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Appropriate Rotating Cage Speed for Testing Inhibitors Under Field Simulated Flow Conditions

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This paper presents preliminary computational fluid dynamics and experimental results from a systematic study designed to show how the above mentioned empirical “rotating cage” equation correlates with the average or maximum wall shear stress on the rotating coupons, at different conditions.

Product Number: 51317--9148-SG
ISBN: 9148 2017 CP
Author: Xiaoji Li
Publication Date: 2017
Industry: Science of Corrosion
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The rotating cage (RC) has been widely used for evaluating the performance of corrosion inhibitors in CO2 and H2S containing systems at high temperatures and pressures under flow conditions. The RC methodology has several practical advantages for assessing uniform and localized corrosion and has shown to be a more stringent test than others typically used since some inhibitors (at a given concentration) loose effectiveness beyond a critical flow intensity.Wall shear stress (WSS) which could be related to mass-transfer coefficient is typically used to establish the appropriate RC velocity for simulating a field condition (e.g. pipe flow). The empirical equation included in ASTM G170-06 is commonly used for calculating the WSS of RC under homogeneous flow. However it has been shown using Computational Fluid Dynamic (CFD) calculations and experimental measurement that the WSS can vary significantly with the location on each of the coupons mounted in the RC. This paper presents CFD and experimental results from a systematic study designed to show how the above mentioned empirical RC equation correlates with the average or maximum WSS on the rotating coupons at different conditions.

Key words: Rotating Cage, Wall Shear Stress, Computational Fluid Dynamic, VOF, Multiphase Flow

 

The rotating cage (RC) has been widely used for evaluating the performance of corrosion inhibitors in CO2 and H2S containing systems at high temperatures and pressures under flow conditions. The RC methodology has several practical advantages for assessing uniform and localized corrosion and has shown to be a more stringent test than others typically used since some inhibitors (at a given concentration) loose effectiveness beyond a critical flow intensity.Wall shear stress (WSS) which could be related to mass-transfer coefficient is typically used to establish the appropriate RC velocity for simulating a field condition (e.g. pipe flow). The empirical equation included in ASTM G170-06 is commonly used for calculating the WSS of RC under homogeneous flow. However it has been shown using Computational Fluid Dynamic (CFD) calculations and experimental measurement that the WSS can vary significantly with the location on each of the coupons mounted in the RC. This paper presents CFD and experimental results from a systematic study designed to show how the above mentioned empirical RC equation correlates with the average or maximum WSS on the rotating coupons at different conditions.

Key words: Rotating Cage, Wall Shear Stress, Computational Fluid Dynamic, VOF, Multiphase Flow

 

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