Incipient-boiling Superheats for Sodium in Turbulent Channel Flow: Effect of Rate of Temperature Rise

1973 ◽  
Vol 95 (2) ◽  
pp. 159-165 ◽  
Author(s):  
O. E. Dwyer ◽  
G. Strickland ◽  
S. Kalish ◽  
P. J. Hlavac ◽  
G. A. Schoener
Keyword(s):  
Experimental Study ◽  
Turbulent Flow ◽  
Experimental Method ◽  
Channel Flow ◽  
Temperature Rise ◽  
Turbulent Channel Flow ◽  
Control Temperature ◽  
Flow Effect ◽  
Temperature Ramp ◽  
And Control

Using sodium, an experimental study was carried out to determine the effect of rate of temperature rise on the incipient-boiling superheat for fully developed, forced turbulent flow. Three different methods of achieving boiling inception were used. The magnitude of the incipient-boiling superheat was found to be quite reproducible and independent of the experimental method as long as the rate of temperature rise (temperature ramp) was kept constant and kept the same. Moreover, the value of the superheat was found to have a strong dependency on the temperature ramp—the greater the ramp, the larger the superheat. The failure to carefully measure and control temperature ramp is apparently one reason why incipient-boiling-superheat data generally show so much scatter, and those from different laboratories so much disagreement.

Deposition of Small Particles From Turbulent Flows

2003 ◽  
Author(s):  
Z. Wu ◽  
J. B. Young
Keyword(s):  
Turbulent Flow ◽  
Turbulent Flows ◽  
Channel Flow ◽  
Gas Turbines ◽  
Particle Deposition ◽  
Numerical Study ◽  
Turbulent Channel Flow ◽  
Brownian Diffusion ◽  
Small Particles ◽  
Two Fluid

This paper deals with particle deposition onto solid walls from turbulent flows. The aim of the study is to model particle deposition in industrial flows, such as the one in gas turbines. The numerical study has been carried out with a two fluid approach. The possible contribution to the deposition from Brownian diffusion, turbulent diffusion and shear-induced lift force are considered in the study. Three types of turbulent two-phase flows have been studied: turbulent channel flow, turbulent flow in a bent duct and turbulent flow in a turbine blade cascade. In the turbulent channel flow case, the numerical results from a two-dimensional code show good agreement with numerical and experimental results from other resources. Deposition problem in a bent duct flow is introduced to study the effect of curvature. Finally, the deposition of small particles on a cascade of turbine blades is simulated. The results show that the current two fluid models are capable of predicting particle deposition rates in complex industrial flows.

New designs for vertical slot fishways

1992 ◽  
Vol 19 (3) ◽  
pp. 402-414 ◽  
Author(s):  
N. Rajaratnam ◽  
C. Katopodis ◽  
S. Solanki
Keyword(s):  
Experimental Study ◽  
Turbulent Flow ◽  
Key Words ◽  
Channel Flow ◽  
Open Channel ◽  
Open Channel Flow ◽  
Slot Width ◽  
Satisfactory Performance ◽  
Vertical Slot ◽  
Hydraulic Design

This paper presents the results of an experimental study on 18 designs of vertical slot fishways. Based on these results, it appears that a width of 8b0 and a length of 10b0 for the pools, where b0 is the slot width, are satisfactory, and minor variations can be made to these dimensions without affecting their satisfactory performance. In the two general groups of designs, design 6 in the first group and designs 16 and 18 in the second group are recommended for practical use. Key words: fishways, hydraulics, turbulent flow, open-channel flow, hydraulic design.

Hydraulics of offset baffle culvert fishways

1988 ◽  
Vol 15 (6) ◽  
pp. 1043-1051 ◽  
Author(s):  
N. Rajaratnam ◽  
C. Katopodis ◽  
S. Lodewyk
Keyword(s):  
Experimental Study ◽  
Velocity Field ◽  
Turbulent Flow ◽  
Key Words ◽  
Channel Flow ◽  
Open Channel ◽  
Open Channel Flow ◽  
Flow Equation

This paper presents the results of an experimental study on the hydraulics of culverts with offset baffles to pass fish. Using analytical considerations and experimental observations, a flow equation has been developed between the discharge, diameter, depth, and slope for a culvert fish way with the standard offset baffle system. The velocity field at the slot has also been evaluated. Some further experiments were performed to assess the effect of baffle spacing and height on the hydraulics of the culvert fishway. Key words: culverts, fishways, baffles, hydraulics, open-channel flow, turbulent flow.

Experimental Study of Polymer Drag Reduction in a Turbulent Channel Flow

2003 ◽  
Author(s):  
Xiaochun Shen ◽  
Kihyun Kim ◽  
Jamison L. Miller ◽  
Ryan Sun-Chee-Fore ◽  
Ana I. Sirviente
Keyword(s):  
Experimental Study ◽  
Polymer Solution ◽  
Channel Flow ◽  
Water Channel ◽  
Turbulent Channel Flow ◽  
Turbulence Characteristics ◽  
Polymer Injection ◽  
Turbulent Channel Flows ◽  
Polymer Drag Reduction ◽  
Turbulent Water

The effect of polymer injection on the turbulence characteristics of a fully developed turbulent water channel flow was studied. The main focus of this study was to assess the influence of the polymer solution injection concentration and consequent mixing. This study was conducted by measuring the turbulence characteristics of two fully developed turbulent channel flows for a Reynolds number of 5×104, with different injection concentrations of the same polymer solution but with the same homogeneous concentration at the test section. These measurements were complemented by visualizations of the flow, which revealed the presence of supra-molecular polymer structures. The development of such structures seems to enhance the drag reducing abilities of the polymer solution.

scholarly journals LES of Particle-laden Turbulent Channel Flow : Effect of Inter-Particle Collision

1999 ◽  
Vol 65 (629) ◽  
pp. 166-173 ◽  
Author(s):  
Yasufumi YAMAMOTO ◽  
Matthias POTTHOFF ◽  
Toshitsugu TANAKA ◽  
Takeo KAJISHIMA ◽  
Yutaka TSUJI
Keyword(s):  
Channel Flow ◽  
Turbulent Channel Flow ◽  
Particle Collision ◽  
Flow Effect
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