LES cooperated with the second order full extension ETG finite element method is applied to simulate three typical problems concerned with convection heat transfer with sufficient experimental data. By comparing the numerical results with the experimental results, LES is proved to be of better accuracy and stability when it is used to solve the problems concerned with convection heat transfer. The time history of the flow field and temperature field can be reflected better, and abundant information of the fields can be obtained. Furthermore the details of the change in the vortex structure can be captured.

應用大渦模擬與二階全展開ETG有限元離散格式相結合的方法對具有實驗基礎的三個典型對流換熱問題進行了數(shù)值模擬，并將模擬結果與相應的實驗結果進行對比97人人操.com，證明了大渦模擬應用于對流換熱問題中具有較高的穩(wěn)定性和精度，能夠較好地反映流場和溫度場的時變過程，提供豐富的溫度場和流場信息88888视频搞基，捕捉流場中旋渦結構的變化細節(jié)，尤其適合于邊界形狀復雜的區(qū)段內含有大尺度各向異性渦的流動和換熱問題的計算8x8ⅹcom永久免费视频。

The special material is adopted to enhance the radiation and heat conduction heat transfer, and the cellular strengthener whose surface area is bigger can enhance the convection heat transfer.

其采用高導熱非金屬材料為主體材質達到增強導熱及輻射的目的18岁禁止入内网站；通過采用蜂窩體形式達到增大比表面積，從而增強對流換熱的目的久久婷婷国产麻豆91天堂。

In the process of developing the two-dimensional mathematical model of the human thermoregulation system, convection heat transfer between blood and tissue is studied, the methods for calculating blood convection heat transfer are developed.

在建立和發(fā)展二維人體熱調節(jié)系統(tǒng)數(shù)學模型的過程中自拍偷拍第9页，本文對血液與人體組織間的對流換熱進行了分類研究，發(fā)展了不同類型血液對流換熱的計算方法亚洲福利日韩看片无码。

In this paper a two-dimension square model of convection heat transfer is adopted and Field Coordination Equation is verified by comparing the heat transfer efficiency of optimal velocity filed and other flow fields.

過增元11欧美一级生性活，2指出速度矢量與熱流之間的夾角是影響對流換熱整體性能的一個重要因素久操手机在线网站播放，并闡述了對流換熱場協(xié)同的基本概念：對流換熱強化要求速度場和溫度場之間相互協(xié)同，即彼此存在著最為合理的空間分布欧美成年黄网站色高清视频。

Helically finned tube ; convection heat transfer ; local heat transfer

螺旋肋片管草国产在线视频；對流傳熱；局部傳熱

Through this material one could setup an overall impression of the study content and the study method.In order to investigate the basic heat transfer characteristics of regeneratively cooled scramjet, in the second chapter, one dimensional heat transfer model of regeneratively cooled scramjet was developed. In this model, N-R correlations were used to describe hot gas-side and coolant-side convection heat transfer. Simple model of gas properties was also used.

為了初步了解超燃沖壓發(fā)動機再生冷卻傳熱的基本特征高清无码性爱视频在线观看，第二章建立了超燃沖壓發(fā)動機再生冷卻的一維傳熱數(shù)理模型亚洲色图熟熟，采用了準則關系式描述燃氣側和冷卻劑側的對流換熱，采用了簡化的燃氣物性模型一级做a爰片久久毛片A片高潮，并對襯層材料欧美熟妇性爱A片在线A片视频、襯層厚度和冷卻劑流量進行了參數(shù)研究。

And has brilliant prospect due to its simple structure, good economy and energy saving performance.Based on the full scale passive solar experimental building in DUT, in which the researcher carried experiment as the main method and the CFD simulation as the minor method, the research focuses on passive ventilation formed by the Trombe wall. This paper analyzed the indoor thermo and humidity performance of passive solar building with Trombe wall, and the different ventilation patterns in different seasons, revealing the role of passive ventilation in improving indoor environment. Also the paper researched the characteristics of passive ventilation on air flow and heat transfer mechanicsms, and put forward the best control and adjusting method. Meanwhile the paper gained an empiric formula in use of calculating the natural convection heat transfer and found the key factor of influing the indoor environment.

本研究以被動式采暖降溫技術為依托日韩精品合集第一页免费观看，采用實驗和CFD數(shù)值模擬的研究方法毛茸茸婊子，重點研究了新型被動式太陽房在不同氣候條件下室內熱濕環(huán)境的動態(tài)變化規(guī)律，分析不同季節(jié)下被動式太陽房內不同的被動式通風模式以及不同被動式通風模式在改進室內熱濕環(huán)境方面的作用：揭示了特定被動式通風流動和換熱特性a片黄片黄片大黄片黄片、控制與預測方法欧美黄色性交一级大屏；得到了計算被動式通風對流換熱量的經驗公式以及影響室內熱濕環(huán)境的關鍵因素；了解了含有特朗貝墻體被動式太陽房的自身優(yōu)勢和仍待改進的方面欧美成年人视频在线观看免费；在實體大被動式太陽房實驗技術方面積累了一定的經驗呦呦网址。

At last the paper realized the advantages and disadvantages of passive solar building and adnvanced some suggestions in future research. From another point, the paper logged the process of the building of the experimental equipment and the mounting of the measurement equipments that accumulated some operating experimence.Carrying experiments, calculating and analyzing the experimental data for more than 2 years, the paper gained some constructive conclusions. In winter the indoor air temperature and RH are lower than comfort criteria, but people feels very comfortable in the passive solar house. The thermo-circulation formed by Trombe wall play an important role in improving indoor air temperature and RH. Based on the analogy analysis theory, the natural convection heat transfer in the air gap can be treated as superposition of two natural convection heat transfer processes occurring over isolated isothermal vertical flat plate, in this case namely the massive wall and glazing. Two empirical formulas for Q and Nu are obtained. The investigation shows that the optimal time to open the damper should comply with the period that the thermo-circulation happens which can be controlled by thermal response characteristics of Trombe wall surface temperature and air temperature in the air gap.

經過兩年多的實測和計算，根據(jù)傳熱學激情婷婷另类小说、流體力學91黄色大片、統(tǒng)計學等學科的基礎理論，對大量數(shù)據(jù)進行整理歸類91AⅤ看片、分析討論一级日韩性爱网站，主要得到如下結論：(1)冬季，含有特朗貝墻體的被動式太陽房室內熱濕環(huán)境較舒適性標準偏低日本视频一区在线观看，但人體感覺比較舒適欧美精品/8精品，特朗貝墻體形成的熱循環(huán)通風在調節(jié)室內溫度和相對濕度方面起到很大的作用；(2)特朗貝墻體空氣間層自然對流可以看作是兩個等溫獨立大平板的自然對流換熱過程的疊加女孩小穴自慰网站，通過與大平板自然對流理論類比獲得了計算熱循環(huán)過程中對流換熱量的經驗公式亚洲人成在线精品无码毛片；(3)特朗貝墻體通風口的啟閉可以根據(jù)玻璃幕墻內壁面溫度、蓄熱墻體外壁面溫度和空氣間層進出口空氣溫度之間的關系來進行控制亚洲第一色日韩，從而有效地阻擋冬季冷循環(huán)的發(fā)生国产久精品；(4)夏季，如沒有有效的通風降溫措施人人操人人操人人操人人操人人人操，被動式太陽房內會產生明顯的過熱少妇无码大屁股视频XXXX。

In this paper, research is focused on the heat and mass transfer features during absorption process on the two-scale corrugation plate surfaces of plate-shell heat exchangers. This new Kind structure has vertical large corrugations and horizontal small ones, which can enhance the convection heat transfer of cooling water at internal plate channel side and make the liquid falling film uniformly distributed and turbulent by twisting path, so that the heat and mass transfer characteristics at both sides can be enhanced while sufficient flow area for adequate resistance requirement is also met.

本論文圍繞一種新型交叉雙尺度波紋板片組成的板殼式吸收器進行研究，這種新型傳熱元件的相鄰板片的豎直大波紋相頂靠一级牧交视频播放在线观看，形成曲折的板內通道和菱形板外通道2020国产精品永久在线，可強化板內側冷卻水的對流傳熱国产欧美日韩精品第一区，而其水平小波紋則可對布膜的溴化鋰濃溶液和冷劑蒸汽產生連續(xù)的擾動，使液膜分布均勻日本一道本男人天堂综合网，傳熱傳質得到強化黄片一级在线观看视频免费。

The radiative properties of syngas mixture were calculated by weighted-sum-of-gray-gases model. The Ranz- Marshall correlation for Nusselt number was used to account for convection heat transfer between gas phase and particles. The discrete ordinates model was used for modeling of the radiative heat transfer, and the effect of ash/slag particles on radiative heat transfer was considered.

溫度場計算肘基于灰氣體加權和模型與離散坐標法相結合的方法求解熱輻射方程，同時考慮了煤渣顆粒的熱輻射和散射影響东北肥女人毛多水多性视频，利用Ranz-Marshall關系式計算氣固相間對流換熱作用性爱在线欧美。