Experimental investigations of axial turbulence intensity effect on heat transfer enhancement in duct flow

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Title:	Experimental investigations of axial turbulence intensity effect on heat transfer enhancement in duct flow
Authors:	Chen, T.Y.;Chen, Y.H.;Lee, G.C.;Chen, S.F.
Contributors:	淡江大學航空太空工程學系
Keywords:	heat transfer;argumentation;turbulence intensity;acoustics
Date:	2001-03
Issue Date:	2010-01-11 15:03:51 (UTC+8)
Abstract:	This research applied a wind tunnel system and a loudspeaker system to investigate the only axial turbulence intensity effect on heat transfer enhancement in duct flows. The loudspeaker was attached to the exit plane of wind tunnel to generate an acoustic wave inside the wind tunnel system. Nearly constant axial velocity perturbations in the test section of wind tunnel were obtained by carefully adjusting the frequency of the generated acoustic wave. The study included the temperature measurements by thermocouples along a heated wall to obtain the Nusselt numbers and thermal boundary layers under different axial turbulence intensities. Also, the near-wall velocity fields were measured by an LDV system to check the applicability of the developed system and to characterize velocity boundary layer. The results suggest that the axial turbulence intensity plays a negligible role in heat transfer enhancement.
Relation:	中華民國2001燃燒學會民航學會航太學會學術聯合會議論文集=CIROC CSCA AASRC joint conference, pp.AA263-AA270
Appears in Collections:	[Graduate Institute & Department of Aerospace Engineering] Proceeding

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