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research-article

Experimental Investigation of Rotational Effects on Heat Transfer Enhancement Due to Crossflow Induced Swirl Using Transient Liquid Crystal Thermography

[+] Author and Article Information
Li Yang

Department of Mechanical Engineering, University of Pittsburgh, Pittsburgh PA 15261
thudteyl@gmail.com

Prashant Singh

Department of Mechanical Engineering, 635 Prices Fork Rd, Goodwin Hall Room 445, Dept. of Mechanical Engineering, Virginia Tech, Blacksburg, VA, 24061
psingh1@vt.edu

Kartikeya Tyagi

Department of Mechanical Engineering, Virginia Tech, Blacksburg VA 24061
ktvt91@vt.edu

Jaideep Pandit

Department of Mechanical Engineering, Virginia Tech, Blacksburg VA 24061
jpandit@vt.edu

Srinath V. Ekkad

Department of Mechanical Engineering, Virginia Tech, Blacksburg VA 24061
sekkad@ncsu.edu

Jing Ren

Department of Thermal Engineering, Tsinghua University, Beijing, China 100084
renj@tsinghua.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4038538 History: Received March 27, 2017; Revised September 25, 2017

Abstract

Rotational effects lead to significant non-uniformity in heat transfer enhancement and this effect is directly proportional to the rotation number (Ro=OD/V). Hence the development of cooling designs which have less dependence on rotation is imperative. This paper studied the effect of rotation on crossflow induced swirl configuration with the goal of demonstrating a new design that has lesser response towards rotational effects. The new design passes coolant from one pass to the second pass through a set of angled holes to induce impingement and swirling flow to generate higher heat transfer coefficients than typical ribbed channels with 180-deg bend between the two passages. Detailed heat transfer coefficients are presented for stationary and rotating conditions using transient liquid crystal thermography. The channel Reynolds number based on the channel hydraulic diameter and channel velocity at inlet/outlet ranged from 25,000 to 100,000. The rotation number ranged from 0 to 0.14. Results show that rotation reduced the heat transfer on both sides of the impingement due to the Coriolis force. The maximum local reduction of heat transfer in the present study was about 30%. Rotation significantly enhanced the heat transfer near the closed end because of the centrifugal force and the 'pumping' effect, which caused local heat transfer enhancements up to 100%. Compared to U-bend two pass channels, impingement channels had advantages in the upstream channel and the end region, but heat transfer performance was not beneficial on the leading side of the downstream channel.

Copyright (c) 2017 by ASME
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