Abstract
Two phase pressure loss data are presented for angles from vertical upward to vertical downward for co-current air-water flow in a 4.55 cm diameter pipe operating at about atmospheric pressure. Detailed comparison with data from the literature indicated a substantial measure of agreement and showed that the method of data presentation suggested eliminates any effect on pressure loss of diameter, liquid density and system, but not that of liquid phase viscosity: Specific details are given on aspects of the measured frictional pressure loss from which it is deduced how energy losses can be minimised in two phase systems. In particular a total flow velocity of 15 ms −1 is recommended for most flow conditions in order to give a balance between flow capacity of the equipment and pressure loss.
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