Regime laminar

From this point on, it s some very simple algebra. You can solve equation 5 for u, and then substitute an expression in for Cq for each of the three flow regimes (laminar, turbulent and intermediate). 

L /TP L /G where Yl and Yg are read from Fig. 6-26 as functions of X. The curve labels refer to the flow regime (laminar or turbulent) found for each of the phases flowing alone. The common turbulent-turbulent case is approximated well by... 

After the emulsion viscosity is estimated, friction factor charts may be used directly to determine the flow regime (laminar or turbulent) and the pressure gradient. Emulsion viscosity may be used as an input to a standard pipeline model. Nevertheless, it is strongly recommended that pilot-plant testing be completed on new crude oils before commercial application. 

Turbulent motions are irregular and seemingly unpredictable. This is the most spectacular characteristic which distinguishes turbulent flows from laminar flows. The first scientific study of turbulence, performed by Reynolds [126], relates to this difference. Reynolds did study flows through pipes of constant diameter and by using the method of color bands clearly established that there are two fundamentally different flow regimes, laminar and turbulent flows. Reynolds also determined the conditions under which transition took place. This is now described in terms of the critical Reynolds number. The Reynolds number used in modeling fluid flow is thus named after him. 

Regime Laminar, viscous forces, LV Turbulent, viscous forces, TV Turbulent, inertial forces, TI... 

Fluid flow is generally categorized into two flow regimes laminar and turbulent. Laminar flow is characterized by smooth and constant fluid motion, whereas turbulent flow is characterized by vortices and flow fluctuations. Physically, the two regimes differ in terms of the relative importance of viscous and inertial forces. The relative importance of these two types of forces for a given flow condition, or to what extent the fluid is laminar, is measured by the Reynolds number Re) ... 

Unlike other equations in the table, this equation applies to all three flow regimes—laminar, transition, and turbulent. Its predictions for laminar flow are in agreement with /= 16/Re. The predictions for transition flow are subject to some uncertainty. However, the predictions for turbulent flow are comparable with those rendered by the preceding equation. 

Observed flow regimes laminar (L), laminar with entrainment (LE), partially mixed (PM), partially mixed with entrainment (PME), highly mixed (HM). 

The flow in mixed tanks can be characterised by two distinct regimes laminar (Re < 10), and fiilly turbulent (Re > 10000). In laminar flow there is a linear relation between power and viscosity expressed by Np=Ki /Re. As a result the power can be determined with the following relation ... 

Type of flow regime (laminar versus turbulent, turbulent being better). 

In Eq. (10.5) is the pipe friction factor. It depends, for example on the flow regime (laminar or turbulent), pipe roughness and built-in devices. The factor a is... 

Heat transfer drops off> rate than expected and Ap increases faster than expected fouling because of oversized kettle reboiler on distillation column or change in pH or flow regime laminar when design was turbulent or higher level of contamination in fluids or crud carry over from upstream equipment (e.g. silica from catalyst in upstream reactor) or compensation for oversize by reduced coolant flow-rate. 

Residence time distribution can be an important issue in the selection process. Microreactors usually operate at Reynolds numbers lower than 200. In this regime, laminar flow prevails and mass transfer is dominated by molecular diffusion. An injected substance in the channel will dissipate caused by the flow profile in the channel. Hence the input signal will be broadened until it reaches the exit of the channel (Figure 3.2). The extent of such a distribution depends on the channel design. In microchannels the mixing process can then be described by the Fourier number (no axial diffusion, dominating radial diffusion D ). A high Fourier Po number leads to a narrow residence time distribution ... 

Flow regime, laminar A constant and directional flow of fluid across a clean workbench. The flow is usually parallel to the surface of the bench. 

The idea of many miniature shear flows that are rotating in space and being convected across a probe seems like a useful one. This may allow us to make a link between the three flow regimes (laminar, transitional, and turbulent), but before adopting it, let s clarify the assumptions that underlie this model. First, we ve assumed that the eddies do not change as they are convected along in the... 

Flow regimes laminar Turbulent Different hydrodynamic effects... 

Regime - Laminar, viscous Turbulent, viscous Turbulent, inertial... 

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