The rate of heat flow between any two points increases with difference of temperature . 任何兩點(diǎn)間的熱流動速率則隨溫差的加大而增加。
Difference of temperature in cross section of kiln 窯內(nèi)斷面溫差
It has distinctive difference of temperature between blue moon valley and sun valley ,谷中有籃月亮峽谷和太陽谷,在兩峽谷交界
Since china covers a vast area , there is a great difference of temperature between the north and the south 列車員:由于中國土地遼闊,南方和北方的溫度相差很大。
Free adjustment design of toe cap pressing travel is never affected by the differences of temperature and pressure . it provides very stable force for pressing 鞋頭壓著行程免調(diào)設(shè)計(jì),絲毫不受溫壓差之影響,確實(shí)提供極穩(wěn)定之壓著力。
The difference of temperature fields from considering and neglecting the temperature - dependence of material parameters is compared , and the temperature distributions of al pipe are obtained in angular orientation at various time 給出了溫度隨角向的分布曲線,比較了物理參數(shù)隨溫度變化和不隨溫度變化兩種情況下溫度場的區(qū)別,并進(jìn)一步得到了近場區(qū)域表面波的時域波形。
The paper combines the dashenkeng n bridge design with the method of finite elment analysis , makes computation model of bridge structure , makes use of dr . v2 . 9 refering to british bs5400 and specification of new zealand and china , analyses temperature effect of dashenkeng ii , gets the caculate result to guide construction on site : differences of temperature models reach different results 本文結(jié)合大深坑號橋的實(shí)際情況,從結(jié)構(gòu)溫度效應(yīng)分析的有限元法出發(fā),建立了橋梁結(jié)構(gòu)計(jì)算的模型,采用同濟(jì)大學(xué)橋梁工程系開發(fā)的《 dr bridge橋梁博士2 . 9版》平面桿系有限元分析程序參照英國bs5400規(guī)范、新西蘭規(guī)范及我國公路橋梁設(shè)計(jì)規(guī)范分別分析了大深坑橋縱向的溫度效應(yīng),并將結(jié)果予以對比。
The interactions between heat flux density , vapor pressure , vapor velocity and the coefficient of heat transfer for condensation in tube , the coefficient of heat transfer in total are investigated . the relationships between heat flux density and the total difference in temperature , the difference of temperature , pressure drop of vapor from the entrance of the tube to the exit are investigated as well 考察了冷卻水流量、溫度恒定條件下熱流密度、蒸汽壓力、蒸汽流速對冷凝傳熱膜系數(shù)及總傳熱系數(shù)的影響關(guān)系,同時考察了總傳熱溫差、蒸汽進(jìn)出口溫差及壓差隨熱流密度變化的關(guān)系。
The suitable oil flux during the circulating of transformer could be defined according to the difference of temperature between the oil and wind in the inlet and the cooling capacity of the wind cooling system ; besides the oil flux can be determined by ultrasonic , it can be estimated whether the oil is flowing equably by determining the oil flux in the branch pipes ; reducing the oil flux of the oil pump could be realized by controlling to change its frequency , which could not only save the energy , reduce the wastage , but benefit the transformer ' s circulating safely 變壓器運(yùn)行中可根據(jù)進(jìn)口油溫和進(jìn)口風(fēng)溫之差、風(fēng)冷卻器的冷卻容量來確定合適的油流量;油流量可以通過超聲波法進(jìn)行測量,測量油的分管流量還可判斷油流的均勻情況;降低潛油泵流量可通過潛油泵的變頻控制來實(shí)現(xiàn),不僅節(jié)能降耗,對變壓器的安全運(yùn)行也有著重要意義。
It shows that the injection quantity and the difference of temperature distribute as a parabola which is at the same load , and the minimum of the parabola corresponds to the optimum quantity of injection ( g ) . under the condition that the quantity of injected mass , the air speed and the heat quantity is respectively g , v and q , the research demonstrates that the pentium iv chip ' s temperature variation can be controlled under 40c and work normally when the wind speed overpass 1 . 5m / s and the power dissipation of the chip is 60w . otherwise this paper calculates the flooding limit of thermosiphon with several different methods 對其充灌量、散熱量、電子元件( cpu模擬芯片)表面與環(huán)境溫度之差及通風(fēng)、流速的影響進(jìn)行了系統(tǒng)的測試,發(fā)現(xiàn)充液量與溫差的關(guān)系在負(fù)荷不變時呈拋物線分布,其極小值點(diǎn)對應(yīng)的充液量是最佳充液量g 。在充液量為g時,對風(fēng)速v 、散熱量q進(jìn)行的研究表明,當(dāng)風(fēng)速超過1 . 5m / s后,奔騰芯片在60w發(fā)熱條件下芯片溫度小于40 ,能滿足長期正常工作。