Heat Transfer in Rectangular, Trapezoidal and Triangular Ducts

2 Heat Transfer in Rectangular, Trapezoidal and Triangular Ducts 

The schemes of the test sections reported in the literature are shown in Fig. 4.5. The geometrical parameters are presented in Tables 4.4 and 4.5. Peng and Peterson (1996) investigated experimentally the single-phase forced convective heat transfer 

Author Number of channels in the test section Heating length Lii [mm] Hydraulic diameter [pm] Dimensionless length Lh/4h Reynolds number Re 

Warrier et al. (2002) conducted experiments of forced convection in small rectangular channels using FC-84 as the test fluid. The test section consisted of five parallel channels with hydraulic diameter = 0.75 mm and length-to-diameter ratio Lh/r/h = 433.5 (Fig. 4.5d and Table 4.4). The experiments were performed with uniform heat fluxes applied to the top and bottom surfaces. The wall heat flux was calculated using the total surface area of the flow channels. Variation of single-phase Nusselt number with dimensionless axial distance is shown in Fig. 4.6b. The numerical results presented by Kays and Crawford (1993) are also shown in Fig. 4.6b. The measured values agree quite well with the numerical results. 

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