The maximum ("freak") fluid/wall interaction energy densities to the wall in some highly disturbed single- and two-phase flow regimes have been quantified. Experimental tools to simulate disturbed flow conditions were the submerged jet and the gas-pulsed submerged jet, allowing a wide range of liquid and gas velocities. The maximum hydrodynamic interaction energies between flowing liquids and solid walls in single- and two-phase flow depend on both liquid and gas velocity and increase with increasing superficial velocities. It is shown that addition of tetradecyltrimethylammonium bromide (C-14 Quat) can significantly reduce both freak energy densities as well as wall shear stresses encountered under the same flow intensities. In case of single-phase flow the presence of 1 mM C-14 Quat decreased the freak energy density perpendicular to the wall below the fracture stress of protective scales and hence prevent flow induced localized corrosion.

Subject
Microelectrodes, Diffusion, Additives, Nozzles, Flow velocity, Walls, Wall shear stress, Gas velocity, Density, Liquids, Current densities, Superficial liquid velocity, Risk reduction
Keywords:
flow-induced localized corrosion (FILC), jet impingement, gas-pulsed jet, drag reduction, single-phase flow, two-phase flow, CO2 corrosion, corrosion inhibitors, flow improving additives, freak energy density
© 2007 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
2007
Association for Materials Protection and Performance (AMPP)
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