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Table 1 Characteristics of liquid flow in tubules at night

From: Can Randall’s plug composed of calcium oxalate form via the free particle mechanism?

   Ascending Henle loop Distal tubule Collecting duct
Volume V (m3) 5.07 × 10−12 2.29 × 10−12 5.94 × 10−11
Average radius r (m) 1.16 × 10−5 1.10 × 10−5 2.65 × 10−4
Volumetric flow Q (m3 s−1) 3.98 × 10−14 3.98 × 10−14 1.63 × 10–11#
Average linear velocity uav (m s−1) 9.42 × 10−5 1.05 × 10−4 3.24 × 10–3#
Average transit time of liquid ttr (s) 127 57 0.8 (3.6*)
Reynolds number Re (−) 3.2 × 10−3 3.3 × 10−3 2.1 (0.31#)
  1. Value denoted by asterisk is the transit time if volumetric flow in the CD is equal to the flow rate at the opening, # value at the opening of the CD