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Research Papers: Micro/Nanoscale Heat Transfer

Optimization of Heat Exchange in Manifold-Microchannel Grooves

[+] Author and Article Information
Foluso Ladeinde

Department of Mechanical Engineering,
Stony Brook University,
100 Nicolls Road,
Stony Brook, NY 11794
e-mail: Foluso.Ladeinde@stonybrook.edu

Alabi Kehinde

TTC Technologies, Inc.,
2100 Middle Country Road,
Centereach, NY 11720
e-mail: Alabi@ttctech.com

Wenhai Li

TTC Technologies, Inc.,
2100 Middle Country Road,
Centereach, NY 11720
e-mail: wenhai@ttctech.com

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received April 19, 2017; final manuscript received April 21, 2018; published online May 25, 2018. Assoc. Editor: Thomas Beechem.

J. Heat Transfer 140(9), 092403 (May 25, 2018) (9 pages) Paper No: HT-17-1218; doi: 10.1115/1.4040141 History: Received April 19, 2017; Revised April 21, 2018

Manifold-microchannel (MM) combinations used on heat transfer surfaces have shown the potential for superior heat transfer performance to pressure drop ratio when compared with chevron-type corrugations for plate (frame) heat exchangers (PHEs). This paper presents an advanced genetic algorithm (GA)-based procedure for analyzing and optimizing the MM-based PHE. One distinctive feature of the implementation is the blended variable formulation for the chromosomes to allow the use of continuous variables rather than the bitwise variables in standard GA methods. The resulting GA procedure is particularly well suited for PHEs for several reasons, including the fact that it does not require continuous variables or functional dependence on the design variables. In addition, the computational effort required for the GA technique in the current implementation scales linearly with the number of design variables, making it appropriate for MM-based PHEs, which have several variables. The computed results compare well with experimental data and show better performance compared to conventional PHEs of the same volume utilizing chevron corrugations. Although a full-scale computational fluid dynamics (CFD) analysis may give more accurate results than the semi-empirical approach used in this paper, the former cannot efficiently support rapid concept de-selection during the preliminary stage of design. Optimization based on CFD also can usually not support discontinuous functions. To improve the fidelity of the current analysis, a discrete, finite-volume-type, one-dimensional (1D) reduced-order modeling is carried out, in addition to a purely bulk approach. Our discrete approach obviates the need for the є-NTU-type models.

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Figures

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Fig. 4

A chevron fin arrangement

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Fig. 3

Manifold-microchannel geometric variables

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Fig. 2

Manifold-microchannel arrangement: (a) 3D cut-away view and (b) top view

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Fig. 1

Manifold-microchannel heat transfer enhancement between HEX plates

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Fig. 5

Segmenting scheme for plate-frame HEXs showing (a) 1 × 2 pass and (b) 2 × 3 passes. The dots in (a) indicate nodal points in the sections of a segment.

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Fig. 6

Details of flow in the cells of a 1D stream

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Fig. 8

Some of the realizations in the vicinity of the GA optimal value

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Fig. 7

Convergence of the GA procedure illustrated with weight as the fitness function

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Fig. 9

Comparison of Colburn factor between MM and chevron corrugations

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Fig. 10

Comparison of friction factor between MM and chevron corrugations

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Fig. 11

Comparison of heat transfer per unit volume and temperature drop for the MM calculations between current procedure and experiments

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Fig. 12

Comparison of COP per unit temperature drop for the manifold-microchannel calculations between current procedure and experiments

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