NDLI: CFD Analysis Prediction of Heat Transfer Coefficient in Rotating Cavities With Radial Outflow

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Wu, Charles Vaisman, Boris Mccusker, Kevin Paolillo, Roger
Copyright Year	2006
Abstract	This paper documents two related investigations. The first investigation was to benchmark commercial CFD code Fluent in rotating cavities for velocity profiles and beat transfer coefficients. The second investigation was to evaluate the methods of extracting heat transfer coefficients from CFD solution with direct method and Reynolds analogy approach. The rotating cavities examined include rotor-stator, contra-rotating and co-rotating disks. The velocity profiles benchmark was conducted prior to heat transfer coefficient benchmark. Several turbulence models were compared for closed rotating cavity flows. The comparisons between test data and CFD results of tangential and radial velocity profiles showed that the SST k-ω turbulence model performed the best among turbulence models tested. Hence, the SST k-ω model was chosen for heat transfer coefficient benchmarking. The comparisons of heat transfer coefficients between test data and CFD results were presented in the form of local Nusselt number. The thermal wall boundary conditions applied to all the computations were curved-fitted wall temperature distributions from available test data. The wall temperature distributions include approximately constant, positive and negative profiles. It was found that the accurate information of the thermal wall temperature distribution was critical to the benchmark and that only the CFD results with well defined information of wall temperature distributions matched well with test data. The Nusselt number extracted from the CFD solution with the Reynolds analogy approach tends to over predict the heat transfer coefficient on the higher radii and only matched test data at low Reynolds number with positive wall temperature profile. The error increases with higher Reynolds number and decreases with larger flow rate.
Sponsorship	International Gas Turbine Institute
Starting Page	1515
Ending Page	1525
Page Count	11
File Format	PDF
ISBN	079184241X
DOI	10.1115/GT2006-91078
e-ISBN	0791837742
Volume Number	Volume 6: Turbomachinery, Parts A and B
Conference Proceedings	ASME Turbo Expo 2006: Power for Land, Sea, and Air
Language	English
Publisher Date	2006-05-08
Publisher Place	Barcelona, Spain
Access Restriction	Subscribed
Subject Keyword	Turbulence Computational fluid dynamics Reynolds number Rotors Cavity flows Flow (dynamics) Wall temperature Cavities Errors Computation Stators Outflow Boundary-value problems Disks Heat transfer coefficients
Content Type	Text
Resource Type	Article

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