## THERMAL SCIENCE

International Scientific Journal

### COMPUTATIONAL FLUID DYNAMIC ANALYSIS ON THE EFFECT OF PARTICLES DENSITY AND BODY DIAMETER IN A TANGENTIAL INLET CYCLONE HEAT EXCHANGER

**ABSTRACT**

This work presents the effect of particles density and body diameter on hold up mass and heat transfer rate in cyclone heat exchanger by using CFD analysis. Performance of cyclone heat exchanger is based on operational and geometrical parameters which mainly depend on inlet air velocity and solid particles parameters. Present work studies the effect of particles density, diameter of cyclone, inlet air velocity, and temperature on performance of cyclone heat exchanger. The RNG k-ε turbulence model was adopted in ANSYS FLUENT 12.0 software to analyze the flow field and discrete phase model is adopted to predict tracking of solid particles in cyclone. Solid particles density ranges from 2050 to 8950 kg/m3 for different materials fed at 0.5 g/s flow rate and inlet air velocity ranges from 5 to 25 m/s at three inlet air temperature 373, 473, and 573 K for 100, 200, and 300 mm body diameter cyclone heat exchangers. Results conclude that increase in diameter of cyclone increases hold up mass and heat transfer rate whereas increase in density of particles decreases the hold up mass and heat transfer rate. Experimental set-up was built for Stairmand high efficiency cyclone and good agreement was found between simulation and experimental result. New correlation was proposed for non-dimensional hold up mass. Correlation compared with experimental hold up mass and predicts experimental value within an error band of –3 to 6%.

**KEYWORDS**

PAPER SUBMITTED: 2015-11-05

PAPER REVISED: 2016-02-22

PAPER ACCEPTED: 2016-02-26

PUBLISHED ONLINE: 2016-03-12

**THERMAL SCIENCE** YEAR

**2017**, VOLUME

**21**, ISSUE

**6**, PAGES [2883 - 2895]

- Azadi, M., et al., A CFD study of theeffect of cyclone size on its performance parameters, Journal of Hazardous materials,182, (2010), 1-3,pp. 835-841.
- Wang, B., et al., Numerical study of gas-solid flow in a cyclone separator, Applied Mathematical Modelling, 30, (2006), 11, pp. 1326-1342.
- FeritFicici, et al., The effects of Vortex finder on the pressure drop in Cyclone separators, International Journal of the Physical Sciences, 5, (2010), 6, pp.804-813.
- Elsayed, K., Lacor, C., Optimization of the cyclone separator geometry for minimum pressure drop using mathematical models and CFD simulations, chemical Engineering science, 65, (2010), 22, pp. 6048-6058.
- Chen, J., Shi, M., A universal model to calculate cyclone pressure drop, powder technology, 171 (2007), 3, pp. 181-191.
- Elsayed, K., Lacor, C., The effect of cyclone inlet dimensions on the flow pattern and performance, Applied Mathematical Modelling, 35, (2011), 4, pp. 1952-1968.
- Elsayed, K., Lacor, C., The effect of the dust outlet geometry on the performance and hydrodynamics of gas cyclones, Computers &Fluids, 68, (2012), pp. 134-147.
- Elsayed, K., Lacor, C., Numerical modelling of the flow field and performance in cyclones of different cone-tip diameters, Computers &Fluids, 51, (2011), 1, pp. 48-59.
- Elsayed, K., Lacor, C., The effect of cyclone vortex finder dimensions on the flow pattern and performance using LES, Computers & Fluids, 71 (2013), pp. 224-239.
- Karagoz, I., Kaya, F., CFD investigation of the flow and heat transfer characteristics in a tangential inlet cyclone, International Communications in Heat and Mass Transfer, 34,(2007), 9-10, pp.1119-1126.
- Jain, A., et al., Studies on Gas-Solid Heat Transfer in Cyclone Heat Exchanger, Journal of Heat Transfer ASME, 128, (2006), 8, pp. 761 - 768.
- Bohnet, M., Influence of the gas temperature on the separation efficiency of aerocyclones, Chemical Engineering and Processing: Process Intensification, 34, (1995), 3, pp.151-156.
- Patterson, P. A., Munz, R. J., Cyclone efficiencies at very high temperatures, Can. J. Chemical Engineering, 67,(1989), 2, pp.321-328.
- Zhu, Y., Lee, K. W., Experimental Study on Small Cyclones Operating at High Flow rates, Journal of Aerosol Science, 30,(1999), 10, pp. 1303-1315.
- Hoekstra, A. J., et al., An experimental and numerical study of turbulent swirling flow in gas cyclones, Chemical Engineering Science, 54,(1999),13-14, pp. 2055-2065.
- Shukla, S. K., et al., Evaluation of Numerical schemes for dispersed phase modelling of cyclone seperators, Engineering applications of Computational Fluid Mechanics, 5, (2011), 2, pp. 235 - 246.
- Xiang, R. B., Lee, K. W., Numerical study of flow field in cyclones of different height, Chemical Engineering and Processing, 44, (2005),8, pp. 877-883.
- Mothilal, T.,Pitchandi, K., Influence of inlet velocity of air and solid particle feed rate on holdup mass and heat transfer characteristics in cyclone heat exchanger, Journal of Mechanical Science and Technology, 29, (2015), 10, pp. 4509 - 4518.
- Mothilal, T.,Pitchandi, K.,, Effect of mass flow rate of inlet gas on holdup mass of solid cyclone heat exchanger, Applied Mechanics and Materials, 592-594, (2014), pp.1498-1502.
- Mothilal, T., et al., Influence of Vortex finder Diameter and Cone tip diameter on Holdup mass and Heat transfer rate in cyclone- CFD Approach, International Journal of Applied Engineering Research, 10, (2015), 33, pp. 25890 - 25897.
- Mothilal, T., et al., The effect of Vortex finder diameter and inlet height on holdup mass and heat transfer characteristics in cyclone heat exchanger-CFD Approach, International Journal of Applied Engineering Research, 10, (2015), 77, pp. 268 -272.
- Cortes, C., Gil, A., Modelling the gas and particle flow inside cyclone separators, Progress in Energy and Combustion Science, 33, (2007), 5, pp. 409-452.
- Ansys Fluent, Fluent 12. Theory guide, Ansys inc.
- Ansys ICEM CFD, ICEM CFD theory guide, Ansys inc.
- Tomic, M. A., et al., Numerical study of perforated plate Convective heat transfer, Thermal Science: 18, (2014), 3, pp. 949-956.