Inlet configurations circular

A. J. Ghajar and K. F. Madon. Pressure Drop Measurements in the Dramsidon Region for a Circular Tlibe with Three Different Inlet Configurations." Experimental Thermal and Fluid Science, Vol. 5 (1992), pp. 129-135. 

A. J. Ghajar and L. M. Tam, Heat Transfer Measurements and Correlations in the Transition Region for a Circular Tube with Three Different Inlet Configurations, Exp. Thermal and Fluid Sci., Vol. 8, pp. 79-90,1994. 

Fig. 1.3.8. Side and top views of the four most used inlet configurations, a circular or pipe inlet, b slot (also called tangential ) inlet, c wrap-around inlet, and d axial inlet with swirl vanes...

Figure 5.4 Schematic of the geometrical configuration for hydrogen-air flame and sofid fuel. The geometry corresponds to the experimental setup. The initial shape of the HED fuel was a circular arc segment as shown above. The relevant material properties air density = 1.91 kg/m , hydrogen density = 0.0898 kg/m . For the turbulent quantities at the inlet k = (O.OSf/miet) = 9.59 (m/s), = C fc / /(0.03Liniet) = 6360 m /s , jjkt = Cfe = 0.00248 kg/ms. For the fuel sample, m.p. is 450 K, latent heat of fusion is 72.7 J/g. Dimensions in mm. Air inlet velocity 103.3 m/s, hydrogen injection velocity 800 m/s...

The shape of the outlet is the next consideration, in particular whether it should be circular, square or elongated. If there is a need to interface with downstream equipment such as a standpipe, this often requires the outlet to be circular because most standpipes are circular (to be able to effectively withstand explosion pressures). If the vessel is feeding into a pressurised environment, either a standpipe or a special type of feeder may be required, either of which may limit the choice of outlet configuration. Another aspect is the flexibility of location of the inlet point to downstream equipment, for example a conveyor or process vessel. If this downstream inlet is offset from the vessel centreline, a circular or square outlet will have to be followed by a conveyor or sloping chute, either of which may be unacceptable. Using an elongated outlet with a screw or belt feeder may be a better choice. 

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