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Downward vertical tube 垂直下降管
A downward vertical stroke in handwriting. 倒竖书法中自上而下的一竖
A water pipe that consists of a bottle or a vertical tube partially filled with liquid and a smaller tube ending in a bowl, used often in smoking narcotic substances. 水烟枪一种用部分盛液体的瓶或垂直管和一根接在木球上的小管做成的盛水管，经常用来吸麻醉物品
S.G. Kandlikar, An improved correlation for predicting horizontal and vertical tube, Two-phase Flow and Heat Transfer Conf. Seattle, W.A.(1983). 王维城;刘志坚;王补宣;张立宁.;强化水平管内流动沸腾换热的实验研究
Vertical tube mounting is preferred, but horizontal opration is permissible if pins 2 and 8 are in horizontal plane. 垂直管安装是首选，但对于横向的操作是可以容许的，如果引脚2和8个是在水平面。
Based on Darcy-Brinkman Model, a theoretical study of laminar film condensation on a vertical tube surface with thin porous coatings was carried on. 假设：（1为无限大空间；（2层流膜状凝结；（3凝结为二维轴对称；（4）凝液与蒸汽之间无两现区；（5）忽略对流项和惯性项。
The combustor consisted of a vertical tube opened at both ends with a swirling-stream flame stabiliser located near the middle of its lower half. 在实验中所采用的脉劝燃烧器是基于里克管原理设计的。
The heat transfer enhancement of the mixtures of isopropyl alcohol and water inside vertical tube was experimented in the presence of air. 以异丙醇-水溶液为研究物系,引入空气对垂直管内流动相变强化传热进行了实验研究。
Falling film absorption with TFE/NMP solution in a static vertical tube and that in a vacillating tube are investigated respectively. 分别对静止和摇摆状态下TFE/NMP垂直管内降膜吸收进行实验研究。
A water pipe that consists of a bottle or a vertical tube partially filled with liquid and a smaller tube ending in a bowl,used often in smoking narcotic substances. 水烟枪，一种用部分盛液体的瓶或垂直管和一根接在木球上的小管做成的盛水管，经常用来吸麻醉物品。
The experimental results on the effect of inclined angle of tube end on flooding velocity of immiscible mixtures condensed in a vertical tube are reported. 实验研究了管端斜口对竖直管内不互溶蒸汽冷凝液泛气速的影响,并给出了经验关系式。
The result of experiment indicate that the helically tube has great capabilities in restraining the heat transfer deterioration in comparision with the vertical tube. 研究结果表明，螺旋管内两相沸腾传热恶化临界干度较垂直管内的高。
She laid the picture face downward on the table. 她把那幅画正面朝下放在桌上。
Based on the theoretical analysis, the electrohydrodynamics (EHD) enhancement of condensation heat transfer inside vertical tube for five representative electrodes were investigated. 基于EHD强化管内凝结换热的理论分析，对5根直径不同的电极进行了垂直管内EHD强化凝结换热实验研究。
A downward tendency, as in the price of a stock. 下降趋势如股票价格等的下降趋势
Prices started a downward plunge. 价格开始猛跌。
Based on Experimental investigations, the DNB characteristics of steam-water mixtures in one-side heated vertical tubes under subcritical pressure are discussed. 在试验研究的基础上,讨论了亚临界压力单面受热垂直管内汽水混合物传热恶化的特点。
The model takes into account separately the churn, slug and bubbly flow patterns in this type of absorption processes of inside vertical tubes. 利用模型对吸收过程中出现的搅拌流、活塞流、泡状流等分别进行分析，获得了泡式吸收方式吸收过程中的一些传热传质特性。
Taitel Y,Barnea and Duker A E:Modeling flow pattern transitions for steady upward gas-liquid flow in vertical tubes,AICHE J, 1980(26). 陈杰于达严大凡:油-水两相流流型转换研究;水动力学研究与进展;2003;18(3).
He looked downward to avoid my eyes. 他低著头看,以避开我的目光。