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02504 A COMPACT APPARATUS FOR TESTING EROSION-CORROSION UNDER DISTURBED FLOW CONDITIONS CONSISTING OF A ROTATING CYLINDER WITH A STEP

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Product Number: 51300-02504-SG
ISBN: 02504 2002 CP
Author: Srdjan Nesic, Jeremy Bienkowsky, Andrew Purchase, Klaus Bremhorst, Kyung-Soo Yang, and Jong-Yeon Hwa
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Erosion-corrosion is most severe in the vicinity of flow disturbances. In the past, erosion-corrosion under disturbed flow conditions has been studied experimentally in flow loops and numerically by performing flow simulations. In this study a new, compact experimental setup was tested, intended for study of erosion-corrosion under disturbed flow conditions, involving a rotating cylinder geometry with a sudden step. A thorough characterization of this new setup was initiated, involving wall mass transfer measurements complemented with Direct Numerical Simulation of the turbulent flow around it. A large variation of the wall mass transfer rates behind the step was measured similar in character to the one obtained in flow through a sudden pipe expansion. Flow simulations have confirmed that this flow geometry will create a qualitatively similar mean flow pattern as observed in a sudden pipe expansion flow involving flow separation and reattachment. The simulations have also shown that there is a largescale unsteadiness in the turbulent flow structure downstream the step, a fact that might have a significant impact on erosion-corrosion.
Erosion-corrosion is most severe in the vicinity of flow disturbances. In the past, erosion-corrosion under disturbed flow conditions has been studied experimentally in flow loops and numerically by performing flow simulations. In this study a new, compact experimental setup was tested, intended for study of erosion-corrosion under disturbed flow conditions, involving a rotating cylinder geometry with a sudden step. A thorough characterization of this new setup was initiated, involving wall mass transfer measurements complemented with Direct Numerical Simulation of the turbulent flow around it. A large variation of the wall mass transfer rates behind the step was measured similar in character to the one obtained in flow through a sudden pipe expansion. Flow simulations have confirmed that this flow geometry will create a qualitatively similar mean flow pattern as observed in a sudden pipe expansion flow involving flow separation and reattachment. The simulations have also shown that there is a largescale unsteadiness in the turbulent flow structure downstream the step, a fact that might have a significant impact on erosion-corrosion.
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