## THERMAL SCIENCE

International Scientific Journal

### Thermal Science - Online First

online first only
### CFD 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 holdup mass and heat transfer rate in cyclone heat exchanger by using computational fluid dynamics (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. RNG k-ε turbulence model was adopted in ANSYS Fluent 12.0 software to analyze the flow field and discrete phase model (DPM) 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 holdup mass and heat transfer rate whereas increase in density of particles decreases the holdup mass and heat transfer rate. Experimental setup was built for stairmand high efficiency cyclone and good agreement was found between simulation and experimental result. New correlation was proposed for non-dimensional holdup mass. Correlation compared with experimental holdup 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

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