The combined effects of wall longitudinal heat conduction and inlet fluid flow maldistribution in crossflow plate-fin heat exchangers

Ranganayakulu, C.; Seetharamu, K. N.

doi:10.1007/s002310050392

Cited by 29 publications

(17 citation statements)

References 7 publications

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“…The magnitude of the flow maldistribution is correlated in terms of the number of holes (N ) between the two headers. The correlations are given as I = 10.4/(N ) 0.49 For the range 1 N 7 (16) = 34.5/(N ) 0.54 For the range 1 N 7…”

Section: Correlations Of Flow Maldistributionmentioning

confidence: 99%

See 1 more Smart Citation

Correlations of flow maldistribution parameters in an air cooled heat exchanger

Habib¹,

Ben‐Mansour²,

Said³

et al. 2007

Numerical Methods in Fluids

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SUMMARYThe present paper provides correlations of flow maldistribution parameters in air-cooled heat exchangers. The flow field in the inlet header was obtained through the numerical solution of the governing partial differential equations including the conservation equations of mass and momentum in addition to the equations of the turbulence model. The results were obtained for different number of nozzles of 2-4, different inlet flow velocities of 1-2.5 m/s and different nozzle geometries in addition to incorporation of a second header. The results are presented in terms of mass flow rate distributions in the tubes of the heat exchanger and their standard deviations. The results indicate that the inlet flow velocity has insignificant influence on maldistribution while the nozzle geometry shape has a slight effect. Also, the results indicate that reducing the nozzle diameter results in an increase in the flow maldistribution. A 25% increase is obtained in the standard deviation as a result of decreasing the diameter by 25%. Increasing the number of nozzles has a significant influence on the maldistribution. A reduction of 62.5% in the standard deviation of the mass flow rate inside the tubes is achieved by increasing the number of nozzles from 2 to 4. The results indicate that incorporating a second header results in a significant reduction in the flow maldistribution. A 50% decrease in the standard deviation is achieved as a result of incorporation of a second header of seven holes. It is also found that the hole-diameter distribution at the exit of the second header has a slight influence on the flow maldistribution. Correlations of the flow maldistribution in terms of the investigated parameters are presented.

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Section: Correlations Of Flow Maldistributionmentioning

confidence: 99%

“…An analysis of a cross-flow plate-fin compact heat exchanger was carried out [16] using a finite-element method. The analysis accounts for the combined effect of two-dimensional longitudinal heat conduction through the exchanger wall and non-uniform inlet fluid-flow distribution on both hot and cold fluid sides.…”

Section: Introductionmentioning

confidence: 99%

Correlations of flow maldistribution parameters in an air cooled heat exchanger

Habib¹,

Ben‐Mansour²,

Said³

et al. 2007

Numerical Methods in Fluids

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show abstract

“…An analysis of a crossflow plate-fin compact heat exchanger was carried out by Ranganayakulu and Seetharamu [20] using a finite element method. The analysis accounts for the combined effect of two-dimensional longitudinal heat conduction through the exchanger wall and non-uniform inlet fluid flow distribution on both hot and cold fluid sides.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of flow maldistribution in air-cooled heat exchangers

et al. 2009

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“…They showed that, for plate-fin heat exchangers made of aluminum, the influence of the lateral heat conduction resistance of fins on the flow temperature and flow maldistribution is insignificant and they attributed this to the high fin efficiency. Ranganayakulu and Seetharamu [7] carried out a study, using a finite element method, on a plate fin, compact and cross-flow heat exchanger, considering the influences of both the exchanger wall and non-uniform inlet fluid flow distribution on both hot and cold fluid sides and the two-dimensional longitudinal heat conduction. Using a finite element code, the mathematical equations were solved for different types of inlet flow and temperature maldistributions.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Flow Maldistribution Inside an Air-Cooled Heat Exchanger

et al. 2014

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Flow maldistribution in heat exchanger tubes can significantly affect its performance. In this work, 16 tubes are connected between the inlet and the exit headers forming the heat exchanger. The feed nozzle is connected to the inlet header, and its connection point can be altered. The influences of inlet flow Reynolds number, nozzle diameter, number of nozzles and nozzle location on the flow maldistribution are experimentally investigated. Water is chosen to be the working fluid inside the heat exchanger set of tubes. At lower flow rates, the results showed that the flow Reynolds number has a significant effect on the flow maldistribution inside the heat exchanger set of tubes; however, at higher flow rates, this effect was insignificant. Locating the nozzle at the center of the inlet header resulted in about 25-30 % reduction in the standard deviation (STD) of the flow rate inside the tubes. Increasing the number of inlet nozzles resulted in an insignificant effect on the flow maldistribution. Increasing the nozzle diameter resulted in increased STD of the flow rate distribution among the tubes and pressure drop across the tubes at the considered heat exchanger geometry and water flow rate.

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The combined effects of wall longitudinal heat conduction and inlet fluid flow maldistribution in crossflow plate-fin heat exchangers

Cited by 29 publications

References 7 publications

Correlations of flow maldistribution parameters in an air cooled heat exchanger

Correlations of flow maldistribution parameters in an air cooled heat exchanger

Evaluation of flow maldistribution in air-cooled heat exchangers

Experimental Investigation of the Flow Maldistribution Inside an Air-Cooled Heat Exchanger

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