Hydrodynamics of swirling flow in a circular tube with sudden increase in cross-section and of the flow through a borda mouthpiece

1994 ◽  
Vol 29 (3) ◽  
pp. 341-353
Author(s):  
G. N. Abramovich ◽  
G. Yu. Stepanov
Keyword(s):  
Cross Section ◽  
Swirling Flow ◽  
Circular Tube ◽  
Sudden Increase ◽  
Flow Through

Hot-Wire Measurements of Turbulence Correlations in a Triangular Duct

1962 ◽  
Vol 29 (4) ◽  
pp. 609-614 ◽  
Author(s):  
C. J. Cremers ◽  
E. R. G. Eckert
Keyword(s):  
Heat Transfer ◽  
Laminar Flow ◽  
Cross Section ◽  
Circular Tube ◽  
Turbulent Transport ◽  
Circular Cross Section ◽  
Hot Wire ◽  
Round Tube ◽  
Flow Through ◽  
Hot Wires

Previous studies by flow visualization have indicated that the flow through a duct of triangular cross section is in its characteristics quite different from flow through a duct with circular cross section. They revealed among others that purely laminar flow exists in the corners of the duct even though the bulk of the fluid moves in turbulent motion. Heat-transfer measurements in such a duct appear to indicate that the turbulent transport in the direction of the height of the duct is considerably smaller than expected from circular tube measurements. The present paper reports the measurements of turbulent correlations for turbulent flow through such a duct. These measurements have been made with hot wires of very small dimensions. They again reveal the existence of a laminar corner region. In the bulk of the fluid, the differences of the correlations to those in a round tube turned out to be smaller than originally suspected.

scholarly journals Thermohydraulic performance comparision of compound inserts for a turbulent flow through a circular tube

2017 ◽  
Vol 21 (3) ◽  
pp. 1309-1319
Author(s):  
Arvind Kapse ◽  
Prashant Dongarwar ◽  
Rupesh Gawande
Keyword(s):  
Cross Section ◽  
Circular Tube ◽  
Optimum Combination ◽  
Working Fluid ◽  
Pumping Power ◽  
Number Range ◽  
Tube Heat Exchanger ◽  
Friction Factors ◽  
Plain Tube ◽  
Flow Through

Heat transfer and pressure drop characteristics of three different passive inserts are experimentally investigated for individual and compound insertion. Insert cross-section is altered along the length of test section for compound insertion. Test runs were conducted in a concentric circular tube in tube heat exchanger in the Reynolds number range of 8000 to 32000 with water as a working fluid. Enhancements in Nusselt number and friction factors are reported to be in the range of 38-234% and 55-524%, respectively, over plain tube. The average performance ratios based on equal pumping power are also reported and found in the range of 0.63-1.53. Based on experimental results, optimum combination for compound insertion is proposed.

Creeping Viscous Flow Through a Circular Tube of Nonuniform Cross Section

1972 ◽  
Vol 39 (3) ◽  
pp. 657-660 ◽  
Author(s):  
W. E. Langlois
Keyword(s):  
Velocity Profile ◽  
Viscous Flow ◽  
Cross Section ◽  
Circular Tube ◽  
Pressure Gradients ◽  
Local Velocity ◽  
Slowly Varying Function ◽  
Flow Through ◽  
Pipe Radius

Creeping viscous flow in a nonuniform pipe is analyzed by taking the local velocity profile and pressure gradients to be those of flow in a cone-shaped region. With this approach it is not necessary to assume that the pipe radius is a slowly varying function of distance along the axis.

scholarly journals Swirling Flow through a Curved Diffuser (Flow Properties and Vibration in Pipeline)

2006 ◽  
Vol 72 (722) ◽  
pp. 2449-2456
Author(s):  
Hideki HIBARA ◽  
Yoko YAMANISHI ◽  
Kozo SUDO
Keyword(s):  
Swirling Flow ◽  
Flow Properties ◽  
Diffuser Flow ◽  
Flow Through

Gaseous dispersion in laminar flow through a circular tube

1965 ◽  
Vol 284 (1399) ◽  
pp. 540-550 ◽  
Keyword(s):  
Circular Tube ◽  
Dispersion Coefficient ◽  
Straight Tube ◽  
Laminar Regime ◽  
Thermal Conductivity Detector ◽  
Longitudinal Dispersion Coefficient ◽  
Dispersion Coefficients ◽  
Effective Dispersion ◽  
Flow Through ◽  
Gaseous Dispersion

The dispersion of a pulse of ethylene injected into nitrogen, flowing in the laminar régime through straight and curved tubes, has been investigated at pressures of 1.0 and 4.4 atm. From the study of the concentration profiles with a thermal conductivity detector (katharometer) it is found that the experimental results for gas velocities between 1.00 and 16.00 cm/s agree well with the analytical solution to this problem for a straight tube given by Sir Geoffrey Taylor and extended by Aris. In particular, at low velocities, the effective dispersion coefficients tend to the molecular diffusivities. The presence of a bend slightly reduces the effective longitudinal dispersion coefficient and the introduction of constrictions enhances it. Data are also given on a number of other gas pairs. It is concluded that measurements of dispersion provide an accurate and simple way of studying diffusion in gas mixtures.

Modeling of the Ionized Fluid Flow through a Cone-Shaped Nanopore

2007 ◽  
Vol 121-123 ◽  
pp. 1089-1092 ◽  
Author(s):  
Jian Zhong Fu ◽  
Xiao Bing Mi ◽  
Yong He ◽  
Zi Chen Chen
Keyword(s):  
Fluid Flow ◽  
Theoretical Analysis ◽  
Cross Section ◽  
Debye Length ◽  
Velocity Profiles ◽  
Gradual Change ◽  
Ion Flow ◽  
Flow Through

Theoretical analysis of the ionized fluid flowing through a cone-shaped nanopore is presented. The internal cross section of the cone-shaped channel is in the range from micro- to nanometer and gradual change from larger to smaller than the Debye length for the ions. The model is developed to predict the ionized fluid flow behaviors in cone-shaped micro/nanochannels. The velocity profiles of ion flow that occur in nanopores are obtained.

Measurements in turbulent swirling flow through an abrupt axisymmetric expansion

AIAA Journal ◽  
1988 ◽  
Vol 26 (6) ◽  
pp. 669-681 ◽  
Author(s):  
P. A. Dellenback ◽  
D. E. Metzger ◽  
G. P. Neitzel
Keyword(s):  
Swirling Flow ◽  
Flow Through
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