Title

End Wall Heat Transfer And Pressure Drop Measurements In A Rectangular Channel With Porous Turbulators

Abstract

Heat transfer and pressure drop are measured in a rectangular channel (aspect ratio=2) containing six porous foam blockages (pore densities 70 and 40 ppi) in (i) solid foam (ii) corrugated foam configuration. Three of the six blockages are heated to measure the heat transfer coefficients on the end wall. The Reynolds numbers tested are based on (i) open channel hydraulic diameter ranging between 20,000 and 60,000; (ii) pore diameter ranging between 100 and 400. Two different channel blockage ratios are tested (i)Bh/Dh = 0.09, (ii) Bh/Dh = 0.37 with the pitch (spacing between leading edges of adjacent foams) fixed to be 3. Pressure drop is measured using static pressure taps located on the side walls of the channel. The porous foams are seen to promote heat transfer as high as 1100% of that of a smooth wall channel (Bh/Dh=0) in the Bh/Dh=0.37 configuration. This is primarily due to the flow path tortuosity that increases the convective heat transfer. The friction factor was the highest for the solid foam configuration (Bh/Dh=0.37). A numerical study is also performed as part of this investigation primarily for (i) flow visualization and pressure drop prediction (ii) model foams with different porosities (0.95, 0.25, 0.75). A non-Darcy formulation is used in the numerical model with a packed bed assumption. The maximum experimental uncertainties associated with the Nusselt number and friction factor are calculated to be ±9.18% and ±4.79% respectively. Results reported include module averaged Nusselt number, friction factor, and thermal performance for each foam configuration on (i) the foam endwall and (ii) confinement wall (between two adjacent foams). Comparisons are made with the published literature to show the standing of the present work. © 2011 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

Publication Date

1-1-2011

Publication Title

47th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit 2011

Number of Pages

-

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.2514/6.2011-6097

Socpus ID

85088758892 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85088758892

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