High Reynolds Number Flow in Capillary Tube with Spiral/Bend Portion (Experimental Results for Water)

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  • High Reynolds Number Flow in Capillary

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Experimental study on water flow in capillary tubes with straight, bent, or coiled portion is conducted. Stainless tubes with nominal diameter of 0.5mm, 0.25mm, and 0.1mm are examined at several temperatures. Reynolds number ranges from 30 to 16000, where maximum velocity becomes up to 30m/s. Pressure loss of test piece and discharge flow rate are measured to be compared with the results from previous studies. In spite of considerable roughness of capillary inner surface, measured data do not indicate roughness effect explicitly. Laminar friction factors for coiled tubes show the clear dependence on the number of turns in the coil, which cannot be explained by previous studies. Empirical equations for examined capillary contours are obtained.

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