Transient laminar conjugate heat transfer of a rotating disk: theory and numerical simulations

The conjugate heat transfer in a stationary cylindrical cavity with a rotating disk and fluid through-flow is analysed at various rotational speeds ranging from 10000 to 50000 rpm by using a finite volume commercial code. The numerical model and code are validated for a problem, which involves rotation and fluid through-flow. A reduction of the thermal boundary layer thickness and increase in the heat transfer coefficients are observed with increase in the rotational speed. Marked differences are noticed between the Nusselt numbers obtained from the conjugate and constant temperature analyses.

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Conjugate Heat Transfer in an Arbitrary Shaped Cavity with a Rotating Disk

Heat Transfer Engineering ◽

10.1080/01457630490520301 ◽

2004 ◽

Vol 25 (8) ◽

pp. 69-79 ◽

Cited By ~ 2

Author(s):

REBY ROY K. E. ◽

B. V. S. S. S. PRASAD ◽

S. SRINIVASA MURTHY ◽

N. K. GUPTA

Keyword(s):

Heat Transfer ◽

Conjugate Heat Transfer ◽

Rotating Disk

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Investigating Heat Transfer in a Straight Cooling Passage Using Transient Infrared Temperature Data and URANS Conjugate Heat Transfer Analysis

10.1115/gt2021-60381 ◽

2021 ◽

Author(s):

Louis Christensen ◽

Richard Celestina ◽

Spencer Sperling ◽

Randall Mathison ◽

Hakan Aksoy ◽

...

Keyword(s):

Heat Transfer ◽

Numerical Simulations ◽

Turbulence Model ◽

Experimental Work ◽

Conjugate Heat Transfer ◽

External Surface ◽

Average Error ◽

Spatial Accuracy ◽

Conduction Model ◽

Cooling Passage

Abstract Experimental work measuring heat transfer due to internal convection on a smooth straight passage is recreated using unsteady Reynolds averaged Navier-Stokes conjugate heat transfer simulations. The experimental work utilizes 1-dimensional and 3-dimensional conduction models to determine internal heat transfer rates from external surface temperature measurements collected with an infrared camera. The numerical simulations recreated these experiments to verify the conduction model and investigate the differences between the k-ω shear stress transport turbulence model, Reynolds stress turbulence model, and the k-ε turbulence model. It is found that the conduction model can accurately predict the heat transfer in the passage within an average error of 6% but with reduced spatial accuracy. The lower spatial accuracy can be accounted for by utilizing both the conduction model to predict the magnitude of the heat transfer and the numerical simulations to capture the spatial distribution. No one turbulence model was found to provide consistently superior heat transfer predictions, but rather each model excelled in some scenarios and underperformed in others. Overall, the k-ε model was found to best match the experimental heat transfer calculations with an average error of 5.9% of the total heat transfer, and it takes a more conservative approach as it can over predict the external surface temperatures by approximately 0.4 K. The end goal of this study is to develop a way to derive heat-flux data from infrared measurements on a range of geometries. A simple and well-understood geometry is investigated here to provide a firm foundation for future work.

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Numerical Simulations for Conjugate Heat Transfer from Heat Sources Mounted on a Conductive Wall

The Proceedings of The Computational Mechanics Conference ◽

10.1299/jsmecmd.2002.15.679 ◽

2002 ◽

Vol 2002.15 (0) ◽

pp. 679-680 ◽

Cited By ~ 2

Author(s):

Hideo YOSHINO ◽

Xing ZHANG ◽

Motoo FUJII

Keyword(s):

Heat Transfer ◽

Numerical Simulations ◽

Conjugate Heat Transfer ◽

Heat Sources

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Steady-State Fluid-Solid Mixing Plane to Replace Transient Conjugate Heat Transfer Computations during Design Phase

International Journal of Turbomachinery Propulsion and Power ◽

10.3390/ijtpp6020006 ◽

2021 ◽

Vol 6 (2) ◽

pp. 6

Author(s):

Lucian Hanimann ◽

Luca Mangani ◽

Ernesto Casartelli ◽

Elmar Gröschel ◽

Magnus Fischer

Keyword(s):

Heat Transfer ◽

Steady State ◽

Conjugate Heat Transfer ◽

Pressure Ratio ◽

Jet Impingement ◽

Rotating Disk ◽

Propagation Time ◽

Back Side ◽

Thermal Loads ◽

Physical Point

The demand for increased turbomachinery performance, both, towards higher pressures and temperatures, leads to high thermal-loads of specific components and can critically affect mechanical integrity. In the particular case of rotating-disk configurations, like the back-side of wheels or in cavities, a very efficient way for cooling is jet impingement. An example for this situation are high pressure-ratio turbochargers, where cooling of the impeller disk (back wall) is introduced to achieve tolerable thermal loads. From the physical point of view, jet impingement on a rotating wall generates an unsteady heat transfer situation. On the other end, accurate values of time-averaged temperatures would be sufficient for design purposes. In general, obtaining circumferentially time-averaged solutions requires transient analysis of the conjugate heat transfer (CHT) process to account for the mean effect of jet cooling on solids. Such analysis is computationally expensive, due to the difference in information propagation time-scale for the solid and the fluid. In this paper, a new approach to directly compute circumferentially time-averaged (i.e., steady-state) temperature distributions for rotating-disk CHT problems is presented based on an adaption of the well known fluid-fluid mixing plane approach.

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