International Journal For Multidisciplinary Research

E-ISSN: 2582-2160   •   Impact Factor: 9.24

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Volume 8 Issue 2
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Experimental Investigation of Coefficient of Discharge for a Venturimeter: Effect of Flow Rate, Differential Pressure, and Geometric Parameters

Author(s) Mr. Akash Sudhan R, Mr. Madhanvishwa B, Mr. Praveen S, Mr. Manikandan R
Country India
Abstract The venturimeter is one of the most widely employed differential-pressure-based flow-measuring devices in industrial and hydraulic engineering. Despite its apparent simplicity, the discharge coefficient (Cd) is sensitive to several interrelated factors including Reynolds number, throat-to-inlet diameter ratio (beta ratio), upstream flow conditioning, fluid viscosity, and surface roughness. The present study undertakes a systematic experimental investigation to determine the coefficient of discharge for a standard venturimeter with a throat-to-pipe diameter ratio of 0.5. A series of five controlled trials were conducted by varying the volumetric flow rate while recording differential manometer readings and the corresponding actual discharge via the volumetric collection method. The theoretical discharge was computed using the standard Bernoulli-based continuity equation, and the coefficient of discharge was evaluated for each trial. The average value of Cd was found to be 0.866, consistent with reported literature values for moderate Reynolds number flows. The results demonstrate that Cd increases slightly with increasing flow rate, suggesting Reynolds number dependence. The findings reinforce the necessity of empirical calibration for accurate flow measurement in industrial applications.
Keywords Venturimeter, Coefficient of Discharge, Differential Pressure, Bernoulli's Theorem, Flow Measurement, Reynolds Number
Field Engineering
Published In Volume 8, Issue 2, March-April 2026
Published On 2026-04-12
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E-ISSN 2582-2160
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