Finite circular fin method for wavy fin-and-tube heat exchangers under fully and partially wet surface conditions

Pirompugd, Worachest; Wang, Chi-Chuan

doi:10.1016/j.ijheatmasstransfer.2007.11.049

Cited by 22 publications

(16 citation statements)

References 23 publications

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“…The overall heat transfer coefficient and heat transfer performance were obtained using Equations (7) and (8), and the log mean temperature difference (LMTD) was determined by Equation (5).…”

Section: Experimental Conditions and Results Analysismentioning

confidence: 99%

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Thermal Characteristics of a Primary Surface Heat Exchanger with Corrugated Channels

Seo

Cho²,

Lee

et al. 2015

Entropy

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This paper presents the heat transfer and pressure drop characteristics of a primary surface heat exchanger (PSHE) with corrugated surfaces. The PSHE was experimentally investigated for a Reynolds number range of 156-921 under various flow conditions on the hot and cold sides. The inlet temperature of the hot side was maintained at 40˝C, while that of the cold side was maintained at 20˝C. A counterflow was used as it has a higher temperature proximity in comparison with a parallel flow. The heat transfer rate and pressure drop were measured for various Reynolds numbers on both the hot and cold sides of the PSHE, with the heat transfer coefficients for both sides computed using a modified Wilson plot method. Based on the results of the experiment, both Nusselt number and friction factor correlations were suggested for a PSHE with corrugated surfaces.

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Section: Experimental Conditions and Results Analysismentioning

confidence: 99%

“…Pirompugd et al [8] examined the heat and mass transfer performances of wavy fin-type and tube-type heat exchangers. By analyzing the circular fin under three different conditions-high humidity, average humidity and dry-it was found that the degree of inlet humidity had little effect on the heat and mass transfer characteristics.…”

Section: Introductionmentioning

confidence: 99%

Thermal Characteristics of a Primary Surface Heat Exchanger with Corrugated Channels

Seo

Cho²,

Lee

et al. 2015

Entropy

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“…For wavy fin, Wang et al (1997) and did not find any significant effect of the fin pitch on the heat transfer. At lower Reynolds number (Re < 4000), Pirompugd et al (2005Pirompugd et al ( , 2008, and Cheng et al (2009) found that the heat transfer was higher for the smaller fin pitch (1.2 ≤ f p ≤ 3.5), and the reason was believed to be the laminar flow and suppressing of the vortex region behind the tube at smaller fin pitch [similar to the ]. Tao et al (2011a) found a maxima in the heat transfer for a fin pitch of 1.2 ≤ f p ≤ 2 mm.…”

Section: Fin Pitchmentioning

confidence: 89%

“…Pirompugd et al (2008) applied the same method on the wavy-finnedtube heat exchanger for a range of 500 ≤ Re ≤ 5000. The results were almost similar to the results obtained for the plain fin by Pirompugd et al (2007a, b).…”

Section: Plate Finsmentioning

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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“…Therefore, the airside heat and mass transfer characteristics of finned-tube heat exchangers have been extensively studied [1][2][3][4][5][6][7][8][9][10] to better optimize the structural parameters, including the fin materials, fin pitch, tube diameters and tube arrangements. There have been many experimental studies [8][9][10][11][12][13][14][15][16][17] of these factors for specific heat exchangers [7] to enhance the heat transfer [18,19] and improve the fin efficiency.…”

Section: Introductionmentioning

confidence: 99%

Airside fin efficiencies for finned-tube heat exchangers with forced convection

Cheng

Zhang

2011

Sci. China Technol. Sci.

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The heat transfer and mass transfer fin efficiencies were analyzed numerically to show that popular models for heat transfer fin efficiency for circular fins are not always reasonable. The numerical results show that the effective heat transfer area of a circular fin increases several times faster than that of a straight fin for the same tube radius. Then, a simple but accurate heat transfer fin efficiency model was developed and verified by numerical results for a wide range of fin designs. This model predicts the heat transfer fin efficiency with absolute errors of less than 1%. The heat transfer and mass transfer fin efficiencies were found to be quite different for typical air flow with low relative humidity. Thus, these two fin efficiencies should not be assumed to be equal and a mass transfer fin efficiency model was developed, based on the heat transfer fin efficiency model. These heat transfer and mass transfer fin efficiencies are very useful for more accurate prediction for a wide range of practical applications. circular fin efficiency, heat transfer, mass transfer, humid air condensation Citation:Li C, Li J M, Zhang H R. Airside fin efficiencies for finned-tube heat exchangers with forced convection.

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Finite circular fin method for wavy fin-and-tube heat exchangers under fully and partially wet surface conditions

Cited by 22 publications

References 23 publications

Thermal Characteristics of a Primary Surface Heat Exchanger with Corrugated Channels

Thermal Characteristics of a Primary Surface Heat Exchanger with Corrugated Channels

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

Airside fin efficiencies for finned-tube heat exchangers with forced convection

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