International Scientific Journal


Study on the thermal wash multiphase flow and heat transfer characteristics have important significance to reduce energy consumption in wax removal. The thermal washing process of multiphase flow melting characteristics were simulated based on VOF model and RNG k -e turbulence model. The melting temperature and pressure curves of wax were obtained under different initial conditions. The results show that the distribution of temperature in the pipe is uneven due to the action of gravity. Compared with the water temperature, the flow velocity has a greater influence on convection type. When the flow velocity is 0.5 m/s, the flow pattern of liquid wax is mainly suspended flow. When the flow velocity is 2 m/s, the wall flow is observed. The greater speed is or the higher temperature is, the faster melting rate is. And the temperature increment varies with positions of the pipeline. Based on this study, we found suitable conditions of hot wax cleaning, which we could save the cost of natural gas.
PAPER REVISED: 2017-12-21
PAPER ACCEPTED: 2017-12-23
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THERMAL SCIENCE YEAR 2018, VOLUME 22, ISSUE Supplement 2, PAGES [S749 - S758]
  1. Li, C. X., et al., Effect of crude oil composition on wax deposition in crude oil pipeline, Journal of Chemical Engineering, 65(2014), pp. 4571-4578.
  2. Cheng, G. J., Study on heat flow coupled field and temperature monitoring system for oil well thermal washing, M.E.E. thesis,Harbin, China, 2010.
  3. Zhang, Y., Numerical calculation of temperature distribution in wellbore of oil well during thermal washing process, E.M.S. thesis, Daqing, China, 2015.
  4. Fan, J. W., Calculation and application research of thermal wash temperature field of oil well, E.M.S. thesis, Daqing, China, 2010.
  5. Pal, D., et al., Melting in a side heated tall enclosure by a uniformly dissipating heat source, International Journal of Heat and Mass Transfer,2001, pp. 375-387.
  6. Assis, E., et al., Numerical and experimental study of melting in a spherical shell, International Journal of Heat and Mass Transfer, 2007, pp. 1970-1804.
  7. Tan, F. L., et al., Experimental and computational study of constrained melting of phase change materials (PCM) inside a spherical capsule, International Journal of Heat and Mass Transfer,52(2009), pp. 3464-3472.
  8. Khanpour, M., et al, Mesh-free SPH modeling of sediment scouring and flushing, Computers andFluids,126(2016), pp. 67-78.
  9. Liu, X. Y., et al., Numerical simulation of particle deformation in gelled crude oil, Journal of Engineering Thermophysics, 36(2015), pp. 551-554.
  10. Zhu, H. J., et al., A CFD (computational fluid dynamic) simulation for oil leakage from damaged submarine pipeline,Energy,64(2014), pp. 887-899.
  11. Hayat, T, et al., Impact of melting phenomenon in the Falkner-Skan wedge flow of second grade nanofluid: A revised model, Journal of Molecular Liquids,215(2016), pp. 664-670.
  12. Jiang, Y. Y., Preparation of slurry nitrogen and its characteristics of flow and phase change heat transfer in horizontal tubes, E.M.S. thesis, Shanghai, China, 2010.
  13. Long, Y. W., Phase change heat transfer characteristics of ice slurry in tube fin heat exchanger, E.M.S. thesis, Dalian, China, 2016.
  14. Yang, Y. Q., et al., Melt flow and heat transfer in laser drilling, International Journal of Thermal Sciences,107(2016), pp. 141-152.
  15. Shabgard, H., et al., Heat transfer analysis of PCM slurry flow between parallel plates, 99(2016), pp. 895-903.
  16. Ma, Z. W., Zhang, P., Modeling the heat transfer characteristics of flow melting of phase change material slurries in the circular tubes, International Journal of Heat and Mass Transfer,64(2013), pp. 874-881.
  17. Liu, H., et al., Three-dimensional CFD simulation of bubble-melt two-phase flow with air injecting and melt stirring, International Journal of Heat and Fluid Flow,32(2011), pp. 1057-1067.
  18. Ke, B. B., Numerical simulation and heat transfer enhancement of paraffin phase change heat transfer process outside a circular tube,E.M.S. thesis, Jiangsu, China, 2016.
  19. Assis, E., et al., Numerical and experimental study of solidification in a spherical shell, Heat Transfer, 131 (2008), paper no. 024502.

© 2018 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence