The flow behavior is affected by both the tube shape and by the flow conditions (a maximum velocity of about 1.4 m.s~(-1)). The tube configuration yields a three-dimensional flow with important gradient of the flow quantities in both the streamwise and cross-wise directions. The endothelial...
Hi there, this is a really novice question: would one specify the friction acting against the fluid flow in the wall function specification? That is, for some given patch specified in the wall function file, would one specifiy the friction in the 'value' field? Thank you for taking the ti...
The distribution of wall shear stress and velocity in laminar steady flow has been experimentally studied in a model right-angle branch, in which the side branch bifurcates at a right-angle from the trunk. The branch model has a radius of curvature at the upstream corner and a square edge...
Two-phase pressure driven laminar stratified pipe flow is studied with emphasis on the wall and interfacial shear stresses. The basic solution of the Navier–Stokes equations is recast into a simpler form, alleviating physical interpretation and constituting a convenient basis for further developments. ...
WSS was calculated using the Poiseuillian parabolic model of velocity distribution across the arterial lumen based on the assumption of laminar blood flow, according to the following formulae [17, 18]: PeakWSS=8×μ×Vpeak/SD MeanWSS=8×μ×Vmean/DD where μ is blood viscosity, assumed to ...
It is also noted that when the wall shear stress is lower than a certain value for a given drilling fluid, the apparent flow curves for different sizes of gaps coincide, which suggests that wall slip starts at a critical wall shear stress for a given barite-weighted ultrahigh density drilling...
The flow patterns are classified into three types, i. e., quasi-steady, intermediate, and inertia dominant ones with respect to the dimensionless frequency ω' and the limits between these three regions are determined. An alternative analytical representation for wall shear stress τ_w including ...
The target value and fluid properties are known a priori, so we need to calculate the frictional velocity as given above. The wall shear stress, can be calculated from skin friction coefficient, is such that: Thus to calculate we need to know, there are empirical for...
average shear stressandfriction factor. Friction factor is used to investigate the pressure drop along the length of the pipe. The contours of wall function are also presented to investigate the effect of enhanced wall treatment on a fluid flow. A maximum Reynolds number is also found for which...
An apparent shear stress vs. apparent shear rate plot is used to identify the melt fracture phenomena. According to Ramamurthy in Journal of Rheology, 30(2), 337-357, 1986, above a certain critical flow rate, the observed extrudate irregularities may be broadly classified into two main types:...