Technical Brief

An Area-Average Correlation for Oil-Jet Cooling of Automotive Pistons

[+] Author and Article Information
J. Easter

G.G. Brown Laboratory,
University of Michigan,
Ann Arbor, MI 48109
e-mail: jeeaster@umich.edu

C. Jarrett

Department of Mechanical Engineering,
Oakland University,
Rochester, MI 48309

C. Pespisa

Department of Mechanical Engineering,
University of Massachusetts Amherst,
Amherst, MA 01003

Y. C. Liu

Department of Mechanical Engineering,
Oakland University,
Rochester, MI 48309
e-mail: yliu2@oakland.edu

A. C. Alkidas

Department of Mechanical Engineering,
Oakland University,
Rochester, MI 48309
e-mail: alkidas@oakland.edu

L. Guessous

Department of Mechanical Engineering,
Oakland University,
Rochester, MI 48309
e-mail: guessous@oakland.edu

B. P. Sangeorzan

Department of Mechanical Engineering,
Oakland University,
Rochester, MI 48309
e-mail: bsangeor@oakland.edu

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received March 22, 2012; final manuscript received March 24, 2014; published online September 30, 2014. Assoc. Editor: Alfonso Ortega.

J. Heat Transfer 136(12), 124501 (Sep 30, 2014) (4 pages) Paper No: HT-12-1125; doi: 10.1115/1.4027835 History: Received March 22, 2012; Revised March 24, 2014

Laboratory tests were performed to measure cooling rates of an impinging oil-jet on the underside of an automotive piston as functions of oil nozzle-to-piston surface spacing, oil pressure, oil temperature, and piston temperature. Based on these results, area-average Nusselt number correlations were derived for a Reynolds number range of 100–4500, a Prandtl number range of 90–750, and a nozzle-to-piston surface spacing range over 73–160 mm, which are within the ranges expected for oil-jet cooling of automotive pistons.

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Grahic Jump Location
Fig. 1

Schematic diagram of the test apparatus showing details of the test piston instrumentation and oil impingement circuit

Grahic Jump Location
Fig. 2

Plot of the area-average, heat transfer coefficient versus oil flow rate for two oil-temperature levels (100 °C and 36 °C) and three levels of nozzle-to-surface spacing (73, 116, and 160 mm)

Grahic Jump Location
Fig. 3

Convective heat transfer correlations for the undercrown of a piston undergoing oil-jet cooling



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