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CFD Letters
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  This is an Open Access Journal Open Access journal
     ISSN (Print) 2180-1363
     Published by ISSR Journals Homepage  [3 journals]   [SJR: 0.256]   [H-I: 2]
  • Numerical Study of Mixed Convective Cooling in a Ventilated Cavity
           Utilizing a Guide Baffle

    • Authors: Wael El-Maghlany
      Abstract: Laminar mixed convective flow in ventilated square cavity with inlet and outlet ports has been executed. The natural convection effect is attained by heating from the constant flux heat source which is symmetrical located at the bottom wall and cooling from the injected flow. An external Newtonian fluid flow (Air, Pr =0.71) enters the cavity through an opening at the bottom of the left vertical wall and exits from another opening at the top of the right vertical wall, which is creating the forced convection flow conditions. Laminar regime is considered under steady state condition. The governing equations including continuity, momentum, and energy are transformed into non-dimensional form and the resulting partial differential equations are solved by the finite volume technique. In addition, horizontal guide baffle with different locations was attached from the left vertical wall to enhance the cooling effect of the source part. A parametric study was performed presenting the influence of Reynolds' number (50≤Re≤500), Richardson number (0.01≤Ri≤10), and hence the effect of heat flux represented in the Grashof number automatically generated from both values of Reynolds and Richardson numbers. 
      PubDate: 2014-01-31
      Issue No: Vol. 5 (2014)
  • Protection of bend from erosion caused by gas-particle flows in Town
           Border Station

    • Authors: Javad Abolfazli Esfahani, Hamid Reza Karbasian, Aref Fozooni Kangarshahi, Ebrahim Barati
      PubDate: 2013-12-19
      Issue No: Vol. 5 (2013)
  • Numerical Investigation on the Effect of Impeller Trimming on the
           Performance of a Modified

    • Authors: Layth Hasan Jawad, S. Abdullah, R. Zulkifli, W.M. F.W. Mahmood
      Abstract: This study was intended to predict the performance of a modified centrifugal compressor used in turbo charger numerically. In order to increase the performance of the conventional turbocharger compressor’s to boost the pressure in the engine, by the impeller trimming. The compressor impeller was trimmed at the impeller hub and shroud layers, thus generating different trim geometries, and the effect of the trimming on the compressor impeller performance was studied. The flow inside these geometries of a small modified centrifugal compressor with double splitters used as an automotive turbocharger was simulated. Further, the performance of the centrifugal compressor depended on the flow in the impeller and splitters, but the splitters were not continued to the leading edge. If the splitters continued to the leading edge, it would produce sufficient blockage to cause choking at high speed. This research aimed to study and simulate the effect of impeller trimming on the performance of a turbocharger compressor. The simulation was undertaken using CFD analyse on the aerodynamic flow field and to predict performance in terms of pressure ratio, efficiency, mass flow rate and aerodynamic characteristics. According to the results of the simulation, it was observed that the fluid flow into a compressor has been indicated a better understanding. In addition the compressor performance was heavily affected by the impeller modification. Conclusively, it was observed the performance it was greatly affected by the double splitter design and the pressure ratio and air mass flow rate were increased.
      PubDate: 2013-12-18
      Issue No: Vol. 5 (2013)
  • Modelling the Effect of Incompressible Leakage Patterns on Rupture Area in

    • Authors: Mohamed Fahmy Shehadeh, Ali Ismeal Shahata
      Abstract: This paper presents a three-dimensional analysis for rupture area in steel pipeline using a general purpose CFD solver. A model is developed for studying leakage in steel pipes with different hole diameters and different fluid flow properties such as pressures and velocity. Solutions of the distribution of water flow velocity, pressure and turbulence are presented and discussed. The results is shown that there is a direct relation between the maximum velocity, total pressure turbulence intensity and leakage mass flow rate with rupture area in pipes. Finally, the simulation results is showed a good a agreement with experimental results
      PubDate: 2013-12-17
      Issue No: Vol. 5 (2013)
  • Scalar Tuning of a Fluid Solver using Compact Scheme for a Supercomputer
           with a Distributed Memory Architecture

    • Authors: Hikaru Aono, Taku Nonomura, Nobuyuki Iizuka, Takahiko Ohsako, Tomohide Inari, Yasutoshi Hashimoto, Ryoji Takaki, Kozo Fujii
      PubDate: 2013-11-01
      Issue No: Vol. 5 (2013)
  • Effect of Volume Fraction on the Performance and Separation Efficiency of
           a De-oiling Hydrocyclone

    • Authors: Kamel A. Elshorbagy, Amr Mohamed Abdelrazek, Mohamed Elsabaawy
      Abstract: The flow behaviour in hydro-cyclone is quite complex. The complexity of fluid flow in the cyclone is due to the fact that flow in a cyclone is a swirling turbulent multiphase flow. This paper presents a numerical investigation on the effect of volume fraction (percent of phase 2-oil- to the total inlet flow-water + oil-, by volume) on the liquid–liquid hydro-cyclone performance. A mathematical model for the two components of flow is developed using the RNG k-ε model, and employing the Eulerian– Eulerian approach. The flow features were examined in terms of flow field velocity (axial, radial and tangential), pressure drop and separation efficiency. Results indicate that on increasing the volume fraction the static pressure increases, the axial velocity decreases, the radial velocity decreases, and the tangential velocity has almost unaltered. In addition, the separation efficiency is affected by the volume fraction. The increase of volume fraction increases the separation efficiency. However, increasing the volume fraction leads to increase in the separated part of phase 1 (water) and decrease the separated part of phase 2 (oil).
      PubDate: 2013-11-01
      Issue No: Vol. 5 (2013)
  • Cylindrical and Row Trenched Cooling Holes with Alignment Angle of 90
           Degree at Different Blowing Ratios

    • Authors: Ehsan Kianpour, Nor Awadi C Sidik, Mazlan Abdul Wahid
      Abstract: This study was carried out to find out the effects of two different blowing ratios of BR=1.25 and BR=3.18 on the film cooling performance adjacent the combustor endwall, whereas two different cooling holes arrangements as cylindrical and row trenched cooling holes with alignment angle of 90 degree are considered. In this research, a three-dimensional presentation of a true Pratt and Whitney aero-engine was simulated and analyzed with a commercial finite volume package FLUENT 6.2.26 to gain fundamental data. The current study has been performed with Reynolds-averaged Navier-Stokes turbulence model (RANS) on internal cooling passages. This combustor simulator combined the interaction of two rows of dilution jets, which were staggered in the stream wise direction and aligned in the span wise direction. The entire findings of the study declared that with using the row trenched holes near the enwall surface; film cooling effectiveness is doubled compared to the cooling performance of baseline case.
      PubDate: 2013-11-01
      Issue No: Vol. 5 (2013)
  • Comments on 'A generalized lattice Boltzmann method for
           three-dimensional incompressible fluid flow simulation' by Rahmati
           and Ashrafizaadeh

    • Authors: Ridha Djebali, Bittagopal Mondal,
      Abstract: In the present work we’ll present some comments concerning the paper entitled ‘A generalized lattice Boltzmann method for three-dimensional incompressible fluid flow simulation’ published in Journal of Applied Fluid Mechanics (JAFM), vol. 2(1), pp. 71-96 (2009) by Ahmad Reza Rahmati and Mahmud Ashrafizaa. The comments are related to the numerical parameters influencing the accuracy of the presented results such in particularly the computed Nusselt number.
      PubDate: 2013-11-01
      Issue No: Vol. 5 (2013)
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
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