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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。
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。
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。
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。
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 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。
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。
SUN Zhongning,SUN Licheng,YAN Changqi,et al.Experimental investigation of single-phase flow friction in narrow annuli[J].Nuclear Power Engineering,2004,25 (2):123-127 (in Chinese). [2]孙中宁;孙立成;阎昌琪;等.;窄缝环形流道单相摩擦阻力特性实验研究[J]
Experimental Investigation of Single-phase Flow Friction in Narrow Annuli 窄缝环形流道单相摩擦阻力特性实验研究
The road is too narrow to allow the passage of gondola. 这条街太窄，大型货车不能通过。
The mountain path is narrow and rugged. 狭隘的山路崎岖不平。
The travelers edged warily along the narrow road. 旅游者沿着狭窄的小路小心前行。
A chill struck into the narrow of his bones. 他感到一股寒意，透入骨髓。
The tide flushed through this narrow inlet. 潮水涌过了狭窄的小湾。
A gem cut in the form of a narrow rectangle. 狭长形宝石被切成细条形的宝石
She turned the car into the narrow street. 她驱车拐进狭窄的街道。