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flowed friction
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  相似匹配句对
     On Friction
     谈谈摩擦力
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     5.friction;
     5 减阻 ;
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     Equation of Flowed Energy and its Appliction
     气流能量方程及其应用
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In a previous paper[1], a theoretical analysis has been presented to the heat-transfer coefficient for laminar boundary layer flow in the entrance region of a circular tube. This is a succeeding one based on Karman's method of approach, to attack the entrance effect on flow-friction behavior of an isothermal boundary layer flow of incompressible fluid. The family of climensionless velocity profiles is well defined by eq. (3) and (4). The predicted friction coefficients from eq....

In a previous paper[1], a theoretical analysis has been presented to the heat-transfer coefficient for laminar boundary layer flow in the entrance region of a circular tube. This is a succeeding one based on Karman's method of approach, to attack the entrance effect on flow-friction behavior of an isothermal boundary layer flow of incompressible fluid. The family of climensionless velocity profiles is well defined by eq. (3) and (4). The predicted friction coefficients from eq. (17) or (19), eq. (23), (25) and (26), eq. (28) and (30) respectively are in good agreement with the complicated Langhaar's solution[6] and data reported in the literature[3,5,7,16].

本文是文[1]的继续。文中,在直圆管具有平滑进口及流体是不可压縮的假定下,对圆管进口段层流边界层发展区的流动阻力与壁面摩擦阻力作了环状边界层的理论分析,提供了常物性情况下的简捷近似計算解;并对新的实验资料及其經驗綜合式作了分析和討論,証明这些数据与以前文献中所报导的結果实质上相互符合,而文献[4]所推荐的綜合式还没有最真实地反映出原始数据的规律性。

This paper presents an empirical correlation of the two-phase flow frictionmultiplier,an experimental correlation of the single flow friction coefficient,and an experimental curve of the form resistant coefficients of spacer grids forwater upflowing vertically in 9 rod-bundles arrayed in square lattice.The steadystate test parameters for the single flow and two-phase flow were determined asfollows:pressure p=140kg(f)/cm~2。mass velocity wg=(1.5-8)×10~6 kg/m~2·h,Reynolds unmber Re=3×10~3-1.5×10~5,heat...

This paper presents an empirical correlation of the two-phase flow frictionmultiplier,an experimental correlation of the single flow friction coefficient,and an experimental curve of the form resistant coefficients of spacer grids forwater upflowing vertically in 9 rod-bundles arrayed in square lattice.The steadystate test parameters for the single flow and two-phase flow were determined asfollows:pressure p=140kg(f)/cm~2。mass velocity wg=(1.5-8)×10~6 kg/m~2·h,Reynolds unmber Re=3×10~3-1.5×10~5,heat flux q=(0.2-1.3)×10~6 kcal/m~2·h,average true quality x=0.0002—0.23Both subcooled boiling flow and saturated boiling flow were regarded as two-phase flow and their experimental data were correlated into a united empiricalcorrelation with the true quality.In order to measure signals reliablly and accuratly,a new device of pressuretaps has been used in this test.

本文介绍高压高温水通过9根正方形排列的棒束及棒束定位架时的流动阻力特性实验研究.水强迫垂直向上流过棒束.分别进行了棒束不加热的单相流动实验和棒束均匀加热并出现汽液两相流动时的两相流动实验.单相及两相实验的参数范围:P=140公斤(力)/厘米~2,质量流速 ω~g=(1.5—8)×10~6公斤/米~2小时,雷诺数 Re=3×10~3—1.5×10~5,热流密度q=(0.2—1.3)×10~6千卡/米~2·小时,平均真实含汽量(?)=0.0002—0.23.在实验研究方法上,把欠热沸腾和饱和沸腾这两种工况都看成是两相流动工况,两种工况的实验数据用真实含汽量综合成统一的实验曲线和实验关系式.在测量技术方面,采用新设计的引压装置把压差信号从高压高温实验通道测孔处引入压差计.测取的信号可靠,测量误差小.实验数据全部用计算机处理.经过综合、分析、整理后,得到棒束摩阻实验曲线和实验关系式及定位架的形阻实验曲线.

A numerical method and the corresponding computer program for solving theoretical equations of supersonic wet steam expansion flow with consideration of flow friction and vitial correction for the equation of state is presented in this paper. Such a method is evidently more satisfactory than those ordinarily employed for the calculation of wet steam flow where the vapor is taken as an ideal gas and the expansion is supposed to be friction free. When it is used to calculate the wet steam...

A numerical method and the corresponding computer program for solving theoretical equations of supersonic wet steam expansion flow with consideration of flow friction and vitial correction for the equation of state is presented in this paper. Such a method is evidently more satisfactory than those ordinarily employed for the calculation of wet steam flow where the vapor is taken as an ideal gas and the expansion is supposed to be friction free. When it is used to calculate the wet steam flow in a low pressure Laval nozzle, the results obtained for the position of the Wilson point and wetness fraction agree quite well with existing experimental data.

本文介绍了考虑汽流与喷管壁面之间的摩擦和用virial型状态方程描述水蒸汽热力性质的超音速膨胀湿蒸汽双相流动的求解方法及相应的计算程序,较之通常所用的将水蒸汽作为理想气体并且假设膨胀过程无摩擦的计算程序更加完善.用此程序对低压范围的Laval喷管流动进行了计算,所得结果与已有结果符合较好.

 
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