A two-dimensional fin efficiency analysis of combined heat and mass transfer in elliptic fins

Lin, Chien Nan; Jang, Ji Yeon

doi:10.1016/s0017-9310(02)00086-8

Cited by 62 publications

(24 citation statements)

References 13 publications

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“…The most widely operated heat exchangers make use of fin-and-tube configuration in association with the application of heating, ventilating, air-conditioning and refrigeration systems. With regard to the fin temperature and dew point temperature of surrounding air, three situations on a fin surface can be distinguished [1]. The fin surface is fully dry if the temperature of the whole fin is higher than the air dew point temperature.…”

Section: List Of Symbols C Pamentioning

confidence: 99%

“…As mentioned earlier, the sensible heat transfer coefficient is often assumed uniform. Thus, the wet fin efficiency is usually determined under this assumption and by introducing a functional relation between the relative humidity and the fin temperature [1,2,[7][8][9][10]. The most proposed relation between ''the difference of the air humidity ratio and that evaluated at the fin temperature'' and ''the difference of the ambient temperature and fin temperature'' used a factor named the condensation factor.…”

Section: List Of Symbols C Pamentioning

confidence: 99%

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Numerical analysis of heat and mass transfer in a compact finned tubes air heat exchanger under dehumidification conditions

Benelmir¹,

Mokraoui²

2011

Heat Mass Transfer

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A simulation model of a fin-and-tube heat exchanger is presented. The effect of the relative humidity, air speed, fin base temperature, and inlet air temperature on the estimation of the overall heat-transfer coefficient and fin efficiency under wet conditions is also investigated. This model considers a non-uniform airflow velocity as well as a variable sensible heat transfer coefficient. List of symbols c p,aMoist air specific heat at constant pressure, J kg -1 K -1 C Condensation factor, K -1 d Thermal diffusivity of vapor in air, m 2 s -1 D Specific diffusion coefficient of vapor in air, m 2 s -1 D t External tube diameter, m D h Hydraulic diameter, m _ E Energy flow rate, W g Acceleration of gravity, m s -2 h Half fin height, m i Specific enthalpy, J kg -1 j Colburn factor for the heat transfer l Half fin length, m Le Lewis number Lv Latent heat of vaporization, J kg -1 m 00 Flux mass density, kg m -2 s -1 _ m Mass flow rate, kg s -1 Nu Nusselt number P f Half fin spacing, m P l Longitudinal tube pitch, m P t Transverse tube pitch, m PrPrandtl number Q t,id ; Q t,r Heat flux for ideal and real fin, W q 00 t

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Section: List Of Symbols C Pamentioning

confidence: 99%

Section: List Of Symbols C Pamentioning

confidence: 99%

Numerical analysis of heat and mass transfer in a compact finned tubes air heat exchanger under dehumidification conditions

Benelmir¹,

Mokraoui²

2011

Heat Mass Transfer

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“…The results reveal that as the slope increases the heat loss decreases and maximum observed the heat loss is for rectangular fins. Lin and Jang (2002) presented the analysis an elliptic fin under the dry, partially wet and fully wet conditions for a range of value for axis ratios, Biot numbers, and air humidifies. It is shown that the fin efficiencies increase as the axis ratio is increased for a particular axis ratio, the efficiency decreases with decrease in fin height or increase in Biot number.…”

Section: Introductionmentioning

confidence: 99%

Performance of Orthotropic Annular Fins Having Contact Resistance

Aasi¹,

Gaba²,

Tiwari³

et al. 2017

Frontiers in Heat and Mass Transfer

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Due to low density and low coefficient of thermal expansion, orthotropic materials, namely, the polymer matrix composites are finding their way in many of the engineering application. The present study investigates the performance of the orthotropic annular fin. The thermal conductivity along radial and axial direction is governed by the thermal conductivity ratio (K), which is an important parameter for orthotropic annular fin. The work then numerically examines in two dimensions, the thermal performance of the annular fin at different thermal conductivity ratio (K) for the rectangular profile using the finite difference method. Different convective heat transfer coefficient are considered at the fin sides and the fin tip. The effect of various parameters such as axial Biot number (Bis), contact Biot number (Bic), tip Biot number (Bie), aspect ratio (b/a), thermal conductivity ratio (K) on the efficiency (Η) and temperature distribution over the fin surface are presented.

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“…An equivalent convection heat transfer term for fully wet conditions was added to impact the heat transfer, owing to the condensation latent heat. There have been few analyses of the fin efficiency for fully wet conditions, though there have been many studies [22][23][24][25][26][27][28][29] turning to the fin efficiency values. Some design manuals [12] and many experimental studies [24] have used the Schmidt model for dry conditions and the McQuiston model [12,13] for fully wet conditions.…”

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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A two-dimensional fin efficiency analysis of combined heat and mass transfer in elliptic fins

Cited by 62 publications

References 13 publications

Numerical analysis of heat and mass transfer in a compact finned tubes air heat exchanger under dehumidification conditions

Numerical analysis of heat and mass transfer in a compact finned tubes air heat exchanger under dehumidification conditions

Performance of Orthotropic Annular Fins Having Contact Resistance

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

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