scholarly journals Erratum: “Steady Laminar Fluid Flow Through Variable Constrictions in Vascular Tube” (Journal of Fluids Engineering, 1994, 116, pp. 66–71)

1994 ◽  
Vol 116 (2) ◽  
pp. 297-297
Author(s):  
T. S. Lu
Keyword(s):  
Fluid Flow ◽  
Laminar Fluid Flow ◽  
Flow Through ◽  
Steady Laminar

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.

scholarly journals NUMERICAL INVESTIGATION OF DEVELOPING LAMINAR FLUID FLOW THROUGH RECTANGULAR ANNULUS DUCT

2020 ◽  
Vol 15 (12) ◽  
Author(s):  
Takwah Talib Hasan
Keyword(s):  
Heat Flux ◽  
Nusselt Number ◽  
Fluid Flow ◽  
Average Nusselt Number ◽  
Constant Heat Flux ◽  
Ansys Fluent ◽  
Constant Length ◽  
Laminar Fluid Flow ◽  
Number Increase ◽  
Flow Through

The laminar fluid flow of water through the annulus duct was investigated numerically by ANSYS fluent version 15.0 with height (2.5, 5, 7.5) cm and constant length (L=60cm). With constant heat flux applied to the outer duct. The heat flux at the range (500,1000,1500,2000) w/m2 and Reynolds number values were ≤ 2300. The problem was 2-D investigated. Results revealed that Nusselt number decrease and the wall temperature increase with the increase of heat flux. Also, the average Nusselt number increase as Re increases. And as the height of the annulus increase, the values of the temperature and the local and average Nusselt number increase.

scholarly journals Entropy Generation in Laminar Fluid Flow through a Circular Pipe

Entropy ◽  
2003 ◽  
Vol 5 (5) ◽  
pp. 404-416 ◽  
Author(s):  
Ahmet Sahin ◽  
Rached Ben-Mansour
Keyword(s):  
Fluid Flow ◽  
Entropy Generation ◽  
Circular Pipe ◽  
Laminar Fluid Flow ◽  
Flow Through

scholarly journals Fluid shear, intercellular stress, and endothelial cell alignment

2015 ◽  
Vol 308 (8) ◽  
pp. C657-C664 ◽  
Author(s):  
Robert Steward ◽  
Dhananjay Tambe ◽  
C. Corey Hardin ◽  
Ramaswamy Krishnan ◽  
Jeffrey J. Fredberg
Keyword(s):  
Fluid Flow ◽  
Endothelial Cell ◽  
Cell Body ◽  
Time Course ◽  
Cell Junctions ◽  
Cell Alignment ◽  
Fluid Shear ◽  
Laminar Fluid Flow ◽  
Steady Laminar

Endothelial cell alignment along the direction of laminar fluid flow is widely understood to be a defining morphological feature of vascular homeostasis. While the role of associated signaling and structural events have been well studied, associated intercellular stresses under laminar fluid shear have remained ill-defined and the role of these stresses in the alignment process has remained obscure. To fill this gap, we report here the tractions as well as the complete in-plane intercellular stress fields measured within the human umbilical vein endothelial cell (HUVEC) monolayer subjected to a steady laminar fluid shear of 1 Pa. Tractions, intercellular stresses, as well as their time course, heterogeneity, and anisotropy, were measured using monolayer traction microscopy and monolayer stress microscopy. Prior to application of laminar fluid flow, intercellular stresses were largely tensile but fluctuated dramatically in space and in time (317 ± 122 Pa). Within 12 h of the onset of laminar fluid flow, the intercellular stresses decreased substantially but continued to fluctuate dramatically (142 ± 84 Pa). Moreover, tractions and intercellular stresses aligned strongly and promptly (within 1 h) along the direction of fluid flow, whereas the endothelial cell body aligned less strongly and substantially more slowly (12 h). Taken together, these results reveal that steady laminar fluid flow induces prompt reduction in magnitude and alignment of tractions and intercellular stress tensor components followed by the retarded elongation and alignment of the endothelial cell body. Appreciably smaller intercellular stresses supported by cell-cell junctions logically favor smaller incidence of gap formation and thus improved barrier integrity.

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