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NUMERICAL SIMULATION OF CONVECTIVE TRANSPORT OF FLY ASH-WATER SLURRY IN HORIZONTAL PIPE BENDS

卷 27, 册 2-4, 2015, pp. 159-186
DOI: 10.1615/MultScienTechn.v27.i2-4.50
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摘要

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.

对本文的引用
  1. Bhusan Nayak Bibhuti, Chatterjee Dipankar, Assessment of Mixture and Eulerian Multiphase Models in Predicting the Thermo-Fluidic Transport Characteristics for Fly Ash-Water Slurry Flow in Straight Horizontal Pipeline, Heat Transfer Engineering, 40, 8, 2019. Crossref

  2. Singh Jatinder Pal, Kumar Satish, Mohapatra S.K., Simulation and optimization of coal-water slurry suspension flow through 90° pipe bend using CFD, International Journal of Coal Preparation and Utilization, 41, 6, 2021. Crossref

  3. Dutta Prasun, Nandi Nityananda, Numerical Study on Turbulent Separation Reattachment Flow in Pipe Bends with Different Small Curvature Ratio, Journal of The Institution of Engineers (India): Series C, 100, 6, 2019. Crossref

  4. Cai Lingling, Mi Sha, Luo Chun, Liu Zhiqiang, Numerical investigation on heat and mass transfer characteristics of ice slurry in pulsating flow, International Journal of Heat and Mass Transfer, 189, 2022. Crossref

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