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Q: For straightening and smoothing airflow in a 50-cm-diameter duct, the duct is packed with a ?ohoneycomb?? of thin straws of length 30 cm and diameter 4 mm, as in Fig. The inlet flow is air at 110 kPa and 20°C, moving at an average velocity of 6 m/s. Estimate the pressure drop across the honeycomb.
