Local Heat Transfer in a Rotating Serpentine Flow Passage

Yang, Wen‐Jei; Zhang, Nengli; Chiou, Jeffrey T.

doi:10.1115/1.2911283

Cited by 44 publications

(12 citation statements)

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“…Results indicated that the 180-deg turn had positive effect on heat transfer in the turn and downstream. Yang et al (1992) [5] and Mochizuki et al (1994) [6] studied heat transfer in rotating multi-pass smooth square channels vie copper plate heating technique. They concluded that the flow exhibited strong three dimensional structure in the 180-deg bends and a significant enhancement in heat transfer performance could be observed at all sharp turns.…”

Section: Effect Of Geometrical Factorsmentioning

confidence: 99%

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Buoyancy effect on heat transfer in rotating smooth square U-duct at high rotation number

Yang

Deng

et al. 2014

Propulsion and Power Research

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The buoyancy effect on heat transfer in a rotating, two-pass, square channel is experimentally investigated in current work. The classical copper plate technique is performed to measure the regional averaged heat transfer coefficients. In order to perform a fundamental research, all turbulators are removed away. Two approaches of altering Buoyancy numbers are selected: varying rotation number from 0 to 2.08 at Reynolds number ranges of 10000 to 70000, and varying inlet density ratio from 0.07 to 0.16 at Reynolds number of 10000. And thus, Buoyancy numbers range from 0 to 12.9 for both cases. According to the experimental results, the relationships between heat transfer and Buoyancy numbers are in accord with those obtained under different rotation numbers. For both leading and trailing surface, a critical Buoyancy number exists for each X/D location. Before the critical point, the effect of Buoyancy number on heat transfer is limited; but after that, the Nusselt number ratios show different increase rate. Given the same rotation number, higher wall temperature ratios with its corresponding higher Buoyancy numbers substantially enhance heat transfer on both passages. And the critical exceed-point that heat transfer from trailing surface higher than leading surface happens at the same Buoyancy number for different wall temperature ratios in the second passage. Thus, the stronger buoyancy effect promotes heat transfer enhancement at high rotation number condition.

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Section: Effect Of Geometrical Factorsmentioning

confidence: 99%

“…And thus, flow in rotating channels becomes extraordinary complicated and three-dimensional. Luckily, many investigations on rotating U-ducts have been published by many previous works over the past two decades [4][5][6][7][8][9][10][11][12][13][14][15][16][17].…”

mentioning

confidence: 99%

Buoyancy effect on heat transfer in rotating smooth square U-duct at high rotation number

Yang

Deng

et al. 2014

Propulsion and Power Research

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“…Guidez (1989), Hajek, et al (1991), Wagner, at al. (1991), Yang, et al (1992) and Mochizuki, at al. (1994) conducted experimental studies on heat transfer perfomance in rotating serpentine passages of square cross section with smooth walls.…”

Section: Introductionmentioning

confidence: 95%

A Combined Experimental/Computational Study of Flow in Turbine Blade Cooling Passage: Part I — Experimental Study

Tse

McGrath

1995

Volume 4: Heat Transfer; Electric Power; Industrial and Cogeneration

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A combined experimental/computational study has been performed for flow in a rotating serpentine passage which approximates the internal cooling passage for turbine blades. Experimental results are presented in Part I and computational results, in Part II. Benchmark quality velocity measurements were acquired by laser-Doppler velocimetry at Reynolds number of 25,000 and Rotation number of 0.24. The results were used to assess the influence of the Coriolis force on the velocity characteristics and to explain the heat transfer phenomena observed in Wagner et al (1991). The results showed an increase in streamwise velocity on the high pressure side and a decrease in streamwise velocity on the low pressure due to Coriolis effect. Cross-stream, tangential and rms velocities indicated the presence of swirl, strong secondary flow and large turbulent fluctuations in the vicinity of the turns.

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“…The leading wall heat transfer is higher by 40-80% for the uniform wall heat flux condition (Case B) and by 20-40% for the condition of uneven wall temperatures (Case C) when compared with heat transfer with isothermal wall condition (Case A). Yang et al (1992) in their data for rotating serpentine square channel flow found that there is only a minor effect of rotation on the circumferentially averaged heat transfer even though there is significant redistribution of heat transfer among the leading, trailing and side walls due to rotation. A significant enhancement in heat transfer was found at the sharp turns.…”

Section: Introductionmentioning

confidence: 98%

Heat Transfer Predictions in Rotating Radial Smooth Channel: Comparative Study of k-ε Models With Wall Function and Low-Re Model

Tekriwal

1994

Volume 4: Heat Transfer; Electric Power; Industrial and Cogeneration

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The two-equation models (k -E) have been employed to predict turbulent flow and heat transfer for radially outward flow in a cooling duct rotating in orthogonal mode. The low-Reynoldsnumber model, which permits integration of the Navier-Stokes equations to the wall, has been used. The results from the low-Re model and the high-Re model with "Wall Function" are compared with the experimental data available in literature. Computations have been made for a range of Reynolds numbers (2500 to 25000) and a range of rotation numbers (0.088 to 0.24). Different conditions such as uniform wall temperature, uniform wall heat flux and uneven wall temperatures have been used as boundary conditions for heat transfer. The low-Re model does not perform as well as the Wall Function model in predicting heat transfer for flows at high Reynolds number. However, the low-Re model predictions are better than those from the high-Re Wall Function model for flows at low Reynolds number. In fact, for the geometry considered (1.27 cm x 1.27 cm duct) it becomes necessary to use the low-Re model for flows at low Reynolds number because of the limitation of the Wall Function. Heat transfer predictions from the low-Re model are within 10-40% for flows at low Reynolds number. The disadvantage of the low-Re model, in addition to the large number of cells requirement, is the slow convergence rate.

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Local Heat Transfer in a Rotating Serpentine Flow Passage

Cited by 44 publications

References 0 publications

Buoyancy effect on heat transfer in rotating smooth square U-duct at high rotation number

Buoyancy effect on heat transfer in rotating smooth square U-duct at high rotation number

A Combined Experimental/Computational Study of Flow in Turbine Blade Cooling Passage: Part I — Experimental Study

Heat Transfer Predictions in Rotating Radial Smooth Channel: Comparative Study of k-ε Models With Wall Function and Low-Re Model

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