Bends, Loss of Pressure Head Due To
Bends, Loss of Pressure Head Due To : Wherever the direction of motion of a flow is abruptly changed, as at a sharp bend or elbow, a loss of head is experienced which appears to be due to the formation of a vena contracta on passing the bend or elbow and to the subsequent enlargement and shock which then takes place. With an easy bend the velocity at the bend is obviously greater at the inside and experiments have shown that the loss due to the bend does not occur so much in the bend as in the portion of the straight pipe immediately following, where the equalisation of velocities gives rise to eddy production. Caisson disease, the painful after-effects of deep-sea work sometimes experienced by divers, is often known as "the bends"
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