Experimental assessment of local void fraction and flow development in a U-bend piping system for air-water two-phase flow

E Kükrer, N Eskin - International Journal of Multiphase Flow, 2023 - Elsevier
This paper presents an experimental investigation of air-water flow in a complete piping
system, covering the two-phase flow development in injector, upstream, U-bend and …

Experimental Study on Gas–Liquid Two-Phase Flow Upstream and Downstream of U-Bends

X Ma, Z Gu, D Ni, C Li, W Zhang, F Zhang, M Tian - Processes, 2024 - mdpi.com
In this study, the influence of U-bends on the flow and pressure propagation characteristics
of a gas–liquid two-phase flow in upstream and downstream straight pipes was investigated …

Pressure drops of air-water two-phase flows in horizontal U-bends

K Hayashi, J Kazi, N Yoshida, A Tomiyama - International Journal of …, 2020 - Elsevier
Pressure drops in horizontally aligned U-bends were measured for air-water bubbly, plug,
slug and annular flows to examine the applicability of available correlations to the data. The …

Flow pattern identification for two-phase flow in a U-bend and its contiguous straight tubes

X Ma, M Tian, J Zhang, L Tang, F Liu - Experimental Thermal and Fluid …, 2018 - Elsevier
Gas-liquid two-phase flow in curved channels is widely found in various heat exchangers
and transport pipes. The fluid flow and heat transfer characteristics are closely related to flow …

An entropy measure-based study on flow pattern of gas–liquid two-phase flow in a U-Tube

H Hu, P Li, Q Wang, J Wang - Chemical Engineering Research and Design, 2024 - Elsevier
U-tubes are widely applied in gas–liquid two-phase transportation in chemical engineering.
The diverse flow patterns within these tubes significantly affect the pressure loss, heat …

Developing air–water flow downstream of a vertical 180° return bend

PM de Oliveira, E Strle, JR Barbosa Jr - International journal of multiphase …, 2014 - Elsevier
The importance of developing two-phase flow downstream of return bends has been
brought about by several authors wishing to quantify irreversible losses in singularities. In a …

Relative permittivity of mixtures of R-134a and R-1234yf and a polyol ester lubricating oil

PC Sedrez, JR Barbosa Jr - International Journal of Refrigeration, 2015 - Elsevier
The relative permittivity (dielectric constant) of mixtures of a polyol ester (POE) ISO VG 10
lubricating oil and refrigerants R-134a and R-1234yf was evaluated experimentally for …

Intermittent flow initiation in a horizontal tube: quantitative visualization and CFD analysis

CAS Costa, PM de Oliveira, JR Barbosa Jr - Journal of the Brazilian …, 2018 - Springer
The onset of slugging in stratified gas–liquid flow in a 26.4-mm ID horizontal pipe was
investigated experimentally using a high-speed digital video processing technique. Spatio …

Water–air flow in straight pipes and across 90∘ sharp-angled mitre elbows

WTM Al-Tameemi, P Ricco - International Journal of Multiphase Flow, 2019 - Elsevier
Water–air flow in horizontal and vertical straight pipes and through 90∘ sharp-angled mitre
elbows is investigated by visualizing the flow patterns by means of a high-precision camera …

Void Fraction of Air-Water Two-Phase Flows in a Vertically Placed Horizontal U-Bend

K Hayashi, S Yasui, R Kurimoto… - Heat Transfer …, 2024 - Taylor & Francis
Experiments on air-water two-phase flows in a horizontal U-bend placed in the vertical plane
were carried out to investigate effects of pipe bending on the void fraction. The inner …