Laminar flow control via utilization of pipe entrance inserts (a comment on entrance length concept)

Çarpınlıoǧlu, Melda Özdinç; Özahi, Emrah

doi:10.1016/j.flowmeasinst.2011.01.005

Cited by 11 publications

(3 citation statements)

References 11 publications

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“…Special flow straighteners are used for this purpose. The efficiency of different types of flow straighteners was investigated in numerous studies [3][4].…”

Section: Introductionmentioning

confidence: 99%

Design of a small-scale wind tunnel for the study of horizontal-axis wind turbine blades

Pankratov

Kangash²,

Kosarev³

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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The paper considers the details of design and construction of a small-sized wind tunnel with an open circuit and a closed test section for investigating the blades of horizontal-axis wind turbines. The effect of different types of jet straighteners on the turbulence of the flow in the test section has been studied. Turbulence flow distributions Tu at Reynolds numbers Re from 5·103 to 2·104 are obtained using Laser Doppler Anemometry methods. As a result, the wind tunnel design with average flow turbulence of 1.6 % is obtained. The flow visualization of NACA 64-618 airfoil at Re = 5·103 is obtained.

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“…Special flow straighteners are used for this purpose. The efficiency of different types of flow straighteners was investigated in numerous studies [3][4].…”

Section: Introductionmentioning

confidence: 99%

Design of a small-scale wind tunnel for the study of horizontal-axis wind turbine blades

Pankratov

Kangash²,

Kosarev³

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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“…The performance of the flowmeter was evaluated by placing a Laws vane flow conditioner between the vortex generator/gate valve and the passivator. Carpinlioglu and Ozahi (2011) introduced the local dimensionless velocity parameter, analyzed the control of flow conditioner on laminar flow, and proposed a formula to estimate the settling distance of flow conditioner and the length of laminar flow inlet. Guo et al (2014) used computational fluid dynamics (CFD) simulation method to analyze the three-dimensional internal flow field of turbine flowmeter.…”

Section: Introductionmentioning

confidence: 99%

Study on the effect of structural parameters of the convergence flow conditioner on eccentric jet flow rectification

Liu

Chen

Tian

et al. 2023

Transactions of the Institute of Measurement and Control

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In flow measurement and control industrial application, installing a flow conditioner is an effective way to rectify irregular and unstable flow to stable flow state within a short flow distance. To effectively rectify the eccentric jet flow caused by valve regulation in pipeline, the convergence flow conditioner with convergent orifice angles has been innovatively designed and investigated. However, the effect of structural parameters (such as flow conditioner thickness and flow area) on improving unstable eccentric jet flow rectification was still not elaborated. Thus, the effect of structural parameters of the convergence flow conditioner on rectifying eccentric jet flow was examined in this paper. The structural parameters of the flow conditioner thickness and the flow area were considered under the fixed convergence angle of 12°. The experimental system of monitoring pressures upstream and downstream of the convergence flow conditioner along the pipeline was developed and corresponding numerical simulation was employed. The flow coefficient and resistance coefficient of a convergence flow conditioner under various valve openings were accessed, and monitored pressures along the pipeline were also discussed for numerical simulation verification. The velocity and streamline distributions downstream the convergence flow conditioners were comparatively analyzed. In addition, the axial velocities on various downstream cross-sections were extracted to evaluate the velocity uniformity. A dimensionless parameter of velocity deviation ratio was introduced to quantify the rectification effect of eccentric jet flow evolving in the downstream pipeline. Results showed that the convergence flow conditioner with the thickness of 6 mm and the flow area of 50% owned a better effect on rectifying the valve-induced eccentric jet flow, that is, a shorter flow length was required for changing the valve-induced eccentric unstable flow to uniform stable flow by installing a convergence flow conditioner with above structural parameters.

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“…As a result, the flow conditioner with the optimum performance was also produced. One more numerical and experimental study comparing flow conditioner performance was done by Carpinoglu and Ozahi [16]. They implemented Etiole, Perforated Plate and Tube Bundle flow conditioners on an air compressor system and investigated the pressure losses and turbulence intensity in different Reynolds numbers.…”

Section: Introductionmentioning

confidence: 99%

An Extensive Investigation of Flow Conditioners Inside a Fi-Fi Monitor

Bilir

Doğrul

Vardar

2022

brod

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As it is known, to provide fire protection for any type of surface vessel, external fire-fighting (EFF) systems have been commonly used for decades as well as in coastal regions. These types of systems exist on several types of vessels such as fire-fighting ships, tugboats, supply vessels and naval vessels. Flow conditioners can be used in the EFF systems to provide better performance by regulating the flow inside the fi-fi monitor. In the present study, a fire-fighting (fi-fi) monitor was designed and different flow conditioners were implemented into the fi-fi monitor. A unique flow conditioner was designed in addition to the recommended ones by ISO 5167-3 in order to improve the performance of the flow conditioner in terms of head ratio and flow rate. A commercial computational fluid dynamics (CFD) solver was used to investigate the performance of the different flow conditioners. Before comparing the numerical results of different flow conditioners, the numerical model was validated with the experimental data and verified with appropriate methods. The results showed that the unique flow conditioner successfully regulates the streamlines and it has better performance than the recommended ones by ISO 5167-3 in terms of flow rate and head ratio. As the last part of the study, the effect of unique flow conditioner length was investigated and the best length was determined.

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Laminar flow control via utilization of pipe entrance inserts (a comment on entrance length concept)

Cited by 11 publications

References 11 publications

Design of a small-scale wind tunnel for the study of horizontal-axis wind turbine blades

Design of a small-scale wind tunnel for the study of horizontal-axis wind turbine blades

Study on the effect of structural parameters of the convergence flow conditioner on eccentric jet flow rectification

An Extensive Investigation of Flow Conditioners Inside a Fi-Fi Monitor

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