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- Annuli chartacters 年轮特征
- The geometric models of eccentric annuli flow field were established in the computational fluid dynamics PHOENICS-VR. 摘要在流体计算软件PHOENICS的VR编辑环境中，建立了偏心环空流场几何模型。
- More accurate calculation of pressure loss in narrow annuli of slim holes and coiled tubing operations is required. 在小眼井和连续油管作业的窄环空中，要求更加准确地计算摩擦压降。
- The velocity profile should be confirmed when non-Newtonian fluid flowing in duct and annuli is researched. 摘要在研究非牛顿流体圆管和环空管流层流流动问题时，确定其速度分布是关键。
- In the last two area, heat transfer in narrow annuli is better than that in normal circular tubes. 在层流充分发展区和紊流区，窄环隙的对流换热特性要好于普通圆管。
- The flowing state in narrow annuli changes apparently quicker than that in circular tube. 窄环隙流道内流态由层流向紊流转变明显提前。
- In addition, the decrease of the annuli gap will yield heat transfer deterioration during flowing in narrow annular channels. 此外，环缝间隙的减小将导致环形通道的换热性能下降。
- The key factors affecting frictional pressure loss in narrow annuli are changing annular dimensions, rotation and vibration of drill strings. 影响窄环空中摩擦压降的关键因素为环空尺寸的变化、钻柱的旋转和振动。
- Atmospheric corrosion is generally associated with surface storage conditions, or with upper wellbore annuli that may not be fluid-filled. 大气腐蚀通常与地面储存条件或没有被流体充满的上部井筒环空有关。
- Cui Haiqing,Liu Xisheng.Velocity distribution of helical flow of non Newtonian fluid in eccentric annuli[J].Acta Petrolei Sinica,1996,17(2):76-83. [6]崔海清;刘希圣.;非牛顿流体偏心环形空间螺旋流的速度分布[J]
- When the mass flow rate is larger, CHF in the narrow annuli changed slightly with the pressure.And it will decrease with mass flow rate. CHF随质量流速的增加而减小，存在一个“拐点”，当质量流速大于“拐点”值时，质量流速对CHF的影响就不明显了；
- Experimental study was performed using water as working medium to investigate the flow instability in a vertical narrow annuli with both subcooled and saturated boilings. 以水为工质,分别在过冷和饱和条件下对竖直窄环隙流道进行了自然对流沸腾流动不稳定性实验,观测到了窄隙流道饱和沸腾时所特有的蒸干型流动不稳定性。
- Edge type analysis and marginal increment ratio analysis revealed that the annuli on otoliths and vertebras form annually.Annuli formation occurred from May to June. 在前述年龄鉴定的基础上，进一步对暗纹东方鲀的生长方程、生长拐点及各项生长指标等生长特征进行了研究。
- However, the influence system parameters on the transfer in narrow annuli and the mechanism of the heat transfer have not yet been understood very much. 然而，至今人们对窄缝传热的机理及影响因素仍未获得清晰统一的认识。
- Based on experimental measurements, the mechanism of heat-transfer characteristics as well as the mechanism of flowing friction in narrow annuli is primarily analyzed. 在实验的基础上，本文对窄环隙内的强迫对流换热特性和流动阻力特性进行了初步的分析。
- The motions of LV walls and mitral annuli in 19 patients with myocardial infarction were observed by DTI spectra and tissue velocity imaging (TVI) curves. The velocity waves of DTI spectra and TVI curves were recognized in combination with ECG. 观察19例心肌梗死患者 ,记录左室壁及二尖瓣环DTI频谱和组织速度图 (TVI) ,结合心电图辨认各速度波。
- The results show that the parameter w, the ratio of the inner wall heat flux to the outer wall heat flux, has great influences on the heat transfer characteristics in bilaterally heated narrow annuli. 计算结果表明，环形通道内、外壁加热热流密度比的不同，对环形通道内、外壁与单相水的对流换热特性有着显著的影响。
- Experiments were carried out to investigate the single-phase forced convection heat transfer with water in three vertical narrow annuli which were heated from inside by primary water. 本文在常压下,以水为工质,对三种尺寸的竖直窄环隙流道进行了单相强迫对流换热实验研究。
- By using volume control method, the basic equations of axial laminar flow for power law fluids in eccentric annuli was seperated and sovled by ADI (Alternate Direction Iterail) method. 利用控制体积法对幂律流体偏心环空轴向层流流动的基本方程进行了离散化处理，并用ADI方法进行了求解。
- It was found that the major flow patterns in the narrow annuli were intermittent and annular.The effects of mass flux, heat flux and quality on boiling heat transfer coefficient are examined. 通过对环形窄缝通道的两相流动的研究，得出环形窄缝通道内两相流动的流型主要为间歇流和环状流。
