Studies on Separation Efficiency and Energy Conservation Through Novel Finned Cyclone Separator

2020 ◽  
Vol 142 (4) ◽  
Author(s):  
Mahesh Dasar ◽  
Ranjit S. Patil
Keyword(s):  
Heat Exchanger ◽  
Energy Conservation ◽  
Cross Section ◽  
Separation Efficiency ◽  
Collection Efficiency ◽  
Rectangular Cross Section ◽  
Fluid Dynamic ◽  
Scale Up ◽  
Tangential Velocity ◽  
Cyclone Separator

Abstract In the present study, cylindrical portion of conventional (nonfinned) cyclone separator was reshaped by fixing triangular, semicircular, and rectangular cross section helical fins in order to make it as water wall having fin size 7 mm with fin pitch of 40 mm to improve its separation efficiency and to utilize the cyclone separator as heat exchanger. Fluid dynamic characteristics like axial velocity, tangential velocity, pressure drops were studied by varying the fin geometry (triangular/semicircular/rectangular). For the particles' size less than 3 μm, proposed cyclone separator with triangular helical fin was giving comparatively improved collection efficiency than other selected cyclone separators. Improvement in the collection efficiency of triangular fin-based cyclone separators was perceived from 5% to 10% over the conventional cyclone separator. Hence, helical fins with triangular in cross section were selected further for heat transfer and scale-up studies. It was observed that for the small barrel wall height (h = 400 mm) water temperature was enhanced by 4 °C, and with scale-up (making h = 800 mm) it was increased considerably around 15 °C. Thus based on improved separation efficiency to capture very-fine particulate matter (PM 2.5, which otherwise causes serious health issues) and considerable temperature gain of water noted at lab level scale-up study, triangular helical fins may be to fixed on the inner surface of barrel wall of conventional (nonfinned) cyclone separators in order to use them as heat exchanger for energy conservation in industrial applications.

New cyclone separator-based prefilter design for internal combustion engine applications. Part 1: Experiments and simulation

2006 ◽  
Vol 220 (9) ◽  
pp. 1353-1362
Author(s):  
K Madhusudhan ◽  
M V Narasimhan ◽  
R V Ravikrishna
Keyword(s):  
Pressure Loss ◽  
Combustion Engine ◽  
Collection Efficiency ◽  
Fluid Dynamic ◽  
Cyclone Separator ◽  
Two Phase ◽  
Dynamic Simulations ◽  
Dust Collection ◽  
Conventional Design ◽  
Dust Collection Efficiency

A new design of a cyclone separator-based prefilter is proposed for applications in air filtration for tractor engines and other earth-moving equipment. This design differs from the conventional prefilter in having a unidirectional flow. As a consequence, the new design offers much lower pressure loss when compared with the conventional design. A model of the new design is fabricated, and experiments were conducted to evaluate pressure loss and dust collection efficiency. Results show that the new cyclone separator is better in terms of pressure drop and dust collection efficiency when compared with the conventional design Computational fluid dynamic simulations of the two-phase flow were performed using FLUENT, and the predictions are validated with the experimental data.

Effects of helical fins with semi-circular in cross-section on the performance characteristics of novel finned-cyclone separators

2020 ◽  
Vol 234 (17) ◽  
pp. 3509-3520
Author(s):  
Mahesh Dasar ◽  
Ranjit S Patil
Keyword(s):  
Cross Section ◽  
Fine Particles ◽  
Collection Efficiency ◽  
Circular Cross Section ◽  
Main Role ◽  
Cyclone Separator ◽  
Process Industries ◽  
Computational Fluid Dynamics Simulations ◽  
Improved Performance ◽  
Dynamics Simulations

Separation of particles (solid) from hot gases were carried out with the help of cyclone separators in most of the power generation industries (fluidized bed boilers) and process industries. Present research focuses on improving the performances of such devices by modifying the geometry. Conventional 2D2D Lapple type cyclone separator geometry was modified by attaching semi-circular cross-section helical fins along the height of barrel wall to make it as finned-cyclone separators. Semi-circular helical fins attached on the barrel wall varies (six-sets) with size (5 mm, 7.5 mm, and 10 mm) and pitch (30 mm and 50 mm). 3D computational fluid dynamics simulations were carried out using ANSYS 15.0 tool and validation were performed with experimental data available in the literature for conventional 2D2D Lapple type cyclone separator before proceeding towards simulations of semi-circular finned-cyclone separators. Improved performance was noticed from all selected six cyclone separators with semi-circular fins (cswf) when compared to conventional cyclone separators while studying the fluid mechanics characteristics, which directly influences on collection-efficiency of cyclone separators. Among selected cyclone separators, the cswf with size of fin 7.5 mm and fin-pitch 50 mm was noted to be performing improved collection efficiency for the particles size <3 µm. Around 5%–11% improved collection efficiency when compared to conventional cyclone separators were observed in the study by fixing the semi-circular fins along the height of barrel wall without disturbing the main role of cyclone separator, which is separating the very fine particles, which would otherwise causes pollution.

Fog harvesting from cooling towers using metal mesh: Effects of aerodynamic, deposition, and drainage efficiencies

2019 ◽  
Vol 234 (7) ◽  
pp. 994-1014 ◽  
Author(s):  
Ritwick Ghosh ◽  
Ranjan Ganguly
Keyword(s):  
Fresh Water ◽  
Cooling Tower ◽  
Collection Efficiency ◽  
Fluid Dynamic ◽  
Tangential Velocity ◽  
Cooling Towers ◽  
Metal Mesh ◽  
Computational Fluid Dynamic Analysis ◽  
Fog Collection ◽  
Energy Penalty

Fog harvesting is recognized as an important alternate source of fresh water. Industrial fog can supplement water for industrial requirement. Collection of fog (drift droplets) from cooling tower plumes is a viable mode of industrial fog harvesting. The present study delves deeper into the findings of our earlier pilot investigation, on cooling tower fog harvesting and unravels how the collection efficiency depends on interaction of the mesh with the oncoming flow and the deposited fog droplets. Herein, we quantify the fog collection and explain the rationale of the individual contributions of aerodynamic, deposition, and drainage efficiencies on the overall collection efficiency. The effect of the mesh orientations and the tangential velocity component of the cooling tower plume (arising out of the cooling tower-fan rotation) are considered. Aerodynamic efficiency of the mesh and pressure drop across is estimated through computational fluid dynamic analysis. Also, an analysis of the force interaction between the mesh wires, deposited droplet, and the fog stream is carried out to identify the salient deterring factors like re-entrainment, clogging, and premature dripping of collected water droplets, based on which the regime of collection is mapped. The best collection configuration is found at an inclination of 15° with the vertical, with an overall collection efficiency of about 16%. The best configuration would allow recovery of re-usable fresh water at a nominal energy penalty of ∼3.9 kWh/m3. Our results offer the design bases for developing full-scale fog harvesting setups for industrial cooling towers.

Analyses on Effect of Helix Angle on the Continuous Helical Baffles Heat Exchanger

2014 ◽  
Vol 1008-1009 ◽  
pp. 901-905
Author(s):  
Jia Zhu Zou ◽  
Feng Wei Yuan ◽  
Liang Bin Hu
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Heat Exchanger ◽  
Cross Section ◽  
Outer Region ◽  
Tangential Velocity ◽  
Helix Angle ◽  
Heat Transfer Characteristics ◽  
Shell Side ◽  
Inner Region

A numerical simulation for heat exchanger with continuous helical baffles was carried out. The study focuses on the effects of helix angle on heat transfer characteristics. The results show that both the shell-side heat transfer coefficient and pressure drop decrease with the increase of the helix angle at certain mass flow rate. The latter decreases more quickly than the former. The tangential velocity distribution on shell-side cross section is more uniform with continuous helical baffles than with segmental baffles. The axial velocity at certain radial position decreases as the helix angle increases in the inner region near the central dummy tube, whereas it increases as the helix angle increases in the outer region near the shell. The heat exchange quantity distribution in tubes at different radial positions is more uniform at larger helix angel.

Numerical simulation of the particle-wall collision strength and swirling effect on the performance of the axial flow cyclone separator

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Yanqin Mao ◽  
Wenhao Pu ◽  
Liang Cai ◽  
Chaojie Li ◽  
Xiaoyue Wang ◽  
...  
Keyword(s):  
Separation Efficiency ◽  
Tangential Velocity ◽  
Small Diameter ◽  
Axial Flow ◽  
Separation Performance ◽  
Exhaust Pipe ◽  
Normal Velocity ◽  
Cyclone Separator ◽  
Inlet Velocity ◽  
Wall Collision

Abstract The axial cyclone separator has simple structure, operates to reducing dust concentration in grain storehouses, and features low production cost, and convenient installation. Aiming to obtain the separation characteristics of an axial flow guide separator, the particle wall collision and the performance of multi-tubes were simulated with Fluent. The renormalization group (RNG) k − ε model was used to study the turbulent modeling and the user define function (UDF) was used to calculate the particle-wall collision. The simulation and experimental results were compared to verify the computation model. The results showed that the basic feature of the flow pattern remains stable and the separation efficiency of 800 kg/m3 particles is higher than 2650 kg/m3 particles when the inlet velocity increases from 2 to 5 m/s. When the inlet velocity was 5 m/s, the normal velocity restitution ratio had a significant effect on the efficiency, the separation efficiency of 167 μm particles changed from 76.74 to 97.93% and a smaller normal velocity restitution ratio had a higher the efficiency. In comparison, the efficiency remained unchanged when changing the tangential velocity restitution ratio. Furthermore, the effects of three target wall materials on the separation efficiency were investigated. And the simulated efficiency the of 296 μm particle of 2024 aluminum, 410 stainless steel and Ga1–4V titanium were 82.15, 79.52 and 77.53% respectively. Besides, effects of tube diameter on performances of cyclone separator were discussed and high intense collisions between particles and walls may occur in a small diameter of cyclone tube, causing deteriorated separation performance. Moreover, with the addition of the dust chamber, the efficiency of cyclone used in combination is slightly improved since the vortex in the exhaust pipe has been finely changed.

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