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International Heat Transfer Conference 12

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

Experimental and Numerical Investigation of Thermal-Hydraulic Characteristics of a Wavy-Channel Compact Heat Exchanger

Arun Muley
Honeywell Engines & Systems, Torrance, CA 90504, USA

Joseph B. Borghese
Honeywell Engines & Systems, Torrance, CA 90504, USA

Raj M. Manglik
Thermal-Fluids and Thermal Processing Laboratory, Mechanical and Materials Engineering, University of Cincinnati, 2600 Clifton Ave, Cincinnati, OH 45220, USA

Jaydeep Kundu
Thermal-Fluids & Thermal Processing Laboratory, University of Cincinnati, Cincinnati, OH 45221-0072, USA

DOI: 10.1615/IHTC12.340
6 pages

Abstract

This paper presents steady-state heat transfer and isothermal pressure drop results for a novel wavy-channel heat exchange core. The wavy geometry has a corrugation aspect ratio (γ = 2α/λ) of 0.15, and duct aspect ratio (α = h/w) of 0.4533. Experimental measurements for Colburn factor j and Fanning friction factor f are obtained for laminar flows (70 ≤ Re ≤ 830) of water (Pr ~ 6). Also, a CFD model is developed to simulate periodically developed laminar flows in the wavy channel using the control-volume based commercial code FLUENT. The computational f and j predictions are in excellent agreement (±10%) with the experimental data. Local temperature and flow field simulations show a complex influence of the channel geometry. Based on the experimental and numerical results, f and j correlations are devised for the wavy-core performance and design tradeoffs. The wavy channels provide 1.40 to 2.35 times higher j/f compared to an equivalent straight duct, and up to 4.3 times higher heat transfer for the fixed geometry and pumping power constraint.

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