Wavy wall channel

E. FLOW IN A WAVY-WALL CHANNEL - DOMAIN PERTURBATION METHOD ... 

E. Flow in a Wavy-Wall Channel - Domain Perturbation Method ... 

Figure 4-8. A sketch of the flow and wavy-wall channel geometry for motion perpendicular to the grooves in the walls.

Figure 4-9. An illustration of the predicted flow pattern in a wavy-wall channel. The -directional velocity, Eq. (4-153), plotted against x for various values of y.

Wang, C. C., Chen, C. K. Forced convection in a wavy wall channel, Int. J. Heat Mass Transfer 45, (2002)... 

E. M. Sparrow, Heat/mass transfer characteristics for flow in a corrugated wall channel, J. Heat Transfer 99, 187-95 (1977) J. E. O Brien and E. M. Sparrow, Corrugated-duct heat transfer, pressure drop, and flow visualization, J. Heat Transfer 104, 410-16 (1982) G.Wang and S. P. Vanka, Convective heat transfer in periodic wavy passages, Int. J. Heat Mass Transfer Ml, 3219-30 (1995). 

Figure 5.6 Flow pattern map for a gas/liquid flow regime in micro channels. Annular flow wavy annular flow (WA) wavy annular-dry flow (WAD) slug flow bubbly flow annular-dry flow (AD). Transition lines for nitrogen/acetonitrile flows in a triangular channel (224 pm) (solid line). Transition lines for air/water flows in triangular channels (1.097 mm) (dashed lines). Region 2 presents flow conditions in the dual-channel reactor ( ), with the acetonitrile/nitrogen system between the limits of channeling (I) and partially dried walls (III). Flow conditions in rectangular channels for a 32-channel reactor (150 pm) (T) and singlechannel reactor (500 pm) (A) [13].

Heat transfer in sinusoidal corrugated-plate channels was studied for Re up to fJe=1000 and Prandtl numbers between 5 and 150 [15]. Different amplitudes of the wall waviness, a, and the corrugation wave length, X, were studied (Figure 5.8). 

The different flow patterns largely resemble those known from flow in other continuous flow conduits as pipes, tubes, capillaries, and monoliths [29-40]. Bubbly flow, slug flow (Taylor flow), annular, and churn flow are found and a few more intermediate regimes between the ones mentioned. These comprise different gas-liquid configurations such as segmented flow (bubble-train), gas core with encompassing stable thin liquid film, which wets the channel wall, and dynamic wavy liquid films. In case of high gas contents, spray is created with small droplets in... 

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