Experimental and numerical analysis of a demister with vortex generators

Yang, Laishun; Xu, Minghai; Wang, Jianjun; Song, Lei

doi:10.1016/j.cjche.2020.07.045

Cited by 17 publications

(7 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When calculating the continuous phase, the renormalization group (RNG) k–ε turbulence model was combined with the enhanced wall function to describe the gas motion. The turbulence model and near‐wall model adopted in this study exhibited high accuracy and fast convergence for the numerical prediction results of the wave demisters [24–26, 31]. The following functions are used in the enhanced wall function:

u^{+} = e^{Γ} u_{lam}^{+}

e^{1 / Γ} u_{turb}^{+}

.…”

Section: Model and Numerical Simulation Methodsmentioning

confidence: 99%

“…The physical properties of the gas and liquid investigated are listed in Table 2. The droplet diameter distribution at the entrance of the demister conforms to the Rosin–Rammler distribution law, which means the mass fraction of the droplets with a diameter greater than D is given by

M_{D} goodbreak= e^{- {(D / \overset{true¯}{D})}^{n}},

where the mean diameter

\overset{D}{true}

and the spread parameter n are set to 39.35 μm and 3.5, respectively [31].…”

Section: Model and Numerical Simulation Methodsmentioning

confidence: 99%

“…A detailed description of the experimental spray system can be found elsewhere [31]. To observe the reliability of the proposed numerical model, a physical analog demister model was established based on the experimental sample structure, and the simulation results were compared with the author's previous experimental results [31]. As shown in Figure 4, the numerical simulation and experimental results on demisting efficiency and drag were compared.…”

Section: Model and Numerical Simulation Methodsmentioning

confidence: 99%

“…Hence, increasing the inertial force of the droplet in the mainstream is beneficial to microdroplets in a two‐phase flow of gas–liquid separation. Yang [31–33] first used the numerical simulation method to investigate the effect of VGs of different shapes on the removal of microdroplets and the impact on drag and then verified the above conclusions by obtaining the droplet size distribution through experiments. Finally, the intensity of the secondary flow and the performance of gas–liquid separation were related via the vorticity theory [34–36].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of transverse vortex on performance of wave plate demister

Yang,

Cui,

Wang

et al. 2023

Asia-Pacific J Chem Eng

Self Cite

View full text Add to dashboard Cite

Corrugated plate mist eliminators are commonly employed in industrial processes to eliminate liquid droplets from gas flows. Engineering a mist eliminator with excellent separation performance including high removal efficiency and low pressure drop and is a primary consideration in industrial processes. This study focuses on the separation of tiny droplets reinforced by the generation of transverse vortices with the help of curved wings. The Euler–Lagrange model is developed to predict the behavior of droplets in gas streams, and velocity distributions and particle trajectories on the demisters were derived. And the prediction equations of the curved wing structure sizes on the efficiency and pressure drop of the mist eliminator are established. The results demonstrated that the grade separation efficiency of 10~20 μm droplet was significantly improved by 25.7%~66.51%. Moreover, for the total removal efficiency, it could be improved from .8 to .92 at 5.5 m s−1, and the accompanying resistance factor was as low as 2.7. Among the proposed arrangements, the double‐row single‐column array arrangement was characterized by higher demisting efficiency and lower pressure drop. Overall, compared to other optimization methods, this proposed optimization approach by means of transverse vortices yielded a higher demisting efficiency and less pressure drop.

show abstract

u^{+} = e^{Γ} u_{lam}^{+}

e^{1 / Γ} u_{turb}^{+}

.…”

Section: Model and Numerical Simulation Methodsmentioning

confidence: 99%

M_{D} goodbreak= e^{- {(D / \overset{true¯}{D})}^{n}},

where the mean diameter

\overset{D}{true}

and the spread parameter n are set to 39.35 μm and 3.5, respectively [31].…”

Section: Model and Numerical Simulation Methodsmentioning

confidence: 99%

Section: Model and Numerical Simulation Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of transverse vortex on performance of wave plate demister

Yang,

Cui,

Wang

et al. 2023

Asia-Pacific J Chem Eng

Self Cite

View full text Add to dashboard Cite

show abstract

“…It has the advantages of small space occupation, small flow resistance, and a wide influence range. [28][29][30][31][32][33][34] However, in the previous research on hydrogen fuel cells, the studies on longitudinal vortex generators used to improve cell performance are quite scarce.…”

Section: Introductionmentioning

confidence: 99%

Effect of cathode operation parameters on the performance of proton exchange membrane fuel cell with curved wing vortex generator by response surface method

Yang

Shi

Cui

et al. 2022

Energy Science & Engineering

Self Cite

View full text Add to dashboard Cite

With the increasing popularity of fuel cells, improving their power density and the fuel cell system efficiency has become very topical. This study used the curved wing vortex generator to generate a secondary flow in the cathode flow channel to improve the performance of the proton exchange membrane fuel cell (PEMFC). The curved wing's structure and arrangement effects on the performance of fuel cells were numerically simulated. Next, to summarize the combined effects of cathode operating conditions on the performance of PEMFC, this study used the response surface method to assess the influence of operating conditions variables on the performance target of PEMFC with curved wings. The combined effects of cathode operating conditions, namely temperature, pressure, reactant stoichiometry, and relative humidity, on the system efficiency and power density of the fuel cell system were investigated.The predictive correlations between these variables were also fitted. The installation of curved wings promoted the diffusion of reactants, as well as improved the uniformity of temperature distribution and the discharge of liquid water in the fuel cell, enhancing its overall performance. Among the four operating parameters under study, the most significant effect on the fuel cell power density was provided by the temperature, followed by pressure, humidity, and reactant stoichiometry. The fuel cell efficiency was the most significantly improved by increasing the relative humidity, while temperature increase had the second-best impact, followed by pressure, and reactant stoichiometry.

show abstract

Research on enhancing separation of ultra‐fine droplets using turbulators between adjacent demister plates in WFGD systems

Jia,

Yang,

Bai

et al. 2024

Can J Chem Eng

View full text Add to dashboard Cite

To enhance the performance of demister applied in wet flue gas desulphurization systems, flow turbulators are equipped between adjacent plates to reconstruct flow field. Both experimental and numerical approaches are employed to investigate the influence of various kinds of turbulator configurations upon removal of droplets within the range of 5–50 μm obeying Rosin‐Rammler distribution. Turbulators including spoiler, square column, concave groove, perforated concave groove, and triangular and cylinder columns are compared, among which spoiler provided the highest overall efficiency while square column yields the best graded efficiency for 5 μm droplets group. Furthermore, moving the spoiler towards the core region of the demister ducts received better performance due to augmented interaction between spoiler and drainage channels, which performed an essential role in droplets collection. Based on this knowledge, spoilers are optimized by changing their angle of attack and size; the result is positive since overall separation efficiency can be improved to 100%, along with graded efficiencies for 10 and 5 μm groups achieving 95.97% and 27.26%, respectively, much higher than those of baseline demister without turbulators. This study indicates that inertial‐based demisters have great potential in separating ultra‐fine droplets through reorganizing turbulence field, thus extra system loss can be avoided by abandoning additional filter components.

show abstract

Experimental and numerical analysis of a demister with vortex generators

Cited by 17 publications

References 28 publications

Effect of transverse vortex on performance of wave plate demister

Effect of transverse vortex on performance of wave plate demister

Effect of cathode operation parameters on the performance of proton exchange membrane fuel cell with curved wing vortex generator by response surface method

Research on enhancing separation of ultra‐fine droplets using turbulators between adjacent demister plates in WFGD systems

Contact Info

Product

Resources

About