Characterization and Scaling of Forced Convective Swirl in Sinusoidal Wavy-Plate-Fin Cores of Compact Heat Exchangers

Shi, Dantong; Lin, Kuan-Ting; Jog, Milind A.; Manglik, Raj M.

doi:10.1115/1.4048921

Characterization and Scaling of Forced Convective Swirl in Sinusoidal Wavy-Plate-Fin Cores of Compact Heat Exchangers

Journal Article · Mon Nov 16 00:00:00 EST 2020 · Journal of Heat Transfer

DOI:https://doi.org/10.1115/1.4048921· OSTI ID:1797980

Shi, Dantong ^[1]; Lin, Kuan-Ting ^[2]; Jog, Milind A. ^[2]; Manglik, Raj M. ^[2]

Univ. of Cincinnati, OH (United States); University of Cincinnati
Univ. of Cincinnati, OH (United States)

The characterization and scaling of the thermal-hydraulic performance in wavy plate-fin compact heat exchanger cores, based on the understanding of the physical phenomena and heat transfer enhancement mechanism is delineated. Experimental data are presented for forced convection in air (Pr = 0.71) with flow rates in the range 50 ≤ Re ≤ 4000. A variety of wavy-fin cores that span viable applications, with geometrical attributes described by the cross section aspect ratio α (ratio of fin spacing to height), fin corrugation aspect ratio γ (ratio of 2× corrugation amplitude to wave pitch), and fin spacing ratio ζ (ratio of fin spacing to wave pitch), are considered. To characterize and correlate the vortex-flow mixing in interfin spaces, a Swirl number Sw is introduced from the balance of viscous, inertial and centrifugal forces. It is shown that the laminar, transitional and turbulent flow regimes can be explicitly identified by this Swirl number. Based on the experimental results and extended analysis, new correlations for Fanning friction factor f and Colburn factor j are developed with Sw, α, γ, and ζ as scaling parameters. Requisite expressions are devised by a superposition of both enhancement components due to the corrugated surface area enlargement and induced swirl flow field, and they are combined to cover the laminar, transitional and turbulent regimes by the method of asymptotic matching. The resulting generalized correlations are further shown to predict all available experimental data for f and j factors to within ±20% and ±15%, respectively.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Cincinnati, OH (United States)

Sponsoring Organization:: USDOE Advanced Research Projects Agency - Energy (ARPA-E)

Grant/Contract Number:: AR0000577

OSTI ID:: 1797980

Journal Information:: Journal of Heat Transfer, Journal Name: Journal of Heat Transfer Journal Issue: 2 Vol. 143; ISSN 0022-1481

Publisher:: ASMECopyright Statement

Country of Publication:: United States

Language:: English

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