Document Type


Date of Award


Degree Name

Master of Science in Chemical Engineering - (M.S.)


Chemical Engineering

First Advisor

George C. Keeffe

Second Advisor

C. L. Mantell

Third Advisor

Jerome J. Salamone


The results of a study of pressure drops across a 5/32 inch throat venturi meter and a 5/32 inch thin plate sharp-edged orifice for the horizontal cocurrent, flow of the air-water two-phase two-fluid system in a 3/4 inch pipe under essentially isothermal conditions, are presented. This is the first critical study of two phase flow in a Venturi meter and. in a 5/32" orifice.

Flows of water of 0.1 to 1.7 gallons per minute with air rates in range of 0.00022 lbs/sec. to 0.0092 lbs/sec. of air mixed in were studied. All flows were turbulent when judged with the conventional Reynolds number criteria. It was found that two phase two fluid flaw in this region was not steady but fluctuated.

Predicted pressure drops calculated with the Chenoweth-Martin Correlation (1) gave results which were 50% to 150 too high for the orifice. An improved correlation is presented which gives predicted pressure drops to within 15% of the actual results for 85% of the data calculated, for both the orifice and the Venturi.

It is shown that temperature has important influence on single phase water flow in venturi, a 3.0% increase in pressure drop being observed with temperature rise in tap water trims 3.0°C to 40°C.



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