The Efficiency of Composite Fins

Barker, James J.

doi:10.13182/nse58-a25469

Cited by 17 publications

(13 citation statements)

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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. Therefore, accurate calculation of the convection heat transfer coefficients, using the heat transfer equation, h=q/( t t), requires precise measurement of the temperature difference and heat flux and the precise predictions of 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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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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“…To overcome this di$culty, copper is protected and strengthened by a sheath of stainless steel which has a thermal conductivity lower than that of copper. Such a con"guration has been studied by Barker (1958), Chu et al (1983) and Ghoshdastidar and Mukhopadhyay (1989). Barker (1958) considered two-dimensional heat #ow for the "n and its coating to obtain the "n e$ciency of composite "ns.…”

Section: Introductionmentioning

confidence: 99%

“…Such a con"guration has been studied by Barker (1958), Chu et al (1983) and Ghoshdastidar and Mukhopadhyay (1989). Barker (1958) considered two-dimensional heat #ow for the "n and its coating to obtain the "n e$ciency of composite "ns. Barker also obtained analytically an expression for the steady-state temperature distribution within the two materials.…”

Section: Introductionmentioning

confidence: 99%

“…The complex closed-form solutions of Barker (1958) and Chu et al (1983) would be reduced and a more simple analytical solution could be obtained if a one-dimensional heat conduction is assumed within the clad. The assumption of one-dimensional heat conduction within the clad is quite suitable since it has a relatively small thickness compared to other dimensions.…”

Section: Introductionmentioning

confidence: 99%

“…In spite of the e!ort reported by Barker (1958), Chu et al (1983), Feijoo et al (1979) and Zubair and Shamsher (1991) to obtain the analytical expressions either for the steady or the transient temperature distribution, the analytical methods used had the inherent disadvantage of producing solutions that are too cumbersome to use. Using numerical methods as a direct way to evaluate the temperature distribution in a two-dimensional "n, Ghoshdastidar and Mukhopadhyay (1989) considered two-dimensional heat #ow in the "n and its coating.…”

Section: Introductionmentioning

confidence: 99%

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A spreadsheet solution of transient conduction in composite fins

Mokheimer

Antar

Farooqi

et al. 2002

Int. J. Energy Res.

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SUMMARYTransient heat transfer through composite "ns is investigated by numerical methods. In this regard, governing di!erential equations of the two-dimensional "n and one-dimensional cladding are studied to examine the e!ect of Biot number and ratio of thermal conductivities of the "n material to the cladding, on the dimensionless temperature pro"les. In addition, the use of spreadsheet programs in solving the composite "n problems is investigated in somewhat more detail with regard to the solution as well as presentation of the graphical results. The results show that one-dimensional analysis, traditionally used in "n analysis, is not applicable for composite "ns, particularly when the conductivity ratio of the composite "n materials is very high.

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