**Author details**

Trevor Frank Jones TFJ Consulting Ltd, England

\*Address all correspondence to: info@tfjconsulting.com

© 2023 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

*Solid-Liquid Pipeflows – Holdup and the Two-Layer Model DOI: http://dx.doi.org/10.5772/intechopen.112023*
