scholarly journals Discussion: “Steady Laminar Flow Through Twisted Pipes: Fluid Flow in Square Tubes” and “Steady Laminar Flow Through Twisted Pipes: Heat Transfer in Square Tubes” (Masliyah, J. H., and Nandakumar, K., 1981, ASME J. Heat Transfer, 103, pp. 785–790, 791–796)

1984 ◽  
Vol 106 (2) ◽  
pp. 480-480 ◽  
Author(s):  
Z. G. Xu ◽  
D. N. Fan
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Laminar Flow ◽  
Flow Through ◽  
Steady Laminar

scholarly journals CFD study of heat transfer enhancement and fluid flow characteristics of laminar flow through tube with helical screw tape insert

2019 ◽  
Vol 160 ◽  
pp. 699-706 ◽  
Author(s):  
Mehedi Tusar ◽  
Kazi Ahmed ◽  
Muhammad Bhuiya ◽  
Palash Bhowmik ◽  
Mohammad Rasul ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Laminar Flow ◽  
Heat Transfer Enhancement ◽  
Flow Characteristics ◽  
Transfer Enhancement ◽  
Flow Through ◽  
Fluid Flow Characteristics

Steady Laminar Fluid Flow Through Variable Constrictions in Vascular Tube

1994 ◽  
Vol 116 (1) ◽  
pp. 66-71 ◽  
Author(s):  
T. S. Lee
Keyword(s):  
Reynolds Number ◽  
Fluid Flow ◽  
Laminar Flow ◽  
Recirculation Zone ◽  
Flow Fields ◽  
Laminar Fluid Flow ◽  
Spacing Ratio ◽  
Flow Through ◽  
Steady Laminar

Steady laminar flow fields in the neighborhoods of two consecutive constrictions in a vascular tube were studied for approaching Reynolds number Re in the range of 5 to 200. The upstream stenosis was set at a dimensionless diameter constriction c1 of 0.5 while the downstream stenoses were allowed to vary from c2 = 0.2 to 0.6. The proximity of the constrictions was determined by the spacing ratio of S/D = 1, 2, 3, and ∞. When c2 > c1, a recirculation zone filled the valley between the two constrictions with little changes to the separation and reattachment points as Re was further increased. For c2 < c1 and when Re was increased, the recirculating eddy formed downstream of the first constriction tended to spread beyond the region of the second constriction. This resulted in negative wall vorticity peak occurring in the region of the second constriction for smaller S/D at high Re.

Steady Laminar Flow through Twisted Pipes: Fluid Flow in Square Tubes

1981 ◽  
Vol 103 (4) ◽  
pp. 785-790 ◽  
Author(s):  
J. H. Masliyah ◽  
K. Nandakumar
Keyword(s):  
Laminar Flow ◽  
Reynolds Numbers ◽  
Navier Stokes ◽  
Navier Stokes Equation ◽  
Dissipation Term ◽  
Axial Velocity Profile ◽  
Secondary Motion ◽  
Qualitative Nature ◽  
Flow Through ◽  
Steady Laminar

The Navier-Stokes equation in a rotating frame of reference is solved numerically to obtain the flow field for a steady, fully developed laminar flow of a Newtonian fluid in a twisted tube having a square cross-section. The macroscopic force and energy balance equations and the viscous dissipation term are presented in terms of variables in a rotating reference frame. The computed values of friction factor are presented for dimensionless twist ratios, (i.e., length of tube over a rotation of π radians normalized with respect to half the width of tube) of 20, 10, 5 and 2.5 and for Reynolds numbers up to 2000. The qualitative nature of the axial velocity profile was observed to be unaffected by the swirling motion. The secondary motion was found to be most important near the wall.

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