Of the currently available coolers for electronic products with a high heat flux, micro - jets impingement cooling heat sinks are able to provide the best heat transfer performance : lowering the maxmal temperature and the temperature difference. the heat transfer for multiple jets impingement has been studied firstly for summarizing a few rules. and then a copper micro - jets impingement cooling heat sink consisting of five copper sheets is designed in this paper and the jet diameter is 0. 15mm
本文首先對陣列射流沖擊進行了實驗研究,總結了陣列射流沖擊的一些規律和特性,在此基礎上,根據數值模擬優化結果設計和製作了微射流陣列冷卻
熱沉(射流孔直徑d = 0 . 15mm ) ,並採用去離子水和氮氣作為工質,對
熱沉內流體壓降和傳
熱特性進行了研究。
Polycrystalline diamond films with preferred orientation by adopting assisted - bias hfcvd technique are prepared, and the mechanisms of the nucleation and growth of the films are studied. in addition, application of the film to the heat sink of power electron device is discussed
採用輔助偏壓
熱絲cvd技術,制備擇優生長的多晶金剛石薄膜,研究了金剛石薄膜的成核及生長機理,並將其應用於功率電子器件的
熱沉。
Of the currently available coolers for electronic products with a high heat flux, microchannel heat sinks have been proved to be able to provide the best heat transfer performance and are one of the most promising coolers. the manifold microchannel ( mmc ) heat sink has many advantages such as low thermal resistance, compact structure, little amount of coolant, low flow rate, uniform temperature distribution along the flow direction and many others, so it is able to provide the best heat transfer performance : lowering the maxmal temperature and the temperature difference
在目前高
熱通量電子產品冷卻器中,微通道
熱沉已被證實是傳
熱性能最佳且最具應用潛力的冷卻方式之一,而歧管式微通道
熱沉因具有低
熱阻、結構緊湊、所需冷卻液量小、沿流動方向溫度分佈均勻等優點則成為減小電子元器件換
熱表面最高溫度、降低溫度變化的一種有效方法。
Results obtained in the research are : l. by the virtue of palaeostructure analysis and method of balanced cross sections, we have studied the formation and development history of qianmiqiao buried hills, and indicate that the formation of ordovician buried hills can be mainly divided into four periods, namely, stable uplift period, fold - thrust period, block - fault tilting period, and thermal subsidence and depression period
論文取得以下成果: 1採用古構造分析和平衡剖面技術,研究了千米橋潛山的形成演化史,指出其下古生界奧陶系潛山的形成主要經歷了穩定抬升、褶皺沖斷、塊斷翹傾和
熱沉降坳陷四個時期。
The experimental results of the flow characteristics of the mmc heat sink indicate that the critical reynolds number signifying the transition from laminar flow to turbulent flow is in advance ; under the same experimental conditions, the variation in entrance direction of the microchannel inlet and outlet has little effect on the microchannel ; the experimental values of the friction factor of the de - ionized water in a microchannel agree well with those calculated using the theoretical laminar formula ; furthermore, a comparison of the experimental results and simulation results shows that navier - stokes equation and rng - turbulence model can be used to model the laminar and turbulence flow regions in a microchannel ; meanwhile, the correlations of the flow resistance in the turbulent flow regions for the de - ionized water as the working fluids are obtained from experiments
對歧管式單通道
熱沉流動特性的研究結果表明,微通道內流體流態由層流向紊流轉變的臨界雷諾數提前;改變流體的進出口方向對
熱沉總壓降造成的影響很小;摩擦系數的實驗值與理論值較接近;數值模擬結果能夠與實驗值較好吻合;並由實驗給出了紊流區流動阻力的實驗關聯式。此外,選用十二烷基硫酸鈉( sodiumdodecylsulphate , sds )以及烷基多糖苷( alkylpolyglycoside , apg )作為減阻添加劑,研究了表面活性劑添加對微通道流動特性的影響。
The structure evolution o f cenozoic experienced rifting subsidence of paleogene and rifting thermal subsidence of neogere and quartenary
新生代構造演化經歷了老第三紀裂陷
沉降和新第三紀至第四紀後期裂陷
熱沉降階段。
Diamond is a remarkable material due to its special crystal structure, which shows high hardness, low friction coefficient, high thermal conductivity, high optical transparency, low permittivity and high band gap etc. cvd diamond films are widely used in mechanical coating, heat sinks, optical window, semiconductor devices and other application fields because of its low price and high performance
金剛石的特殊晶體結構使其成為一種性能優異的功能材料,它具有高硬度、低摩擦系數、高
熱導率、高透光率、低介電系數和高禁帶寬度等性質。化學氣相
沉積制備金剛石膜成本低、質量高,廣泛應用於工具塗層、
熱沉、光學窗口、半導體器件等方面。
Study of the heat transfer characteristics of phase - of - change thermal storage radiation heat sink
輻射器式
熱沉的傳
熱特性研究
Bozhong area has different oil - gas accumulation characteristics from the adjace nt onshore oil fields. because of the latter thermal event and tectonic action, bo zhong area became the subsidence center and depo - center of the bohai bay basin
其具有不同於周邊陸地油田的油氣成藏特點,晚期的
熱沉降和構造活動使其成為渤海灣盆地的
沉降和
沉積中心,上第三系具有優于周邊陸地油田的良好的儲蓋條件,晚期的構造活動與油氣主要排烴期相匹配,為油氣向上第三系圈閉中運聚提供了良好條件。
Optimization design of structural size of microchannel cooling heat sink
微槽冷卻
熱沉結構尺寸的優化設計
The paper analyzed and discussed two - dimensional heat sink in theory
本文對二維的
熱沉問題進行了理論分析和討論。
The diamond film is grown on the horizontal power diodes as their heat sink
將金剛石薄膜應用於功率二極體(橫向)的
熱沉。
Good news travels fast. my warmest congratulations and wishes for many years of happiness together
好事傳千里。熱沉地祝你們幸福到永遠。