NDLI: Air-Side Heat Transfer Enhancement by a Novel Winglet-Type Vortex Generator Array in a Round-Tube Plain-Fin Heat Exchanger

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	He, Jing Liu, Liping Anthony, M. Jacobi
Copyright Year	2009
Abstract	The impact of vortex generator (VG) arrays for air-side heat transfer enhancement is experimentally investigated by full-scale wind-tunnel testing of a plain-fin-and-tube heat exchanger. The VG array is deployed in a “V” to try to create a constructive interference between vortices. Each array is composed of two delta-winglet pairs (four VGs), and placed at an attack angle of 10° or 30°. The frontal air velocity considered is between 2.3–5.4 m/s, corresponding to a Reynolds number range based on the hydraulic diameter of 1500–3400. The thermal-hydraulic performance of the heat exchanger with and without VG enhancement is provided under dry-surface conditions. The experimental results indicate little impact at a relatively small attack angle of 10°. While for the 30° array, a 25–55% augmentation in air-side heat transfer coefficient is measured, but with a pressure drop penalty of 100%. Nevertheless, performance evaluation using the area goodness factor and the volume goodness factor both indicate the superiority of the enhanced heat exchanger by the 30° array over the entire Reynolds number range. The proposed array is found more effective at comparatively low Reynolds numbers, representative of many HVAC&R applications and compact heat exchanger designs.
Sponsorship	Heat Transfer Division
Starting Page	575
Ending Page	582
Page Count	8
File Format	PDF
ISBN	9780791843567
DOI	10.1115/HT2009-88164
e-ISBN	9780791838518
Volume Number	Volume 1: Heat Transfer in Energy Systems; Thermophysical Properties; Heat Transfer Equipment; Heat Transfer in Electronic Equipment
Conference Proceedings	ASME 2009 Heat Transfer Summer Conference collocated with the InterPACK09 and 3rd Energy Sustainability Conferences
Language	English
Publisher Date	2009-07-19
Publisher Place	San Francisco, California, USA
Access Restriction	Subscribed
Subject Keyword	Vortex generator “v” formation Winglet array Heat exchanger Fin-and-tube Generators Heat exchangers Heat transfer Vortices
Content Type	Text
Resource Type	Article

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