Using quasi two-dimensional mathematical model for calculation of the thermal and hydraulic modes tube gas heater

Authors

  • V. V. Tkachova Pridneprovsk State Academy of Civil Engineering and Architecture”, 24-A, Chernishevskogo str., Dnipropetrovsk, Ukraine
  • V. F. Irodov Pridneprovsk State Academy of Civil Engineering and Architecture”, 24-A, Chernishevskogo str., Dnipropetrovsk, Ukraine

Keywords:

tube gas heaters, calculation, reliability, failure – free operation, quasi two dimensional mathematical model, systems of equations

Abstract

Abstract.  Purpose.  Tube  gas  heaters  reliability  (TGH)  poorly  understood.  Study  unit  property  of  reliability  -  failure  –  free  operation is one of the important areas to improve the efficiency of design solutions and quality performance. Known dimensional  mathematical model (TGH) [3]. However, this model does not take into account properties such as the irregularity of heating of the  tube  heater.  The  approach  to  the  use  of  two-dimensional  mathematical  model  of  turbulent  combustion  in  complex  channel  [5,6]  requires rather cumbersome definition of empirical indicators. The proposed by the authors quasi -two-  dimensional  mathematical  model  [4,8]  takes  into  account  the  dependence  of  the  surface  temperature  of  the  heater  not  only  linear,  but  also  on  the  angular  coordinates.  The  calculation  using  the  latest  model  will  provide  the  experimental  dependence  for  further  study  of  the  issues  of  reliability.  Methodology.  Quasi  two-dimensional  mathematical  model  TGH  consists  of  two  groups  of  equations  -  heat  transfer  equations and the equations of motion. The equation of the temperature distribution on the surface of the tubular connection  part  TGH depending on the angular coordinate should be added to the equations of this group. This equation, in our opinion, is expedient  to determine the results of experimental studies. The experiments have vary parameters such as flow rate, diameter and depend ence is represented in a dimensionless form.  Findings.  The method of calculation of the thermal and hydraulic modes TGH allows you to  take a temperature distribution along the length and along the perimeter surface of the heater. In particular temperature val ues may be  obtained in the upper part of the heater surface which is considerably higher than the diametrically opposite direction.  Originality.  The article shows that the quasi two-dimensional mathematical model of the empirical distribution of temperature with dependence  of  the  parameters  used  to  calculate  the  surface  temperature  distribution of  the  heater.  Practical  value.  This  calculation  makes  it  possible to evaluate the possibility of failure due to overheating of the surface of the TGH, which may appear burnouts of its linear  part.

Author Biographies

V. V. Tkachova, Pridneprovsk State Academy of Civil Engineering and Architecture”, 24-A, Chernishevskogo str., Dnipropetrovsk

Cand. Sc. (Tech.), Ass. prof

V. F. Irodov, Pridneprovsk State Academy of Civil Engineering and Architecture”, 24-A, Chernishevskogo str., Dnipropetrovsk

Dr. Sc. (Tech.), Prof.

References

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Published

2016-09-27

Issue

Section

Computer systems and information technologies in education, science and management