Circular sector ducts

A schematic drawing of a circular sector duct is presented in Fig. 5.54. The fully developed/Re and Nu for circular sector ducts have been obtained by Eckert and Irvine [280], Sparrow and Haji-Sheikh [174], Hu and Chang [265], and Ben-Ali et al. [281]. The results are summarized in Table 5.57. 

TABLE 5.57 Fully Developed/Re, K(oo), and Nu for Laminar Flow in a Circular Sector Duct... 

TABLE 5.58 Flow Parameters for Hydrodynamically Developing Flow in Circular Sector Ducts [282]... 

E. M. Sparrow, and A. Haji-Sheikh, Laminar Heat Transfer and Pressure Drop in Isosceles Triangular, Right Triangular, and Circular Sector Ducts, /. Heat Transfer, (87) 426-427,1965. 

T. M. Ben-Ali, H. M. Soliman, and E. K. Zariffeh, Further Results for Laminar Heat Transfer in Annular Section and Circular Sector Ducts, J. Heal Transfer, (111) 1090-1093,1989. 

The fuel and air mixture leaves the vaporizer and is fed to the combustor assembly, which consists of a diffuser, plenum with flow conditioning, nozzle, and combustor test section. The diffuser transits the flow from a 50.8-millimeter circular duct to a 160 X 120 mm rectangular-shaped plenum. The flow conditioning consists of two perforated plates, which enhance the flow uniformity and serve as effective flame arresters. The two-dimensional nozzle is constructed from sectors of a large-radius pipe and has an area ratio of 6 1. Pitot probe surveys showed that this setup produced a uniform top-hat velocity distribution across the area of the nozzle exit [2],... 

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