The improvement of flow conditions in a whirlpool with a modified bottom: An experimental study based on particle image velocimetry (PIV)

Sterczyńska, Monika; Stachnik, Marta; Poreda, Aleksander; Piepiórka-Stepuk, Joanna; Zdaniewicz, Marek; Jakubowski, Marek

doi:10.1016/j.jfoodeng.2020.110164

Cited by 8 publications

(9 citation statements)

References 13 publications

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“…It is generally known that rotating fluid flow in a cyclone separator or cylindrical tank is unsteady and highly stochastic [25,26]. Therefore, there are various limitations for particle imaging, including shutter speed, pixel resolution, and processing algorithms.…”

Section: Methodsmentioning

confidence: 99%

Visualization and Measurement of Swirling Flow of Dry Ice Particles in Cyclone Separator-Sublimator

Yamasaki

WAKIMOTO

Kamimura³

et al. 2022

Energies

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The dry ice sublimation process of carbon dioxide (CO2) is a unique, environmentally friendly technology that can achieve a temperature of −56 °C or lower, which is a triple point of CO2 in CO2 refrigeration systems. In this study, a cyclone separator-evaporator was proposed to separate dry ice particles in an evaporator. As an initial step before introducing the cyclone separator-evaporator into an actual refrigeration system, a prototype cyclone separator-evaporator was constructed to visualize dry ice particles in a separation chamber. A high-speed camera was used to visualize the non-uniform flow of dry ice particles that repeatedly coalescence and collision in a swirl section. Consequently, the dry ice particle size and the circumferential and axial velocities of dry ice were measured. The results show that the equivalent diameter of the most abundant dry ice particles in the cyclone separation chamber is 2.0 mm. As the inner diameter of the separation section decreases, dry ice particles coalesce and grow from an equivalent diameter of 4 mm to a maximum of 40 mm. In addition, the comparison of the experimental and simulation results shows that the drag force due to CO2 gas flow is dominant in the circumferential velocity of dry ice particles.

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Section: Methodsmentioning

confidence: 99%

Visualization and Measurement of Swirling Flow of Dry Ice Particles in Cyclone Separator-Sublimator

Yamasaki

WAKIMOTO

Kamimura³

et al. 2022

Energies

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“…Under two filling rates and three baffle positions, Sterczyńska and Jakubowski [59] applied the PIV technique to monitor the cone-accumulating flow for a whirlpool tank in rotational motion. Based on previous work, the improvement of flow conditions in a whirlpool with a modified bottom is further proposed by Sterczyńska et al [60] using PIV measurements. In the research mentioned above, PIV is utilized to study the complicated flow structures by rigid structures with a range of hydraulic properties.…”

Section: Particle Image Velocimetry (Piv) Measurementsmentioning

confidence: 99%

Experimental Study on Backflow Patterns Induced by a Bilateral Groin Pair with Different Spacing

Kuang

Zheng

et al. 2021

Applied Sciences

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Groins are one of the popular manmade structures to modify the hydraulic flow and sediment response in river training. The spacing between groins is a critical consideration to balance the channel-depth and the cost of construction, which is generally determined by the backflow formed downstream from groins. A series of experiments were conducted using Particle Image Velocimetry (PIV) to observe the influence of groin spacing on the backflow pattern of two bilateral groins. The spacing between groins has significant effect on the behavior of the large-scale recirculation cell behind groins. The magnitude of the wake flow induced by a groin was similar to that induced by another groin on the other side, but the flow direction is opposite. The spanwise velocity near the groin tip dictates the recirculation zone width behind the groins due to the strong links between the spanwise velocity and the contraction ratio of channel cross-sections between groins. Based on previous studies and present experimental results, quantitative empirical relationships are proposed to calculate the recirculation zone length behind groins alternately placed at different spacing along riverbanks. This study provides better understanding and a robust formula to assess the backflow extent of alternate groins and identify the optimum groins array configuration.

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“…Besides, as the main raw test data of the PIV system is the particle position, when the PIV system is applied to the mixture fluid with a high concentration of the dispersed phase, the test performance has substantial limitations. More details about establishing the PIV visualization technology can be found in the works of Jakubowski et al [23,24]. The boundary of the contraction section, which is located between the rectification section and the test section, is a smooth curve.…”

Section: Structure and Working Principlementioning

confidence: 99%

Enhancing Flow Field Performance of a Small Circulating Water Channel Based on Porous Grid Plate

2020

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Low-cost and high-efficiency circulating water channels are widely used in the hydrodynamic tests of an underwater device. The current research mainly focuses on obtaining a better velocity uniformity of the test section by optimizing the curve function of the boundary in the contraction section. While, for small underwater device, their hydrodynamic characteristics are sensitive to turbulence. Thus, the circulating water channel, which can obtain the required turbulence characteristics, is urgently needed. A small circulating water channel, which can reduce the turbulence intensity based on a porous grid plate and can be used to test the hydrodynamic characteristics of a small underwater device, is designed. The relationships between porosities and resistance coefficients of a porous grid plate are established. The effects of the honeycomb (porosity and thickness); screen (porosity, number of layers, and spacing); and pumping flow rate on the turbulent characteristics of the test section are studied. The relationships between the parameters and the turbulent characteristics of the test section are established, and the methods to achieve the required flow characteristics of the test section are proposed. Experiments are carried out, and the validity of the obtained results is verified. In this work, the turbulence intensity of the fluid field in the test section can be restrained to 0.0491, which is enough to meet the turbulence requirements for the hydrodynamic test of a small underwater device. This work can provide references for the construction of a hydrodynamic test platform for small underwater devices.

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The improvement of flow conditions in a whirlpool with a modified bottom: An experimental study based on particle image velocimetry (PIV)

Cited by 8 publications

References 13 publications

Visualization and Measurement of Swirling Flow of Dry Ice Particles in Cyclone Separator-Sublimator

Visualization and Measurement of Swirling Flow of Dry Ice Particles in Cyclone Separator-Sublimator

Experimental Study on Backflow Patterns Induced by a Bilateral Groin Pair with Different Spacing

Enhancing Flow Field Performance of a Small Circulating Water Channel Based on Porous Grid Plate

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