Discharge Measurement by Thermal Dilution

by Ingrid M. Kattnig, Water Engineering & Technology, Inc, United States,
Steven R. Abt, Water Engineering & Technology, Inc, United States,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering


A flume study was conducted to develop and improve the thermal dilution method of discharge measurement in trapezodial channels. The study was performed in an indoor channel with dischages ranging from 2 cfs to 4 cfs and Froude numbers ranging from 0.28 to 0.56. Improved vertical mixing was achieved through the use of a passive turbulence inducer placed perpendicular to the flow. The mixing distance required for the injectate to be adequately mixed in the flow was a function of the flow depth and the channel roughness expressed in terms of Manning's n.

Subject Headings: Thermal pollution | Water discharge measurement | Dilution | Channel flow | Temperature measurement | Temperature distribution | Flow measurement | Fluid flow

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