Corrugated ducts

Asako, Y, Faghei, M., Finite-volume solutions for laminar flow and heat transfer in a corrugated duct, J. Heat Transfer 109 (1987) 627-634. 

D.F. Sherony and C.W. Solbrig, Analytical investigation of heat or mass transfer and friction factors in corrugated duct heat or mass exchanger, Int. J. Heat Mass Transfer 73 145 (1970). 

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). 

Three corrugated ducts are schematically shown in the insets of Fig. 5.59. Hu and Chang [265] have analyzed the / Re for fully developed laminar flow in circumferentially corrugated circular ducts with n sinusoidal corrugations over the circumference as shown in Fig. 5.59, inset a, for e = da = 0.06. The perimeter and hydraulic diameter of these ducts must be evaluated numerically. However, their free flow area Ac is given by Ac = m2(l + 0.5e2). 

A comparison of/Re for these three types of corrugated ducts with e = 0.06 is displayed in Fig. 5.59. 

E. M. Sparrow, and M. Charmchi, Heat Transfer and Fluid Flow Characteristics of Spanwise-Periodic Corrugated Ducts, Int. J. Heat Mass Transfer, (23) 471-481,1980. 

Under-the-hood parts, ventilation and air conditioning units, battery boxes, air ducts, air vents, ventilation nozzles, fan blades, fan bases, fan shrouds, heating device housings, belt covers, corrugated sheaths for wires and cables, windscreen washer parts. .. 

Focke WW, Knibbe PG. Flow visualization in parallel ducts with corrugated walls. J Fluid Mech 1986 165 73-77. 

Figure 6. Visualization of mass transfer in monolith structures (flow from left to right). Top Corrugated packing bottom Square duct monolith [9],...

The sine ducts were chosen for this analysis because they appear to be a very good representation of the wrapped or corrugated structure (1). The derivations of the geometric surface area and open frontal area of this structure are based on the equation for a sine curve ... 

The / Re, NuHi, and NuH2 values determined by Hu and Chang [265] for circumferentially corrugated circular ducts with sinusoidal corrugations are presented in Table 5.63 as functions... 

FIGURE 5.59 Fully developed friction factors for circumferentially corrugated circular ducts [2]. 

Schenkel [279] has determined the fully developed friction factors for circular ducts with semicircular corrugations, as that shown in Fig. 5.59, inset b. For this kind of duct,... 

TABLE 5.63 Fully Developed Friction Factors and Nusselt Numbers for Circumferentially Corrugated Circular Ducts With Sinusoidal Corrugations [1]... 

The radius of the semicircular corrugation is a sin 0. The / Re values for ducts with semicircular corrugations can be determined using the following expression given by Schenkel [279] ... 

Parallel Plate Ducts With Spanwise Periodic Corrugations at One Wall... 

Two types of corrugations (triangular and rectangular) in parallel plate ducts are displayed in the insets of Figs. 5.60 and 5.61, respectively. Sparrow and Charmchi [290] have obtained the solutions for fully developed laminar flow in these ducts. The flow in the duct is considered to be perpendicular to the plane of the paper. Both ducts are assumed to be infinite in the span-... 

FIGURE 5.60 Fully developed friction factors and Nusselt numbers for flat ducts with span wise-periodic triangular corrugations at one wall [290],... 

The cross-sectional area and perimeter of a flat duct with spanwise triangular corrugation can be found by ... 

Fully developed laminar flow and heat transfer in a parallel plate duct with spanwise-periodic rectangular corrugations at one wall have been investigated by Sparrow and Chukaev [291]. The end effect is also ignored in their analysis. The fully developed / Re is shown in Fig. 5.61, which is based on the results reported by Sparrow and Chukaev [291] and the extension by Shah and Bhatti [2]. The heat transfer characteristics for the three pairs of geometric parameters can be found in Sparrow and Chukaev [291]. 

The non-fluid, non-critical containment requirements of these products mean that polymer compound costs and production costs can be minimised. Underground cable and telecommunication ducts are produced as variants of minimum mechanical specification drainage pipes. Where high flexibility is required, to allow cabling around tortuous paths in equipment and buildings, then corrugated pipes are used. Since there is no fluid flow... 

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