Discussion: “A Suction Scheme Applied to Flow Through Sudden Enlargement” (Heskestad, G., 1968, ASME J. Basic Eng., 90, pp. 541–552)

1968 ◽  
Vol 90 (4) ◽  
pp. 553-553
Author(s):  
N. J. Lipstein
Keyword(s):  
Sudden Enlargement ◽  
Flow Through

605 A Study of Rising Bubbly Flow through Sudden Enlargement

2000 ◽  
Vol 2000.37 (0) ◽  
pp. 217-218
Author(s):  
Kenichi SHIMOCHA ◽  
Shigeo KIMURA ◽  
Atsushi OKAJIMA ◽  
Takahiro KIWATA
Keyword(s):  
Bubbly Flow ◽  
Sudden Enlargement ◽  
Flow Through

Flow through pipes with sudden enlargement

1991 ◽  
Vol 18 (4) ◽  
pp. 199-206 ◽  
Author(s):  
R. Srikanth ◽  
E. Rathakrishnan
Keyword(s):  
Sudden Enlargement ◽  
Flow Through

Further Experiments With Suction at a Sudden Enlargement in a Pipe

1970 ◽  
Vol 92 (3) ◽  
pp. 437-447 ◽  
Author(s):  
Gunnar Heskestad
Keyword(s):  
Boundary Layer ◽  
Pipe Flow ◽  
Expansion Ratio ◽  
Turbulent Pipe Flow ◽  
Thin Boundary Layer ◽  
Inlet Flow ◽  
Upper Limit ◽  
Sudden Enlargement ◽  
Flow Through ◽  
And Performance

Previously reported experiments on incompressible flow through a step expansion in a pipe, as influenced by suction at the smaller diameter of the step, have been extended to examine effects of inlet flow on suction requirements and performance of the device as a (short) diffuser. Here the performance for a fully developed turbulent pipe flow is considered and compared to previous results for an inlet flow with thin boundary layer. Whenever overall diffuser length is restricted to values less than some upper limit for a given expansion ratio, then for either inlet flow condition, the present device is shown to produce higher pressure recoveries (adjusted for suction power) than conical diffusers.

Integral formulation of balance equations for two-phase flow through a sudden enlargement Part 1: Basic approach

1997 ◽  
Vol 211 (5) ◽  
pp. 387-397 ◽  
Author(s):  
A Attou ◽  
L Bolle
Keyword(s):  
Void Fraction ◽  
Fluid Flows ◽  
Momentum Balance ◽  
Phase Flow ◽  
Balance Equations ◽  
Two Phase ◽  
Sudden Enlargement ◽  
Flow Through ◽  
Quality Value ◽  
Dissipation Losses

A general expression of irreversible losses related to two-phase flows through a sudden enlargement is derived from basic balance equations (mass, momentum and energy). The need to take into account void fraction and quality changes is emphasized for some one-fluid flows. From a comparison with several experimental results, it is concluded that a void fraction decrease downstream of the enlargement must be considered in order to predict satisfactorily pressure variations on the basis of the momentum balance procedure. When expressed in the form of a fraction of reversible pressure recovery, dissipation losses appear to depend strongly on the quality. Their minimum value is observed for a larger quality value when the pressure of the system is increased.

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