The results for the mitre, elbow and bend show that the loss coefficient K falls
substantially as the radius of the bend is increased. Many previous experiments have
indicated that, with a value of Re around 2 × 104
, K would be expected to reduce,
from a value of about 1.4 for the mitre bend, to a value around 0.3 when R/D = 3. The
values obtained in this experiment are in good agreement with these expectations.
For the enlargement, Equation (10.6) provides a theoretical value of K. In this case,
this theoretical value is