Flow Conditioning Design in Thick Liquid Protection

Durbin, Samuel; Yoda, Minami; Abdel‐Khalik, S. I.

doi:10.13182/fst05-a771

Cited by 3 publications

(2 citation statements)

References 8 publications

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“…In all cases, measurements are reported only for the near-field region x≤25δ. Further details of the experimental apparatus and all experimental procedures described here can be found in Durbin [5] and Durbin et al [6,7]. A recirculating flow loop driven by a 5.6 kW (7.5 hp) centrifugal pump was used to produce the rectangular jets.…”

Section: Experimental Descriptionmentioning

confidence: 99%

Initial Conditions and Near-Field Dynamics in Turbulent Liquid Sheets

Durbin

Yoda

Abdel‐Khalik

2007

Flow Turbulence Combust

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High-speed liquid "curtains" have been proposed to protect solid structures in fusion energy applications. Minimizing free-surface waves and spray formation in such flows is important for effective protection in this application. In this work, free-surface waves and turbulent breakup were studied experimentally in jets of water issuing from a rectangular nozzle into ambient air at a Reynolds number of 1.2×10 5 . Laser-Doppler anemometry was used to characterize the streamwise and transverse velocity components in the nozzle for two different flow calming section designs. Planar laser-induced fluorescence was used to measure the free-stream position in the near-field of the sheet. The results suggest that transverse velocity fluctuations in the nozzle are the primary factor in determining the amplitudes of free-surface waves. Removing a small amount of low-speed fluid immediately downstream of the nozzle exit ("boundary-layer cutting") is shown to both significantly reduce free-surface waves and the amount of spray due to turbulent breakup. Overall, boundary-layer cutting appears to have the greatest benefit when used on a "well-conditioned" turbulent liquid sheet.

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Section: Experimental Descriptionmentioning

confidence: 99%

Initial Conditions and Near-Field Dynamics in Turbulent Liquid Sheets

Durbin

Yoda

Abdel‐Khalik

2007

Flow Turbulence Combust

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“…We are currently using laser-Doppler velocimetry (LDV) to measure profiles of the mean streamwise velocity and rms velocity fluctuations for the x and z velocity components just upstream of the nozzle exit in turbulent liquid sheets. 17,18 The results of these studies will correlate how these initial conditions, reflecting both nozzle and flow conditioning designs, affect surface ripple and the hydrodynamic source term.…”

Section: Thick Liquid Protection Studiesmentioning

confidence: 99%

An Overview of Georgia Tech Studies on the Fluid Dynamics Aspects of Liquid Protection Schemes for Fusion Reactors

Abdel‐Khalik

Yoda

2005

Fusion Science and Technology

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This paper provides an overview of experimental and numerical studies conducted at Georgia Tech to assess the fluid dynamics aspects of liquid protection schemes for fusion energy reactors. The problems described here include: (1) Dynamics of slab jets for thick liquid protection, including the effect of nozzle design, flow conditioning, and boundary layer cutting on jet surface smoothness; (2) Primary turbulent breakup of turbulent liquid s heets and forced thin liquid films, and quantification of the associated hydrodynamic source term; (3) Dynamics of forced films on downward-facing flat and curved surfaces, including film detachment and flow around beam ports; (4) Free-surface topology and drop detachment from downward-facing porous wetted walls; and (5) Thermocapillary effects and associated design constraints for liquid-film-protected divertors and first walls. The experimental data and validated numerical models developed in these studies allow reactor designers to identify design windows for successful operation of liquid-protected first walls and plasma facing components in inertial and magnetic confinement systems.

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Towards a high-intensity muon source

Cai,

He,

Liu

et al. 2024

Phys. Rev. Accel. Beams

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A high-intensity muon source driven by a continuous-wave superconducting linac holds the potential to significantly advance the intensity frontier of muon sources. Alongside advancements in accelerator technologies, breakthroughs in muon production target and collection schemes are essential. After a brief introduction to the development of the accelerator-driven system superconducting linac, a novel muon production target is proposed, utilizing a free-surface liquid lithium jet capable of handling the heat power generated by a proton beam with an energy of 600 MeV and a current of 5 mA. It is predicted by our simulation studies that the lithium target is more efficient in surface muon production compared to the rotating graphite target. The parameter space of the front end consisting of a lithium target and a large-aperture capture solenoid is explored, from the perspective of production efficiency, capture efficiency, and characteristics of the surface muon beam. Published by the American Physical Society 2024

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Flow Conditioning Design in Thick Liquid Protection

Cited by 3 publications

References 8 publications

Initial Conditions and Near-Field Dynamics in Turbulent Liquid Sheets

Initial Conditions and Near-Field Dynamics in Turbulent Liquid Sheets

An Overview of Georgia Tech Studies on the Fluid Dynamics Aspects of Liquid Protection Schemes for Fusion Reactors

Towards a high-intensity muon source

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