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Journal of Enhanced Heat Transfer
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ISSN Druckformat: 1065-5131
ISSN Online: 1563-5074

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v4.i3.30
pages 187-201

Enhanced Heat Transfer Characteristics of Single-Phase Flows in a Plate Heat Exchanger with Mixed Chevron Plates

Arun Muley
Department of Mechanical, Industrial and Nuclear Engineering University of Cincinnati, Cincinnati, OH 45221-0072
Raj M. Manglik
Thermal-Fluids and Thermal Processing Laboratory, Mechanical and Materials Engineering, University of Cincinnati, 2600 Clifton Ave, Cincinnati, OH 45220, USA

ABSTRAKT

The enhanced thermal-hydraulic performance of single-phase flows in a plate heat exchanger with mixed chevron plates is investigated experimentally. The mixed arrangement consists of plates with chevron angle β = 30° and 60°, alternatingly stacked in a single-pass, U-type, counterflow configuration. Vegetable oil (130 < Pr < 220) and water (2.4 < Pr < 4.5) are used as test fluids, with flow rates in the laminar, transition, and turbulent flow regimes (2 < Re < 6000). Results for isothermal friction factor and heat transfer under cooling conditions, along with respective correlations for laminar (2 < Re < 400) and fully developed turbulent (Re ≥ 1000) flows are presented; transition is observed to set in when Re ∼ 500. The heat transfer data are obtained from controlled experiments, employing an extension of the Wilson Plot technique. A comparison of the data with previously reported results and predictive equations for Nu and / highlights the latter’s lack of general applicability, and the need for a larger database. The relative impact of using mixed chevron plate arrangement is discussed, and their enhanced performance, in comparison with parallel-plate channels, is evaluated.


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