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Title: Flowmeter Installation Effects Due To Several Elbow Configurations
Author: G. E. Mattingly And T. T. Yeh
Source: 1990 International Symposium on Fluid Flow Measurement
Year Published: 1990
Abstract: This paper presents experimental results for the decay of pipe elbowproduced swirl in pipeflows and its effects on flowmeter measurement accuracy. Experiments include the decay of swirl produced by single and double elbow configurations for pipe diameter Reynolds numbers of 10* to 105 using water in a 2 in. diameter facility at NIST in Gaithersburg, MD. Results show that different types of swirl are produced by the different piping configurations. The swirl decay is found to be dependent on the type of swirl and the pipe Reynolds number. At high Reynolds number very long lengths of straight, constant diameter pipe are required to dissipate the single eddy type swirl that is produced by the two elbows-out-of-plane configuration. Without flow conditioning, it is concluded that the specifications of upstream pipe lengths in the current flowmetering standards may not be sufficient to achieve the desired flow metering accuracy.


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