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research-article

Detailed Heat Transfer Measurements of Jet Impingement on Dimpled Target Surface under Rotation

[+] Author and Article Information
Prashant Singh

Department of Mechanical Engineering, 445 Goodwin Hall, 635 Prices Fork Road, Blacksburg, VA 24060
psingh1@vt.edu

Srinath V. Ekkad

Department of Mechanical Engineering, 445 Goodwin Hall, 635 Prices Fork Road, Blacksburg, VA 24060
sekkad@ncsu.edu

1Corresponding author.

ASME doi:10.1115/1.4039054 History: Received July 11, 2016; Revised November 28, 2017

Abstract

The present study investigates the effects of Coriolis force and centrifugal buoyancy force on heat transfer due to jet impingement on dimpled target surface. Detailed heat transfer measurements were carried out using transient liquid crystal thermography, where the target surface was modeled as one-dimensional semi-infinite solid. Three different configurations of dimpled target surfaces have been studied. The flow and rotation conditions have been kept the same for all the configurations, where the average Reynolds number (based on jet hole hydraulic diameter: Re_j) was 2500 and the rotational speed was 400 RPM (corresponding to Ro_j of 0.00274). Under non-rotating conditions, dimpled target surface showed positive heat transfer enhancements compared to smooth target surfaces. Under rotating conditions, it was observed that rotation was helpful in enhancing heat transfer on leading and trailing sides for smooth target surface. However, for the dimpled target surfaces, rotation proved to be detrimental to heat transfer enhancement.

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