其後為廣東西部沿岸、新界及大嶼山帶來雷暴（圖2至4 ） 。
  15. With the arrival of the front, the relatively warm air being less dense became lifted by the advancing cold air. the upward motion resulted in convection, eventually producing thunderstorms over the western coast of guangdong, the new territories and lantau figs. 2 to 4

    當冷鋒抵達時，推進中的冷空氣使密度較低的暖空氣向上抬升，繼而觸發對流活動，其後為廣東西部沿岸新界及大嶼山帶來雷暴圖2至4 。
  16. The third part is the analysis to uprightness instability condition. it is made that there was the ascending air current about shenyang, the hailstone forming height is between 700hpa and 400hpa, die water vapor coagulating height is between 950hpa and 900hpa from the simulated tlogp evolvement chart. cape is in favor of severe convection development

    干濕空氣間強的風垂直切變是此次冰雹強對流爆發的又一個重要觸發機制，強冷空氣到達地面強迫暖濕空氣抬升，致使對流層中低層出現強風垂直切變，強風垂直切變對強對流的發生和發展起到了非常重要的作用。
  17. Analyze 1000hpa stream field evolvement chart, a southwest - northeast combine strap was forming in liaoning province by southwest air current and northwest air current. level combine induce the combine strap cyclone bend, whorl degree intension increase. boundary layer friction combine bring to ascend and come into being small measure cumulus convection pyrogenation

    高低空急流的耦合是此次強對流爆發的重要觸發機制，高低空急流在耦合的過程中， 300hpa高空急流強度超過50m s ， 850hpa低空急流強度超過20m s ，而且低空急流與高空急流剛好在高空急流出口區的位置上相交，對強對流爆發有利。
  18. In this paper, some factors influencing its temperature field have been synthetically analyzed including the ambient temperature, solar radiation, air convection and sky radiation, ground radiation and so on. the hourly temperature of the roof and walls of the tested building in summer and winter was calculated with the finite element software - ansys. the results from calculation had well consistent with the experimental results

    本文結合試點建築溫度場監測結果，理論分析了影響建築物溫度場的各種因素，包括：大氣溫度、太陽輻射、空氣對流以及天空輻射、地表環境輻射、建築物自身輻射等因素，總結了實用計算公式，採用有限元數值方法，藉助有限元軟體ansys進行了屋面和各方位墻體在自然環境作用下的溫度場模擬分析，與實測結果比較吻合。
  19. In addition, the inner surface temperature with the effect of air convection in the detect is different from the one in terms of considering air heat transfer in the defect as conduction and the effect caused by radiation can be neglected

    考慮缺陷內空氣對流換熱的影響下得出的溫度與純導熱條件下得出的溫度存在較大誤差，輻射的影響可以忽略不計。
  20. As new terminal equipment in air - conditioning, the mechanism of radiant floor is heating or cooling the room mainly through radiation and convection

    輻射地板作為一種新型空調末端設備，主要利用輻射和對流形式對房間供冷或供暖；與常規空調送風相比，具有熱舒適性好、節能、美觀、對環境影響小等優點。
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