Heat transfer and pressure loss penalty for the number of tube rows of staggered finned-tube bundles with a single transverse row of winglets

Kwak, Kyung Min; Torii, Kahoru; Nishino, Koichi

doi:10.1016/s0017-9310(02)00235-1

Cited by 47 publications

(18 citation statements)

References 3 publications

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“…These appropriate thermal-hydraulic specifications of the VGs as a passive heat transfer enhancement technique have motivated many investigators to study and optimize the performance of these geometries in different heat exchange systems, such as circular and noncircular ducts [6][7][8][9][10][11][12], flat PFHE [13][14][15][16][17][18], tube-fin heat exchanger [19][20][21][22][23][24][25][26][27], heat sink [28,29], electronic chip [30,31], and micro-and-mini channels [32]. However, in most studies gases were often used as the heat transfer medium, and studies of liquids are very low.…”

Section: Introductionmentioning

confidence: 99%

Thermal performance of plate-fin heat exchanger using passive techniques: vortex-generator and nanofluid

Khoshvaght-Aliabadi

2015

Heat Mass Transfer

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Section: Introductionmentioning

confidence: 99%

Thermal performance of plate-fin heat exchanger using passive techniques: vortex-generator and nanofluid

Khoshvaght-Aliabadi

2015

Heat Mass Transfer

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“…Kwak et al [38] compared CFU and CFD configurations in an open-circuit vertical wind tunnel measurement where thermometry was done using platinum wire. An imaging infrared camera was used to observe the flow field.…”

Section: Experimental Methodsmentioning

confidence: 99%

Augmentation of Heat Transfer by Creation of Streamwise Longitudinal Vortices Using Vortex Generators

Biswas

Chattopadhyay

Sinha

2012

Heat Transfer Engineering

107

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This paper summarizes the current state of the art related to improvement of the heat exchanger surfaces using streamwise longitudinal vortices. Primarily, the improvements related to fin-tube cross-flow heat exchangers and the plate-fin heat exchangers have been addressed. Protrusions in certain forms, such as delta wings or winglet pairs, act as vortex generators, which can enhance the rate of heat transfer from the heat-exchanger surfaces that may be flat or louvered. The strategically placed vortex generators create longitudinal vortices, which disrupt the growth of the thermal boundary layer, promote mixing between fluid layers, and hence lead to augmentation in heat transfer. The flow fields are dominated by swirling motion associated with modest pressure penalty. Heat transfer is augmented substantially for all the proposed configurations of the longitudinal vortex generators, such as delta wings, rectangular winglet pairs, and delta winglet pairs, with varying degree of pressure penalty. Both computational and experimental investigations on flow and heat transfer in the heat exchanger passages with built-in vortex generators are revisited and summarized.

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“…They obtained excellent results for the common flow up configuration as compared to the common flow down configuration of the DWP. Kwak et al (2003) performed another experimental investigation to study the effect of number of tube rows (2 ≤ N r ≤ 5) on the heat transfer and pressure drop of plain-finned-tube heat exchanger with one row of DWP in common flow up configuration. The experimental setup and Reynolds number range were the same as in the previous study.…”

Section: 2c Fins With Vortex Generatorsmentioning

confidence: 99%

“…Tang et al (2009a) studied slit fin, plain fin and fin with DWPs and observed that the heat transfer coefficient and friction factor were independent of number of tube rows (6 ≤ N r ≤ 12). For fin with DWPs, Kwak et al (2003) varied the tube rows in the range of 2 ≤ N r ≤ 5, and observed that the Colburn factor was maximum for 2 rows and decreased as the row number was increased. The friction factor was minimum for 3 rows and beyond Re > 1000, the effect of row number on the friction factor diminished.…”

Section: Number Of Tube Rowsmentioning

confidence: 99%

A review on the thermal hydraulic characteristics of the air-cooled heat exchangers in forced convection

Kumar

Joshi

Nayak

et al. 2015

Sadhana

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In this paper, a review is presented on the experimental investigations and the numerical simulations performed to analyze the thermal-hydraulic performance of the air-cooled heat exchangers. The air-cooled heat exchangers mostly consist of the finned-tube bundles. The primary role of the extended surfaces (fins) is to provide more heat transfer area to enhance the rate of heat transfer on the air side. The secondary role of the fins is to generate vortices, which help in enhancing the mixing and the heat transfer coefficient. In this study, the annular and plate fins are considered, the annular fins are further divided into four categories: (1) plane annular fins, (2) serrated fins, (3) crimped spiral fins, (4) perforated fins, and similarly for the plate fins, the fin types are: (1) plain plate fins, (2) wavy plate fins, (3) plate fins with DWP, and (4) slit and strip fins. In Section 4, the performance of the various types of fins is presented with respect to the parameters: (1) Reynolds number, (2) fin pitch, (3) fin height, (4) fin thickness, (5) tube diameter, (6) tube pitch, (7) tube type, (8) number of tube rows, and (9) effect of dehumidifying conditions. In Section 5, the conclusions and the recommendations for the future work have been given.

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Heat transfer and pressure loss penalty for the number of tube rows of staggered finned-tube bundles with a single transverse row of winglets

Cited by 47 publications

References 3 publications

Thermal performance of plate-fin heat exchanger using passive techniques: vortex-generator and nanofluid

Thermal performance of plate-fin heat exchanger using passive techniques: vortex-generator and nanofluid

Augmentation of Heat Transfer by Creation of Streamwise Longitudinal Vortices Using Vortex Generators

A review on the thermal hydraulic characteristics of the air-cooled heat exchangers in forced convection

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