Pressure drop measurements in the transition region for a circular tube with three different inlet configurations

✍ Scribed by Afshin J. Ghajar; Khushrow F. Madon

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 646 KB
• Volume: 5
• Category: Article
• ISSN: 0894-1777
• DOI: 10.1016/0894-1777(92)90062-a

✦ Synopsis

Pressure drop measurements were made in a horizontal circular straight tube with reentrant, square-edged, and bell-mouth inlets under isothermal flow conditions. The experiments covered a Reynolds number range from about 500 to 15,000. The fully developed skin friction coefficients for the three inlet configurations showed that the range of Reynolds number values for which transition flow exists is 1980-2600 for the reentrant inlet, 2070-2840 for the square-edged inlet, and 2125-3200 for the bell-mouth inlet. A correlation for prediction of the fully developed skin friction coefficient in the transition region for each inlet is recommended. In the entrance region, qualitative results are presented for the variation of laminar apparent friction factor with tube length for different inlets. Available friction factor correlations in the laminar entrance and fully developed transition regions are compared with our experimental data for different inlets.