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Multiphase Science and Technology
SJR: 0.124 SNIP: 0.222 CiteScore™: 0.26

ISSN Print: 0276-1459
ISSN Online: 1943-6181

Multiphase Science and Technology

DOI: 10.1615/MultScienTechn.v27.i2-4.50
pages 159-186


Bibhuti Bhusan Nayak
Department of Mechanical Engineering, National Institute of Technology, Durgapur, Durgapur-713209, India
Dipankar Chatterjee
Academy of Scientific and Innovative Research (AcSIR), CSIR-Central Mechanical Engineering Research Institute, Durgapur-713209, India; Advanced Design and Analysis Group, CSIR-Central Mechanical Engineering Research Institute Durgapur-713209, India
Amar Nath Mullick
Department of Mechanical Engineering, National Institute of Technology, Durgapur, Durgapur-713209, India


A 3D numerical study is conducted to analyze the thermo-fluidic transport associated with the flow of water–fly ash slurry in 90 deg curved horizontal pipes having different radius ratios (ratio between radius of curvature and radius of pipe) of 2.98 and 5.6. The above phenomena in bends is also compared with straight pipe of the same length and diameter for the flow of spherical fly ash particle of sizes 13 and 34 μm at velocities ranging between 1 and 5 m/s and particle concentrations within 10−50% by volume for each velocity. The simulation is carried out by deploying a Eulerian multiphase model available in the commercial computational fluid dynamics code Ansys Fluent. The pipe wall is kept at an isothermal condition of 400 K, whereas the slurry enters the pipeline at a temperature of 300 K. The results indicate that the pipes having bends enhance the heat transfer performance at the expense of the increased pressure drop compared to the straight pipes and also the pressure drop and heat transfer increase with decreasing radius of curvature due to the increase of the secondary flow in the pipe bends. It is also observed that the pressure drop is always greater when the slurry contains larger size particles. On the contrary, the heat transfer coefficient of the slurry having a smaller size of particles is found more in comparison to the larger-size particle slurry.