Experimental investigation of the isothermal flow field across slant 5-tube bundles in helically coiled steam generator geometry using PIV

Lee, S.; Delgado, Marilyn; Hassan, Yassin A.

doi:10.1016/j.nucengdes.2018.08.012

Cited by 14 publications

(5 citation statements)

References 9 publications

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“…The variable position of each tube in the bundle depending on its distance leads to the interferences in the visibility of the measurements (by obscuring the region of interest). This problem was already reported in previous works [22,25]. One of the solutions used in such conditions is to adjust an index of refraction of the fluid to the material from which the tubes are made.…”

Section: Assumptions and Conditions Applied In The Researchmentioning

confidence: 78%

“…The analysis of fluid flow in the shell side was also investigated by Lee at al. [22] and Delgado at al. [23].…”

Section: Insights From the Literature In The Field Of Piv Application In Heat Exchangersmentioning

confidence: 93%

“…One of the solutions used in such conditions is to adjust an index of refraction of the fluid to the material from which the tubes are made. The results of the application of such approaches are presented in references [14,22]. In the current research, another solution was proposed, which involved the removal of the fraction of the tube bundle that obstructs the region of interest.…”

Section: Assumptions and Conditions Applied In The Researchmentioning

confidence: 99%

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CFD and PIV Investigation of a Liquid Flow Maldistribution across a Tube Bundle in the Shell-and-Tube Heat Exchanger with Segmental Baffles

et al. 2020

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The paper presents the results of research on liquid flow maldistribution in the shell side of a shell-and-tube heat exchanger (STHE). This phenomenon constitutes the reason for the formation of the velocity reduction area and adversely affects heat transfer and pressure drop. In order to provide details of the liquid distribution in STHE, two visualization methods were utilized. First, computational fluid dynamics (CFD) code coupled with the k-ε model and the laser-based particle image velocimetry (PIV) technique was applied. The tests were carried out for a bundle comprising 37 tubes in an in-line layout with a pitch dz/t = 1.5, placed in a shell with Din = 0.1 m. The STHE liquid feed rates corresponded to Reynolds numbers Rein equal to 16,662, 24,993, and 33,324. The analysis demonstrated that the flow maldistribution in the investigated geometry originates the result of three main streams in the cross-section of the shell side: central stream, oblique stream, and bypass stream. For central and oblique streams, the largest velocity reduction areas were formed in the wake of the tubes. On the basis of the flow visualization, it was also shown that the in-line layout of the tube bundle helps to boost the wake region between successive tubes in a row. Additionally, unfavorable vortex phenomena between the last row of tubes and the lower part of the exchanger shell were identified in the investigations. The conducted studies confirmed the feasibility of both methods in the identification and assessment of fluid flow irregularities in STHE. The maximum error of the CFD method in comparison to the experimental methods did not exceed 7% in terms of the pressure drops and 11% in the range of the maximum velocities.

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Section: Assumptions and Conditions Applied In The Researchmentioning

confidence: 78%

“…The analysis of fluid flow in the shell side was also investigated by Lee at al. [22] and Delgado at al. [23].…”

Section: Insights From the Literature In The Field Of Piv Application In Heat Exchangersmentioning

confidence: 93%

Section: Assumptions and Conditions Applied In The Researchmentioning

confidence: 99%

See 1 more Smart Citation

CFD and PIV Investigation of a Liquid Flow Maldistribution across a Tube Bundle in the Shell-and-Tube Heat Exchanger with Segmental Baffles

et al. 2020

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“…The primary side inlet temperature has a significant influence on the twophase zone length of the secondary side. Lee et al (2018) measured the flow among adjacent rods with particle image velocimetry (PIV) method and found that the asymmetric flow structure behind the rods seems to be a unique feature of helically coiled tube bundles, which is different from that in straight tube bundles.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on flow characteristics in the primary side of a once-through steam generator under ocean conditions

Chen,

Lu,

Gao

et al. 2024

Front. Energy Res.

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The flow characteristics of the primary side of the helical coil once-through steam generator (OTSG) have a significant impact on the safe operation of the reactor. Different from the land-based stationary working conditions, the flow of the primary side of the OTSG is influenced by sea waves and winds under ocean conditions. The rigid body motion model is used to calculate the flow of the primary side under different ocean conditions, including heeling, trimming, rolling, pitching, heaving, and combined conditions. The results show that under heeling and trimming conditions, the static pressure of the primary side is different from that under vertical conditions due to the influence of gravity, but its impact on the flow field is relatively small. Under rolling and pitching conditions, the mean flow velocity and pressure drop change periodically with the movement of the OTSG, and the smaller the sway angle, the smaller the variation amplitude of the mean flow velocity and pressure drop. Under the heaving condition, the variation amplitude of the mean flow velocity is greater than that under rolling and pitching conditions, and reverse flow occurs. Under the combined heaving and rolling condition, the mean flow velocity and pressure drop are influenced by the period and amplitude of both the two motions.

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“…Moreover, based on a vorticity spectral analysis with a bandwidth of 0 to 10 Hz, the authors did not find dominant frequencies for the vortex oscillation. Delgado et al [11,12] and Lee et al [13] conducted several experimental analyses of the external crossflow in a helical coil steam generator (HCSG) using PIV. They identified asymmetric characteristics of the flow structure caused by the geometry of the helical tubes.…”

Section: Introductionmentioning

confidence: 99%

Pressure and shear stress analysis in a normal triangular tube bundle based on experimental flow velocity field

Rocha

Kanizawa

Hayashi

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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This paper presents the experimental vector velocity field obtained through the spatial filter velocimetry technique in a normal triangular tube bundle test section with tubes of 20 mm O.D. and transverse pitch of 25.2 mm. The experiments were conducted for water flows and Reynolds numbers ranging from 447 to 1842. The pressure field was estimated based on the velocity results by solving the Poisson equation. The shear stress around the tubes was analyzed calculating the viscous and Reynolds stresses. The results for turbulence strength and flow vorticity were calculated and discussed. All the analyses were performed using a second-order finite difference scheme to estimate the partial derivatives. The results indicate that the spatial filter velocimetry technique provides accurate velocity data and is suitable to be applied to complex geometries. In addition, the obtained velocity fields show that the SFV technique is capable of capturing asymmetric flow distributions, which switch from time to time, indicating a suitable spatial and temporal resolution for the experimental conditions evaluated in the present study.

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Experimental investigation of the isothermal flow field across slant 5-tube bundles in helically coiled steam generator geometry using PIV

Cited by 14 publications

References 9 publications

CFD and PIV Investigation of a Liquid Flow Maldistribution across a Tube Bundle in the Shell-and-Tube Heat Exchanger with Segmental Baffles

CFD and PIV Investigation of a Liquid Flow Maldistribution across a Tube Bundle in the Shell-and-Tube Heat Exchanger with Segmental Baffles

Numerical study on flow characteristics in the primary side of a once-through steam generator under ocean conditions

Pressure and shear stress analysis in a normal triangular tube bundle based on experimental flow velocity field

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