Characterization and Scaling of Forced Convective Swirl in Sinusoidal Wavy-Plate-Fin Cores of Compact Heat ExchangersSource: Journal of Heat Transfer:;2020:;volume( 143 ):;issue: 002::page 021901-1DOI: 10.1115/1.4048921Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: 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.
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contributor author | Shi, Dantong | |
contributor author | Lin, Kuan-Ting | |
contributor author | Jog, Milind A. | |
contributor author | Manglik, Raj M. | |
date accessioned | 2022-02-05T22:26:31Z | |
date available | 2022-02-05T22:26:31Z | |
date copyright | 11/16/2020 12:00:00 AM | |
date issued | 2020 | |
identifier issn | 0022-1481 | |
identifier other | ht_143_02_021901.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl1/handle/yetl/4277538 | |
description abstract | 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. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Characterization and Scaling of Forced Convective Swirl in Sinusoidal Wavy-Plate-Fin Cores of Compact Heat Exchangers | |
type | Journal Paper | |
journal volume | 143 | |
journal issue | 2 | |
journal title | Journal of Heat Transfer | |
identifier doi | 10.1115/1.4048921 | |
journal fristpage | 021901-1 | |
journal lastpage | 021901-13 | |
page | 13 | |
tree | Journal of Heat Transfer:;2020:;volume( 143 ):;issue: 002 | |
contenttype | Fulltext |