[논문]단일 거칠기 요소가 벤투리 캐비테이션에 미치는 영향

황종빈; 신이수; 김주하

doi:10.5407/jksv.2023.21.1.057

단일 거칠기 요소가 벤투리 캐비테이션에 미치는 영향
Effects of a single roughness element on Venturi cavitation 원문보기

한국가시화정보학회지= Journal of the Korean society of visualization, v.21 no.1, 2023년, pp.57 - 66

황종빈 (Department of Mechanical Engineering, Ulsan National Institute of Science and Technology) , 신이수 (Department of Mechanical Engineering, Ulsan National Institute of Science and Technology) , 김주하 (Department of Mechanical Engineering, Ulsan National Institute of Science and Technology)

Abstract ▼ AI-Helper

In this study, we investigate the effects of a single roughness element on Venturi cavitation. The single roughness element of hemispherical shape is installed at the throat inlet of a Venturi tube. Since the wake behind the roughness element induces an additional pressure drop, cavitation inception occurs at a higher Cavitation number for the Venturi model with the single roughness element than for the Venturi model with no roughness. Cavitation bubbles form along the wake of the roughness element and lengthen in the streamwise direction as the Cavitation number decreases, forming a longitudinal cavitation. With a further decrease in the Cavitation number, the longitudinal cavitation bubble merges with the sheet cavitation initiated from the exit edge of the Venturi tube throat, followed by the shedding of cloud cavitation. The merging of the longitudinal cavitation and sheet cavitation is accompanied by a sudden decrease in the discharge coefficient and an increase in the pressure loss coefficient as it chokes the flow inside the Venturi tube.

주제어

표/그림 (11)

그림 Fig. 1. Structure of the cavitation in Venturi
그림 Fig. 2. Schematic diagram of the experimental setup for Venturi cavitation
그림 Fig. 3. Geometry of the Venturi with single roughness element (a) Front view, (b) Top view. The Figures are not to scale.
그림 Fig. 4. Schematic diagram of the experimental setup for the Venturi cavitation visualization
그림 Fig. 5. Variation in the (a) discharge coefficient and (b) pressure loss coefficient with the cavitation.
그림 Fig. 6. Instantaneous image in the front view of the base Venturi model at (a) B1 (σ = 0.982), (b) B2 (σ = 0.958), and (c) B3 (σ = 0.96).
그림 Fig. 7. Instantaneous image in the top view of the base Venturi model at (a) B1 (σ = 0.982), (b) B2 (σ = 0.958), and (c) B3 (σ = 0.96).
그림 Fig. 8. Cavitation development structure of base Venturi model at (a) B1 (σ = 0.982), (b) B2 (σ = 0.958), and (c) B3 (σ = 0.96).
그림 Fig. 9. Instantaneous image in the front view of the single roughness model at (a) R1 (σ = 1.366), (b) R2 (σ = 1.122), and (c) R3 (σ = 1.061).
그림 Fig. 10. Instantaneous image in the top view of the single roughness model at (a) R1 (σ = 1.366), (b) R2 (σ = 1.122), and (c) R3 (σ = 1.061).
그림 Fig. 11. Cavitation development structure of the single roughness model at (a) R1 (σ = 1.366), (b) R2 (σ = 1.122), and (c) R3 (σ = 1.061).

참고문헌 (22)

Ceccio, S. L., 2010, "Friction drag reduction of？external flows with bubble and gas injection,"？Annu. Rev. Fluid Mech., Vol. 42, pp.183~203.

상세보기
Bae, H. W., Lee, S. M., Song, M. S. and Sung,？J. Y., 2019, "Flow visualizations and analysis？on characteristics of bubbly flows exhausted？from a venturi-type bubble generator with an air？vent," Journal of the Korean Society of？Visualization, Vol.17(1), pp.60~68.
Choi, C. H., Choi, S. W. and Song, S. M.,？2017, "Design and Performance Evaluation of？Visualization System for Measuring the Void？Fraction of Two-phase Flow," Journal of the？Korean Society of Visualization, Vol.15(1),？pp.11~18.
Kim, G. R., Choi, S. W., Kim, Y. K. and Kim,？K. C., 2012, "Measurement of Bubble Diameter？and Rising Velocity in a Cylindrical Tank using？an Optical Fiber Probe and a High Speed？Visualization Technique," Journal of the Korean？Society of Visualization, Vol.10(2), pp.14~19.
Kim, S. M., Jeong, W. T. and Kim, K. C.,？2010, "Visualization Study on Kinematics of？Bubble Motion in a Water Filled Cylindrical？Tank," Journal of the Korean Society of？Visualization, Vol.8(3), pp.41~48.
Callenaere, M., Franc, J., Michel M. and？Riondet M., 2001, "The cavitation instability？induced by the development of a re-entrant jet," J. Fluid Mech., Vol. 444, pp.223~256.

상세보기
Stanley, C., Barber, T. and Rosengarten, G.,？2014. "Re-entrant jet mechanism for periodic？cavitation shedding in a cylindrical orifice," Int.？J. Heat Fluid Flow., Vol.50, pp.169~176.
Simpson, A. and Ranade, V. V., 2019, "Modeling？hydrodynamic cavitation in venturi: Influence of？venturi configuration on inception and extent of？cavitation," AIChE. J., Vol.65(1), pp.421~433.

상세보기
Li, M., Bussonniere, A., Bronson, M., Xu, Z.？and Liu, Q., 2019, "Study of Venturi tube？geometry on the hydrodynamic cavitation for？the generation of microbubbles," Miner. Eng.,？Vol.132, pp.268~274.

상세보기
Kawanami, Y., Kato, H., Yamaguchi, H.,？Tanimura, M. and Tagaya, Y., 1997, "Mechanism？and control of cloud cavitation," J. Fluids Eng.,？Vol.119(4), pp.788~794.

상세보기
Coutier-Delgosha, O., Devillers, J. F., Leriche,？M. and Pichon, T., 2005, "Effect of wall roughness？on the dynamics of unsteady cavitation," J.？Fluids Eng., Vol.127(4), pp.726~733.

상세보기
Li, Y., Chen, H., Wang, J. and Chen, D.,？2010, "Effect of grooves on cavitation around？the body of revolution," J. Fluids Eng., Vol.132(1).

상세보기
Arndt, R. E. and Ippen, A. T., 1968, "Rough？surface effects on cavitation inception," J. Basic？Eng., Vol.90(2), pp.249~261.

상세보기
Stutz, B., 2003, "Influence of roughness on the？two-phase flow structure of sheet cavitation," J.？Fluids Eng., Vol.125(4), pp652~659.

상세보기
Danlos, A., Ravelet, F., Coutier-Delgosha, O.？and Bakir, F., 2014, "Cavitation regime detection？through Proper Orthogonal Decomposition:？Dynamics analysis of the sheet cavity on a？grooved convergent-divergent nozzle," Int. J.？Heat Fluid Flow., Vol.47, pp.9~20.
Bashir, T. A., Soni, A. G., Mahulkar, A. V.？and Pandit, A. B., 2011, "The CFD driven？optimisation of a modified venturi for？cavitational activity," Can. J. Chem. Eng.,？Vol.89(6), pp.1366~1375.

상세보기
Zuo, Z., Zhang, H., Ren, Z., Chen, H. and？Liu, S., 2022, "Thermodynamic effects at？Venturi cavitation in different liquids," Phys.？Fluids., Vol.34(8), pp.083310.
Zhang, H., Zuo, Z., Morch, K. A. and Liu, S.,？2019, "Thermodynamic effects on Venturi？cavitation characteristics," Phys. Fluids, Vol.31(9),？pp.097107.

상세보기
Cooper, J. R. and Dooley, R. B., 2007,？"Revised release on the IAPWS industrial？formulation 1997 for the thermodynamic？properties of water and steam," International？Association for Properties of Water and Steam,？Lucerne, Switzerland, 2007.
Rudolf, P., Hudec, M., Griger, M. and Stefan,？D., 2014, "Characterization of the cavitating？flow in converging-diverging nozzle based on？experimental investigations," In. EPJ. Web of？conferences., Vol.67, pp.02101, EDP Sciences.
Bermejo, D., Escaler, X. and Ruiz-Mansilla,？R., 2021, "Experimental investigation of a？cavitating Venturi and its application to flow？metering," Flow Meas. Instrum., Vol.78,？pp.101868.
International Organization for Standardization,？2003, "Measurement of Fluid Flow by Means of？Pressure Differential Devices Inserted in？Circular Cross-section Conduits Running Full:？Mesure de Debit Des Fluides Au Moyen？D'apparils Deprimogenes. Inseres Dans Des？Conduites en Charge de Section Ciculaire.？General Principles and Requirements," International？Organization for Standardization.？

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