Jet Impingement Heat Transfer Enhancement by Packing High-Porosity Thin Metal Foams between Jet Exit Plane and Target Surface

[+] Author and Article Information
Srivatsan Madhavan

911 Oval Dr, Engineering Building III Room 3002 Raleigh, NC 27695 smadhav5@ncsu.edu

Prashant Singh

911 Oval Dr, Room 3002 Raleigh, NC 27695 psingh23@ncsu.edu

Srinath V. Ekkad

911 Oval Dr., 3002 EB III, Mech & Aerospace Engg Raleigh, NC 27695 sekkad@ncsu.edu

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the Journal of Thermal Science and Engineering Applications. Manuscript received December 18, 2018; final manuscript received April 2, 2019; published online xx xx, xxxx. Assoc. Editor: Steve Q. Cai.

ASME doi:10.1115/1.4043470 History: Received December 18, 2018; Accepted April 03, 2019


High porosity metal foams are known for providing high heat transfer rates, as they provide significant increase in wetted surface area as well as highly tortuous flow paths resulting in enhanced mixing. Further, jet impingement offers high convective cooling, particularly at the jet footprint areas on the target surface due to flow stagnation. In this study, high porosity thin metal foams were subjected to array jet impingement, for a special crossflow scheme. High porosity (92.65%), high pore density (40 pores per inch, ppi) and thin foams (3 mm) have been used. In order to reduce the pumping power requirements imposed by full metal foam design, two striped metal foam configurations were also investigated. For that, the jets were arranged in 3 × 6 array (x/dj = 3.42, y/dj = 2), such that the crossflow is dominantly sideways. Steady state heat transfer experiments have been conducted for varying jet-to-target plate distance z/dj = 0.75, 2 and 4 for Reynolds numbers ranging from 3000 to 12000. The baseline case was jet impingement onto a smooth target surface. Enhancement in heat transfer due to impingement onto thin metal foams has been evaluated against the pumping power penalty. For the case of z/dj = 0.75 with the base surface fully covered with metal foam, an average heat transfer enhancement of 2.42 times was observed for a concomitant pressure drop penalty of 1.67 times over the flow range tested.

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