Pure thermal plumes have been investigated by two-dimensional (2D) and three-dimensional (3D) particle imaging velocimetry (PIV) techniques. While classical plume features have been checked out, time-dependent analysis allows one to clearly detect contraction and expulsion phases which are mainly driven by turbulent structure behavior. Balance of momentum equation demonstrates the link between stronger structures and expulsion-contraction motion mainly dominated by plume engulfment during contraction phases. A ratio of 3 between entrained mass flow rate during contraction and expulsion phases has been estimated. A new method, never previously applied to pure thermal plume, allows one to accurately characterize entrainment mechanism and for the first time, the latter renders it possible to estimate the entrainment coefficient all along the plume height, even close to the heating source. Moreover, entrainment coefficient is found to be 20% higher with direct method as opposed to the classical differential one widely used in the literature. Such a huge gap is found to be due to the fluctuating density and velocity part. Even through it markedly contributes to an enhanced entrainment mechanism, the role of fluctuation was generally overlooked in the previous works devoted to entrainment coefficient estimate.
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Three-Dimensional Characterization of a Pure Thermal Plume
Minh Vuong Pham, Ph.D. Student,
Minh Vuong Pham, Ph.D. Student
Laboratoire d’Etudes Thermiques, Ecole Nationale Supe´rieure de Me´canique et d’Ae´rotechnique, Te´le´port 2, 1 Avenue Cle´ment Ader, BP 40109, 86961 Futuroscope Cedex, France
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Fre´de´ric Plourde, Senior CNRS Scientist,
Fre´de´ric Plourde, Senior CNRS Scientist
Laboratoire d’Etudes Thermiques, Ecole Nationale Supe´rieure de Me´canique et d’Ae´rotechnique, Te´le´port 2, 1 Avenue Cle´ment Ader, BP 40109, 86961 Futuroscope Cedex, France
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Son Doan Kim, Professor
Son Doan Kim, Professor
Laboratoire d’Etudes Thermiques, Ecole Nationale Supe´rieure de Me´canique et d’Ae´rotechnique, Te´le´port 2, 1 Avenue Cle´ment Ader, BP 40109, 86961 Futuroscope Cedex, France
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Minh Vuong Pham, Ph.D. Student
Laboratoire d’Etudes Thermiques, Ecole Nationale Supe´rieure de Me´canique et d’Ae´rotechnique, Te´le´port 2, 1 Avenue Cle´ment Ader, BP 40109, 86961 Futuroscope Cedex, France
Fre´de´ric Plourde, Senior CNRS Scientist
Laboratoire d’Etudes Thermiques, Ecole Nationale Supe´rieure de Me´canique et d’Ae´rotechnique, Te´le´port 2, 1 Avenue Cle´ment Ader, BP 40109, 86961 Futuroscope Cedex, France
Son Doan Kim, Professor
Laboratoire d’Etudes Thermiques, Ecole Nationale Supe´rieure de Me´canique et d’Ae´rotechnique, Te´le´port 2, 1 Avenue Cle´ment Ader, BP 40109, 86961 Futuroscope Cedex, France
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received September 1, 2004; revision received November 24, 2004. Review conducted by: J. H. Lienhard V.
J. Heat Transfer. Jun 2005, 127(6): 624-636 (13 pages)
Published Online: June 6, 2005
Article history
Received:
September 1, 2004
Revised:
November 24, 2004
Online:
June 6, 2005
Citation
Pham, M. V., Plourde, F., and Kim, S. D. (June 6, 2005). "Three-Dimensional Characterization of a Pure Thermal Plume ." ASME. J. Heat Transfer. June 2005; 127(6): 624–636. https://doi.org/10.1115/1.1863275
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