Hydrodynamics of Steam-Water Two-Phase Flows Through Grooved Walled Passages

¹ Research Laboratory of Technical Self-Diagnostics and Self-Control of Devices and Systems, Department of Scientific and Innovative Activities, South Ural State University, Lenin prospect 76, Chelyabinsk, 454080, Russian Federation.
² Research Institute of Mechanical Engineering. Department of Vibration Testing and Equipment Condition Monitoring, South Ural State University, Lenin prospect 76, Chelyabinsk, 454080, Russian Federation.
³ Discipline of Chemical Engineering, School of Engineering, College of Agriculture, Engineering & Science, Howard Campus, University of KwaZulu-Natal, Glenwood, Durban, South Africa.
⁴ Smart Structural Health Monitoring and Control Lab (SSHMC) Lab, Dongguan University of Technology, D1, Daxue Rd., Songshan Lake, Dongguan, Guangdong Province, P.R. China
⁵ UTBM, IRAMAT UMR 7065-CNRS, Rue de Leupe, CEDEX, 90010 Belfort, France
⁵ University of Dundee, United Kingdom (UK). School of Science and Engineering, Department of Mechanical Engineering, Nethergate, Dundee DD1 4HN, United Kingdom (UK).
⁶ Department of Mechanical and Manufacturing Engineering, Faculty of Engineering, University Malaysia Sarawak (Unimas), 94300 Kota Samarahan, Sarawak, Malaysia.

^a sinitsinvv@susu.ru
^b taranenkopa@susu.ru
^c sanaullahk@ukzn.ac.za
^d* Corresponding author: david.bassir@utbm.fr
^e arigit@unimas.my

Abstract

In this study, we investigated the flow hydrodynamics of mixture of steam and water through a pipe that has grooved walls. The walls were roughened using collars that has circular and squared shapes throughout the inner walls of the flow channel. Our findings indicate that the factors related to the friction of the walls have been associated with wall roughness ranged from 0.6 to 0.63. The velocity deficit near the wall was slightly greater above the smooth walls compared to the rough walls, reflecting the impact of the friction factor. However, the profiles used to quantify the Reynolds normal stresses showed a distinct contrast. In the grooved surface channel, pressure-induced drag dominated, leaving little room for viscous effects and resulting in lower peaks. These stresses were heavily influenced by wall geometry. Notably, in channels with squared grooves, flow profiles were shows a slight decrease compared to those observed over smooth and rough walls.