Experimental investigation of turbulent transport of momentum and energy in a heated rod bundle

Krauss, Todd; Meyer, L.

doi:10.1016/s0029-5493(98)00158-7

Cited by 98 publications

(32 citation statements)

References 21 publications

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“…The validity of the methodology used in this study is based on the experimental data of Krauss and Meyer [9].With the Reynolds number ranging from 5000 to 215000 and P/D In very tight lattice (P/D < 1.1), the effect of P/D on the wall shear stress and turbulent kinetic energy is significant due to the dramatic variation of the amplitude and the frequency of the flow oscillation in the gap region.…”

Section: Discussionmentioning

confidence: 99%

“…Numerical results were validated by the experiment of Krauss and Meyer [9]. Detailed information of experimental and numerical setup is listed in Table 1.…”

Section: Numerical Proceduresmentioning

confidence: 99%

“…With the development of measurement techniques, more experiments were presented in the late 1990 [4][5][6][7][8][9], which indicate that the turbulent flow in a rod bundle has completely different characteristics compared to that in a pipe. A high mixing in the gap region was observed, which was once explained by the secondary flow.…”

Section: Introductionmentioning

confidence: 99%

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URANS simulation of the turbulent flow in tight lattice bundle

Yang

2011

Front. Energy

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The flow structure in tight lattice is still of great interest to nuclear industry. An accurate prediction of flow parameter in subchannels of tight lattice is likable. Unsteady Reynolds averaged Navier Stokes (URANS) is a promising approach to achieve this goal. The implementation of URANS approach will be validated by comparing computational results with the experimental data of Krauss. In this paper, the turbulent flow with different Reynolds number (5000-215000) and different pitch-to-diameter(P/D) (1.005-1.2) are simulated with computational fluid dynamics (CFD) code CFX12. The effects of the Reynolds number and the bundle geometry (P/D) on wall shear stress, turbulent kinetic energy, turbulent mixing and large scale coherent structure in tight lattice are analyzed in details. It is hoped that the present work will contribute to the understanding of these important flow phenomena and facilitate the prediction and design of rod bundles.

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Section: Discussionmentioning

confidence: 99%

“…Numerical results were validated by the experiment of Krauss and Meyer [9]. Detailed information of experimental and numerical setup is listed in Table 1.…”

Section: Numerical Proceduresmentioning

confidence: 99%

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URANS simulation of the turbulent flow in tight lattice bundle

Yang

2011

Front. Energy

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“…They found that creep ruptures can be caused by softened structures. Furthermore, Krauss et al [17] investigated the momentum and energy transport in a heated rod bundle. They found that a lower gradient-to-diameter ratio increased the heat transfer efficiency.…”

Section: Introductionmentioning

confidence: 99%

Thermal Characteristics of Tube Bundles in Ultra-Supercritical Boilers

et al. 2016

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Abstract:In this study, flow and thermal characteristics of tube bundles in ultra-supercritical boilers were analyzed. The local heat transfer around the tube bundles was measured to predict the local temperature distribution and vulnerable positions of the superheated tube bundles. The maximally superheated tube bundles were simulated in the laboratory and local heat transfer was measured by using the naphthalene sublimation method. The experiment was conducted on three lines of tube bundles, all with in-line arrangements. Each line consist of six tubes. The distance in the streamwise direction (S x /∅) was 1.99 and that in the spanwise direction (S z /∅) was 5.45. The Reynolds number varied from 5000 to 30,000, which covers a range of different operating conditions. Thermal and stress analyses were conducted numerically, based on the experimental data. The results showed that the flow characteristic changes the local heat transfer of the tube bundles. The flow impinged on the stagnation point of Tube 1 and reattached at 60 • of Tube 2. The high heat transfer occurred at those positions of the tube bundles. The temperature and stress distributions on the surface of each tube bundle also varied. The reattachment point on Tube 2 had the highest heat transfer and temperature distribution. That position on Tube 2 was subjected to the highest stress due to the large temperature gradient. This result indicates that Tube 2 of the ultra-supercritical (USC) boiler is the weakest of the tube bundles, changing the pitch of the streamwise direction of Tube 2 is one method to reduce the highest stress in superheater tube bundles in the USC boiler.

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“…However, the quasi-periodic large scale vortex structure (QPLSVS) is used more extensively in recent years (Yan and Yu, 2011;Lee et al, 2013). Krauss and Meyer (1998) proposed the pattern of QPLSVS into two vortex streets that rotate in opposite directions. The axes of these two vortices are in the opposite sides of the gap.…”

Section: Introductionmentioning

confidence: 99%